# Crosby H-331 / A-331 clevis slip hooks and H-324 eye slip hooks: working load limit and dimensions, 1/4 to 3/4 in chain size

> What are the dimensions and working load limit of a Crosby A-331 clevis slip hook?

- Category: Hardware › Rigging & lifting
- Kind: Standard part
- Basis: Crosby's H-331 / A-331 / H-324 data sheet (a distributor's copy), read in this session; numbers only (the sheet's drawing letters are not defined in text)
- Page: https://xemstudio.com/objects/slip-hooks-crosby-h331-a331/ · JSON: https://xemstudio.com/api/geometry?object=slip-hooks-crosby-h331-a331 · Plain text: https://xemstudio.com/objects/slip-hooks-crosby-h331-a331/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
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**Exact dimensions.** True size, with no tolerance added.

## Notes

- A slip hook has an open throat with no latch, for chain and tie-down work. Tables as printed: chain size in inches, WLL in lb, dimensions in inches, weight in lb. For clevis hooks the first WLL is carbon steel H-331 and the second alloy A-331 (A-331 has no 3/4 in carbon size on the sheet; shown '—'). Eye slip hooks H-324 are carbon steel only; they have no P or T column, so those cells are '—'.
- Letters A to T are the sheet's own; the drawing is an image and the text does not define them, so no letter is interpreted. The sheet's footnote: ultimate load is 4 times the WLL, and these hooks are not suitable for Grade 80 chain and chain slings in overhead lifting (the sheet points to Grade 80 or 100 alloy components for those).
- No file: hook throat and clevis shape are not defined by published numbers (undefined letters, no profile), so a model would be invented. Shackles are on shackles-bow-d-crosby-g209-g210-g2130.
- McMaster-Carr's hook category is linked for per-part STEP; nothing is copied.

## Sizes

| hook | chain size (in) | WLL (lb) | weight each (lb) | A | B | C | D | E | F | G | H | K | L | N | P | R | T |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| clevis slip hook H-331 (carbon) / A-331 (alloy) | 1/4 | 1950 / 2750 | .55 | 1.06 | .32 | .29 | 2.75 | .94 | 1.19 | .81 | .88 | .50 | 3.95 | 2.13 | .31 | 2.58 | .81 |
| clevis slip hook H-331 (carbon) / A-331 (alloy) | 5/16 | 2875 / 4300 | .79 | 1.22 | .43 | .34 | 3.06 | 1.06 | 1.25 | .94 | 1.00 | .56 | 4.52 | 2.25 | .38 | 2.87 | .97 |
| clevis slip hook H-331 (carbon) / A-331 (alloy) | 3/8 | 4000 / 5250 | 1.21 | 1.38 | .45 | .44 | 3.63 | 1.31 | 1.50 | 1.13 | 1.19 | .66 | 5.15 | 2.56 | .44 | 3.25 | 1.06 |
| clevis slip hook H-331 (carbon) / A-331 (alloy) | 7/16 | 5000 / 7000 | 2.06 | 1.73 | .59 | .60 | 4.34 | 1.56 | 1.81 | 1.38 | 1.44 | .81 | 5.97 | 3.06 | .56 | 3.70 | 1.19 |
| clevis slip hook H-331 (carbon) / A-331 (alloy) | 1/2 | 6500 / 9000 | 2.75 | 1.88 | .57 | .53 | 4.81 | 1.69 | 1.94 | 1.56 | 1.63 | .91 | 6.53 | 3.44 | .63 | 4.00 | 1.31 |
| clevis slip hook H-331 (carbon) / A-331 (alloy) | 5/8 | 9250 / 13500 | 4.75 | 2.31 | .71 | .71 | 5.63 | 2.00 | 2.38 | 1.81 | 1.94 | 1.09 | 7.89 | 4.00 | .75 | 4.94 | 1.56 |
| clevis slip hook H-331 (carbon) / A-331 (alloy) | 3/4 | — / 19250 | 11.28 | 3.19 | 1.18 | 1.29 | 7.38 | 2.50 | 3.00 | 2.38 | 2.50 | 1.44 | 10.02 | 5.06 | 1.00 | 6.09 | 2.09 |
| eye slip hook H-324 (carbon) | 1/4 | 1950 | .40 | 1.06 | .50 | .28 | 2.75 | .94 | 1.19 | .81 | .88 | .50 | 3.66 | 2.13 | — | 2.56 | — |
| eye slip hook H-324 (carbon) | 5/16 | 2875 | .64 | 1.25 | .63 | .34 | 3.06 | 1.06 | 1.25 | .94 | 1.00 | .56 | 4.23 | 2.25 | — | 2.95 | — |
| eye slip hook H-324 (carbon) | 3/8 | 4000 | 1.10 | 1.53 | .72 | .41 | 3.63 | 1.31 | 1.50 | 1.13 | 1.19 | .66 | 4.89 | 2.56 | — | 3.36 | — |
| eye slip hook H-324 (carbon) | 7/16 | 5000 | 1.56 | 1.69 | .81 | .44 | 4.34 | 1.56 | 1.81 | 1.38 | 1.44 | .81 | 5.70 | 3.06 | — | 3.88 | — |
| eye slip hook H-324 (carbon) | 1/2 | 6500 | 2.09 | 1.94 | .94 | .50 | 4.81 | 1.69 | 1.94 | 1.56 | 1.63 | .91 | 6.34 | 3.44 | — | 4.28 | — |
| eye slip hook H-324 (carbon) | 5/8 | 9250 | 3.90 | 2.38 | 1.13 | .63 | 5.63 | 2.00 | 2.38 | 1.81 | 1.94 | 1.09 | 7.66 | 4.00 | — | 5.22 | — |
| eye slip hook H-324 (carbon) | 3/4 | 12500 | 6.93 | 2.88 | 1.38 | .75 | 6.75 | 2.13 | 2.75 | 2.19 | 2.31 | 1.31 | 8.73 | 4.75 | — | 5.80 | — |

## Where the files are

- The Crosby Group (via M.E. Campbell copy): [H-331 / A-331 clevis slip hooks and H-324 eye slip hooks: chain size, stock numbers, WLL, weight, A to T](https://www.mecampbell.com/media/pdf/THECRSE00013_250.pdf) — web — Maker data sheet copy; numbers only. Letters are the sheet's own; its drawing is an image
- McMaster-Carr: [Hooks (slip, grab, sling) (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/hooks/) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)

## Questions

**What is the WLL of a 3/8 in Crosby A-331 slip hook?**

5250 lb for alloy A-331 and 4000 lb for carbon H-331, on the data sheet read.

**What is the WLL of a 1/2 in A-331 clevis slip hook?**

9000 lb (alloy); the carbon H-331 is 6500 lb.

**Is an A-331 slip hook for lifting?**

The sheet says H-331 / H-324 slip hooks are not suitable for Grade 80 chain slings in overhead lifting; use the maker's rated components.

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