# Gas springs and gas struts: rod / tube diameters, end threads, stroke and extended-length series (nb-parts, SUSPA 16-3, McMaster-Carr)

> What stroke and extended lengths do common gas springs come in, and what thread and diameters do the common series use?

- Category: Hardware › Bearings, rails & motion
- Kind: Standard part
- Basis: nb-parts' gas spring catalogue (Ø pairs, threads, stroke ranges), SUSPA's type 16-3 data, and McMaster-Carr's painted-steel eyelet and 316 stainless adjustable-force tables (extended, compressed, stroke); numbers only
- Page: https://xemstudio.com/objects/gas-springs-series-and-strokes/ · JSON: https://xemstudio.com/api/geometry?object=gas-springs-series-and-strokes · Plain text: https://xemstudio.com/objects/gas-springs-series-and-strokes/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

- nb-parts rows: model name, the Ø pair as printed (the text does not label which Ø is the rod), the thread as printed and the stroke range in mm. The catalogue's GF 20/40 appears twice with different data (M14, 50–600 mm; M14x1.5, 100–700 mm); both are shown. Extended-length formulas that appeared in a machine reading of the catalogue are not shown because the source text does not state them.
- SUSPA type 16-3: rod Ø8 mm, tube Ø21.5 mm, tube end M8 x 1.0, rod end M6 x 1.0, tube length 85 to 535 mm, force range 100 to 600 N (the page prints the minimum tube length as 'rod (B) + 37'), all as printed. The page does not give the stroke / extended-length pairs, so none is shown.
- McMaster-Carr rows are inches as printed on its gas spring page: the painted-steel series with eyelet fittings (extended, compressed and stroke; body Ø0.47 in, rod Ø0.16 in, M4 rod thread) and the 316 stainless adjustable-force series (M8 rod on a 0.88 in body, M10 rod on a 1.17 in body, with extended and compressed force in lbf). The page states that each end fitting adds its own Length 1 to the extended and compressed lengths of the spring, so the figures are for the spring without fittings.
- End fittings, eyelets and ball sockets and their threads are on gas-spring-end-fittings. The gas-spring-cylinder-18mm page is a different thing (a thermodynamic gas spring in a free-piston Stirling engine); springs covers coil springs.
- No file: the gas spring is a cylinder and rod whose end fittings and tube ends are not given as numbers. McMaster-Carr sells gas springs, locking gas springs and end fittings with per-part STEP; 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 |
|---|---|---|---|---|
| end thread | M5, M6, M8, M10, M14, M14x1.5, M20x1.5, M24x2 (nb-parts series); M8 rod / M10 rod (McMaster 316 stainless) | end fitting (eyelet, ball socket, fork) with the same internal thread | designed | all |

## Sizes

| source | model / part | diameters | end thread | stroke | extended length | compressed length | force |
|---|---|---|---|---|---|---|---|
| nb-parts | GF 3/10 | Ø 3 / 10 mm | M3.5 / M4 (as printed) | 10–80 mm | — | — | — |
| nb-parts | GF 6/15 M5 | Ø 6 / 15 mm | M5 | 50–200 mm | — | — | — |
| nb-parts | GF 8/19 M6 | Ø 8 / 19 mm | M6 | 75–300 mm | — | — | — |
| nb-parts | GF 10/22 M8 | Ø 10 / 22 mm | M8 | 75–400 mm | — | — | — |
| nb-parts | GF 10/28 M8 | Ø 10 / 28 mm | M8 | 75–400 mm | — | — | — |
| nb-parts | GF 14/28 M10 | Ø 14 / 28 mm | M10 | 100–500 mm | — | — | — |
| nb-parts | GF 20/40 M14 | Ø 20 / 40 mm | M14 | 50–600 mm | — | — | — |
| nb-parts | GF 20/40 (standard section) | Ø 20 / 40 mm | M14x1.5 | 100–700 mm | — | — | — |
| nb-parts | GF 25/55 | Ø 25 / 55 mm | M20x1.5 | 100–700 mm | — | — | — |
| nb-parts | GF 30/65 | Ø 30 / 65 mm | M24x2 | 100–700 mm | — | — | — |
| nb-parts | GF 10/22 with welded eyelets | Ø 10 / 22 mm | — (eyelets) | 250–1150 mm | — | — | — |
| SUSPA type 16-3 | 16-3 | rod Ø8 / tube Ø21.5 mm | tube end M8 x 1.0; rod end M6 x 1.0 | tube length 85 to 535 mm (as printed) | — | — | 100 to 600 N (extended) |
| McMaster-Carr painted steel, eyelet fittings | 9417K71 | body Ø0.47 in; rod Ø0.16 in; rod thread M4 (series values) | M4 rod | stroke 0.79 in | 3.54 in | 2.76 in | — |
| McMaster-Carr painted steel, eyelet fittings | 9417K1 | body Ø0.47 in; rod Ø0.16 in; rod thread M4 (series values) | M4 rod | stroke 1.18 in | 4.33 in | 3.15 in | — |
| McMaster-Carr painted steel, eyelet fittings | 9417K2 | body Ø0.47 in; rod Ø0.16 in; rod thread M4 (series values) | M4 rod | stroke 1.57 in | 5.11 in | 3.54 in | — |
| McMaster-Carr painted steel, eyelet fittings | 4253N11 | body Ø0.47 in; rod Ø0.16 in; rod thread M4 (series values) | M4 rod | stroke 1.85 in | 5.71 in | 3.86 in | — |
| McMaster-Carr painted steel, eyelet fittings | 9417K3 | body Ø0.47 in; rod Ø0.16 in; rod thread M4 (series values) | M4 rod | stroke 2.17 in | 6.29 in | 4.12 in | — |
| McMaster-Carr painted steel, eyelet fittings | 9417K4 | body Ø0.47 in; rod Ø0.16 in; rod thread M4 (series values) | M4 rod | stroke 2.56 in | 7.08 in | 4.52 in | — |
| McMaster-Carr painted steel, eyelet fittings | 4253N12 | body Ø0.47 in; rod Ø0.16 in; rod thread M4 (series values) | M4 rod | stroke 2.83 in | 7.68 in | 4.85 in | — |
| McMaster-Carr painted steel, eyelet fittings | 9417K5 | body Ø0.47 in; rod Ø0.16 in; rod thread M4 (series values) | M4 rod | stroke 3.15 in | 8.26 in | 5.11 in | — |
| McMaster-Carr painted steel, eyelet fittings | 9417K6 | body Ø0.47 in; rod Ø0.16 in; rod thread M4 (series values) | M4 rod | stroke 3.54 in | 9.05 in | 5.51 in | — |
| McMaster-Carr painted steel, eyelet fittings | 4253N13 | body Ø0.47 in; rod Ø0.16 in; rod thread M4 (series values) | M4 rod | stroke 3.94 in | 9.84 in | 5.90 in | — |
| McMaster-Carr painted steel, eyelet fittings | 4253N14 | body Ø0.47 in; rod Ø0.16 in; rod thread M4 (series values) | M4 rod | stroke 4.33 in | 10.63 in | 6.30 in | — |
| McMaster-Carr painted steel, eyelet fittings | 4253N15 | body Ø0.47 in; rod Ø0.16 in; rod thread M4 (series values) | M4 rod | stroke 4.72 in | 11.42 in | 6.70 in | — |
| McMaster-Carr painted steel, eyelet fittings | 4253N16 | body Ø0.47 in; rod Ø0.16 in; rod thread M4 (series values) | M4 rod | stroke 5.12 in | 12.20 in | 7.08 in | — |
| McMaster-Carr painted steel, eyelet fittings | 4253N17 | body Ø0.47 in; rod Ø0.16 in; rod thread M4 (series values) | M4 rod | stroke 5.51 in | 12.99 in | 7.48 in | — |
| McMaster-Carr painted steel, eyelet fittings | 4253N18 | body Ø0.47 in; rod Ø0.16 in; rod thread M4 (series values) | M4 rod | stroke 5.91 in | 13.78 in | 7.87 in | — |
| McMaster-Carr painted steel, eyelet fittings | 4253N19 | body Ø0.47 in; rod Ø0.16 in; rod thread M4 (series values) | M4 rod | stroke 6.30 in | 14.57 in | 8.27 in | — |
| McMaster-Carr painted steel, eyelet fittings | 4253N21 | body Ø0.47 in; rod Ø0.16 in; rod thread M4 (series values) | M4 rod | stroke 6.69 in | 15.35 in | 8.66 in | — |
| McMaster-Carr painted steel, eyelet fittings | 4253N22 | body Ø0.47 in; rod Ø0.16 in; rod thread M4 (series values) | M4 rod | stroke 7.09 in | 16.14 in | 9.05 in | — |
| McMaster-Carr 316 stainless adjustable-force | 6626K54 | body Ø0.88 in; rod Ø0.38 in | rod thread M8 | stroke 2 in | 8.25 in | 6.25 in | 249 lbf ext. / 283 lbf comp. |
| McMaster-Carr 316 stainless adjustable-force | 6626K71 | body Ø1.17 in; rod Ø0.56 in | rod thread M10 | stroke 2 in | 10.5 in | 8.5 in | 517 lbf ext. / 622 lbf comp. |
| McMaster-Carr 316 stainless adjustable-force | 6626K55 | body Ø0.88 in; rod Ø0.38 in | rod thread M8 | stroke 4 in | 12.25 in | 8.25 in | 248 lbf ext. / 384 lbf comp. |
| McMaster-Carr 316 stainless adjustable-force | 6626K72 | body Ø1.17 in; rod Ø0.56 in | rod thread M10 | stroke 4 in | 14.5 in | 10.5 in | 517 lbf ext. / 873 lbf comp. |
| McMaster-Carr 316 stainless adjustable-force | 6626K56 | body Ø0.88 in; rod Ø0.38 in | rod thread M8 | stroke 6 in | 16.25 in | 10.25 in | 249 lbf ext. / 354 lbf comp. |
| McMaster-Carr 316 stainless adjustable-force | 6626K73 | body Ø1.17 in; rod Ø0.56 in | rod thread M10 | stroke 6 in | 18.5 in | 12.5 in | 522 lbf ext. / 890 lbf comp. |
| McMaster-Carr 316 stainless adjustable-force | 6626K57 | body Ø0.88 in; rod Ø0.38 in | rod thread M8 | stroke 8 in | 20.25 in | 12.25 in | 249 lbf ext. / 353 lbf comp. |
| McMaster-Carr 316 stainless adjustable-force | 6626K74 | body Ø1.17 in; rod Ø0.56 in | rod thread M10 | stroke 8 in | 22.5 in | 14.5 in | 518 lbf ext. / 857 lbf comp. |
| McMaster-Carr 316 stainless adjustable-force | 6626K58 | body Ø0.88 in; rod Ø0.38 in | rod thread M8 | stroke 10 in | 24.25 in | 14.25 in | 245 lbf ext. / 348 lbf comp. |
| McMaster-Carr 316 stainless adjustable-force | 6626K75 | body Ø1.17 in; rod Ø0.56 in | rod thread M10 | stroke 10 in | 26.5 in | 16.5 in | 520 lbf ext. / 838 lbf comp. |
| McMaster-Carr 316 stainless adjustable-force | 6626K59 | body Ø0.88 in; rod Ø0.38 in | rod thread M8 | stroke 12 in | 28.25 in | 16.25 in | 247 lbf ext. / 365 lbf comp. |
| McMaster-Carr 316 stainless adjustable-force | 6626K76 | body Ø1.17 in; rod Ø0.56 in | rod thread M10 | stroke 12 in | 30.5 in | 18.5 in | 520 lbf ext. / 876 lbf comp. |
| McMaster-Carr 316 stainless adjustable-force | 6626K61 | body Ø0.88 in; rod Ø0.38 in | rod thread M8 | stroke 14 in | 32.25 in | 18.25 in | 248 lbf ext. / 368 lbf comp. |
| McMaster-Carr 316 stainless adjustable-force | 6626K62 | body Ø0.88 in; rod Ø0.38 in | rod thread M8 | stroke 16 in | 36.25 in | 20.25 in | 245 lbf ext. / 366 lbf comp. |
| McMaster-Carr 316 stainless adjustable-force | 6626K77 | body Ø1.17 in; rod Ø0.56 in | rod thread M10 | stroke 16 in | 38.5 in | 22.5 in | 514 lbf ext. / 866 lbf comp. |
| McMaster-Carr 316 stainless adjustable-force | 6626K78 | body Ø1.17 in; rod Ø0.56 in | rod thread M10 | stroke 20 in | 46.5 in | 26.5 in | 516 lbf ext. / 847 lbf comp. |
| McMaster-Carr 316 stainless adjustable-force | 6626K79 | body Ø1.17 in; rod Ø0.56 in | rod thread M10 | stroke 24 in | 54.5 in | 30.5 in | 516 lbf ext. / 868 lbf comp. |

## Where the files are

- nb-parts: [Gas springs catalogue: Ø pairs, end thread, stroke ranges and end fittings (M3.5 to M24, ball sockets, eyelets, forks)](https://www.nb-parts.de/pdf/catalogues/nb-parts_gas-springs_en.pdf) — web — Maker catalogue; numbers only. The source text does not label which Ø of a pair is the rod
- SUSPA: [Gas spring type 16-3: rod Ø8, tube Ø21.5, tube end M8 x 1.0, rod end M6 x 1.0, tube length 85 to 535 mm, force 100 to 600 N](https://www.suspa.com/us/products/gas-springs/gas-springs-type-16-3) — web — Maker product page; numbers only
- McMaster-Carr: [Gas springs, McMaster-Carr 'About gas springs' (eyelet series, adjustable-force stainless series, end fittings) (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/gas-spring-fitting-eyelets) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)
- McMaster-Carr: [Mechanical struts and gas springs (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/mechanical-struts/) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)
- McMaster-Carr: [Locking gas springs (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/locking-gas-springs) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)

## Questions

**What is the stroke range of a 10/22 gas spring?**

nb-parts lists the GF 10/22 M8 at 75–400 mm stroke (the version with welded eyelets 250–1150 mm); SUSPA's 8 mm rod, 21.5 mm tube spring has M6 rod and M8 tube end threads.

**What thread does an 8 mm rod gas spring have?**

SUSPA type 16-3 (rod Ø8): rod end M6 x 1.0 and tube end M8 x 1.0. nb-parts' GF 8/19 is listed with M6 and McMaster's 316 stainless 0.38 in rod has an M8 thread.

**How much longer is a gas spring when extended?**

By its stroke: McMaster lists extended = compressed + stroke (for example 8.26 in = 5.11 in + 3.15 in), before end fittings.

## Fits with

- [Gas spring end fittings: eyelet and fitting threads M3.5–M14, ball studs Ø8 / Ø10 / Ø13 (M4–M10), ball sockets and forks](https://xemstudio.com/objects/gas-spring-end-fittings/)
- [Compression springs, wire Ø0.5–1.6, OD 6–16](https://xemstudio.com/objects/compression-springs/)
- [Double-acting Ø18 gas-spring cylinder, gland and piston for a 2 in spool](https://xemstudio.com/objects/gas-spring-cylinder-18mm/)
- [Clevis pins ISO 2341 B, Ø3 to Ø8](https://xemstudio.com/objects/clevis-pins/)
- [RAM-style mount ball sizes: A 0.56, B 1, C 1.5, D 2.25 and E 3.38 in](https://xemstudio.com/objects/ram-mount-ball-sizes/)
- [17 mm ball joint for phone mounts (ball stud)](https://xemstudio.com/objects/phone-mount-ball-17mm/)