Machined Delrin Parts
Delrin (acetal homopolymer, DuPont) is the go-to engineering plastic for machined mechanical parts that need low friction, good stiffness, and tight tolerances at an economical price point. It machines faster than most other engineering plastics, holds dimensions well in moderate environments, and delivers a smooth, self-lubricating surface straight off the machine — no secondary finishing required for most applications.
Federal Materials machines Delrin to customer prints in any quantity, from single prototypes to production runs of thousands. We stock Delrin rod, sheet, and plate in standard and custom sizes, and our CNC turning and milling cells deliver consistent tolerances run-to-run. If you are specifying acetal for your part, confirm whether Delrin (homopolymer) or acetal copolymer is the right choice — they are related but distinct materials with different weld-line behavior and chemical resistance profiles.
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Request a Quote →What We Machine in Delrin
- Gears and gear blanks — spur, bevel, worm; turned and hobbed or CNC milled
- Bushings and plain bearings — close-tolerance ID/OD, self-lubricating
- Cams and cam followers — custom profiles CNC milled from plate
- Valve bodies and seats — food-grade and water-service applications
- Rollers and guide rollers — OD-turned to fine finish
- Standoffs and spacers — hex and round, threaded and through-bore
- Structural brackets and panels — drilled, tapped, counterbored
- Pulleys and sheaves — turned OD, bored and keyway-cut
- Prototypes and one-off parts — same-week delivery from stock
Typical Tolerances
| Dimension type | Production tolerance |
|---|---|
| Critical turned dims (OD/ID) | ±0.001" |
| General machined dims | ±0.005" |
| Hole location (CNC milled) | ±0.003" |
| Flatness (plates ≤ 12") | ±0.005" |
| Thread form | 2B/3B per print |
Delrin exhibits some moisture-related dimensional change in humid environments — approximately 0.001" per inch across the grain for standard Delrin 150. For close-tolerance applications in high-humidity environments, discuss stabilization options at time of RFQ.
Finish Options
| Finish | Description |
|---|---|
| As-machined | Natural white/black Delrin surface — smooth, self-lubricating, no treatment needed |
| Machined-to-spec edges | Chamfered or radiused per drawing callout |
| Painted / marked | Laser marking or customer-specified marking available |
| No plating | Delrin does not require passivation or metallic surface treatment |
Delrin's natural surface is suitable for most mechanical applications. For food contact, specify FDA-compliant Delrin grade on your RFQ.
Standard Turnaround
| Stage | Lead time |
|---|---|
| Quote response | Same business day |
| Prototype / first article (1–5 pcs) | 2–3 business days |
| Short run (6–50 pcs) | 3–7 business days |
| Production run (50+ pcs) | 7–12 business days |
Delrin is one of the fastest-machining engineering plastics, and we maintain deep stock. Turnaround times for Delrin parts are typically the shortest of any engineering plastic we machine.
Materials We Stock (Delrin Stock Shapes)
| Form | Grade | Sizes |
|---|---|---|
| Rod | Delrin 150 (natural) | ¼" – 10" diameter |
| Rod | Delrin 150 (black) | ¼" – 6" diameter |
| Rod | Delrin AF (PTFE-filled) | ¼" – 4" diameter |
| Sheet / plate | Delrin 150 | 0.250" – 4.000" thick; up to 48" × 96" |
| Slab | Delrin 150 | Large custom slab sizes |
Delrin 150 is the standard injection-molding and machining grade. Delrin AF adds PTFE filler for lower friction in wear applications. FDA-compliant grades available on request.
Quality & Inspection
- Dimensional inspection — in-process and final; CMM first-article available on request
- Material certification — DuPont Delrin brand verification, grade and lot C of C
- Visual inspection — void-free surface, burr-free edges, surface finish verification
- FDA documentation — available for food-contact and pharmaceutical applications on request
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Request a Quote →More Related Guides
- PEEK Machined Parts — step up for higher temperature
- Teflon Machined Parts — PTFE for chemical resistance
- Custom Machined Bushings — all materials
- CNC Turning Thermoset Rod
- Delrin Rod Stock
- Delrin Sheet Stock