# O-ring cord stock sizes: 0.070 to 0.500 in and 1.5 to 8.4 mm diameters (round), AS568 series cross-reference

> What diameters does O-ring cord stock come in, and which AS568 O-ring series does each match?

- Category: Hardware › Bearings, rails & motion
- Kind: Standard part
- Basis: McMaster-Carr's printed cord stock width list (inch and metric) and Marco Rubber's cord ranges; the AS568 cross-sections are from as568-o-rings. Numbers only
- Page: https://xemstudio.com/objects/o-ring-cord-stock-sizes/ · JSON: https://xemstudio.com/api/geometry?object=o-ring-cord-stock-sizes · Plain text: https://xemstudio.com/objects/o-ring-cord-stock-sizes/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.** Every file is drawn at true size with no tolerance added. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your process's clearance before making the part.

## Notes

- McMaster-Carr's cord stock page lists these 'For Cord Stock Width' diameters: inch 0.07, 0.103, 0.139, 0.21, 0.275, 0.312, 0.313, 0.375, 0.5 and metric 1.5, 1.6, 2, 2.4, 2.5, 3, 3.5, 4, 5, 5.7, 8.4 mm. 0.312 and 0.313 are both printed, and the page does not say which diameters come in which materials. The inch values 0.070 / 0.103 / 0.139 / 0.210 / 0.275 in are the five AS568 cross-section series (-0xx to -4xx); the mm conversions are inch x 25.4.
- Marco Rubber's page gives ranges only: round cord from 0.039 to 2.000 in, square from 0.099 to 1.000 in, 4-lobed X-ring cord from 0.103 to 1.000 in, in durometers 40 to 90. It prints no step list, tolerances or lengths.
- Tolerances, standard lengths and colours were not printed in the sources read, so none are given. For a ring cut and spliced from cord the cross-section you need is the one in the groove tables: oring-gland-static-radial-as568, oring-gland-dynamic-reciprocating-as568 (inch) and oring-grooves-metric (mm cross-sections 1.0 to 5.7).
- No file: cord is a plain cylinder of the stated diameter and any length, so it is not drawn. McMaster-Carr sells cord stock by the foot; its category page is linked, not copied.

## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn)

| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| diameter | 0.070 / 0.103 / 0.139 / 0.210 / 0.275 in (1.78 / 2.62 / 3.53 / 5.33 / 6.99 mm) | AS568 O-ring cross-section by series (-0xx to -4xx) and its groove on the oring-gland pages | designed | all |
| metric diameter | 1.5 / 1.6 / 2 / 2.4 / 2.5 / 3 / 3.5 / 4 / 5 / 5.7 / 8.4 mm (McMaster list) | metric O-ring groove on oring-grooves-metric (cross-sections 1.0 to 5.7 mm) | designed | all |

## Sizes

| system | diameter | mm | source | AS568 series / note |
|---|---|---|---|---|
| inch | 0.070 in | 1.78 | McMaster-Carr cord stock width list | AS568 -0xx series (CS 1.78 mm per the as568 page) |
| inch | 0.103 in | 2.62 | McMaster-Carr cord stock width list | AS568 -1xx series (CS 2.62 mm per the as568 page) |
| inch | 0.139 in | 3.53 | McMaster-Carr cord stock width list | AS568 -2xx series (CS 3.53 mm per the as568 page) |
| inch | 0.210 in | 5.33 | McMaster-Carr cord stock width list | AS568 -3xx series (CS 5.33 mm per the as568 page) |
| inch | 0.275 in | 6.99 | McMaster-Carr cord stock width list | AS568 -4xx series (CS 6.99 mm per the as568 page) |
| inch | 0.312 in | 7.92 | McMaster-Carr cord stock width list | not an AS568 cross-section |
| inch | 0.313 in | 7.95 | McMaster-Carr cord stock width list | not an AS568 cross-section |
| inch | 0.375 in | 9.52 | McMaster-Carr cord stock width list | not an AS568 cross-section |
| inch | 0.500 in | 12.70 | McMaster-Carr cord stock width list | not an AS568 cross-section |
| metric | 1.5 mm | 1.5 | McMaster-Carr cord stock width list | not an AS568 cross-section |
| metric | 1.6 mm | 1.6 | McMaster-Carr cord stock width list | not an AS568 cross-section |
| metric | 2 mm | 2 | McMaster-Carr cord stock width list | not an AS568 cross-section |
| metric | 2.4 mm | 2.4 | McMaster-Carr cord stock width list | not an AS568 cross-section |
| metric | 2.5 mm | 2.5 | McMaster-Carr cord stock width list | not an AS568 cross-section |
| metric | 3 mm | 3 | McMaster-Carr cord stock width list | not an AS568 cross-section |
| metric | 3.5 mm | 3.5 | McMaster-Carr cord stock width list | not an AS568 cross-section |
| metric | 4 mm | 4 | McMaster-Carr cord stock width list | not an AS568 cross-section |
| metric | 5 mm | 5 | McMaster-Carr cord stock width list | not an AS568 cross-section |
| metric | 5.7 mm | 5.7 | McMaster-Carr cord stock width list | not an AS568 cross-section |
| metric | 8.4 mm | 8.4 | McMaster-Carr cord stock width list | not an AS568 cross-section |
| inch (range) | round 0.039 to 2.000 in | 0.99 to 50.80 | Marco Rubber cord page | range as printed; no list of steps |
| inch (range) | square 0.099 to 1.000 in | 2.51 to 25.40 | Marco Rubber cord page | square cross-section |
| inch (range) | 4-lobed X-ring cord 0.103 to 1.000 in | 2.62 to 25.40 | Marco Rubber cord page | quad-ring / X-ring profile |

## Where the files are

- McMaster-Carr: [O-ring cord stock (for cord width filter: inch and metric diameters as listed) (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/o-ring-stock) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)
- Marco Rubber & Plastics: [O-ring cord: round 0.039 to 2.000 in, square 0.099 to 1.000 in, 4-lobed X-ring cord 0.103 to 1.000 in; durometers 40 to 90](https://www.marcorubber.com/cord.htm) — web — Publisher's page; dimensions are facts

## Questions

**What diameter cord makes a -214 O-ring?**

0.139 in (3.53 mm): the -2xx series. McMaster-Carr lists a 0.139 in cord; the groove for that cross-section is on oring-gland-static-radial-as568.

**What metric O-ring cord sizes are there?**

McMaster-Carr lists 1.5, 1.6, 2, 2.4, 2.5, 3, 3.5, 4, 5, 5.7 and 8.4 mm cord stock.

**What AS568 cross-section is 0.275 in cord?**

The -4xx series (6.99 mm cross-section), the largest standard AS568 series.

## Fits with

- [AS568 O-rings: all 349 standard sizes, -001 to -475](https://xemstudio.com/objects/as568-o-rings/)
- [O-rings, common metric sizes (ISO 3601)](https://xemstudio.com/objects/o-rings-metric/)
- [Metric O-ring groove dimensions: depth, width and radius, 1.0 to 5.7 mm cross-sections](https://xemstudio.com/objects/oring-grooves-metric/)
- [O-ring groove dimensions, static radial gland (piston and rod), AS568 cross-sections](https://xemstudio.com/objects/oring-gland-static-radial-as568/)
- [O-ring groove dimensions, reciprocating (dynamic) gland, piston and rod, AS568](https://xemstudio.com/objects/oring-gland-dynamic-reciprocating-as568/)
- [Backup rings for AS568 O-rings (Parker 8-xxx Parbak, 8-004 to 8-475): ID, OD, width and thickness per dash size](https://xemstudio.com/objects/backup-rings-as568-parker-8-xxx/)
- [Quad-rings / X-rings (Quad-Ring Q4004 to Q4475, AS568 sizes): ID, cross-section and OD per dash](https://xemstudio.com/objects/quad-rings-x-rings-as568/)