Product Category
POM — 12 Product Lines
POM / Acetal
/ Delrin
CNC Parts
12 product lines in POM homopolymer (Delrin) and POM copolymer (Acetal) — plastic gears, slide blocks, guide parts, shaft sleeves, bushings, rollers, locating blocks, fixture blocks, tooling parts, insulating supports, conveyor parts, and automation wear parts. Self-lubricating · H7 bore · FDA compliant option.
Engineering Plastic Property Comparison
Grade
Friction
Moisture
Tolerance
POM Delrin
0.20–0.35
<0.25% ◀
H7 ◀
Nylon PA6
0.25–0.45
2.5–3.5%
H8/H9
PTFE
0.04–0.10
<0.01%
H8/H9
PEEK
0.35–0.50
<0.05%
H7
<0.25%
Moisture Abs.
H7
Bore Tolerance
12
Product Lines
<0.25%
Moisture Abs.
H7
Bore Tolerance
FDA
Compliant Option
24hr
Quote
Plastic Gear ✦
Slide Block ✦
Guide Part ✦
Shaft Sleeve ✦
Bushing ✦
Roller ✦
Locating Block ✦
Fixture Block ✦
Tooling Part ✦
Insulating Support ✦
Conveyor Part ✦
Automation Wear Part ✦
Plastic Gear ✦
Slide Block ✦
Guide Part ✦
Shaft Sleeve ✦
Bushing ✦
Roller ✦
Locating Block ✦
Fixture Block ✦
Tooling Part ✦
Insulating Support ✦
Conveyor Part ✦
Automation Wear Part ✦
Full Product Range
12 POM / Acetal Parts Across
3 Application Categories
POM Homopolymer (Delrin) · POM Copolymer (Acetal) · H7 bore · ±0.05mm profile · FDA option · MOQ 1 piece
Product Categories
Motion & Wear PartsQuote →
Six POM motion and wear parts — gears, slide blocks, guide components, shaft sleeves, plain bearings, and rollers. POM (Delrin/Acetal) is the default engineering plastic for these applications because of its unique combination of low coefficient of friction (0.20–0.35 against steel, dry — no external lubrication needed for most applications), high stiffness (2.8 GPa — POM gears maintain tooth profile under load better than nylon), and extremely low moisture absorption (<0.25% vs nylon 2.5–8%) — meaning POM bushings maintain H7 bore tolerance in humid environments where nylon bushings would swell and bind.
POM-001
MOTION / 001 — FEATURED
POM Plastic Gears
POM Delrin (homopolymer, highest stiffness) and POM Acetal (copolymer) precision plastic gears — spur, bevel, and helical profiles — for low-noise, self-lubricating drive trains in office equipment, medical devices, consumer appliances, automation, and food-processing machinery. POM gear advantages over metal gears: self-lubricating (no external lubrication required in most applications); low running noise (POM tooth elasticity absorbs gear mesh impact); corrosion-free in humid and chemically aggressive environments; lighter than metal; and electrically non-conductive. Gear tooth profile machined by CNC form milling (all module sizes) or gear hobbing (Module ≥0.5, standard profile DIN 867); tooth accuracy class DIN 3967 class 9–10 standard. Bore H7 standard — critical dimension for gear positioning on shaft; bore/OD concentricity ≤0.05mm. Face runout ≤0.05mm. Homopolymer POM (Delrin) specified for smaller gears (OD <60mm, tooth module ≤2) where maximum stiffness is required; copolymer POM for larger sections where centreline porosity in homopolymer would be a risk. Natural (white/ivory) FDA-compliant POM for food-processing gear applications.
POM Homopolymer (Delrin) · POM CopolymerGet Quote
POM-002/003/004
MOTION / 002–004
Slide Blocks, Guide Parts & Shaft Sleeves
POM slide blocks (profile ±0.05mm, Ra ≤0.4μm sliding face), linear guide components (bore H7 or profile ±0.05mm), and shaft sleeves (bore H7, concentricity ≤0.05mm). All surfaces self-lubricating — no external lubrication required for dry-running applications up to 0.1 m/s sliding speed.
POM Delrin · POM CopolymerGet Quote
POM-005/006
MOTION / 005–006
Bushings & Rollers
POM plain bearing bushings (H7 bore, Ra ≤0.4μm, self-lubricating, electrical insulation CTI ≥175V) and rollers/wheels (H7 bore, OD runout ≤0.05mm, Ra ≤0.4μm OD running surface). POM bushing bore maintains H7 in humid environments — unlike nylon which swells up to 2.5% in water absorption.
POM Delrin · POM CopolymerGet Quote
Materials: POM Homopolymer (Delrin) · POM Copolymer (Acetal/Celcon) · Glass-filled POM
Request All 6 →
Fixture & Tooling PartsQuote →
Four POM fixture and tooling parts — locating blocks, clamping fixture blocks, tooling and jig components, and electrical insulating supports. POM is specified for fixture and tooling applications because it is non-marking (will not scratch or contaminate metal workpiece surfaces), electrically non-conductive (safe in proximity to live electrical assemblies), dimensionally stable (low moisture absorption means fixture dimensions are repeatable), and lightweight (approximately 1/7 the weight of steel for the same volume — reducing fixture inertia for automated fixture applications).
POM-007/008
FIXTURE / 007–008 — FEATURED
Locating Blocks & Fixture Blocks
POM Delrin precision locating blocks and clamping fixture blocks for assembly jigs, inspection fixtures, and automated handling equipment. Locating blocks: datum face flatness ±0.02mm; pin hole H7 (±0.010–0.025mm); feature-to-feature position ±0.05mm by CNC single setup — the accuracy that determines fixture repeatability and assembly dimensional consistency. CMM verification on first article for all precision locating blocks. Fixture and clamping blocks: profile ±0.05mm; clamp face Ra ≤0.4μm; workpiece contact face non-marking (POM leaves no marks or contamination on machined metal, PCB, or sensitive component surfaces). Key advantage of POM over aluminium fixture blocks: electrically non-conductive — POM fixture blocks can contact live PCB components or battery terminals during assembly without risk of short circuit; lower weight (1.42 g/cm³ vs 2.70 g/cm³ aluminium) reduces fixture inertia in automated assembly equipment; no galvanic corrosion risk at dissimilar metal interfaces. Blue or black POM for colour-coding and visual assembly guidance.
POM Homopolymer (Delrin) · POM CopolymerGet Quote
POM-009
FIXTURE / 009
Tooling & Jig Parts
POM Delrin tooling jig components — push-off paddles, gripper fingers, product nest inserts, and workpiece support elements. Profile ±0.05mm; non-marking surface; electrically non-conductive; dimensionally stable. Custom profile to drawing. Colour POM (black, blue, red) for visual part identification on production line.
POM Delrin · POM CopolymerGet Quote
POM-010
FIXTURE / 010
Insulating Supports
POM Acetal electrical insulating support parts — standoffs, spacers, and support brackets for electrical and electronic assemblies. CTI ≥175V (comparative tracking index) — adequate for most low-voltage <1kV electrical insulation applications. Profile ±0.05mm; bore or pin hole H8; non-conductive; lightweight. For higher voltage or higher CTI requirements, PEEK or G10/FR4 specified instead.
POM Copolymer · POM DelrinGet Quote
Materials: POM Homopolymer (Delrin) · POM Copolymer · Black/Blue POM
Request All 4 →
Conveyor & AutomationQuote →
Two POM conveyor and automation wear parts — conveyor equipment components (chain guides, wear strips, sprocket components) and automation equipment wear parts. POM is the dominant material for food-processing conveyor components because it combines FDA compliance (FDA 21 CFR 177.2470 for both homopolymer and copolymer grades), low friction against chain links (reducing drive motor load and chain wear), good chemical resistance to cleaning agents, and dimensional stability in the humid food-processing environment. For dry automation equipment, POM's self-lubricating property eliminates the lubrication maintenance interval required for bronze or nylon wear parts.
POM-011
CONVEYOR / 011 — FEATURED
Conveyor Equipment Parts — FDA Compliant
POM Delrin and POM copolymer conveyor chain guides, wear strips, end guides, and sprocket components for food processing, pharmaceutical packaging, and general product conveyor systems. FDA 21 CFR 177.2470 compliant natural (white/ivory) POM for all food-contact conveyor applications — not black or coloured POM which may contain non-food-approved pigments and cannot be FDA-cited. POM properties critical for conveyor application: (1) Low friction against chain links (dynamic CoF 0.20–0.35 dry) reduces conveyor drive motor load by 20–30% vs UHMW-PE in high-speed applications; (2) Dimensional stability in wet food plant environments — POM chain guide maintains profile within ±0.1mm in continuous water spray conditions where nylon would swell and bind; (3) Chemical resistance to NaOH (caustic soda, common CIP cleaning chemical), chlorine-based sanitisers, and acidic cleaning solutions at ambient temperature; (4) NSF/3-A dairy approval available on request for dairy processing applications. Profile tolerance ±0.05mm for chain guide fit; wear face Ra ≤0.8μm. T-slot and attachment bolt patterns to conveyor manufacturer standard (Intralox, Rexnord, Habasit dimensional standards).
POM Natural (FDA) · POM Copolymer NaturalGet Quote
POM-012
AUTOMATION / 012
Automation Wear Parts
POM Acetal automation equipment wear parts — cam followers, linear bearing inserts, stop blocks, and sliding interface components for pick-and-place and assembly automation. Ra ≤0.4μm sliding face; self-lubricating (no maintenance lubrication required); profile ±0.05mm. POM's consistent CoF from 0°C to 80°C operation enables predictable servo motor load calculation for automation design.
POM Delrin · POM CopolymerGet Quote
Materials: POM Natural (FDA) · POM Copolymer Natural · Black POM
Request All 2 →Manufacturing Capability
What POM Machining Requires
Different from Metal Machining
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Thermal Expansion — 3× Steel
POM thermal expansion coefficient ~100×10⁻⁶/°C vs steel ~12×10⁻⁶/°C. For a POM bushing bored to H7 at 20°C, at 60°C operating temperature the bore expands by approximately 0.04mm per 10mm of diameter — potentially transitioning from H7 to H8. We discuss operating temperature at DFM review and adjust bore dimension to account for thermal expansion at service temperature when specified.
Operating temp. reviewBore compensation
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Low Moisture Absorption — H7 in Wet Environments
POM moisture absorption <0.25% — dimensional change in water immersion is <0.1mm per 100mm of dimension, allowing H7 bore tolerance to be maintained in wet food-processing and humid environments. This is POM's decisive advantage over nylon (2.5–8% moisture absorption, dimensional change 0.3–1.5mm per 100mm) for precision bore applications. We specify POM (not nylon) for all applications where tight bore tolerance must be maintained in service.
<0.25% moistureH7 in wet service
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Gear Tooth Machining — Form Mill or Hob
POM gears machined by two methods: CNC form milling (involute profile milled with single form cutter, all module sizes, slower, suitable for small quantities); gear hobbing (dedicated gear hobbing machine, Module ≥0.5 standard DIN 867 profile, tooth accuracy DIN class 9–10, faster for production quantities). Gear blank bore H7 and OD to tolerance machined first; tooth cutting performed after bore qualification to ensure bore-to-tooth concentricity.
DIN 3967 cl.9–10Form mill or hob
Precision Specifications
Tolerances & Material Reference — POM / Acetal / Delrin
📐
Tolerances by Feature
Bore
H7
OD Turned
h7
OD Runout
≤0.05 mm
Profile (milled)
±0.05 mm
Face Flatness
±0.02 mm
Surface (sliding)
Ra ≤0.4 μm
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Material Properties Reference
Moisture Absorption
<0.25%
vs Nylon PA6 2.5–8%. H7 bore maintained in wet environments. Best plastic for precision bore.
Friction (CoF dry)
0.20–0.35
Self-lubricating against steel. No external lubrication required for most dry-running applications.
CTI Tracking Resist.
≥175V
Adequate for low-voltage (<1kV) electrical insulation. Use PEEK or G10 for higher voltage.
FDA Compliance
21 CFR 177.2470
Natural (white) POM only — black/colour grades may contain non-FDA approved pigments.
Material Selection
POM Grades for Every Engineering Application
POM grade selection is determined by section thickness, FDA requirement, and whether enhanced properties (glass-filled, PTFE-filled, UV-stable) are required.
MAT / 01
POM Homopolymer (Delrin)
Higher stiffness · Sections <25mm
DuPont Delrin brand homopolymer POM. Highest stiffness and hardness of POM grades — preferred for gears (Module ≤2, OD <60mm) where maximum tooth rigidity is required. Natural (white/ivory) for FDA food contact; black for general industrial. Avoid centreline porosity risk in sections >25mm — specify copolymer POM for thick sections.
GearsSections <25mm
MAT / 02
POM Copolymer (Acetal/Celcon)
Better chemical resistance · All section sizes
Copolymer POM (Celanese Celcon, various brands). Better chemical resistance than homopolymer — more resistant to strong bases; lower tendency to centreline porosity in thick sections (>25mm). Slightly lower stiffness than homopolymer. Standard for bushings, slide blocks, fixture blocks, and all structural parts >25mm thickness. Natural (white) for FDA applications.
All section sizesConveyor
MAT / 03
POM + PTFE Filled
Lower friction · Self-lubricating enhanced
POM with 5–15% PTFE filler — CoF reduced to 0.08–0.15 against steel (vs 0.20–0.35 unfilled POM). Specified for slide blocks and bushings in continuous sliding contact where lower friction reduces drive force and heat generation. Slightly lower mechanical strength than unfilled POM — check load requirements at DFM.
Slide blocksBushings
MAT / 04
POM + Glass Filled (GF20)
Higher stiffness · Gear heavy load
POM with 20% glass fibre — stiffness increased to ~5 GPa (vs 2.8 GPa unfilled). Used for gears and structural parts under high compressive load where unfilled POM deflects. Rougher surface finish than unfilled POM — not for sliding contact surfaces without secondary finish. Lower self-lubricating behaviour (glass acts as abrasive, not lubricant).
Heavy-load gears
Production Workflow
From Drawing to Precision POM Part
01
DFM Review
Grade (Delrin vs copolymer), section thickness, operating temperature, FDA requirement, and bore thermal compensation confirmed.
02
Material
Natural (FDA) or black POM bar/rod/sheet from certified stock. Material datasheet and grade certificate available.
03
CNC Machine
Sharp HSS or carbide tooling. Controlled cutting temperature to prevent POM thermal deformation. No coolant contamination.
04
Gear Teeth
Gear hobbing (Module ≥0.5) or CNC form milling. DIN 3967 class 9–10 tooth accuracy. Bore H7 machined first.
05
Inspection
Bore H7, profile ±0.05mm, face flatness ±0.02mm, OD runout ≤0.05mm. CMM first article on fixture blocks and locating blocks.
06
Deliver
Sealed packaging prevents surface contamination. Inspection report. FDA material datasheet for food-contact applications.
Our Advantage
Why Engineers Choose Our POM Parts
H7
H7 Bore in Wet Service — POM Not Nylon
We specify POM (not nylon) for all applications requiring H7 bore tolerance in wet or humid environments. Nylon absorbs 2.5–8% moisture and swells by 0.3–1.5mm per 100mm — a nylon bushing bored to H7 will bind on its shaft within days of water contact. POM moisture absorption <0.25% keeps the bore within H7/H8 in continuous water service.
Temp
Operating Temperature — Bore Compensation
POM thermal expansion is 3× steel — at 80°C, a 20mm POM bore expands approximately 0.1mm. For applications at elevated temperature, we adjust the bore dimension at DFM so the H7 fit is achieved at operating temperature, not just at room temperature. We ask about operating temperature before machining, not after the customer reports binding in service.
FDA
FDA Natural POM — Correct Grade Specified
FDA compliance (21 CFR 177.2470) applies only to natural (white/ivory) POM — not black or coloured POM which may contain non-food-approved carbon black or colour pigments. We specify natural POM automatically for all food-contact enquiries and flag if the customer has specified black POM for a food-contact application.
CoP
Copolymer for Thick Sections
Homopolymer POM (Delrin) can develop centreline porosity in sections >25mm diameter from crystallisation shrinkage — invisible externally but causing mechanical weakness along the centreline. We specify copolymer POM for all turning stock >25mm diameter, regardless of whether the customer has specified Delrin by name. Both grades machine identically; the distinction matters only for material quality.
Frequently Asked Questions
POM / Acetal / Delrin — Common Questions
POM (polyoxymethylene) is a semi-crystalline engineering thermoplastic with unique properties for precision plastic parts: low friction (CoF 0.20–0.35, self-lubricating); low moisture absorption <0.25% (maintains H7 bore in wet environments); high stiffness (2.8 GPa) for gears and bearings; good machinability — achieves H7 bore and ±0.05mm profile. 'Delrin' = DuPont's homopolymer POM (higher stiffness); 'Acetal' = copolymer POM (better chemical resistance, use for sections >25mm). Both machine identically.
Bore: H7 (±0.010–0.025mm). OD: h7. OD runout: ≤0.05mm. Profile: ±0.05mm. Face flatness: ±0.02mm. Surface: Ra ≤0.4μm sliding faces. Key consideration: POM thermal expansion is 3× steel — bore must be sized for operating temperature, not just room temperature. For applications above 60°C, discuss with us at DFM to allow bore thermal compensation.
Yes — natural (white) POM is FDA compliant per 21 CFR 177.2470. Important: black and coloured POM may contain non-FDA-approved pigments — only natural/white POM is FDA citable for food contact. POM is ideal for food-processing conveyor guides, wear strips, and sprocket components: low friction, good cleaning chemical resistance, dimensional stability in humid environments. NSF/3-A dairy approval available on request.
MOQ: 1 piece. POM machines very quickly. Lead times: simple turned parts (bushings, sleeves, rollers): 3–7 working days. Milled parts (slide blocks, fixture blocks): 5–10 working days. Precision gears: 7–14 working days. Production 100+ pieces: 7–14 working days with volume pricing. Natural (FDA white) and black POM available from stock. Colour POM (blue, red) 3–5 days additional for material procurement.
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Every enquiry includes a DFM review — tolerance feasibility, material confirmation, and process approach confirmed before production starts. MOQ 1 piece.
24hr
Quote Response
MOQ 1
Prototypes OK
ISO
9001:2015
📐
DFM Review on Every Enquiry
Tolerance feasibility, fixturing strategy, and material confirmation. Specific, actionable feedback — not generic pushback.
🎯
First Article Inspection — Standard
FAI report on every new run. Material certs and surface treatment certs included with every shipment.
🔄
Same Process: Prototype to Production
Process plan from your prototype applies to production batches. No re-qualification when you scale.
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3 / 4 / 5-Axis CNC + Turning
Complex structural parts, shafts, housings, and transmission components. Metals and engineering plastics.
ISO 9001:2015
3/4/5-Axis Milling
CNC Turning
CMM Inspection
Global Delivery