# R-clips, spring cotters and hairpin cotter pins: wire diameter, pin / shaft range, length (DIN 11024, McMaster hairpin sizes)

> What size R-clip (hairpin cotter) fits a given clevis pin or shaft, and what is its wire diameter and length?

- Category: Hardware › Fasteners
- Kind: Standard part
- Basis: fasten.it's DIN 11024 table (7 sizes, wire 2.5 to 8 mm) checked against Aspen Fasteners' spec sheet (d1, d2, d3, d4, l agree), fasten.it's second 'commonly used' table, and McMaster-Carr's hairpin cotter pin and hairpin clip tables (zinc-plated spring steel, inch and metric); numbers only
- Page: https://xemstudio.com/objects/r-clips-hairpin-cotters-din-11024/ · JSON: https://xemstudio.com/api/geometry?object=r-clips-hairpin-cotters-din-11024 · Plain text: https://xemstudio.com/objects/r-clips-hairpin-cotters-din-11024/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.** 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

- An R-clip (hairpin cotter pin, spring cotter) is a wire clip that passes through the cross hole of a clevis pin and closes round the outside of the pin; the wire diameter and the pin range it serves are the sizes that matter. DIN 11024 (fasten.it: 'cotter pins, Beta type', 01/1973; the example designation is 'Cotter spring 5 DIN 11024') lists d1 (wire, 2.5 to 8 mm), d2 (the pin / bolt diameter range, over 9 up to 56 mm), d3, d4, l1, l2, l3, h, r1 and r2; the sources do not define the letters beyond d1 as the nominal size and d2 as the range, so d3, d4, l and the rest are shown as printed (Aspen's sheet prints d1, d2, d3, d4 and l and they agree).
- fasten.it also prints a second table of single-coil spring cotters 'commonly used in the market', not part of DIN 11024: wire 2.5 to 9 mm, pin range, d3, d4, l1, l2; it is shown as its own rows.
- McMaster-Carr rows are what McMaster prints under 'For Clevis Pin Dia.', 'Wire Dia.', 'Eye Dia.' and 'Lg.' for zinc-plated spring steel hairpin cotter pins, all rows (inch, then metric, which McMaster lists as DIN 11024 for 9 to 14 mm and 2 mm wire, 57 mm long). McMaster's 18-8 and 316 stainless, 17-7 PH, long-life, cross-leg and mil-spec tables use the same pin ranges with some different wire sizes and lengths; they are not repeated. The hairpin clips table is McMaster's 'shaft dia., wire dia., length, pin opening'. Eye diameter and the lengths differ between the DIN 11024 sizes and McMaster's: for example McMaster's 3 mm wire for 10 to 16 mm pins (72 mm long) is a different wire size from DIN 11024's 3.2 mm for pins over 11.2 to 14 mm (48 mm long), so match the pin range, not the wire.
- Not published as numbers in the sources read: the clip's outline (the bend radii are r1, r2 in the DIN table but the layout is not described). No file is drawn for that reason. Split pins for a cross hole: split-pins-iso-1234; clevis pins: clevis-pins-iso-2341. McMaster-Carr sells R-clips with per-part STEP; its R-clip category is linked, not copied.
- The existing page pins-clevises-and-joints lists R-clips drawn at the split-pin wire sizes (0.8 to 2 mm) for 3 to 8 mm model pins; these are the full-size DIN and catalogue 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 |
|---|---|---|---|---|
| pin diameter range d2 | DIN 11024 wire 2.5 → pins 9 to 11.2, 3.2 → over 11.2 to 14, 4 → over 14 to 20, 5 → over 20 to 26, 6.3 → over 26 to 34, 7 → over 34 to 45, 8 → over 45 to 56 mm | clevis pin of that diameter (ISO 2341 d on clevis-pins-iso-2341), clip through its cross hole | designed | all |

## Sizes

| table | wire diameter | pin (clevis pin) diameter range, as printed | d3 / d4 / eye / pin opening | lengths and other dimensions |
|---|---|---|---|---|
| DIN 11024 (fasten.it; Aspen agrees on d1, d2, d3, d4, l) | 2.5 wire | 9 to 11.2 mm | d3 2.25, d4 20 | l 42; l2 24, l3 5.5; h 2.5; r1 5.6, r2 4 |
| DIN 11024 (fasten.it; Aspen agrees on d1, d2, d3, d4, l) | 3.2 wire | over 11.2 to 14 mm | d3 2.8, d4 20 | l 48; l2 26, l3 7; h 3; r1 7, r2 5 |
| DIN 11024 (fasten.it; Aspen agrees on d1, d2, d3, d4, l) | 4 wire | over 14 to 20 mm | d3 3.6, d4 20 | l 64; l2 32, l3 10; h 4.5; r1 10, r2 6.5 |
| DIN 11024 (fasten.it; Aspen agrees on d1, d2, d3, d4, l) | 5 wire | over 20 to 26 mm | d3 4.5, d4 25 | l 80; l2 39, l3 12.5; h 7; r1 13, r2 8 |
| DIN 11024 (fasten.it; Aspen agrees on d1, d2, d3, d4, l) | 6.3 wire | over 26 to 34 mm | d3 5.6, d4 25 | l 97; l2 45, l3 16; h 9; r1 17, r2 10 |
| DIN 11024 (fasten.it; Aspen agrees on d1, d2, d3, d4, l) | 7 wire | over 34 to 45 mm | d3 6.3, d4 30 | l 125; l2 56, l3 21; h 12.5; r1 22.5, r2 11.5 |
| DIN 11024 (fasten.it; Aspen agrees on d1, d2, d3, d4, l) | 8 wire | over 45 to 56 mm | d3 7, d4 30 | l 150; l2 63, l3 25.5; h 17.5; r1 28, r2 12.5 |
| single-coil spring cotter, 'commonly used in the market' (fasten.it, not DIN) | 2.5 wire | over 9 to 14 mm | d3 2, d4 10 | l1 50; l2 25 |
| single-coil spring cotter, 'commonly used in the market' (fasten.it, not DIN) | 3.5 wire | over 10 to 16 mm | d3 3, d4 18 | l1 60; l2 28 |
| single-coil spring cotter, 'commonly used in the market' (fasten.it, not DIN) | 4.5 wire | over 16 to 20 mm | d3 4, d4 20 | l1 60; l2 30 |
| single-coil spring cotter, 'commonly used in the market' (fasten.it, not DIN) | 6 wire | over 20 to 28 mm | d3 5, d4 24 | l1 85; l2 40 |
| single-coil spring cotter, 'commonly used in the market' (fasten.it, not DIN) | 7 wire | over 28 to 40 mm | d3 6, d4 30 | l1 105; l2 50 |
| single-coil spring cotter, 'commonly used in the market' (fasten.it, not DIN) | 8 wire | over 28 to 45 mm | d3 7, d4 30 | l1 105; l2 50 |
| single-coil spring cotter, 'commonly used in the market' (fasten.it, not DIN) | 9 wire | over 30 to 45 mm | d3 8, d4 30 | l1 110; l2 55 |
| McMaster hairpin cotter, zinc-plated spring steel | 3/64" wire | 1/16" to 1/8" | eye 1/8" | length 7/16" |
| McMaster hairpin cotter, zinc-plated spring steel | 1/32" wire | 7/64" to 9/64" | eye 1/8" | length 7/16" |
| McMaster hairpin cotter, zinc-plated spring steel | 1/32" wire | 1/8" | eye 1/8" | length 5/8" |
| McMaster hairpin cotter, zinc-plated spring steel | 1/32" wire | 1/8" to 5/32" | eye 1/8" | length 9/16" |
| McMaster hairpin cotter, zinc-plated spring steel | 3/64" wire | 1/8" to 3/16" | eye 1/8" | length 5/8" |
| McMaster hairpin cotter, zinc-plated spring steel | 3/64" wire | 3/16" to 1/4" | eye 1/8" | length 3/4" |
| McMaster hairpin cotter, zinc-plated spring steel | 3/64" wire | 3/16" to 1/4" | eye 1/4" | length 15/16" |
| McMaster hairpin cotter, zinc-plated spring steel | 3/64" wire | 3/16" to 1/4" | eye 1/4" | length 1" |
| McMaster hairpin cotter, zinc-plated spring steel | 1/16" wire | 1/4" to 5/16" | eye 1/4" | length 1 1/8" |
| McMaster hairpin cotter, zinc-plated spring steel | 3/64" wire | 1/4" to 3/8" | eye 1/8" | length 7/8" |
| McMaster hairpin cotter, zinc-plated spring steel | 3/64" wire | 1/4" to 3/8" | eye 1/4" | length 1 9/16" |
| McMaster hairpin cotter, zinc-plated spring steel | 5/64" wire | 1/4" to 3/8" | eye 1/4" | length 1 3/16" |
| McMaster hairpin cotter, zinc-plated spring steel | 1/16" wire | 1/4" to 1/2" | eye 1/4" | length 1 5/16" |
| McMaster hairpin cotter, zinc-plated spring steel | 3/32" wire | 1/4" to 1/2" | eye 3/8" | length 1 5/8" |
| McMaster hairpin cotter, zinc-plated spring steel | 5/64" wire | 5/16" to 3/8" | eye 1/8" | length 1 1/16" |
| McMaster hairpin cotter, zinc-plated spring steel | 5/64" wire | 5/16" to 3/8" | eye 1/4" | length 1 7/16" |
| McMaster hairpin cotter, zinc-plated spring steel | 3/32" wire | 5/16" to 3/8" | eye 3/8" | length 1 5/8" |
| McMaster hairpin cotter, zinc-plated spring steel | 7/64" wire | 5/16" to 3/8" | eye 1/8" | length 1 1/4" |
| McMaster hairpin cotter, zinc-plated spring steel | 3/32" wire | 5/16" to 1/2" | eye 5/8" | length 2" |
| McMaster hairpin cotter, zinc-plated spring steel | 3/32" wire | 3/8" to 7/16" | eye 5/8" | length 1 7/8" |
| McMaster hairpin cotter, zinc-plated spring steel | 1/16" wire | 3/8" to 1/2" | eye 3/8" | length 1 9/16" |
| McMaster hairpin cotter, zinc-plated spring steel | 5/64" wire | 3/8" to 1/2" | eye 3/8" | length 1 9/16" |
| McMaster hairpin cotter, zinc-plated spring steel | 3/32" wire | 3/8" to 5/8" | eye 5/8" | length 2 5/16" |
| McMaster hairpin cotter, zinc-plated spring steel | 1/8" wire | 7/16" to 3/4" | eye 1/2" | length 2 9/16" |
| McMaster hairpin cotter, zinc-plated spring steel | 1/8" wire | 1/2" to 5/8" | eye 5/8" | length 2 3/8" |
| McMaster hairpin cotter, zinc-plated spring steel | 3/32" wire | 1/2" to 3/4" | eye 1/2" | length 2 1/2" |
| McMaster hairpin cotter, zinc-plated spring steel | 1/8" wire | 1/2" to 3/4" | eye 3/8" | length 1 15/16" |
| McMaster hairpin cotter, zinc-plated spring steel | 1/8" wire | 1/2" to 3/4" | eye 1/2" | length 1 9/16" |
| McMaster hairpin cotter, zinc-plated spring steel | 9/64" wire | 5/8" to 3/4" | eye 3/4" | length 2 9/16" |
| McMaster hairpin cotter, zinc-plated spring steel | 1/8" wire | 5/8" to 7/8" | eye 5/8" | length 2 1/2" |
| McMaster hairpin cotter, zinc-plated spring steel | 9/64" wire | 5/8" to 1" | eye 3/4" | length 2 15/16" |
| McMaster hairpin cotter, zinc-plated spring steel | 11/64" wire | 5/8" to 1" | eye 7/8" | length 3 1/4" |
| McMaster hairpin cotter, zinc-plated spring steel | 11/64" wire | 3/4" to 1 1/16" | eye 7/8" | length 3 1/2" |
| McMaster hairpin cotter, zinc-plated spring steel | 1/8" wire | 3/4" to 1 1/8" | eye 1" | length 3 1/8" |
| McMaster hairpin cotter, zinc-plated spring steel | 9/64" wire | 3/4" to 1 1/8" | eye 3/4" | length 3 5/16" |
| McMaster hairpin cotter, zinc-plated spring steel | 11/64" wire | 7/8" to 1" | eye 1" | length 3 3/4" |
| McMaster hairpin cotter, zinc-plated spring steel | 5/16" wire | 7/8" to 1" | eye 7/8" | length 4 1/16" |
| McMaster hairpin cotter, zinc-plated spring steel | 5/32" wire | 7/8" to 1 1/16" | eye 7/8" | length 2 3/16" |
| McMaster hairpin cotter, zinc-plated spring steel | 11/64" wire | 7/8" to 1 1/4" | eye 7/8" | length 3 3/4" |
| McMaster hairpin cotter, zinc-plated spring steel | 15/64" wire | 1 1/8" to 1 1/2" | eye 1 1/8" | length 5" |
| McMaster hairpin cotter, zinc-plated spring steel | 1/4" wire | 1 1/8" to 1 1/2" | eye 7/8" | length 4" |
| McMaster hairpin cotter, zinc-plated spring steel | 2 mm wire | 6 mm to 11 mm | eye 10 mm | length 50 mm |
| McMaster hairpin cotter, zinc-plated spring steel | 2 mm wire | 9 mm to 14 mm | eye 10 mm | length 57 mm |
| McMaster hairpin cotter, zinc-plated spring steel | 2.5 mm wire | 9 mm to 14 mm | eye 10 mm | length 50 mm |
| McMaster hairpin cotter, zinc-plated spring steel | 3 mm wire | 10 mm to 16 mm | eye 18 mm | length 72 mm |
| McMaster hairpin cotter, zinc-plated spring steel | 3.5 mm wire | 10 mm to 16 mm | eye 18 mm | length 70 mm |
| McMaster hairpin cotter, zinc-plated spring steel | 4 mm wire | 16 mm to 20 mm | eye 20 mm | length 74 mm |
| McMaster hairpin cotter, zinc-plated spring steel | 4 mm wire | 16 mm to 20 mm | eye 21 mm | length 85 mm |
| McMaster hairpin cotter, zinc-plated spring steel | 4.5 mm wire | 16 mm to 26 mm | eye 21 mm | length 82 mm |
| McMaster hairpin cotter, zinc-plated spring steel | 5 mm wire | 20 mm to 28 mm | eye 24 mm | length 85 mm |
| McMaster hairpin cotter, zinc-plated spring steel | 5 mm wire | 20 mm to 28 mm | eye 24 mm | length 102 mm |
| McMaster hairpin cotter, zinc-plated spring steel | 6 mm wire | 28 mm to 40 mm | eye 24 mm | length 105 mm |
| McMaster hairpin cotter, zinc-plated spring steel | 6 mm wire | 28 mm to 40 mm | eye 30 mm | length 126 mm |
| McMaster hairpin cotter, zinc-plated spring steel | 7 mm wire | 28 mm to 45 mm | eye 30 mm | length 105 mm |
| McMaster hairpin cotter, zinc-plated spring steel | 7 mm wire | 28 mm to 45 mm | eye 30 mm | length 127 mm |
| McMaster hairpin cotter, zinc-plated spring steel | 8 mm wire | 30 mm to 45 mm | eye 28 mm | length 110 mm |
| McMaster hairpin cotter, zinc-plated spring steel | 8 mm wire | 30 mm to 45 mm | eye 28 mm | length 132 mm |
| McMaster hairpin clip (zinc-plated spring steel; 18-8 stainless same sizes) | 1/32" wire | shaft 1/8" | pin opening 5/64" | length 3/8" |
| McMaster hairpin clip (zinc-plated spring steel; 18-8 stainless same sizes) | 1/32" wire | shaft 3/16" | pin opening 9/64" | length 1/2" |
| McMaster hairpin clip (zinc-plated spring steel; 18-8 stainless same sizes) | 1/32" wire | shaft 1/4" | pin opening 7/32" | length 5/8" |
| McMaster hairpin clip (zinc-plated spring steel; 18-8 stainless same sizes) | 3/64" wire | shaft 5/16" | pin opening 1/4" | length 3/4" |
| McMaster hairpin clip (zinc-plated spring steel; 18-8 stainless same sizes) | 3/64" wire | shaft 3/8" | pin opening 5/16" | length 1" |
| McMaster hairpin clip (zinc-plated spring steel; 18-8 stainless same sizes) | 1/16" wire | shaft 7/16" | pin opening 3/8" | length 1 1/8" |
| McMaster hairpin clip (zinc-plated spring steel; 18-8 stainless same sizes) | 1/16" wire | shaft 1/2" | pin opening 7/16" | length 1 1/8" |
| McMaster hairpin clip (zinc-plated spring steel; 18-8 stainless same sizes) | 3/32" wire | shaft 5/8" | pin opening 17/32" | length 1 1/2" |
| McMaster hairpin clip (zinc-plated spring steel; 18-8 stainless same sizes) | 3/32" wire | shaft 3/4" | pin opening 21/32" | length 1 7/8" |
| McMaster hairpin clip (zinc-plated spring steel; 18-8 stainless same sizes) | 7/64" wire | shaft 7/8" | pin opening 25/32" | length 2 1/8" |
| McMaster hairpin clip (zinc-plated spring steel; 18-8 stainless same sizes) | 1/8" wire | shaft 1" | pin opening 7/8" | length 2 3/8" |

## Where the files are

- Aspen Fasteners: [Metric DIN 11024 spec: d1, d2, d3, d4, l for the 2.5 to 8 mm spring cotters (the page does not define the letters)](https://www.aspenfasteners.com/v/vspfiles/files/docs/Metric_DIN_11024_spec.pdf) — web — Maker data sheet; numbers only
- fasten.it: [DIN 11024 cotter pins, Beta type (spring cotters), 01/1973: d1, d2, d3, d4, l1, l2, l3, h, r1, r2, weight; a second 'commonly used' single-coil table](https://fasten.it/norms/norm/din_11024) — web — Reference page; numbers only
- McMaster-Carr: [R-clips and hairpin cotter pins / hairpin clips (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/r-clips) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)

## Questions

**What R-clip fits a 1/2 in clevis pin?**

McMaster's zinc-plated hairpin cotters list several for 1/2 in: 1/4 to 1/2 in pins with 1/16 or 3/32 in wire (1-5/16 or 1-5/8 in long), 3/8 to 1/2 in with 1/16 or 5/64 in wire, 1/2 to 5/8 in with 1/8 in wire (2-3/8 in), 1/2 to 3/4 in with 3/32 or 1/8 in wire.

**What is the DIN 11024 size for a 12 mm pin?**

d2 'over 11.2 to 14' mm is the 3.2 mm wire size (l 48 mm); a 10 mm pin falls in the 2.5 mm size (d2 9 to 11.2 mm, l 42 mm).

**Is an R-clip the same as a split pin?**

No: a split pin (ISO 1234) goes through a cross hole and its legs are bent over; an R-clip passes through the hole and its bow springs round the outside of the pin.

## Fits with

- [Split pins (cotter pins) ISO 1234 / DIN 94, 0.6–20: hole size, wire diameter d, a, b, c and the bolt and clevis-pin size each one serves](https://xemstudio.com/objects/split-pins-iso-1234/)
- [Clevis pins with head, ISO 2341 (DIN 1444) forms A and B, d 3–100: head diameter and height, split-pin hole, le, radius + example pin models](https://xemstudio.com/objects/clevis-pins-iso-2341/)
- [Clevis pins ISO 2341 B, Ø3 to Ø8](https://xemstudio.com/objects/clevis-pins/)
- [E-clips DIN 6799 for Ø2 to Ø10 shafts](https://xemstudio.com/objects/e-clips-din-6799/)
- [Retaining rings DIN 471 (external, for shafts): ring dimensions and groove diameter d2 × width m, 3 to 100 mm](https://xemstudio.com/objects/retaining-rings-din-471-external/)
- [Metric shafts Ø3 to Ø10 with D-flats and clip grooves](https://xemstudio.com/objects/metric-shafts/)