宁波市镇海富美紧定螺钉厂
Ningbo Zhenhai Fumei Set Screw Factory
宁波市镇海富美紧定螺钉厂
(JB /ZQ 4447 - 1997)
material Alloy Steel
grade, rigidity Grade 10.9 (HRC32~39)
Coating black oxide coating