Engineering Tools · Spring Pin Reference
Slotted Spring Pin Size Chart — ISO 8752 / GB/T 879.1 Heavy Duty and ISO 13337 / GB/T 879.2 Light Duty
A slotted spring pin carries one longitudinal slot; pressed into the hole the slot closes and the pin holds by radial spring force. This page sets ISO 8752 / GB/T 879.1 heavy duty and ISO 13337 / GB/T 879.2 light duty side by side: d1 from 1–50 mm, 52 sizes and 70 cut-length steps lc (4–200 mm). The two parts have independent size axes, so wall thickness and shear load differ at the same d1.
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GB/T 879.1-2018 — Slotted heavy duty
Modified adoption of ISO 8752:2009
Rows are dimension elements, columns are nominal diameters d1. d2 = slot root diameter; a = slot width; s = pin wall thickness; load in kN.
| d1 nominal | d1 max (before insertion) | d1 min (before insertion) | d2 (before insertion) | a max | a min | Minimum shear load (double shear) | s (wall thickness) |
|---|---|---|---|---|---|---|---|
| 1 | 1.3 | 1.2 | 0.8 | 0.35 | 0.15 | 0.7 | 0.2 |
| 1.5 | 1.8 | 1.7 | 1.1 | 0.45 | 0.25 | 1.58 | 0.3 |
| 2 | 2.4 | 2.3 | 1.5 | 0.55 | 0.35 | 2.82 | 0.4 |
| 2.5 | 2.9 | 2.8 | 1.8 | 0.6 | 0.4 | 4.38 | 0.5 |
| 3 | 3.5 | 3.3 | 2.1 | 0.7 | 0.5 | 6.32 | 0.6 |
| 3.5 | 4 | 3.8 | 2.3 | 0.8 | 0.6 | 9.06 | 0.75 |
| 4 | 4.6 | 4.4 | 2.8 | 0.85 | 0.65 | 11.24 | 0.8 |
| 4.5 | 5.1 | 4.9 | 2.9 | 1 | 0.8 | 15.36 | 1 |
| 5 | 5.6 | 5.4 | 3.4 | 1.1 | 0.9 | 17.54 | 1 |
| 6 | 6.7 | 6.4 | 4 | 1.4 | 1.2 | 26.04 | 1.2 |
| 8 | 8.8 | 8.5 | 5.5 | 2 | 1.6 | 42.76 | 1.5 |
| 10 | 10.8 | 10.5 | 6.5 | 2.4 | 2 | 70.16 | 2 |
| 12 | 12.8 | 12.5 | 7.5 | 2.4 | 2 | 104.1 | 2.5 |
| 13 | 13.8 | 13.5 | 8.5 | 2.4 | 2 | 115.1 | 2.5 |
| 14 | 14.8 | 14.5 | 8.5 | 2.4 | 2 | 144.7 | 3 |
| 16 | 16.8 | 16.5 | 10.5 | 2.4 | 2 | 171 | 3 |
| 18 | 18.9 | 18.5 | 11.5 | 2.4 | 2 | 222.5 | 3.5 |
| 20 | 20.9 | 20.5 | 12.5 | 3.4 | 3 | 280.6 | 4 |
| 21 | 21.9 | 21.5 | 13.5 | 3.4 | 3 | 298.2 | 4 |
| 25 | 25.9 | 25.5 | 15.5 | 3.4 | 3 | 438.5 | 5 |
| 28 | 28.9 | 28.5 | 17.5 | 3.4 | 3 | 542.6 | 5.5 |
| 30 | 30.9 | 30.5 | 18.5 | 3.4 | 3 | 631.4 | 6 |
| 32 | 32.9 | 32.5 | 20.5 | 3.6 | 3 | 684 | 6 |
| 35 | 35.9 | 35.5 | 21.5 | 3.6 | 3 | 859 | 7 |
| 38 | 38.9 | 38.5 | 23.5 | 4.6 | 4 | 1003 | 7.5 |
| 40 | 40.9 | 40.5 | 25.5 | 4.6 | 4 | 1068 | 7.5 |
| 45 | 45.9 | 45.5 | 28.5 | 4.6 | 4 | 1360 | 8.5 |
| 50 | 50.9 | 50.5 | 31.5 | 4.6 | 4 | 1685 | 9.5 |
This part carries a single shear row. The table note reads: only applies to products in steel and martensitic stainless steel; no double shear load is specified for austenitic stainless spring pins.
GB/T 879.2-2018 — Slotted light duty
Modified adoption of ISO 13337:2009
Rows are dimension elements, columns are nominal diameters d1. d2 = slot root diameter; a = slot width; s = pin wall thickness; load in kN.
| d1 nominal | d1 max (before insertion) | d1 min (before insertion) | d2 (before insertion) | a max | a min | Minimum shear load (double shear) | s (wall thickness) |
|---|---|---|---|---|---|---|---|
| 2 | 2.4 | 2.3 | 1.9 | 0.4 | 0.2 | 1.5 | 0.2 |
| 2.5 | 2.9 | 2.8 | 2.3 | 0.45 | 0.25 | 2.4 | 0.25 |
| 3 | 3.5 | 3.3 | 2.7 | 0.45 | 0.25 | 3.5 | 0.3 |
| 3.5 | 4 | 3.8 | 3.1 | 0.5 | 0.3 | 4.6 | 0.35 |
| 4 | 4.6 | 4.4 | 3.4 | 0.7 | 0.5 | 8 | 0.5 |
| 4.5 | 5.1 | 4.9 | 3.9 | 0.7 | 0.5 | 8.8 | 0.5 |
| 5 | 5.6 | 5.4 | 4.4 | 0.7 | 0.5 | 10.4 | 0.5 |
| 6 | 6.7 | 6.4 | 4.9 | 0.9 | 0.7 | 18 | 0.75 |
| 8 | 8.8 | 8.5 | 7 | 1.8 | 1.5 | 24 | 0.75 |
| 10 | 10.8 | 10.5 | 8.5 | 2.4 | 2 | 40 | 1 |
| 12 | 12.8 | 12.5 | 10.5 | 2.4 | 2 | 48 | 1 |
| 13 | 13.8 | 13.5 | 11 | 2.4 | 2 | 66 | 1.2 |
| 14 | 14.8 | 14.5 | 11.5 | 2.4 | 2 | 84 | 1.5 |
| 16 | 16.8 | 16.5 | 13.5 | 2.4 | 2 | 98 | 1.5 |
| 18 | 18.9 | 18.5 | 15 | 2.4 | 2 | 126 | 1.7 |
| 20 | 20.9 | 20.5 | 16.5 | 2.4 | 2 | 158 | 2 |
| 21 | 21.9 | 21.5 | 17.5 | 2.4 | 2 | 168 | 2 |
| 25 | 25.9 | 25.5 | 21.5 | 3.4 | 3 | 202 | 2 |
| 28 | 28.9 | 28.5 | 23.5 | 3.4 | 3 | 280 | 2.5 |
| 30 | 30.9 | 30.5 | 25.5 | 3.4 | 3 | 302 | 2.5 |
| 35 | 35.9 | 35.5 | 28.5 | 3.6 | 3 | 490 | 3.5 |
| 40 | 40.9 | 40.5 | 32.5 | 4.6 | 4 | 634 | 4 |
| 45 | 45.9 | 45.5 | 37.5 | 4.6 | 4 | 720 | 4 |
| 50 | 50.9 | 50.5 | 40.5 | 4.6 | 4 | 1000 | 5 |
This part carries a single shear row. The table note reads: only applies to products in steel and martensitic stainless steel; no double shear load is specified for austenitic stainless spring pins.
Cut-length series lc and limits (mm)
| lc nominal | lc min | lc max | Parts on this page |
|---|---|---|---|
| 4 | 3.75 | 4.25 | Slotted heavy duty / Slotted light duty |
| 5 | 4.75 | 5.25 | Slotted heavy duty / Slotted light duty |
| 6 | 5.75 | 6.25 | Slotted heavy duty / Slotted light duty |
| 8 | 7.75 | 8.25 | Slotted heavy duty / Slotted light duty |
| 10 | 9.75 | 10.25 | Slotted heavy duty / Slotted light duty |
| 12 | 11.5 | 12.5 | Slotted heavy duty / Slotted light duty |
| 14 | 13.5 | 14.5 | Slotted heavy duty / Slotted light duty |
| 16 | 15.5 | 16.5 | Slotted heavy duty / Slotted light duty |
| 18 | 17.5 | 18.5 | Slotted heavy duty / Slotted light duty |
| 20 | 19.5 | 20.5 | Slotted heavy duty / Slotted light duty |
| 22 | 21.5 | 22.5 | Slotted heavy duty / Slotted light duty |
| 24 | 23.5 | 24.5 | Slotted heavy duty / Slotted light duty |
| 26 | 25.5 | 26.5 | Slotted heavy duty / Slotted light duty |
| 28 | 27.5 | 28.5 | Slotted heavy duty / Slotted light duty |
| 30 | 29.5 | 30.5 | Slotted heavy duty / Slotted light duty |
| 32 | 31.5 | 32.5 | Slotted heavy duty / Slotted light duty |
| 35 | 34.5 | 35.5 | Slotted heavy duty / Slotted light duty |
| 40 | 39.5 | 40.5 | Slotted heavy duty / Slotted light duty |
| 45 | 44.5 | 45.5 | Slotted heavy duty / Slotted light duty |
| 50 | 49.5 | 50.5 | Slotted heavy duty / Slotted light duty |
| 55 | 54.25 | 55.75 | Slotted heavy duty / Slotted light duty |
| 60 | 59.25 | 60.75 | Slotted heavy duty / Slotted light duty |
| 65 | 64.25 | 65.75 | Slotted heavy duty / Slotted light duty |
| 70 | 69.25 | 70.75 | Slotted heavy duty / Slotted light duty |
| 75 | 74.25 | 75.75 | Slotted heavy duty / Slotted light duty |
| 80 | 79.25 | 80.75 | Slotted heavy duty / Slotted light duty |
| 85 | 84.25 | 85.75 | Slotted heavy duty / Slotted light duty |
| 90 | 89.25 | 90.75 | Slotted heavy duty / Slotted light duty |
| 95 | 94.25 | 95.75 | Slotted heavy duty / Slotted light duty |
| 100 | 99.25 | 100.75 | Slotted heavy duty / Slotted light duty |
| 120 | 119.25 | 120.75 | Slotted heavy duty / Slotted light duty |
| 140 | 139.25 | 140.75 | Slotted heavy duty / Slotted light duty |
| 160 | 159.25 | 160.75 | Slotted heavy duty / Slotted light duty |
| 180 | 179.25 | 180.75 | Slotted heavy duty / Slotted light duty |
| 200 | 199.25 | 200.75 | Slotted heavy duty / Slotted light duty |
lc is the nominal cut length; min and max are the lower and upper limits fixed by the standard. Above 200 mm nominal length the series steps by 20 mm.
Same nominal diameter, side by side
For the nominal diameters both parts cover, wall thickness s and minimum double shear load are shown step by step: heavy duty carries the thicker wall and the higher load, but its diameter series also runs wider.
| d1 (mm) | GB/T 879.1-2018 — Slotted heavy duty | GB/T 879.2-2018 — Slotted light duty |
|---|---|---|
| 2 | s 0.4 mm2.82 kN | s 0.2 mm1.5 kN |
| 2.5 | s 0.5 mm4.38 kN | s 0.25 mm2.4 kN |
| 3 | s 0.6 mm6.32 kN | s 0.3 mm3.5 kN |
| 3.5 | s 0.75 mm9.06 kN | s 0.35 mm4.6 kN |
| 4 | s 0.8 mm11.24 kN | s 0.5 mm8 kN |
| 4.5 | s 1 mm15.36 kN | s 0.5 mm8.8 kN |
| 5 | s 1 mm17.54 kN | s 0.5 mm10.4 kN |
| 6 | s 1.2 mm26.04 kN | s 0.75 mm18 kN |
| 8 | s 1.5 mm42.76 kN | s 0.75 mm24 kN |
| 10 | s 2 mm70.16 kN | s 1 mm40 kN |
| 12 | s 2.5 mm104.1 kN | s 1 mm48 kN |
| 13 | s 2.5 mm115.1 kN | s 1.2 mm66 kN |
| 14 | s 3 mm144.7 kN | s 1.5 mm84 kN |
| 16 | s 3 mm171 kN | s 1.5 mm98 kN |
| 18 | s 3.5 mm222.5 kN | s 1.7 mm126 kN |
| 20 | s 4 mm280.6 kN | s 2 mm158 kN |
| 21 | s 4 mm298.2 kN | s 2 mm168 kN |
| 25 | s 5 mm438.5 kN | s 2 mm202 kN |
| 28 | s 5.5 mm542.6 kN | s 2.5 mm280 kN |
| 30 | s 6 mm631.4 kN | s 2.5 mm302 kN |
| 35 | s 7 mm859 kN | s 3.5 mm490 kN |
| 40 | s 7.5 mm1068 kN | s 4 mm634 kN |
| 45 | s 8.5 mm1360 kN | s 4 mm720 kN |
| 50 | s 9.5 mm1685 kN | s 5 mm1000 kN |
Basis & Disclosed Assumptions
Where the numbers come from
- Dimensions and shear loads are taken cell by cell from Table 1 and the sub-table below Table 1 of GB/T 879.1-2018 and GB/T 879.2-2018. This page and the family index share one constant, so every figure can be recalculated.
- d1 max, d1 min and d2 are pre-insertion values: a spring pin is larger than its hole before it is pressed in and holds by elastic recovery, so the limit sizes sit above the nominal value.
- The slotted parts give a single shear row that applies to steel and martensitic stainless steel only; their table note states that no double shear load is specified for austenitic stainless spring pins.
- a is the slot width (max and min columns) and s is the wall thickness. Together they set the shear section of the pin body, which is why d1 alone is not enough to compare two pins.
Scope & limits
- Nominal hole diameter equals d1 with tolerance zone H12 (ISO 286-2 / GB/T 1800.2). The standard requires that the slot must not close completely when the pin is fitted in the smallest permitted hole.
- Length limits are banded: ±0.25 mm for lc ≤ 10 mm, ±0.5 mm for 12–50 mm and ±0.75 mm for 55–200 mm.
- No shear load for austenitic stainless appears on this page: the standard does not specify it and it is not extrapolated here.
- No weight data in this family: the slotted parts tabulate no mass and this site offers no weight calculator for them.
References
- GB/T 879.1-2018 Spring-type straight pins — Slotted — Heavy duty, Table 1 (National Public Service Platform for Standards Information)
- GB/T 879.2-2018 Spring-type straight pins — Slotted — Light duty, Table 1
- GB/T 1800.2-2020 Geometrical product specifications (GPS) — ISO code system for tolerances on linear sizes: source of H12
Cite this chart
YAXIIO. Slotted Spring Pin Size Chart — ISO 8752 / GB/T 879.1 Heavy Duty and ISO 13337 / GB/T 879.2 Light Duty. https://www.yaxiio.com/en/tools/spring-pin-chart/slotted (accessed 2026-10-29).
Free to cite and embed — attribution required: “YAXIIO” + a link to this page.
FAQ
At the same d1, how much stronger is heavy duty than light duty?
Take d1 = 50 mm, the largest nominal diameter both parts cover: heavy duty has a wall thickness s of 9.5 mm and a minimum double shear load of 1685 kN, while light duty has s = 5 mm and 1000 kN. The difference is the wall: the light-duty body is thinner, so it presses in with less force and exerts less radial force on the hole wall, which suits thin-walled parts and light locating duties.
Why is there only one shear row for slotted pins?
Because the table note of ISO 8752 / GB/T 879.1 and ISO 13337 / GB/T 879.2 gives a single row for steel and martensitic stainless steel and states that no double shear load is specified for austenitic stainless spring pins. An austenitic pin in these two parts therefore has no standard shear figure, and this site does not extrapolate one. For austenitic stainless shear data, use the b row of the coiled parts.
What hole size should I use?
Nominal diameter equals d1 with tolerance zone H12 (ISO 286-2 / GB/T 1800.2); the slotted parts have no exception. The standard adds one hard requirement: the slot must not close completely when the pin sits in the smallest permitted hole — if the hole is undersized the body is squeezed shut and the spring grip is lost.
Related References
Disclaimer: this chart provides engineering reference data for selection and quotation only; it is not a design basis or an acceptance standard.