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Westfield Fasteners Product Specification:

Slotted Spring Pins (Roll Pins), Heavy Duty Type, to ISO 8752 / DIN 1481

This product guide contains the specification for metric sized slotted spring pins, heavy duty type, as available from Westfield Fasteners. The basis of this specification is the ISO standard ISO 8752 and the older DIN 1481.

Product Description
Slotted roll pins are self retaining pins, as the steel grades that they are made from allow the pin to sit effectively in tension within the hole(s) that they are fitted to.

Slotted roll pins are also known as slotted spring pins, tension pins, split dowel pins and hollow spring pins. Slotted roll pins are generally used for locating two parts accurately. This particular type and are designed for more heavy duty use than other types of tension pin.
Scope of the ISO & DIN Standard
ISO 8752 specifies the characteristics of these heavy duty slotted spring-type straight pins, with nominal diameters from 1mm to 50mm inclusively. This standard covers slotted roll pins in steel, and austenitic and martensitic stainless steels.

Table 1 below defines the overall dimensions and tolerances of this pin type. Minimum shear strength values given in this table are applicable to steel and martensitic stainless steels only; figures for austenitic stainless steels are not given, which unfortunately includes 301 grade stainless steel, a material choice available from Westfield Fasteners for these items.

ISO 8752 supercedes the DIN standard 1481. Parts are interchangable between the two standards except that the option for a chamfer at one end begins at 8mm diamter for the DIN standard, whilst the ISO standard specifies this option from 10mm.


technical drawing of Slotted Spring Pins (Roll Pins), Heavy Duty Type, to ISO 8752 / DIN 1481

Figure 1: Slotted Roll Pin, Heavy Duty Type

Notes to figure 1:



Application Notes
The diameter of the hole should be equal to the nominal diameter d1 of the mating pin, and prepared to tolerance class H12. When the pin is fitted into the smallest permitted hole, the slot should not be fully closed.

Table 1: Dimensions & Tolerances according to ISO 8752

d1d2asMinimum shear strength (double shear)
nombefore mountingbefore mounting
maxminmaxmin
11.31.20.80.350.150.20.7
1.51.81.71.10.450.250.31.58
22.42.31.50.550.350.42.82
2.52.92.81.80.60.40.54.38
33.53.32.10.70.50.66.32
3.54.03.82.30.80.60.759.06
44.64.42.80.850.650.811.24
4.55.14.92.91.00.81.015.36
55.65.43.41.10.91.017.54
66.76.44.01.41.21.226.04
88.88.55.52.01.61.542.76
1010.810.56.52.42.02.070.16
1212.812.57.52.42.02.5104.1
1313.813.58.52.42.02.5115.1
1414.814.58.52.42.03.0144.7
1616.816.510.52.42.03.0171.0
1818.918.511.52.42.03.522.5
2020.920.512.53.43.04.0280.6
2121.921.513.53.43.04.0298.2
2525.925.515.53.43.05.0438.5
2828.928.517.53.43.05.5542.6
3030.930.518.53.43.06.0631.4
3232.932.520.53.63.06.0684
3535.935.521.53.63.07.0859
3838.938.523.54.64.07.51003
4040.940.525.54.64.07.51068
4545.945.528.54.64.08.51360
5050.950.531.54.64.09.51685

Please note that minimum shear strength values given in the table above are applicable to steel and martensitic stainless steels only; figures for austenitic stainless steels are not given, which unfortunately includes 301 grade stainless steel, a material choice available from Westfield Fasteners for these items.




For further details, please refer to the ISO/DIN standard document for this item.