ISO 8752 / DIN 1481 spring pin: dimensions and sizes
Slotted spring pin, heavy series, from 1 to 20 mm nominal diameter, in the stock lengths of each size. Pick the diameter and the length to download its CAD files.
ISO 8752 / DIN 1481 spring pin dimensions
| Nominal d | d1min, mm | d1max, mm | d2approx, mm | smm | amin, mm | lfrom, mm | lto, mm |
|---|---|---|---|---|---|---|---|
| 1 | 1.2 | 1.3 | 0.8 | 0.2 | 0.15 | 4 | 20 |
| 1.5 | 1.7 | 1.8 | 1.1 | 0.3 | 0.25 | 4 | 20 |
| 2 | 2.3 | 2.4 | 1.5 | 0.4 | 0.35 | 4 | 30 |
| 2.5 | 2.8 | 2.9 | 1.8 | 0.5 | 0.4 | 4 | 30 |
| 3 | 3.3 | 3.5 | 2.1 | 0.6 | 0.5 | 4 | 40 |
| 3.5 | 3.8 | 4 | 2.3 | 0.75 | 0.6 | 4 | 40 |
| 4 | 4.4 | 4.6 | 2.8 | 0.8 | 0.65 | 4 | 50 |
| 4.5 | 4.9 | 5.1 | 2.9 | 1 | 0.8 | 5 | 50 |
| 5 | 5.4 | 5.6 | 3.4 | 1 | 0.9 | 5 | 80 |
| 6 | 6.4 | 6.7 | 4 | 1.2 | 1.2 | 10 | 100 |
| 8 | 8.5 | 8.8 | 5.5 | 1.5 | 1.6 | 10 | 120 |
| 10 | 10.5 | 10.8 | 6.5 | 2 | 2 | 10 | 160 |
| 12 | 12.5 | 12.8 | 7.5 | 2.5 | 2 | 10 | 180 |
| 13 | 13.5 | 13.8 | 8.5 | 2.5 | 2 | 10 | 180 |
| 14 | 14.5 | 14.8 | 8.5 | 3 | 2 | 50 | 90 |
| 16 | 16.5 | 16.8 | 10.5 | 3 | 2 | 24 | 160 |
| 20 | 20.5 | 20.9 | 12.5 | 4 | 3 | 50 | 60 |
Dimensions in millimetres unless stated. Select a row to load its CAD files above.
Spring pin size before fitting
The outside diameter d1 is given before fitting, slightly larger than the nominal size, so the pin is compressed in the hole. The files use the largest d1. Both ends have a lead-in chamfer of length a. The slot width is not dimensioned in the tables and is drawn to look right.
Roll pin sizes and hole diameter
The nominal size is the hole: a 6 mm spring pin goes into a 6 mm drilled hole, and measures 6.4 to 6.7 mm before it is driven in. ISO 8752 is the heavy series, with a thick wall (1.2 mm at 6 mm). The light series, ISO 13337, has a thinner wall for softer parts, and coiled spring pins (ISO 8750) are a separate design rolled from strip.
ISO 8752 spring pins: common questions
- What size hole does a spring pin need?
- A drilled hole of the nominal diameter. The pin is larger than the hole before fitting and closes its slot as it is driven in.
- Is DIN 1481 the same as ISO 8752?
- Yes, ISO 8752 replaced DIN 1481 for the heavy duty slotted spring pin, and both names are used for the same part.