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Custom CNC Pins for Fit, Location, and Retention

We are a China-based B2B custom manufacturer of drawing-based CNC pins. You send the drawing, CAD file, sample, material, quantity, and mating-part requirements; we review the functional dimensions, quote the project, coordinate production and quality control, then prepare the order for shipment.

REQUEST A CNC PIN QUOTE

REVIEW MY PIN FIT

Buyer concern	What the drawing review checks
Insertion and fit	Pin diameter, mating-hole size, clearance or interference, lead-in, and installation method.
Location accuracy	Functional datum, effective locating length, shoulder position, and relationship between diameters.
Retention	Knurl or groove geometry, host material, thread form, edge condition, and assembly forces.
Repeat production	Critical characteristics, inspection priorities, packaging, and project-specific acceptance needs.

QUOTING FEATURE

Give the Pin Its Assembly Context

An accurate pin quotation starts with the parts it mates with. A nominal diameter alone does not tell us whether the pin should slide, press, locate, pivot, or lock. Send the pin drawing with the mating-hole dimensions, functional role, material, quantity, and any critical fit or surface notes. If the pin has a cross hole, groove, thread, knurl, or multiple diameters, show the datum relationship and usable length.

1. Define the Pin Function

State whether the pin locates, aligns, retains, pivots, guides, connects, or supports a moving part.

2. Identify Functional Geometry

Mark the critical diameter, effective length, shoulders, threads, grooves, cross holes, chamfers, and end shape.

3. Share Mating Conditions

Provide hole size, host material, fit requirement, insertion method, load, motion, and service environment.

4. Agree Inspection Priorities

Clarify the dimensions and reports that matter to assembly, rather than measuring every non-functional feature equally.

1. Define the Pin Function

State whether the pin locates, aligns, retains, pivots, guides, connects, or supports a moving part.
2. Identify Functional Geometry

Mark the critical diameter, effective length, shoulders, threads, grooves, cross holes, chamfers, and end shape.
3. Share Mating Conditions

Provide hole size, host material, fit requirement, insertion method, load, motion, and service environment.
4. Agree Inspection Priorities

Clarify the dimensions and reports that matter to assembly, rather than measuring every non-functional feature equally.

Precision Pins Built Around the Mating Parts

We reviews pin diameter, length, shoulders, grooves, threads, knurls, holes, material, finish, and mating conditions before quotation. This suits prototype and repeat B2B projects where the drawing needs more control than a standard catalog pin can provide.
For cylindrical parts dominated by diameter, bore, and profile features, you can also review CNC Turning Parts.

CNC PIN TYPES

For pins that combine fastening and alignment features, link to CNC Threaded Components.

Dowel and Locating Pins

Stepped and Shoulder Pins

Threaded and Grooved Pins

Pivot and Hinge Pins

WHY WORK WITH US

Reduce Pin-Related Assembly Risk

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Functional Fit Review

Confirm the relationship between pin diameter, mating hole, and required assembly behavior before production.
Feature Relationships
Burr and End Condition
Drawing-Based Quality Plan

CNC Pin Project Reference Values

Turning Feature	Typical Project Reference	Review Requirement
Pin diameter	0.8 to 50 mm	Confirm material, length, feature geometry, and manufacturing route.
Critical diameter	+/-0.01 to +/-0.03 mm	Confirm fit class, measurement method, and mating-hole requirement.
Length / shoulder position	+/-0.05 to +/-0.10 mm	Confirm datum, effective length, and stack-up relationship.
Concentricity / runout	0.02 to 0.05 mm project target	Confirm functional axis, feature relationship, and inspection location.
Surface roughness	Ra 0.8 to 3.2 um	Confirm sliding, press-fit, sealing, wear, or cosmetic requirement.

The values below are project-reference ranges, not unconditional factory guarantees. Final feasibility depends on material, diameter-to-length ratio, geometry, workholding, quantity, finish, inspection method, and the mating assembly. Submit your drawing for confirmation.

Material Type

Material	When It Is Commonly Considered
Aluminum	Lightweight shafts, spacers, housings, collars, and non-heavy-wear assemblies
Stainless Steel	Corrosion-resistant fittings, shafts, pins, sleeves, and exposed mechanical interfaces
Carbon and Alloy Steel	High-strength shafts, pins, drive components, and wear-related mechanical parts
Brass and Bronze	Bushings, fittings, connectors, low-friction interfaces, and corrosion-sensitive components

MATERIALS AND APPLICATIONS

Electrical and Connector Assemblies

Custom contact and connector-style pins may need controlled geometry, conductive material, plating, slots, crimp features, or assembly interfaces. Define the electrical function, mating connector, contact area, material grade, finish, and inspection requirements so mechanical and connection details are considered together.
Industrial Equipment

Pivot, hinge, grooved, and retaining pins connect moving subassemblies in equipment where vibration, load direction, lubrication, and maintenance access matter. Your project review should identify the bearing length, retention method, contact surfaces, and any wear-sensitive dimensions before production.
Automation and Fixtures

Locating, shoulder, and dowel-style pins help establish repeatable positions in jigs, fixtures, grippers, actuators, and automated stations. Send the datum scheme, insertion cycle, load, and replacement requirement so the pin is reviewed as part of the positioning system, not as an isolated rod.
Material and Finish Follow the Pin Function

Steel may suit strength and wear requirements; stainless steel may be considered for corrosion exposure; aluminum can reduce weight; brass or copper alloys may support conductivity or corrosion-related needs; and engineering plastics may suit insulation, noise, or low-friction requirements. Finish selection should follow the duty cycle, mating materials, corrosion environment, contact surface, and assembly method rather than appearance alone.
For related drawing-based components across the same assembly, explore CNC Machined Components.

A Controlled Route from Drawing to Shipment

1. Technical Input

You provide the drawing, CAD file, sample, material, quantity, pin function, and mating-part context.

2. Requirement Review

We clarify fit, critical dimensions, feature relationships, material, finish, and inspection priorities.

3. Quotation Confirmation

The quotation is based on the reviewed project information and open technical points.

4. Production and Quality Control

Production follows the approved drawing and the agreed checks for functional pin characteristics.

5. Packing and Shipment Preparation

Confirm quantity, packing, documentation, and receiving requirements before dispatch.

CNC Pins FAQ

Q Can you support samples before repeat production?

Samples can help you verify fit, insertion, retention, pivot movement, and assembly sequence before repeat production. Share the initial quantity, expected repeat demand, acceptance checks, and any mating parts or gauges needed for a useful project review.

Are standard spring pins or roll pins included?

This page is for custom solid machined pins made to drawings. Standard formed spring pins, roll pins, and stock cotter pins are different product types. If your project needs a custom solid pin with defined geometry, material, fit, or secondary features, send the drawing for review.
How should I define a press-fit pin?

Provide the pin diameter, mating-hole size, host material, desired retention behavior, insertion method, and whether the assembly can tolerate local deformation. A press fit is a system decision: the same pin feature can behave differently in aluminum, steel, plastics, or thin-wall parts.
Can a CNC pin include threads, grooves, or knurling?

Yes. These features can be evaluated from your drawing. Specify thread standard and usable length, groove dimensions and retaining hardware, or knurl pattern, knurled length, host material, and assembly method. This avoids treating a retention feature as a cosmetic detail.
Can you make locating or dowel-style pins?

Yes. For locating pins, provide the required locating diameter, effective locating length, mating-hole tolerance, insertion condition, end form, and any shoulder or mounting feature. The key question is how the pin positions the assembly and whether it must be removable, press-fit, or repeatedly cycled.

Make the Mating Features Clear

Upload your drawing, CAD file, or sample and include the pin function, material, quantity, diameter, length, mating-hole details, fit requirement, secondary features, finish, and inspection needs. We will review the information needed for a drawing-based CNC pin quotation.

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