宁波思拓紧固件有限公司
Ningbo SiTuo Fastener Co., Ltd
宁波思拓紧固件有限公司
Hexagon socket head cap screws-Knurled head, JIS 1176 (JIS B 1176 - 1988)
material Alloy Steel
grade, rigidity grade 12.9
Coating black oxide coating