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Westfield Fasteners Product Specification:

Slotted Pan Head Screws with Large Head, to DIN 921

This product guide contains the specification for Slotted pan head screws with large head, a series of standard parts available from Westfield Fasteners. The basis of this specification is the internationally recognised DIN standard DIN 921.

Product Description
These large diameter headed screws offer excellent load distribution and an aesthetically pleasing low-profile head. The wide head also eliminates the need for a washer. Installed using a flat head screwdriver, the slotted pan head screw is useful in situations where a thumbscrew or a standard pan head screw is not suitable.

Scope of the DIN Standard
DIN 921 specifies the tolerances and the variation of detailing allowable for the slotted pan head with a large head, for sizes M1 up to and including M10. Table 1 below defines the overall dimensions and tolerances of this screw type.

technical drawing of Slotted Pan Head Screws with Large Head, to DIN 921

Figure 1: Slotted Pan Screw with Large Head

Notes to Figure 1:



Table 1: Dimensions & Tolerances according to DIN 921

Thread Size, dpadkknrtv
maxNomminnommaxminNommaxminmaxmaxmin=
M10.250.53.503.200.700.820.580.250.450.310.100.500.350.20
M1.20.250.54.003.700.800.920.350.30.500.360.100.550.400.20
M1.40.30.64.504.200.901.020.780.30.500.360.100.600.450.25
M1.60.350.45.004.701.001.120.880.40.600.460.100.700.500.25
M20.40.86.005.641.201.321.080.50.700.560.100.800.600.30
M2.50.450.97.006.641.501.621.380.60.800.660.100.950.750.40
M30.51.08.007.641.801.921.680.81.000.860.101.150.900.45
M40.71.412.0011.572.402.522.2811.201.060.201.501.200.60
M50.81.616.0015.572.702.822.581.21.511.260.201.601.300.70
M612.020.0019.483.103.252.951.61.911.660.251.901.500.80
M81.252.525.0024.483.803.953.6522.312.060.402.401.900.90
M101.53.030.0029.484.604.754.452.52.812.560.402.802.301.10


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