Mechanical Properties of Fasteners (Metric)

Mechanical Properties of Fasteners (Metric)

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CLASS		New Designation	4.6	4.8	5.6	5.8	6.6	6.8	6.9	8.8	10.9	12.9	14.9
		Formerly	4D	4S	5D	5S	6D	6S	6G	8G	10K	12K	——
U.S. GRADE			1	2	2	2	3	3	3	5	8	——	——
Brinell		min. max.	110 170		140 215		170 245			225> 300	280 365	330 425	390 ——
Rockwell		min. max.	63 88		78 97		88 102			—— ——	—— ——	—— ——	—— ——
		min. max.	——		——		——			18 31	27 38	34< 44	40 49
Yield Point psi			45,000		56,000		76,000		76,000	91,000	128,000	153,000	180,000
Tensile Strength psi		min. max.	56,000 78,000		70,000 100,000		85,000 113,000		85,338 99,561	113,784 128,000	142,230 170,676	170,000 200,000	200,000 230,000

 

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