# Bungee / shock cord diameters (1/8 to 5/8 in) and the hook sizes that go with them

> What diameters does bungee (shock) cord come in, and what size hook goes with each?

- Category: Hardware › Materials & stock
- Kind: Standard part
- Basis: Aircraft Spruce shock cord list, Albright's Supply cord and coil-hook sizes, Paracord Planet hook set; numbers only; hook / cord pairing as each shop lists it
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**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

- Shock (bungee) cord is elastic cord: rubber strands inside a braided cover, sold by nominal diameter. Aircraft Spruce's shock cord is cotton-covered natural rubber to MIL-C-5651D Type I in the 'certifiable' sizes 1/4, 3/8, 1/2, 5/8 in, plus 1/8 and 5/16 in; Albright's lists 1/8, 3/16, 1/4, 5/16 and 3/8 in. The two lists agree on 1/8, 1/4, 5/16, 3/8; 3/16 is only on Albright's and 1/2, 5/8 only on Aircraft Spruce. Diameters are nominal and no diameter tolerance is printed.
- Hooks: the two shops that pair hooks with a cord do not agree on every size. Paracord Planet's 10-piece wire hook set pairs a 1/4 in hook with 3/16 cord, a 5/16 in hook with 5/16 cord, a 3/8 in hook with 5/16 cord, a 1/2 in hook with 1/2 cord. Albright's metal coil hooks are 1/4 x 2-7/8 (for 1/4 in cord), 3/8 x 2-7/8 (for 3/8 cord) and 1/2 x 2-7/8 (for 1/2 cord), and one plastic adjustable hook is listed for 3/16, 1/4 and 5/16 cord. So the 1/4 in hook fits 1/4 in cord at Albright's but 3/16 in cord at Paracord Planet, and the 3/8 in hook is for 3/8 cord at Albright's but for 5/16 cord at Paracord Planet: both are shown, and the hook size is a trade size, not a measured hole. Aircraft Spruce sells shock-cord fasteners separately in 1/4 and 3/8 in.
- No hook dimension other than Albright's 2-7/8 in coil-hook length is printed in any source read (wire gauge, opening and throat are not given), so no hook drawing exists. The hook / cord pairing is the only mating data.
- Bungee cord with hooks as ready-made 'bungee cords' (lengths 10 to 48 in, hook coating) was not tabulated: no length table with a source was read.
- Rope: double-braid-rope-polyester-nylon-diameters. Paracord: paracord-types-mil-c-5040. Rubber O-ring cord: o-ring-cord-stock-sizes.

## 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 |
|---|---|---|---|---|
| cord diameter 3/16 in | 3/16 in (4.76 mm) | 1/4 in wire hook (Paracord Planet 10-piece set) or Albright's plastic adjustable hook | designed | all |
| cord diameter 1/4 in | 1/4 in (6.35 mm) | 1/4 x 2-7/8 in metal coil hook (Albright's); Aircraft Spruce 1/4 in shock-cord fastener PN 06-12800 | designed | all |
| cord diameter 5/16 in | 5/16 in (7.94 mm) | 5/16 in or 3/8 in wire hook (Paracord Planet), plastic adjustable hook (Albright's) | designed | all |
| cord diameter 3/8 in | 3/8 in (9.52 mm) | 3/8 x 2-7/8 in metal coil hook (Albright's); Aircraft Spruce 3/8 in fastener PN 06-12900 | designed | all |
| cord diameter 1/2 in | 1/2 in (12.7 mm) | 1/2 in wire hook (Paracord Planet) or 1/2 x 2-7/8 in metal coil hook (Albright's) | designed | all |

## Sizes

| source | cord diameter (in) | mm | spec / type | hook paired with it | note |
|---|---|---|---|---|---|
| Aircraft Spruce shock cord | 1/8 in | 3.17 | type not stated | — | PN 06-12100 |
| Aircraft Spruce shock cord | 3/16 in | — | — | — | not listed |
| Aircraft Spruce shock cord | 1/4 in | 6.35 | MIL-C-5651D Type I (certifiable size) | — | PN 06-12200; fastener for 1/4 in is PN 06-12800, sold separately |
| Aircraft Spruce shock cord | 5/16 in | 7.94 | Type III (spec not given) | — | PN 06-12300 |
| Aircraft Spruce shock cord | 3/8 in | 9.52 | MIL-C-5651D Type I (certifiable size) | — | PN 06-12400; fastener for 3/8 in is PN 06-12900, sold separately |
| Aircraft Spruce shock cord | 1/2 in | 12.70 | MIL-C-5651D Type I (certifiable size) | — | PN 06-12500 |
| Aircraft Spruce shock cord | 5/8 in | 15.88 | MIL-C-5651D Type I (certifiable size) | — | PN 06-12600 |
| Albright's Supply bungee / shock cord | 1/8 in | 3.17 | — | — | listed |
| Albright's Supply bungee / shock cord | 3/16 in | 4.76 | — | plastic adjustable hook (one size, fits 3/16, 1/4, 5/16) | listed |
| Albright's Supply bungee / shock cord | 1/4 in | 6.35 | — | metal coil hook 1/4 x 2-7/8 in | listed |
| Albright's Supply bungee / shock cord | 5/16 in | 7.94 | — | plastic adjustable hook (see above) | listed |
| Albright's Supply bungee / shock cord | 3/8 in | 9.52 | — | metal coil hook 3/8 x 2-7/8 in | listed |
| Albright's Supply (hook only) | 1/2 in | 12.70 | — | metal coil hook 1/2 x 2-7/8 in (cord diameter not on the cord list) | hook listed for 1/2 in cord |
| Paracord Planet wire hooks, 10 pc | 3/16 in cord | 4.76 | — | 1/4 in wire hook | hook listed as fitting |
| Paracord Planet wire hooks, 10 pc | 5/16 in cord | 7.94 | — | 5/16 in wire hook | hook listed as fitting |
| Paracord Planet wire hooks, 10 pc | 5/16 in cord | 7.94 | — | 3/8 in wire hook (a reviewer says it is not large enough for 3/8 cord) | hook listed as fitting |
| Paracord Planet wire hooks, 10 pc | 1/2 in cord | 12.70 | — | 1/2 in wire hook | hook listed as fitting |

## Where the files are

- Aircraft Spruce: [Shock cord 1/8, 1/4, 5/16, 3/8, 1/2, 5/8 in; MIL-C-5651D Type I; certifiable sizes 1/4, 3/8, 1/2, 5/8](https://www.aircraftspruce.ca/catalog/lgpages/shockcord.php) — web — Publisher's page; dimensions are facts
- Albright's Supply: [Bungee / shock cord 1/8, 3/16, 1/4, 5/16, 3/8 in and metal coil hooks 1/4, 3/8, 1/2 x 2-7/8 in, plastic adjustable hook](https://www.albrightssupply.com/bungee-shock-cord) — web — Publisher's page; dimensions are facts
- Paracord Planet: [Wire shock cord hooks, 10 pieces: 1/4 in hook for 3/16 cord, 5/16 for 5/16, 3/8 for 5/16, 1/2 for 1/2](https://www.paracordplanet.com/wire-shock-cord-hooks-10-pcs) — web — Publisher's page; dimensions are facts
- McMaster-Carr: [Bungee cord hooks (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/bungee-cord-hooks/) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)

## Questions

**What diameters does shock cord come in?**

1/8, 3/16, 1/4, 5/16, 3/8, 1/2 and 5/8 in across Aircraft Spruce and Albright's; MIL-C-5651D Type I certifiable sizes are 1/4, 3/8, 1/2, 5/8 in.

**What hook goes on 1/4 inch shock cord?**

Albright's lists a 1/4 x 2-7/8 in metal coil hook for 1/4 in cord; Paracord Planet pairs its 1/4 in hook with 3/16 in cord.

**What hook goes on 5/16 inch shock cord?**

Paracord Planet pairs both its 5/16 in and 3/8 in hooks with 5/16 in cord; Albright's plastic adjustable hook also fits 5/16 in.

## Fits with

- [Paracord types (MIL-C-5040 Type I to IV, 95 / 325 / 550 cord): diameter, inner strands and breaking strength](https://xemstudio.com/objects/paracord-types-mil-c-5040/)
- [Double-braid rope diameters (polyester, nylon): 1/4 to 2-5/8 in with weight per 100 ft and minimum break strength](https://xemstudio.com/objects/double-braid-rope-polyester-nylon-diameters/)
- [O-ring cord stock sizes: 0.070 to 0.500 in and 1.5 to 8.4 mm diameters (round), AS568 series cross-reference](https://xemstudio.com/objects/o-ring-cord-stock-sizes/)
- [Wire rope clips: Crosby G-450 U-bolt and G-429 Fist Grip dimensions by rope size, clips required, turn back and torque](https://xemstudio.com/objects/wire-rope-clips-crosby-g450-g429/)
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