TYPE

SIZE

CLASS/MATERIAL

SURFACE

STANDARD

METRIC
& INCH SIZE

M5-M36

Grade 4.8

5.8 , 6.8 ,8.8

10.9,12.9

A2, A4

PLAIN

BLACK
Z.P. CR3+
YZP
H.D.G.

DAROMET

GEOMET

DIN931　 DIN933
DIN960　 DIN961
DIN7990
DIN6914

ISO4014
ISO4017
AS1111　 JIS1180
BS916

ASME B18.2.3.1M
ASME B18.2.3.2M
ASTM A325 TYPE 1

SAE J429--GRADE 2
SAE J429--GRADE 5
SAE J429--GRADE 8