# Acetal (Delrin) rod diameters: 1/8 to 2 in and 4 to 250 mm nominal sizes

> What diameters does acetal (Delrin) round rod come in, in inches and millimetres?

- Category: Hardware › Materials & stock
- Kind: Standard part
- Basis: Aircraft Spruce Delrin rod list (inch) and Bearing Boys Delrin rod tolerance table (metric nominal diameters); McMaster-Carr linked
- Page: https://xemstudio.com/objects/acetal-delrin-rod-diameters/ · JSON: https://xemstudio.com/api/geometry?object=acetal-delrin-rod-diameters · Plain text: https://xemstudio.com/objects/acetal-delrin-rod-diameters/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

**Exact dimensions.** True size, with no tolerance added.

## Notes

- Acetal (POM, Delrin is DuPont's trade name) round rod is sold in inch diameters in the US (Aircraft Spruce lists 1/8 to 2 in: 1/8, 5/16, 3/8, 1/2, 5/8, 3/4, 7/8, 1, 1-3/8, 1-1/2, 2 in) and in metric nominal diameters in Europe (Bearing Boys' table: 4 to 250 mm in 39 sizes). Rods are cut oversize so a part can be machined to size: Bearing Boys prints an oversize tolerance per diameter, which was not extracted here, so the table gives nominal diameters only.
- Two sources do not overlap in size, so nothing here is cross-checked between them; each list is as printed. Bearing Boys' text says rods are available from 10 to 200 mm but its tolerance table runs 4 to 250 mm; both are noted rather than resolved. The inch column of the metric list (mm / 25.4) is a conversion, not catalog data.
- No STEP/STL: a rod is a plain cylinder. Left out: rod lengths, colours (white / black), copolymer vs homopolymer grade, nylon, HDPE, UHMW and PTFE rod and sheet (the task listed them; no distributor table of their sizes was read in this pass).

## Sizes

| nominal diameter | mm | source |
|---|---|---|
| 1/8 in | 3.17 | Aircraft Spruce (inch) |
| 5/16 in | 7.94 | Aircraft Spruce (inch) |
| 3/8 in | 9.52 | Aircraft Spruce (inch) |
| 1/2 in | 12.70 | Aircraft Spruce (inch) |
| 5/8 in | 15.88 | Aircraft Spruce (inch) |
| 3/4 in | 19.05 | Aircraft Spruce (inch) |
| 7/8 in | 22.22 | Aircraft Spruce (inch) |
| 1 in | 25.40 | Aircraft Spruce (inch) |
| 1-3/8 in | 34.92 | Aircraft Spruce (inch) |
| 1-1/2 in | 38.10 | Aircraft Spruce (inch) |
| 2 in | 50.80 | Aircraft Spruce (inch) |
| 0.157 in | 4 | Bearing Boys (metric) |
| 0.197 in | 5 | Bearing Boys (metric) |
| 0.236 in | 6 | Bearing Boys (metric) |
| 0.315 in | 8 | Bearing Boys (metric) |
| 0.394 in | 10 | Bearing Boys (metric) |
| 0.472 in | 12 | Bearing Boys (metric) |
| 0.551 in | 14 | Bearing Boys (metric) |
| 0.630 in | 16 | Bearing Boys (metric) |
| 0.709 in | 18 | Bearing Boys (metric) |
| 0.787 in | 20 | Bearing Boys (metric) |
| 0.866 in | 22 | Bearing Boys (metric) |
| 0.984 in | 25 | Bearing Boys (metric) |
| 1.102 in | 28 | Bearing Boys (metric) |
| 1.181 in | 30 | Bearing Boys (metric) |
| 1.260 in | 32 | Bearing Boys (metric) |
| 1.417 in | 36 | Bearing Boys (metric) |
| 1.575 in | 40 | Bearing Boys (metric) |
| 1.772 in | 45 | Bearing Boys (metric) |
| 1.969 in | 50 | Bearing Boys (metric) |
| 2.205 in | 56 | Bearing Boys (metric) |
| 2.362 in | 60 | Bearing Boys (metric) |
| 2.559 in | 65 | Bearing Boys (metric) |
| 2.756 in | 70 | Bearing Boys (metric) |
| 2.953 in | 75 | Bearing Boys (metric) |
| 3.150 in | 80 | Bearing Boys (metric) |
| 3.543 in | 90 | Bearing Boys (metric) |
| 3.937 in | 100 | Bearing Boys (metric) |
| 4.331 in | 110 | Bearing Boys (metric) |
| 4.724 in | 120 | Bearing Boys (metric) |
| 4.921 in | 125 | Bearing Boys (metric) |
| 5.118 in | 130 | Bearing Boys (metric) |
| 5.315 in | 135 | Bearing Boys (metric) |
| 5.512 in | 140 | Bearing Boys (metric) |
| 5.906 in | 150 | Bearing Boys (metric) |
| 6.496 in | 165 | Bearing Boys (metric) |
| 7.087 in | 180 | Bearing Boys (metric) |
| 7.874 in | 200 | Bearing Boys (metric) |
| 9.055 in | 230 | Bearing Boys (metric) |
| 9.843 in | 250 | Bearing Boys (metric) |

## Where the files are

- Aircraft Spruce: [Delrin rod sizes 1/8 to 2 in](https://Aircraftspruce.Com/catalog/mepages/delrinrod.php) — web — Publisher's page; dimensions are facts
- Bearing Boys: [Delrin rod nominal diameters 4 to 250 mm (table of oversize tolerances)](https://bearingboys.co.uk/Delrin-Rods-26-a) — web — Publisher's page; dimensions are facts
- McMaster-Carr: [Delrin acetal resin rods (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/delrin-acetal-resin-rods/) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)

## Questions

**What diameters does Delrin rod come in?**

Inch: 1/8, 5/16, 3/8, 1/2, 5/8, 3/4, 7/8, 1, 1-3/8, 1-1/2 and 2 in (Aircraft Spruce). Metric: 4, 5, 6, 8, 10 mm up to 250 mm (Bearing Boys).

**Is acetal rod oversize?**

Yes, rods are made slightly over nominal; Bearing Boys prints an oversize tolerance per diameter (not extracted here).

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