Mechanical Properties of Bolts, Screws and Studs

Mechanical Properties		8.8 <M 16	8.8 > M 16	9.8	10.9	12.9
Tensile Strength, Rm, N/mm2	Nom	800	800	900	1000	1200
Tensile Strength, Rm, N/mm2	Min	800	830	900	1040	1220
Vickers hardness, HV, F>98 N	Min	250	255	290	320	385
Vickers hardness, HV, F>98 N	Max	320	335	360	380	435
Brinell hardness, HB, F=30D2	Min	238	242	276	304	366
Brinell hardness, HB, F=30D2	Max	304	318	342	361	414
Rockwell hardness, HRC	Min	22	23	28	32	39
Rockwell hardness, HRC	Max	32	34	37	39	44
Surface hardness, HV 0.3	Max	320	356	380	402	454
Proof Stress, Rp 0.2, N/mm2	Nom	640	640	720	900	1080
Proof Stress, Rp 0.2, N/mm2	Min	640	660	720	940	1100
Stress under proof load, Sp, Sp/Rp	0.2	0.91	0.91	0.90	0.88	0.88
Stress under proof load, Sp, Sp/Rp	N/mm2	580	600	650	830	970
Elongation after fracture, A	Min	12	12	10	9	8
Impact Strength, J	Min	30	30	25	20	15
Head Soundness		No Fracture
Minimum height of non-decarburized thread zone, E		1/2 H1			2/3 H1	3/4 H1
Maximum depth of complete mm decarburization, G		0.015