# Spring pins: slotted (ISO 8752, ASME B18.8.2) and coiled (ISO 8750): diameter, wall, chamfer, hole size, shear + hole gauges

> What hole size does a slotted or coiled spring pin need, and what are its diameter, wall and chamfer?

- Category: Hardware › Fasteners
- Kind: Standard part
- Basis: Westfield Fasteners' ISO 8752 and ISO 8750 tables (checked against iTeh's ISO sample pages), SPIROL's inch ASME B18.8.2 slotted-pin sheet, SPIROL's 5 mm metric listing, and McMaster-Carr's spring-pin tables as cross-checks; two hole gauges as files
- Page: https://xemstudio.com/objects/spring-pins-iso-8752-8750-asme-b18-8-2/ · JSON: https://xemstudio.com/api/geometry?object=spring-pins-iso-8752-8750-asme-b18-8-2 · Plain text: https://xemstudio.com/objects/spring-pins-iso-8752-8750-asme-b18-8-2/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/)

## Overall (mm)

| length | width | height |
|---|---|---|
| 98.3 | 20.7 | 3.0 |

**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

- ISO 8752 (slotted, replaces DIN 1481, 1 to 50 mm) and ISO 8750 (coiled, standard duty, 0.8 to 20 mm) are tabulated in mm. Columns: pin diameter before mounting max / min (the nominal d1 is the hole), d2 (reference only, as printed), a (chamfer length, max / min for ISO 8752), s (wall, from the table), and minimum double-shear force in kN for steel and martensitic stainless. For ISO 8750 the standard's austenitic stainless shear values are also shown. iTeh's ISO sample pages agree with Westfield on d1, d2, s and shear (and on a for ISO 8752) for the sizes read (ISO 8752: 3, 4, 5, 6, 8, 10, 12; ISO 8750: 2, 3, 4, 5, 6, 8, 10, 12, 16, 20). Westfield's 8752 table prints 22.5 kN for d1 = 18, out of line with its neighbours, so that value is left out. The reading of 'a' as a chamfer length follows ISO 8750's figure note (swaged chamfer, 'a ≈') and, for ISO 8752, matches SPIROL's printed 0.90–1.10 mm chamfer for the 5 mm pin (a 1.1 / 0.9); it was checked at that one size only.
- Hole: both ISO standards say the hole should equal the nominal pin diameter d1 with tolerance class H12 (ISO 286-2; H10 for ISO 8750 pins of 1.2 mm and below); in the smallest permitted hole the slot should not close completely. SPIROL's 5 mm listing prints 5.00–5.12 mm. McMaster-Carr's tables print wider ranges for the ISO 8752 pins it sells (for example 5 to 5.2 mm, 8 to 8.25 mm, 10 to 10.3 mm) and, for coiled pins, 5.000–5.100 mm; use the range of the pin you buy.
- Inch rows are SPIROL's ASME B18.8.2 slotted spring pin sheet (inches): nominal diameter, pin diameter D max / min, chamfer diameter B max, chamfer length C max / min, wall S (nominal), recommended hole max / min, and minimum double shear in lbf / kN. McMaster-Carr's inch tables agree on hole ranges and wall for the sizes checked: 1/16 in hole 0.062–0.065 in, wall 0.012 in; 1/8 in 0.125–0.129, wall 0.028; 1/4 in 0.250–0.256, wall 0.048; McMaster also prints a 1/16 in coiled pin at 0.061–0.065 in hole. Inch coiled pins (ASME B18.8.3 / B18.8.4 heavy-duty families) and ISO 13337 / DIN 7346 (light duty) were not tabulated: no source with checkable dimensions was read.
- Not published as numbers in the sources read: the slot width of a slotted pin before or after mounting. No pin model is drawn for that reason. The files are hole gauges: plates with the published nominal holes. Metric gauge: 2, 3, 4, 5, 6, 8, 10, 12 mm (hole = nominal d1, the lower limit of H12). Inch gauge: the lower limit of SPIROL's recommended hole range. Plate thickness, spacing and corner radius are Xem's choices.
- Clevis pins, R-clips and cotter pins are on the page pins-clevises-and-joints (it does not cover spring or roll pins); dowel pins: dowel-pins-metric. McMaster-Carr sells spring pins with per-part STEP; its slotted, coiled and metric roll-pin pages are 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 |
|---|---|---|---|---|
| pin | ISO 8752 slotted 1–50 mm; ISO 8750 coiled 0.8–20 mm; pin Ø before mounting e.g. 3 mm → 3.5 / 3.3 | hole = nominal d1, H12 (H10 for ISO 8750 pins of 1.2 mm and below); SPIROL 5 mm: 5.00–5.12 | press | spring-pin-hole-gauge* |

## Sizes

| standard | nominal | pin dia before mounting max / min | d2 (ref.) and chamfer a, or inch B / C | wall s | hole | min double shear |
|---|---|---|---|---|---|---|
| ISO 8752 slotted | 1 mm | 1.3 / 1.2 | d2 0.8; a 0.35 / 0.15 | 0.2 | nominal d1, H12 | 0.7 kN (steel, martensitic stainless) |
| ISO 8752 slotted | 1.5 mm | 1.8 / 1.7 | d2 1.1; a 0.45 / 0.25 | 0.3 | nominal d1, H12 | 1.58 kN (steel, martensitic stainless) |
| ISO 8752 slotted | 2 mm | 2.4 / 2.3 | d2 1.5; a 0.55 / 0.35 | 0.4 | nominal d1, H12 | 2.82 kN (steel, martensitic stainless) |
| ISO 8752 slotted | 2.5 mm | 2.9 / 2.8 | d2 1.8; a 0.6 / 0.4 | 0.5 | nominal d1, H12 | 4.38 kN (steel, martensitic stainless) |
| ISO 8752 slotted | 3 mm | 3.5 / 3.3 | d2 2.1; a 0.7 / 0.5 | 0.6 | nominal d1, H12 | 6.32 kN (steel, martensitic stainless) |
| ISO 8752 slotted | 3.5 mm | 4.0 / 3.8 | d2 2.3; a 0.8 / 0.6 | 0.75 | nominal d1, H12 | 9.06 kN (steel, martensitic stainless) |
| ISO 8752 slotted | 4 mm | 4.6 / 4.4 | d2 2.8; a 0.85 / 0.65 | 0.8 | nominal d1, H12 | 11.24 kN (steel, martensitic stainless) |
| ISO 8752 slotted | 4.5 mm | 5.1 / 4.9 | d2 2.9; a 1.0 / 0.8 | 1.0 | nominal d1, H12 | 15.36 kN (steel, martensitic stainless) |
| ISO 8752 slotted | 5 mm | 5.6 / 5.4 | d2 3.4; a 1.1 / 0.9 | 1.0 | nominal d1, H12 | 17.54 kN (steel, martensitic stainless) |
| ISO 8752 slotted | 6 mm | 6.7 / 6.4 | d2 4.0; a 1.4 / 1.2 | 1.2 | nominal d1, H12 | 26.04 kN (steel, martensitic stainless) |
| ISO 8752 slotted | 8 mm | 8.8 / 8.5 | d2 5.5; a 2.0 / 1.6 | 1.5 | nominal d1, H12 | 42.76 kN (steel, martensitic stainless) |
| ISO 8752 slotted | 10 mm | 10.8 / 10.5 | d2 6.5; a 2.4 / 2.0 | 2.0 | nominal d1, H12 | 70.16 kN (steel, martensitic stainless) |
| ISO 8752 slotted | 12 mm | 12.8 / 12.5 | d2 7.5; a 2.4 / 2.0 | 2.5 | nominal d1, H12 | 104.1 kN (steel, martensitic stainless) |
| ISO 8752 slotted | 13 mm | 13.8 / 13.5 | d2 8.5; a 2.4 / 2.0 | 2.5 | nominal d1, H12 | 115.1 kN (steel, martensitic stainless) |
| ISO 8752 slotted | 14 mm | 14.8 / 14.5 | d2 8.5; a 2.4 / 2.0 | 3.0 | nominal d1, H12 | 144.7 kN (steel, martensitic stainless) |
| ISO 8752 slotted | 16 mm | 16.8 / 16.5 | d2 10.5; a 2.4 / 2.0 | 3.0 | nominal d1, H12 | 171.0 kN (steel, martensitic stainless) |
| ISO 8752 slotted | 18 mm | 18.9 / 18.5 | d2 11.5; a 2.4 / 2.0 | 3.5 | nominal d1, H12 | — (Westfield's 22.5 breaks the progression; not used) kN (steel, martensitic stainless) |
| ISO 8752 slotted | 20 mm | 20.9 / 20.5 | d2 12.5; a 3.4 / 3.0 | 4.0 | nominal d1, H12 | 280.6 kN (steel, martensitic stainless) |
| ISO 8752 slotted | 21 mm | 21.9 / 21.5 | d2 13.5; a 3.4 / 3.0 | 4.0 | nominal d1, H12 | 298.2 kN (steel, martensitic stainless) |
| ISO 8752 slotted | 25 mm | 25.9 / 25.5 | d2 15.5; a 3.4 / 3.0 | 5.0 | nominal d1, H12 | 438.5 kN (steel, martensitic stainless) |
| ISO 8752 slotted | 28 mm | 28.9 / 28.5 | d2 17.5; a 3.4 / 3.0 | 5.5 | nominal d1, H12 | 542.6 kN (steel, martensitic stainless) |
| ISO 8752 slotted | 30 mm | 30.9 / 30.5 | d2 18.5; a 3.4 / 3.0 | 6.0 | nominal d1, H12 | 631.4 kN (steel, martensitic stainless) |
| ISO 8752 slotted | 32 mm | 32.9 / 32.5 | d2 20.5; a 3.6 / 3.0 | 6.0 | nominal d1, H12 | 684 kN (steel, martensitic stainless) |
| ISO 8752 slotted | 35 mm | 35.9 / 35.5 | d2 21.5; a 3.6 / 3.0 | 7.0 | nominal d1, H12 | 859 kN (steel, martensitic stainless) |
| ISO 8752 slotted | 38 mm | 38.9 / 38.5 | d2 23.5; a 4.6 / 4.0 | 7.5 | nominal d1, H12 | 1003 kN (steel, martensitic stainless) |
| ISO 8752 slotted | 40 mm | 40.9 / 40.5 | d2 25.5; a 4.6 / 4.0 | 7.5 | nominal d1, H12 | 1068 kN (steel, martensitic stainless) |
| ISO 8752 slotted | 45 mm | 45.9 / 45.5 | d2 28.5; a 4.6 / 4.0 | 8.5 | nominal d1, H12 | 1360 kN (steel, martensitic stainless) |
| ISO 8752 slotted | 50 mm | 50.9 / 50.5 | d2 31.5; a 4.6 / 4.0 | 9.5 | nominal d1, H12 | 1685 kN (steel, martensitic stainless) |
| ISO 8750 coiled | 0.8 mm | 0.91 / 0.85 | d2 max 0.75; a 0.3 | 0.07 | nominal d1, H12 | 0.4 kN steel; 0.3 kN austenitic stainless |
| ISO 8750 coiled | 1 mm | 1.15 / 1.05 | d2 max 0.95; a 0.3 | 0.08 | nominal d1, H12 | 0.6 kN steel; 0.45 kN austenitic stainless |
| ISO 8750 coiled | 1.2 mm | 1.35 / 1.25 | d2 max 1.15; a 0.4 | 0.10 | nominal d1, H12 | 0.9 kN steel; 0.65 kN austenitic stainless |
| ISO 8750 coiled | 1.5 mm | 1.75 / 1.62 | d2 max 1.40; a 0.5 | 0.13 | nominal d1, H12 | 1.45 kN steel; 1.05 kN austenitic stainless |
| ISO 8750 coiled | 2 mm | 2.25 / 2.13 | d2 max 1.90; a 0.7 | 0.17 | nominal d1, H12 | 2.5 kN steel; 1.9 kN austenitic stainless |
| ISO 8750 coiled | 2.5 mm | 2.78 / 2.65 | d2 max 2.40; a 0.7 | 0.21 | nominal d1, H12 | 3.9 kN steel; 2.9 kN austenitic stainless |
| ISO 8750 coiled | 3 mm | 3.30 / 3.15 | d2 max 2.90; a 0.9 | 0.25 | nominal d1, H12 | 5.5 kN steel; 4.2 kN austenitic stainless |
| ISO 8750 coiled | 3.5 mm | 3.84 / 3.67 | d2 max 3.40; a 1 | 0.29 | nominal d1, H12 | 7.5 kN steel; 5.7 kN austenitic stainless |
| ISO 8750 coiled | 4 mm | 4.40 / 4.20 | d2 max 3.90; a 1.1 | 0.33 | nominal d1, H12 | 9.6 kN steel; 7.6 kN austenitic stainless |
| ISO 8750 coiled | 5 mm | 5.50 / 5.25 | d2 max 4.85; a 1.3 | 0.42 | nominal d1, H12 | 15 kN steel; 11.5 kN austenitic stainless |
| ISO 8750 coiled | 6 mm | 6.50 / 6.25 | d2 max 5.85; a 1.5 | 0.50 | nominal d1, H12 | 22 kN steel; 16.8 kN austenitic stainless |
| ISO 8750 coiled | 8 mm | 8.63 / 8.30 | d2 max 7.80; a 2 | 0.67 | nominal d1, H12 | 39 kN steel; 30 kN austenitic stainless |
| ISO 8750 coiled | 10 mm | 10.80 / 10.35 | d2 max 9.75; a 2.5 | 0.84 | nominal d1, H12 | 62 kN steel; 48 kN austenitic stainless |
| ISO 8750 coiled | 12 mm | 12.85 / 12.40 | d2 max 11.70; a 3 | 1 | nominal d1, H12 | 89 kN steel; 67 kN austenitic stainless |
| ISO 8750 coiled | 14 mm | 14.95 / 14.45 | d2 max 13.60; a 3.5 | 1.20 | nominal d1, H12 | 120 kN steel; — kN austenitic stainless |
| ISO 8750 coiled | 16 mm | 17.00 / 16.45 | d2 max 15.60; a 4 | 1.30 | nominal d1, H12 | 155 kN steel; — kN austenitic stainless |
| ISO 8750 coiled | 20 mm | 21.10 / 20.40 | d2 max 19.60; a 4.5 | 1.70 | nominal d1, H12 | 250 kN steel; — kN austenitic stainless |
| ASME B18.8.2 slotted (inch, SPIROL) | 1/16 (.062) in | .069 / .066 | B max .059; C .028 / .007 | .012 | .065 / .062 in | 430 / 1.91 lb / kN carbon & martensitic; 250 / 1.11 austenitic |
| ASME B18.8.2 slotted (inch, SPIROL) | 5/64 (.078) in | .086 / .083 | B max .075; C .032 / .008 | .018 | .081 / .078 in | 800 / 3.56 lb / kN carbon & martensitic; 460 / 2.05 austenitic |
| ASME B18.8.2 slotted (inch, SPIROL) | 3/32 (.094) in | .103 / .099 | B max .091; C .038 / .008 | .022 | .097 / .094 in | 1,150 / 5.12 lb / kN carbon & martensitic; 670 / 2.98 austenitic |
| ASME B18.8.2 slotted (inch, SPIROL) | 1/8 (.125) in | .135 / .131 | B max .122; C .044 / .008 | .028 | .129 / .125 in | 1,875 / 8.34 lb / kN carbon & martensitic; 1,090 / 4.85 austenitic |
| ASME B18.8.2 slotted (inch, SPIROL) | 5/32 (.156) in | .167 / .162 | B max .151; C .048 / .010 | .032 | .160 / .156 in | 2,750 / 12.23 lb / kN carbon & martensitic; 1,600 / 7.12 austenitic |
| ASME B18.8.2 slotted (inch, SPIROL) | 3/16 (.187) in | .199 / .194 | B max .182; C .055 / .011 | .040 | .192 / .187 in | 4,150 / 18.46 lb / kN carbon & martensitic; 2,425 / 10.79 austenitic |
| ASME B18.8.2 slotted (inch, SPIROL) | 1/4 (.250) in | .264 / .258 | B max .245; C .065 / .012 | .048 | .256 / .250 in | 7,050 / 31.36 lb / kN carbon & martensitic; 4,100 / 18.24 austenitic |
| ASME B18.8.2 slotted (inch, SPIROL) | 5/16 (.312) in | .330 / .321 | B max .306; C .080 / .014 | .062 | .318 / .312 in | 10,800 / 48.04 lb / kN carbon & martensitic; 6,300 / 28.02 austenitic |
| ASME B18.8.2 slotted (inch, SPIROL) | 3/8 (.375) in | .395 / .385 | B max .368; C .095 / .016 | .077 | .382 / .375 in | 16,300 / 72.51 lb / kN carbon & martensitic; 9,500 / 42.26 austenitic |
| ASME B18.8.2 slotted (inch, SPIROL) | 1/2 (.500) in | .524 / .513 | B max .485; C .110 / .025 | .094 | .510 / .500 in | 27,100 / 120.55 lb / kN carbon & martensitic; 15,800 / 70.28 austenitic |

## Where the files are

- Westfield Fasteners: [Slotted spring pins ISO 8752 (replaces DIN 1481): d1 max / min before mounting, d2, a, s, min double-shear force, 1 to 50 mm](https://westfieldfasteners.co.uk/Standards/Pin-RollSlot.pdf) — web — Publisher's page; dimensions are facts
- iTeh Standards: [ISO 8752:2009 sample pages: Table 1 (d1, d2, a max / min, s, double shear), hole H12, chamfer](https://cdn.standards.iteh.ai/samples/40658/df4caae79e6b4325b3bc70097ffa4274/ISO-8752-2009.pdf) — web — Standards-body sample pages; numbers only
- Westfield Fasteners: [Coiled spring pins ISO 8750 (spiral roll pins): d1 max / min before mounting, d2, a, s, min double-shear force, 0.8 to 20 mm](https://westfieldfasteners.co.uk/Standards/Pin-SprgCoil.pdf) — web — Publisher's page; dimensions are facts
- iTeh Standards: [ISO 8750:2007 sample pages: Table 1 (d1, d2, s, double shear), hole H12, swaged chamfer](https://cdn.standards.iteh.ai/samples/40660/50d17b49b4994eb58f15a1b5a126a80c/ISO-8750-2007.pdf) — web — Standards-body sample pages; numbers only
- SPIROL: [Slotted spring pins, inch (ASME B18.8.2): nominal diameter, pin diameter max / min, chamfer B / C, wall S, recommended hole max / min, double shear](https://cdn.shopify.com/s/files/1/0492/3631/2223/files/SPIROL-Slotted-Spring-Pins-us.pdf) — web — Maker data sheet; numbers only
- SPIROL: [ISO 8752 slotted spring pin, 5 mm: diameter 5.40–5.60, recommended hole 5.00–5.12, chamfer 0.90–1.10, double shear 17.54 kN](https://shop.spirol.com/printitem/slotted-spring-pins/iso-8752-slotted-spring-pins-metric/72146) — web — Publisher's page; dimensions are facts
- McMaster-Carr: [Slotted spring pins (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/dowel-pins/slotted-spring-pins-6/) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)
- McMaster-Carr: [Coiled spring pins (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/pins/shaft-type~coiled/) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)
- McMaster-Carr: [Metric roll pins (slotted and coiled) (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/metric-roll-pins/) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)

## Free STEP/STL (2 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/spring-pins-iso-8752-8750-asme-b18-8-2/index.json

- spring-pin-hole-gauge-iso-8752-8750-2-12mm: [STEP](https://xemstudio.com/files/hardware/spring-pins-iso-8752-8750-asme-b18-8-2/spring-pin-hole-gauge-iso-8752-8750-2-12mm.step) · [STL](https://xemstudio.com/files/hardware/spring-pins-iso-8752-8750-asme-b18-8-2/spring-pin-hole-gauge-iso-8752-8750-2-12mm.stl) — hole gauge plate, 86.0 × 20.0 × 3 mm, eight holes at the nominal pin diameters 2, 3, 4, 5, 6, 8, 10, 12 mm (ISO 8752 / ISO 8750: hole = nominal d1, tolerance class H12, so the nominal is the lower limit), smallest first, 4 mm between hole edges and 4 mm of plate round the largest hole; plate thickness and spacing are Xem choices
- spring-pin-hole-gauge-inch-1-16-to-1-2: [STEP](https://xemstudio.com/files/hardware/spring-pins-iso-8752-8750-asme-b18-8-2/spring-pin-hole-gauge-inch-1-16-to-1-2.step) · [STL](https://xemstudio.com/files/hardware/spring-pins-iso-8752-8750-asme-b18-8-2/spring-pin-hole-gauge-inch-1-16-to-1-2.stl) — hole gauge plate, 98.3 × 20.7 × 3 mm, ten holes at the lower limit of SPIROL's recommended hole range for ASME B18.8.2 slotted pins (.062, .078, .094, .125, .156, .187, .250, .312, .375, .500 in; 1/16 through 1/2 in nominal), smallest first, 4 mm between hole edges and 4 mm of plate round the largest hole; plate thickness and spacing are Xem choices

## Questions

**What hole for a 5 mm slotted spring pin?**

Nominal 5 mm, class H12 (ISO 8752); SPIROL prints 5.00–5.12 mm and McMaster-Carr prints 5 to 5.2 mm. Pin diameter before mounting is 5.4–5.6 mm.

**What hole for a 1/8 in roll pin?**

SPIROL's ASME B18.8.2 sheet prints a recommended hole of .125 to .129 in (McMaster-Carr the same); the pin is .131 to .135 in before mounting.

**What is the wall of an ISO 8752 6 mm spring pin?**

s is 1.2 mm in Westfield's and iTeh's tables; pin diameter before mounting 6.4–6.7 mm.

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