GB/T 818-2000 - Pan head screws with cross recess

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IDNR Ident number
D Nominal thread diameter	4.000 4.000	mm
D3 Nominal core diameter	3.141 3.141	mm
P Pitch of bolt	0.700 0.700	mm
L Nominal length	30.000 30.000	mm
DK Diameter of the head	8.000 8.000	mm
K Head height	3.100 3.100	mm
RA Radius of the raised portion head	6.500 6.500	mm
M Cross recess	4.400 4.400	mm
R Radius	0.200 0.200	mm
X Length of the thread run-out	1.200 1.200	mm
B Thread length	28.600 28.600	mm

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