Classification类别	Standard Code 标准号	Specification规格	Length长度	Property Grade性能等级	Surface 表面处理
六角头螺栓Hexagon Head Bolt	GB30	M5-M48	6-600	4.8 5.6 6.8 8.8 9.8 10.9 12.9	本色，发黑，发烂，白锌，电镀，彩镀，热烫锌 Plain Black White Zinc Blue Zinc Yellow Zinc HDG
	GB21
	GB5780-5786
	ANSI			2
	A-6	1/4" - 2"	3/8" - 25"	5
	A-10			8
	DIN			4.8 5.6 6.8 8.8 9.8 10.9 12.9
	931 933	M5-M48	6-600
	601 558 603
内六角 Internal Hex Screw	GB70	M4-M48	6-600	4.8 8.8 10.9
	ANSI G-4	1/4" - 2"	5/16" - 25"	2 5 8
	DIN912 78984	M4-M48	6-600	4.8 8.8 10.9
双头栓 Double End Bolt	GB897 898 900 901	M4-M56	12-1000	4.8 8.8 10.9 (Grade-2)
	ANSI C-6	1/4" - 2"	1/2" - 40"
	DIN938 939 835	M4 - M56	12 - 1000
其他 Others	Standard Bolts Hexagon head bolt, internal hexagonal screw, double end bolt, stud bolt, carriage bolt, U bolt, Eye boltT bolt, adjusting bolt and irregular bolts, full thread stud, half thread screw