QB /T 2564.3 (PZ) - 2012 Screwdriver blades for cross-recessed head screws - Tyep PZ

轻工行业QB /T2564.3 (PZ) - 2012 QB2564.3 256 十字槽螺钉旋具旋杆 PZ型

Unit:

Tip

D	Nominal Blade Diameter
b	max
	min
f	max
	min
g	max
	min
L	min
r	max
	min
α	max
	min
β	max
	min
γ	max
	min
δ	max
	min
Minimum test torque/(N · m), M_{for manual use}
Minimum test torque/(N · m), M_machine

3	4.5	6
0.78	1.19	1.78
0.7	1.11	1.7
0.45	0.71	1
0.42	0.68	0.95
0.92	1.4	2.44
0.89	1.37	2.39
1.54	2.02	3.17
0.1	0.13	0.3
0.07	0.1	0.15
7°00'	7°00'	5°45'
6°30'	6°30'	5°15'
8°15'	8°15'	6°50'
7°45'	7°45'	6°20'
4°53'	4°53'	3°30'
4°23'	4°23'	3°00'
46°15'	46°15'	46°15'
46°00'	46°00'	46°00'
1	3.5	8.2
1	3.9	10.3

①,The screwdriver tips shall have a minimum hardness of  54 HRC for hand-operated screwdrivers,  58 HRC for machine-operated screwdrivers, for a minimum length of three times the nominal blade diameter measured from the driving end. The remainder of the tool shall be hardened and tempered to a minimum of 50 HRC.
②,a：Axis b.
③,b：Axis g.
④,c：Axis b and g.