Standard BS 4174 9
		80° Recess countersunk head screws, type Z
	
	
		
		|   Dimensions in mm - source BS 4174 Table 9 80° Recess countersunk head screws, type Z: Publication date: 10 - 1972  |  ||||||||
|   Ø thread size   |    dk min   |  dk max |   k nom   |    t min   |  t max | m nom | recess nr. | |
|   ST 2.2   |  3.73 | 4.37 | 1.3 | 1.19 | 1.6 | 2.4 | 1 | |
|   ST 2.9   |  4.95 | 5.71 | 1.7 | 1.85 | 2.26 | 3.05 | 1 | |
|   ST 3.5   | ||||||||
|   ST 4.2   | ||||||||
|   ST 4.8   | ||||||||
|   ST 5.5   | ||||||||
|   ST 6.3   | ||||||||
| ST 8 | ||||||||