Overview

Precision plastic positioning components provide accurate mechanical location and guidance while protecting sensitive workpieces from metal-on-metal scratching, galling, and contamination.

Machined from high-performance engineering thermoplastics (POM, PEEK, PA66, and ESD-safe composites), these components offer high dimensional stability, low wear rates, and chemical resistance. They serve as direct alternatives to metal locating pins and bushings in electronics assembly, cleanroom automation, and delicate manufacturing processes where surface marring or particulate generation must be eliminated.

Specifications

Parameter	Standard Specifications	Custom Options
Material Options	POM (Acetal), PEEK, PA66 (Nylon), PTFE, ESD POM, ESD PEEK	Specific grade certifications on request
Dimensional Tolerance	±0.01 mm to ±0.03 mm	Tightened tolerances per drawing
Operating Temperature	-40°C to +120°C (POM); up to +250°C (PEEK)	High-temp formulations available
Surface Resistivity	Insulative (>10¹² Ω) or ESD Safe (10⁶ to 10⁹ Ω)	Anti-static grades for electronics
Standard Diameters	Ø4 mm to Ø50 mm	Metric & Inch dimensions
Compliance	RoHS, REACH, FDA (food-grade POM/PTFE available)	Material Test Reports (MTR) provided

Features

Non-Marring Contact: Prevents scratching, indentation, and wear on aluminum, stainless steel, and painted mating surfaces.

Low Coefficient of Friction: Minimizes stick-slip during high-frequency insertion, indexing, and sliding operations without requiring liquid lubricants.

Electrical Discharge Safety: ESD-grade variants safely dissipate static charges, protecting sensitive semiconductor dies and PCB assemblies.

Corrosion Resistance: Inert to industrial coolants, cutting fluids, alcohol, and mild chemical washdowns.

Weight Reduction: Significantly lighter than steel or brass equivalents, reducing inertial mass in high-speed pick-and-place gantry systems.

Materials & Manufacturing

Material selection dictates performance in precision tooling. We process engineering plastics sourced from certified resin compounders (e.g., Ensinger, Quadrant/Mitsubishi Chemical, Victrex).

Material Grades & Selection Matrix:
POM-C (Acetal): Standard for general machining jigs; high rigidity, low moisture absorption, excellent dimensional stability.

PEEK: Specified for high-temperature environments (continuous use up to 250°C) and extreme chemical or radiation resistance.

ESD POM / ESD PEEK: Carbon-fiber or additive-filled compounds providing permanent surface resistivity for electrostatic discharge control.

In-House Manufacturing Capabilities:
CNC Turning & Milling: Multi-axis CNC Swiss-type lathes and machining centers maintain tight diametral and positional tolerances (±0.01 mm).

Stress-Relief Annealing: Controlled thermal post-processing eliminates internal machining stresses, preventing post-machining warping or dimensional drift.

Applications

Electronics & Semiconductor Assembly: PCB assembly jigs, carrier plates, and test socket alignment pins utilizing ESD-safe materials.

Automotive Interior Fixtures: Assembly checking fixtures where plastic locating pins prevent scratching of high-gloss plastic dashboards and trim.

Medical Device Manufacturing: Cleanroom assembly nests and packaging guides compliant with FDA/USP Class VI material standards.

General Automation & Robotics: End-of-arm tooling (EOAT) locators, sliding guide blocks, and indexing stops.

Customization

Standard off-the-shelf components rarely fit specialized mechanical designs. We support fully custom manufacturing based on your CAD models and engineering drawings.

Custom Geometries: Non-standard step diameters, extended shanks, integrated mounting threads, and complex keyways.

Dimensional Modification: Tailored pin lengths, custom shoulder heights, and modified radii to match existing mating holes.

Traceability & Marking: Laser-engraved part numbers, cavity IDs, or company logos directly on component flanges.

Prototyping to Mass Production: Rapid prototyping via CNC machining (MOQ: 10 pcs) scaling smoothly to high-volume injection molding.

Quality Control

Reliable positioning requires strict lot-to-lot consistency. Our inspection protocol verifies every production batch before shipment.

Inspection Equipment:
2.5D Optical Video Measuring Systems (VMS): For non-contact profile and contour verification.

Digital micrometer arrays and pin gauges: Calibrated to national standards.

Surface roughness testers (Ra): For sliding contact areas.

Testing Scope:
First Article Inspection (FAI) reports: Supplied with initial sample runs.

Dimensional compliance reports: Per drawing characteristics.

Raw material lot certificate and RoHS/REACH verification: Provided upon request.

FAQ

Q: How do I choose between POM and PEEK for positioning pins?

A: Choose POM for standard automation jigs operating below 100°C with good dimensional stability and lower cost. Choose PEEK if your application involves continuous temperatures above 150°C, high load-bearing requirements, or aggressive chemical cleaning agents.

Q: Do these plastic components require external lubrication?

A: No. Engineering plastics like POM and PTFE possess inherent self-lubricating properties, eliminating the need for grease or oil that could contaminate cleanroom environments or delicate parts.

Q: What tolerances can be achieved on custom plastic positioning pins?

A: Standard machining tolerances are held within ±0.02 mm. Tight tolerances down to ±0.01 mm can be achieved through controlled machining parameters and post-machining stabilization.

Q: Can you provide material test certificates with our shipment?

A: Yes. Material Test Reports (MTR) and Certificates of Conformance (CoC) are issued with every batch detailing raw material lot numbers and inspection results.

RFQ

To obtain an accurate quotation or technical review for your project, please provide the following details:

Drawing / CAD File: 2D drawing (PDF/DWG) with critical tolerances and 3D model (STEP/IGES).

Material Requirement: Specific polymer grade (e.g., POM-C, unfilled PEEK, ESD PEEK) or operational environment conditions (temperature, load, chemicals).

Quantity: Prototype quantity vs. annual estimated volume (forecast).

Target Delivery Timeline: Required sample dispatch date and batch production schedule.

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