Shenzhen Alu Rapid Prototype Precision Co., Ltd.
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Press Fit and Slip Fit Design Guide: Interference, Clearance, Tolerances and Assembly
The difference between a reliable assembly and a part that seizes, rattles or cracks can be only a few hundredths of a millimeter. Press fits and slip fits look simple because they involve one part entering another, but their performance depends on the complete tolerance relationship between both features, their geometry, materials, surface finish, temperature and assembly method.
A designer should not specify a shaft diameter and hole diameter independently and hope that the result will “fit.” The limits must be analyzed together. A nominal clearance can become interference at worst-case limits. A press fit that works in aluminum may be too severe in brittle plastic. An anodized bore may close enough to prevent assembly. A thin hub can expand or split while a thick hub survives the same interference.
This guide explains clearance, transition and interference fits; how to calculate worst-case conditions; how material, temperature and coatings change the result; and how to design, manufacture, inspect and validate press-fit and slip-fit assemblies.
Quick Answer: What Is the Difference Between a Press Fit and a Slip Fit?
A slip fit has positive clearance between mating features. The shaft, pin, bearing or insert can normally be assembled by hand or with light force. The amount of clearance determines whether the joint locates accurately, slides freely or has noticeable play.
A press fit has intentional interference. The inserted feature is larger than the receiving hole at assembly condition. Force, heat, cooling or a combination is used to assemble the parts. Elastic deformation creates contact pressure that resists movement.
A transition fit can produce either slight clearance or slight interference depending on actual part sizes. It is useful for accurate location when assembly method and service loads can tolerate the variation.
The correct fit cannot be chosen from a label alone. Define the functional purpose, analyze limit dimensions and validate the complete assembly under production conditions.
Basic Fit Terms
Nominal size
The nominal size is the common reference dimension, such as a 10 mm shaft and 10 mm bore. It does not show the actual clearance or interference.
Actual size
The actual measured size of a specific feature after manufacturing and finishing.
Upper and lower limits
The maximum and minimum acceptable sizes allowed by the drawing.
Allowance
Allowance is the intentional difference between mating features at maximum material condition. Depending on the convention, it represents the minimum clearance or maximum interference.
Clearance
Clearance exists when the hole is larger than the shaft.
Clearance = hole size − shaft size
Interference
Interference exists when the shaft or insert is larger than the hole.
Interference = shaft size − hole size
Tolerance
Tolerance is the permitted variation in a dimension. Both parts contribute to the final fit variation.
Clearance, Transition and Interference Fits
Clearance fit
Every acceptable combination produces positive clearance. Clearance fits are used for sliding, rotation, removable covers, alignment pins that must insert freely and assemblies with contamination or temperature variation.
Transition fit
Some acceptable combinations have clearance while others have interference. Transition fits provide accurate location but may assemble by hand in one case and require tapping or pressing in another.
Interference fit
Every acceptable combination produces interference. Interference fits retain bearings, bushings, dowels, gears, hubs and inserts without separate fasteners when the joint is designed correctly.
The three categories describe dimensional relationships. They do not guarantee a particular hand feel, torque capacity or press force.
Start With the Function of the Joint
Before selecting limits, define what the interface must do.
Questions include:
Must the parts slide repeatedly or assemble only once?
Is accurate concentricity required?
Does the joint transmit torque or axial load?
Must one component be replaceable?
Will the assembly see vibration or impact?
What temperatures and environments are expected?
Can lubricant, adhesive or a retaining compound be used?
Is the receiving wall thick enough for interference?
What assembly equipment is available?
How will the parts be inspected and matched?
A locating dowel, rotating journal, removable pin and permanent bearing seat may share a nominal diameter but need very different fits.
Worst-Case Clearance Calculation
For a shaft entering a hole, calculate both extremes.
Minimum clearance = minimum hole − maximum shaft
Maximum clearance = maximum hole − minimum shaft
Example:
Hole limits: 10.020 to 10.040 mm.
Shaft limits: 9.980 to 10.000 mm.
Minimum clearance is 10.020 − 10.000 = 0.020 mm.
Maximum clearance is 10.040 − 9.980 = 0.060 mm.
The assembly is always a clearance fit, but its play can vary by a factor of three. If location accuracy depends on the fit, the maximum clearance may be more important than the nominal value.
Worst-Case Interference Calculation
For an interference fit:
Minimum interference = minimum shaft − maximum hole
Maximum interference = maximum shaft − minimum hole
Example:
Hole limits: 19.970 to 19.990 mm.
Insert limits: 20.010 to 20.030 mm.
Minimum interference is 20.010 − 19.990 = 0.020 mm.
Maximum interference is 20.030 − 19.970 = 0.060 mm.
The designer must verify that 0.020 mm provides enough retention and that 0.060 mm does not create excessive assembly force, permanent deformation or cracking.
Why Nominal Dimensions Are Not Enough
A drawing that calls out both features as 10.00 mm without limits does not define the fit. General tolerances may apply, but the resulting combination may cross from clearance to interference.
Similarly, specifying “0.02 mm interference” without separate part limits leaves open questions:
Is 0.02 mm the nominal, minimum or maximum?
Does it apply before or after coating?
At what temperature?
Is it diametral or radial interference?
Which feature controls location?
Put complete limits on the drawing or reference a recognized fit system with the nominal size and tolerance class.
Hole-Basis and Shaft-Basis Systems
In a hole-basis system, the hole uses a standard tolerance position and different shaft limits create different fits. This is common because standard drills, reamers, boring tools and gauges make consistent holes economically.
In a shaft-basis system, the shaft uses a standard tolerance position and hole limits change to create the required fit. It can be useful when the shaft comes from standard bar, a purchased component or a process that is difficult to vary.
Choose the basis that matches manufacturing and purchasing realities. If a bearing, dowel or motor shaft is a standard purchased item, design the mating bore around its actual specification rather than assigning a convenient but unavailable size.
Standard Fit Classes
International and national standards provide tolerance classes for common hole and shaft fits. They help communicate a proven relationship, but they still require correct use.
When referencing a standard:
State the standard and edition if contractually important.
Include the nominal diameter range.
Identify hole and shaft classes clearly.
Confirm whether the supplier works in metric or inch conventions.
Check the actual numerical limits on the drawing.
Verify that the class suits material and wall geometry.
A standard interference class intended for a rigid steel hub may be too aggressive for a thin aluminum or plastic component.
Diametral Versus Radial Interference
For cylindrical parts, interference is commonly expressed as the difference in diameters. Radial interference is half the diametral value.
Confusing the two doubles or halves the intended condition. State the convention explicitly in calculations and reports. Drawings normally control diameters, while structural equations may use radial displacement.
Material Stiffness and Strength
Interference causes both parts to deform. The contact pressure depends on geometry and elastic properties.
Steel into steel
Steel components are relatively stiff and can generate high contact pressure from small interference. Tool marks, misalignment and limited lead-in can create very high insertion force.
Steel into aluminum
The aluminum bore expands more easily and may yield at high interference. The joint can be effective, but wall thickness, alloy, temper and temperature must be reviewed.
Metal into plastic
Plastics have lower stiffness and may creep, relax or crack. Humidity and temperature can change size and properties. Knurled or barbed inserts may use localized deformation rather than a smooth classical press fit.
Ceramic or brittle materials
Brittle hubs tolerate limited tensile stress. Press fitting requires specialized analysis, compliant layers or alternative retention methods.
Use actual elastic modulus, yield behavior, Poisson's ratio and temperature condition for critical calculations.
Hub Wall Thickness and Geometry
A thick hub resists expansion and generates higher contact pressure than a thin ring under the same interference. Thin walls may stretch permanently, become oval or crack at nearby features.
Review:
Outside diameter around the bore.
Distance to edges, slots and fastener holes.
Wall thickness variation.
Boss and rib support.
Split lines or relief cuts.
Sharp corners and stress concentrations.
Material grain or print orientation.
Do not apply a handbook interference value without checking the receiving geometry. Finite-element analysis may be useful for thin, asymmetric or high-load hubs.
Engagement Length
Longer engagement increases contact area and potential retention, but also increases insertion force and sensitivity to straightness, taper and misalignment.
An overly long press fit can gall or seize before reaching the final position. A short fit may rock or carry insufficient torque.
Define:
Effective contact length.
Required final position.
Lead-in and relief lengths.
Whether adhesive distributes load.
Whether the press force can be supported throughout the stroke.
For slip fits, long engagement can bind even with positive calculated clearance if straightness and coaxiality are not controlled.
Surface Finish and Waviness
Two features can meet size tolerance and still assemble differently because surface texture affects actual contact.
Rough peaks may be flattened during pressing, lowering final retention. Deep tool marks can scrape material and create debris. Circumferential grooves may affect sealing, while axial marks can create leak paths.
Specify surface roughness only where it supports function. Also control:
Waviness.
Taper.
Lobing.
Burrs.
Tool lead.
Coating texture.
An average roughness value does not describe all of these conditions.
Roundness, Cylindricity and Straightness
Size limits alone allow form error. A bore can measure within limits at several points while being oval or tapered enough to jam a pin. A shaft can have lobing that fools a two-point measurement.
For precise fits, consider:
Roundness of each cross-section.
Cylindricity over the full length.
Straightness of the axis or surface.
Coaxiality or position relative to assembly datums.
Perpendicularity of the entry face.
Use geometric controls only to the extent required. Tight form tolerances add manufacturing and inspection cost but may be essential for long or high-speed fits.
Lead-In Chamfers and Edge Breaks
A press-fit part should not enter with two sharp square edges colliding. A controlled chamfer or radius helps center the parts and reduces shaving.
Good lead-in design considers:
Chamfer diameter and angle.
Burr-free edge condition.
Sufficient pilot engagement before interference begins.
Protection of seals and coatings.
Available axial space.
A large chamfer reduces effective engagement length. A tiny decorative edge break may be inadequate for a high-force assembly. Show the lead-in on both mating parts when needed.
Assembly Alignment
Misalignment concentrates load on one edge and can score the shaft, bell-mouth the bore or bend the component. The assembly fixture should keep axes aligned before contact.
Helpful features include:
Pilot diameters.
Long approach guides.
Flat support under the receiving component.
Fixtures that contact functional datums.
Press tooling with spherical compensation where appropriate.
Force and displacement monitoring.
Do not press against a thin cover, unsupported flange or delicate bearing race.
Estimating Press Force
Press force depends on contact pressure, diameter, engagement length, friction, lubrication, surface condition and lead-in. Analytical equations provide an estimate, but real force can vary significantly.
The process plan should define:
Expected force range.
Maximum equipment capacity.
Force at seating.
Press speed.
Lubricant condition.
Support fixture.
Stop position.
Reject response.
A force-displacement curve is often more useful than one peak value. It can reveal early misalignment, unexpected friction, missing components and incomplete seating.
Force-Displacement Monitoring
During controlled pressing, record force against ram position. A good trace typically shows entry, progressive engagement and final seating behavior.
Abnormal patterns may indicate:
Force rises too early: misalignment or oversized insert.
Force is too low: insufficient interference, wrong part or lubricant excess.
Sudden drop: cracking, shaving or component failure.
Irregular spikes: galling or debris.
Final position reached with low force: missing shoulder contact or wrong stack.
Set acceptance windows using validated good assemblies, not arbitrary machine percentages.
Thermal Assembly: Heating and Cooling
Temperature can create temporary assembly clearance. Heating the hub expands its bore; cooling the shaft or insert contracts it.
Thermal assembly reduces press force and surface damage, but requires control:
Maximum safe component temperature.
Minimum safe cooling temperature.
Temperature uniformity.
Transfer time before dimensions recover.
Condensation and corrosion.
Operator safety.
Material heat-treatment limits.
Effects on seals, adhesives and electronics.
Calculate thermal growth using the material's coefficient of thermal expansion and actual temperature change. Dissimilar materials may continue changing relative fit in service.
Differential Thermal Expansion in Service
An aluminum housing expands more than a steel bearing for the same temperature rise. A press fit that is secure at room temperature may loosen when hot. Conversely, a steel insert in a plastic component may create greater stress when cold.
Evaluate the minimum and maximum operating temperatures:
Calculate each mating diameter at temperature.
Recalculate clearance or interference.
Include material property changes.
Consider transient gradients, not only uniform temperature.
Verify retention and stress at both extremes.
Thermal cycling can also cause fretting or creep even when static limits appear acceptable.
Coatings, Plating and Anodizing
Finishes change dimensions. A coating on a shaft increases its diameter. A coating inside a bore reduces the opening. Some conversion processes grow inward and outward, while material removal before coating also matters.
The drawing should state:
Whether fit dimensions apply before or after finish.
Which surfaces are coated or masked.
Expected thickness range.
Whether thickness is per surface.
Required post-finish inspection.
Whether coating may be damaged during assembly.
Anodizing, plating, paint and powder coating should never be treated as dimensionally zero for a close fit.
Adhesives and Retaining Compounds
Adhesives can supplement or replace mechanical interference. They can fill small gaps, seal interfaces and reduce the required press force.
Design factors include:
Permitted gap range.
Surface preparation.
Cure time and temperature.
Material compatibility.
Service temperature and chemicals.
Required disassembly.
Cleanliness and dispensing control.
A retaining compound needs space and access. A very tight press may scrape away adhesive before assembly. Follow the product's validated gap and cure guidance.
Knurls, Barbs and Serrated Inserts
Plastic and soft-metal assemblies often use knurled, barbed or grooved inserts. Retention comes from local material displacement and mechanical interlock rather than a uniform smooth contact pressure.
Review:
Insert outside profile.
Pilot-hole diameter.
Material flow volume.
Wall thickness around the insert.
Installation direction and speed.
Pull-out and torque requirements.
Risk of cracks or sink marks.
Heat staking, ultrasonic installation or molded-in inserts may be better than cold pressing for some plastics.
Bearing Fits
Bearing rings require special care. The ring under rotating load usually needs sufficient retention to prevent creep, while the other ring may need a different fit for assembly and thermal behavior.
Avoid transmitting press force through rolling elements. Support the ring being fitted directly. Control shoulder perpendicularity, seat diameter, surface finish and fillet clearance.
Use bearing-manufacturer guidance for the load, size, housing, shaft and temperature. A generic press-fit table does not replace bearing-specific selection.
Dowel Pins and Locating Fits
Dowel pins locate components precisely. Common strategies include:
Press the pin into one component and use a slip fit in the mating part.
Use one round pin and one relieved or diamond pin to avoid overconstraint.
Ream holes in assembly for very close alignment.
Use removable pull dowels for service.
Two tightly located round pins can bind if hole spacing tolerances accumulate. A diamond pin constrains one direction while allowing relief in the other.
Bushings and Sleeves
A bushing press fit must retain the bushing without shrinking its internal diameter beyond function. Thin-wall bushings can change size substantially after installation.
Plan:
Outside interference.
Housing wall thickness.
Bushing material and split condition.
Internal diameter after pressing.
Lubrication grooves.
Final reaming or honing.
Removal and replacement method.
Inspect the installed bore, not only the loose bushing.
Pins in Plastic Parts
Plastic dimensions change with molding shrinkage, moisture and temperature. A metal pin pressed into a plastic boss may cause immediate stress whitening or delayed cracking.
Consider:
Resin type and reinforcement.
Moisture conditioning.
Molded boss knit lines.
Draft and core-pin variation.
Creep and stress relaxation.
Installation temperature.
Boss outside diameter and ribs.
Prototype the production material and molded geometry. A machined plastic sample may not reproduce molded fiber orientation or weld lines.
Slip Fits for Sliding and Rotation
A slip fit can mean anything from accurate hand location to free running with contamination. Define the actual behavior.
Locational slip fit
Small clearance limits play while allowing manual assembly. Sensitive to burrs, dirt and coating.
Sliding fit
Allows controlled axial movement. Surface finish, straightness and lubrication matter over the engagement length.
Running fit
Allows continuous rotation with lubricant, speed and temperature considerations. It is a bearing design problem, not only a dimensional gap.
Loose fit
Provides generous clearance for easy assembly, thermal change, dirt or noncritical alignment.
State load, speed, duty cycle and environment when motion is involved.
Clearance for Dirt, Lubricant and Environment
The clean-room fit that works on a bench may seize in dust, chips, paint or corrosion. Clearance should account for realistic contamination and surface change.
Review:
Particle size.
Lubricant film.
Corrosion products.
Ice or moisture.
Cleaning residue.
Paint overspray.
Wear debris.
Seals, wipers, grooves or protective covers may control contamination more effectively than simply increasing clearance.
Tolerance Stack-Up Beyond the Diameter
Assembly fit also depends on position, orientation and surrounding geometry. A pin can fit its hole individually but fail when two hole patterns are misaligned.
Analyze:
Hole-to-hole spacing.
True position relative to datums.
Coaxiality of stepped bores.
Perpendicularity of shoulders.
Flatness of mating faces.
Chamfer location.
Accumulated coating.
Use functional gauges or mating-part checks for multi-feature interfaces when appropriate.
Manufacturing Processes for Precision Fits
Drilling and reaming
Reaming improves hole size and finish after drilling. Allow suitable stock and avoid interrupted cuts where possible.
Boring
Boring can control size, straightness and position in rigid setups. It suits larger or precision bores.
Grinding and honing
Grinding and honing provide tight size, form and finish for high-precision shafts and bores.
Turning
Precision turning can produce shafts and bores efficiently, but tool wear, heat and chucking affect taper and roundness.
Additive manufacturing
Printed holes often need design allowance and secondary machining for close fits. Surface texture and anisotropy limit direct use for precision press fits.
Choose the process according to tolerance, geometry, material, quantity and inspection needs.
Inspection of Mating Features
Measurement should match the function.
Options include:
Micrometers for external diameters.
Bore gauges for internal diameters.
Air gauges for high-resolution bore comparison.
Plug and ring gauges for limit inspection.
CMM for size, position and geometry.
Roundness instruments for form.
Surface-finish instruments.
Functional assembly gauges.
Measure at multiple axial and angular positions to detect taper and ovality. Calipers alone are usually insufficient for a tight press fit.
Temperature During Inspection
Precision dimensions are normally referenced to a standard temperature. Parts fresh from machining, washing or curing may be warmer or cooler than the inspection room.
For close fits:
Allow parts to stabilize.
Record temperature when significant.
Use calibrated instruments in the same environment.
Avoid warming small parts with prolonged hand contact.
Apply temperature compensation only with controlled data.
The tighter the tolerance and larger the diameter, the more thermal condition matters.
Prototype and Validation Plan
1. Manufacture limit samples
When feasible, test near minimum and maximum interference or clearance rather than only nominal parts.
2. Control surface and finish
Use production-intent roughness, coating and lubrication.
3. Record assembly force
Capture force-displacement curves, temperatures and assembly speed.
4. Inspect after assembly
Measure position, runout, deformation and internal dimensions.
5. Test retention
Perform push-out, pull-out or torque tests appropriate to the joint.
6. Apply service conditions
Test temperature, vibration, impact, fluids and cycling.
7. Disassemble representative samples
Inspect scoring, galling, cracks, coating damage and fretting.
8. Freeze the process
Document part limits, finish, lubricant, fixture, press program and acceptance windows.
Common Press-Fit Failures
Assembly force is too high
Check maximum interference, coating thickness, burrs, misalignment, surface finish, lubrication and temperature.
Retention is too low
Check minimum interference, yielding, roughness flattening, creep, adhesive cure and actual engagement length.
Hub cracks
Check maximum interference, wall thickness, material defects, sharp features, brittle condition and press alignment.
Shaft is scored
Check lead-in, burrs, finish, cleanliness, galling and excessive engagement.
Installed bushing bore is too small
Check housing interference, bushing wall, material and post-installation sizing plan.
Part seats at an angle
Check fixture support, pilot geometry, face perpendicularity and ram alignment.
Joint loosens when hot
Check differential thermal expansion, material relaxation and minimum hot-condition interference.
Common Slip-Fit Failures
Parts will not assemble
Check minimum clearance, burrs, coating, dirt, ovality, taper, position and temperature.
Assembly has too much play
Check maximum clearance, wear allowance, pattern alignment and whether a transition or locating fit is more appropriate.
Sliding part binds mid-stroke
Check straightness, cylindricity, coaxiality, engagement length and contamination.
Fit changes between suppliers
Check whether both suppliers use the same limits, datum method, finish condition and measurement technique.
Design Checklist for Press Fits
Define axial, torque and retention loads.
Set minimum and maximum interference.
Specify whether values are diametral.
Analyze material stiffness and strength.
Check hub wall thickness and nearby features.
Evaluate service temperature extremes.
Include coating and plating thickness.
Define surface finish and form.
Add adequate lead-in geometry.
Plan aligned assembly support.
Estimate force and equipment capacity.
Define lubricant or adhesive.
Inspect the installed condition.
Validate push-out or torque capacity.
Design Checklist for Slip Fits
Define locating, sliding or running purpose.
Set minimum and maximum clearance.
Check play at maximum clearance.
Include thermal growth and contamination.
Control straightness and form for long engagement.
Define lubrication.
Protect against burrs and coating buildup.
Analyze multi-pin pattern stack-up.
Specify inspection temperature.
Validate with mating production parts.
RFQ Information for Parts With Critical Fits
Include the following when requesting a quotation:
3D CAD and controlled 2D drawings for both mating parts.
Part numbers, revisions and quantities.
Complete material grades and conditions.
Hole and shaft limit dimensions.
Referenced fit standard and class, if used.
Surface-finish and geometric requirements.
Coating, plating, anodizing or heat treatment.
Temperature and environment of service.
Assembly method and available equipment.
Lubricant, adhesive or retaining compound.
Required insertion-force window.
Pull-out, push-out or torque requirement.
Inspection report and gauge requirements.
Mating samples or purchased-component specifications.
Packaging that protects precision surfaces.
Provide the mating component specification even if the supplier manufactures only one side of the fit. Without it, the functional tolerance cannot be evaluated completely.
Questions to Ask a Manufacturing Supplier
What process will produce the hole and shaft limits?
Are limits applied before or after finishing?
How will roundness, taper and surface finish be controlled?
What instruments or gauges will inspect the features?
Will parts be temperature-stabilized before measurement?
Can the supplier analyze worst-case clearance or interference?
What press force and assembly fixture are recommended?
Can force-displacement data be recorded?
How will coatings be masked or compensated?
Is post-assembly inspection available?
Can limit samples or capability data be supplied?
How are precision surfaces protected during shipping?
Frequently Asked Questions
How much clearance does a slip fit need?
There is no universal value. Required clearance depends on diameter, engagement length, accuracy, motion, temperature, contamination and manufacturing capability. Calculate both minimum and maximum clearance from complete part limits.
How much interference should a press fit have?
The correct interference depends on diameter, materials, hub geometry, engagement length, load and assembly method. Verify both minimum retention and maximum stress or press force.
Is a press fit stronger with more interference?
Only within a suitable range. More interference increases contact pressure but can cause yielding, cracking, galling, distortion and excessive assembly force. The maximum condition must be analyzed.
Does a chamfer change the press fit?
The chamfer helps alignment and reduces shaving, but it also shortens the full-diameter engagement. Its size and angle should be included in retention calculations.
Should press-fit dimensions be measured before or after coating?
The drawing must state the required final condition. For most functional acceptance, finished dimensions should be controlled after coating unless the fit surfaces are masked.
Can an anodized aluminum bore be used for a press fit?
Yes, but anodizing changes bore size and may crack or scrape under severe interference. Specify masking or final dimensions and validate the assembly process.
Why does a slip-fit pin enter one hole but not two aligned holes?
The individual sizes may be acceptable while true position, spacing or coaxiality is not. Analyze the full hole pattern and use a relieved second pin when appropriate.
Can a press fit be disassembled?
Some can be pressed apart, but surfaces may be damaged and retention may change on reuse. Design extraction access and define whether components are serviceable.
Does temperature affect a press fit?
Yes. Components expand according to material and temperature. Heating or cooling can assist assembly, and service temperature can tighten or loosen a dissimilar-material joint.
What is the difference between a transition fit and a press fit?
A transition fit may have small clearance or small interference depending on actual sizes. A true interference fit has interference at every acceptable size combination.
Why is a bushing bore smaller after installation?
The housing compresses the bushing during pressing. Thin-wall bushings may need an allowance and final reaming or honing after installation.
Can adhesive replace an interference fit?
Often, a retaining compound can work with a small clearance or reduced interference. The joint must follow the adhesive's gap, surface-preparation, cure and service limits.
Are calipers accurate enough to inspect a press fit?
Usually not for tight fits. Use micrometers, bore gauges, air gauges or calibrated limit gauges appropriate to the tolerance and geometry.
Request a Fit and Tolerance Review
Press fits and slip fits succeed when the two mating parts are treated as one tolerance system. Size limits, form, finish, coatings, material behavior, temperature and assembly process all influence the actual joint. A short worst-case review before manufacturing prevents expensive sorting, force problems and field failures.
Aluprototype provides CNC machining services for precision metal and plastic parts, including shafts, bores, bearing seats, bushings, dowel features and custom assemblies. Use the CNC Machining RFQ Checklist to prepare complete design and quality information.
Send both mating models, drawings, material specifications, finishes, quantities and fit requirements through the request-a-quote page. The engineering team can review tolerance limits, manufacturability, inspection and assembly risk before production.