Skip to main content

Specifications For Coiled Light Duty Tension Pins

Metric Series-ISO 8751 (formerly DIN 7344) ASME B18.8.3M

metric coil spring pins diagram

Nominal Diameter *22.533.54568
d1 Max2.282.823.353.874.455.56.558.65
d1 Min2.132.653.153.674.25.26.258.3
d2 Max1.92.42.93.43.94.855.857.8
a ~0.70.70.911.11.31.52
s0.110.140.170.190.220.280.330.45
Minimum double shear
** KN Carbon & Martenistic Stainless Steel (420 SS)
1.52.33.34.55.791323
Minimum double shear
** KN Austenitic Stainless Steel (18-8)
1.11.82.53.44.471018
LengthLength tolerance        
4         
5         
6+/- 0.25        
8         
10         
12         
14         
16         
18         
20         
22         
24         
26+/- .05        
28         
30         
32         
36         
40         
45         
50         
55         
60         
65         
70         
75         
80+/ - 0.75        
85         
90         
95         
100         
120         
140         
160         
180         
200         

* The spring pin's nominal diameter equates to the normal diameter of the respective location hole, whose tolerance zone is to ISO H 12
** In individual cases, it is important to check whether these shear forces can be taken into account depending on the structural properties.
The shear force is checked in accordance with DIN EN ISO 8749