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

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

Unit:
Tip
0 1 2
D Nominal Blade Diameter
b max
min
e max
min
f max
min
g max
min
L min
α max
min
β max
min
Minimum test torque/(N · m), Mfor manual use
Minimum test torque/(N · m), Mmachine
3 4.5 6
0.61 1.03 1.56
0.56 0.98 1.51
0.38 0.54 1.13
0.29 0.49 1.08
0.31 0.53 0.64
0.26 0.48 0.59
0.84 1.3 2.31
0.79 1.25 2.26
2.78 2.78 4.37
/ 138°30' 140°30'
/ 138°00' 140°00'
7°00' 7°00' 5°45'
6°30' 6°30' 5°15'
1 3.5 8.2
1 3.9 10.3
①,a:Length of straight part.
②,b:Blending of flutes dependent on method of manufacture.
③,c:Flutes equally spaced at 90°.
④,d:For tip No. 0, see detail below ( f ).
⑤,e:Section Y-Y: true flute angle measured at right angles to straight part of length L.
⑥,f:Tip No. 0.
⑦,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.
Alternative history QB /T 2564.3PH - 2012

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Screwdriver blades for cross-recessed head screws - Tyep PZ

QB /T 2564.3 (PZ) - 2012

Screwdriver blades for cross-recessed head screws - Tyep PZ

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