Mechanical and Physical Properties of Screws

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No.	Mechanical or physical property	nom.c / min.	Property class
No.	Mechanical or physical property	nom.c / min.	4.6	4.8	5.6	5.8	6.8	8.8 d = 16mm	8.8 d > 16mm	9.8	10.9	12.9
1	Tensile strength, R_m, MPa, [N/mm²]	nom.^c min.	400 400	400 420	500 500	500 520	600 600	800 800	800 830	900 900	1000 1040	1200 1220
2	Lower yield strength, R_eL^d, MPa, [N/mm²]	nom.^c min.	240 240	–	300 300	–	–	–	–	–	–	–
3	Stress at 0.2% non-proportional elongation R_p0.2, MPa, [N/mm²]	nom.^c min.	–	–	–	–	–	640 640	640 660	720 720	900 940	1080 1100
4	Stress at 0.0048 d non-proportional elongation for full-size fasteners, R_pf, MPa, [N/mm²]	nom.^c min.	–	320 340	–	400 420	480 480	–	–	–	–	–
5	Stress under proof load, S_p, MPa, [N/mm²] Proof strength ratio S_p,nom / R_{eL min} or S_p,nom / R_{p0.2 min} or S_p,nom / R_{pf min}	nom.	225 0,94	310 0,91	280 0,93	380 0,90	440 0,92	580 0,91	600 0,91	650 0,90	830 0,88	970 0,88
6	Percentage elongation after fracture for machined test pieces, A, %	min.	22	–	20	–	–	12	12	10	9	8
7	Percentage reduction of area after fracture for machined test pieces, Z, %	min.	–	–	–	–	–	52	52	48	48	44
8	Elongation after fracture for full-size fasteners, At (see also ISO 898-1 Annex C)	min.	–	–	0.24	–	0.22	0.20	–	–	–	–
9	Head soundness	–	no fracture
10	Vickers hardness, HV (F = 98 N)	min. max.	130 220⁹	155 220⁹	160 220⁹	190 –	250 –	255 320	290 335	320 360	385 380	– 435
11	Brinell hardness, HBW (F = 30 D²)	min. max.	114 209⁹	124 209⁹	147 209⁹	152 209⁹	181 238	238 304	242 318	276 342	304 361	366 414