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NOMINAL SIZE
(D)
WIDTH ACROSS
FLATS HEX BIT
( B )
FLATS OF SOCKET
HEAD BOLT
FLATS OF
SET SCREW(¹«µÎº¼Æ®)
M2
5
2
1.27
M3
5.5
2.5
1.5
(M3.5)
6
-
M4
7
3
(M4.5)
8
M5
4
M6
10
(M7)
11
M8
13
M10
(16) or (17)