Bungee / shock cord diameters (1/8 to 5/8 in) and the hook sizes that go with them — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/bungee-shock-cord-diameters-and-hooks/ (sheet CC BY 4.0) 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 Catalog version: 2026-10-20 Sizes: see table below - 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. 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 Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - 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 — web — Publisher's page; dimensions are facts — https://www.aircraftspruce.ca/catalog/lgpages/shockcord.php - 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 — web — Publisher's page; dimensions are facts — https://www.albrightssupply.com/bungee-shock-cord - 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 — web — Publisher's page; dimensions are facts — https://www.paracordplanet.com/wire-shock-cord-hooks-10-pcs - McMaster-Carr: Bungee cord hooks (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/products/bungee-cord-hooks/ No true-size file yet: the published figures do not fix the whole shape; a measured scan is planned. 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