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IDNR
Ident number
D
Nominal thread diameter
mm
D3
Nominal core diameter
mm
P
Pitch of bolt
mm
L
公称长度
mm
B
Thread length
mm
DK
Diameter of the head
mm
K
Head height
mm
N
Width of slot
mm
T
Depth of the driving feature
mm
A
Distance from the last full form thread to the bearing face
mm
R
Transition radius under head
mm
X
Thread rudiment
mm
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