Page 679 - Mastik®

Surface pressure under the head of a Surface pressure when mounted
hexagon screw DIN 931 / 933

(ISO 4014 / 4017) with coarse thread

Width Ø of the Through Stressed Surface pressure
Nominal across bearing hole Bearing cross- under the head 1)
thread Ø flats surface (ISO 273) surface section mm [ ]
N
d s max. dW min. dh Ap A s nom 2
mm mm mm mm 2 mm 2 8.8 10.9 12.9 d a d w d h d
M 4 7 5,9 4,5 11,4 8,78 385 568 665
M 5 8 6,9 5,5 13,6 14,2 528 777 909
M 6 10 8,9 6,6 28 20,1 364 532 625 d h > d a
M 8 13 11,6 9 42,1 36,6 442 649 761
M10 16 14,63 11 73,1 58 405 594 695
M10 17 15,6 11 96,1 58 308 452 529
M12 18 16,63 13,5 74,1 84,3 580 853 999
M12 19 17,4 13,5 94,6 84,3 454 668 782
M14 21 19,64 15,5 114,3 115 517 759 888
M14 22 20,5 15,5 141,4 115 418 613 718
M16 24 22,5 17,5 157,1 157 515 756 885
M18 27 25,3 20 188,6 192 541 769 901
2
M20 30 28,2 22 244,4 245 532 761 888 A s nom = 4 ( d 2 + d 3 )
2
M22 34 31,71 24 337,3 303 480 685 803
M22 32 30 24 254,5 303 637 908 1065 d 2 = basic pitch diameter of external
M24 36 33,6 26 355,8 353 528 750 880 thread acc. to ISO 724
M27 41 38 30 427,3 459 576 821 960 d 3 = minor diameter of external
M30 46 42,7 33 576,7 561 520 740 865 thread

Surface pressure under the head of a socket head cap screw

to DIN 912 (ISO 4762) and coarse thread

Ø of the Through Stressed Surface pressure
Nominal Ø bearing hole Bearing cross- under the head 1)
thread Ø of head surface (ISO 273) surface section mm [ ]
N
d dK dW min. dh Ap As nom 2
mm mm mm mm 2 mm 2 8.8 10.9 12.9
d k d d h d w
M 4 7 6,53 4,5 17,6 8,78 250 370 432
M 5 8,5 8,03 5,5 26,9 14,2 268 394 461
M 6 10 9,38 6,6 34,9 20,1 292 427 502 R
M 8 13 12,33 9 55,8 36,6 333 489 574
M10 16 15,33 11 89,5 58 331 485 567
M12 18 17,23 13,5 90 84,3 478 702 822
M14 21 20,17 15,5 130,8 115 452 663 776
M16 24 23,17 17,5 181,1 157 447 656 767
M18 27 25,87 20 211,5 192 482 686 804
M20 30 28,87 22 274,5 245 474 678 791
M22 33 31,81 24 342,3 303 473 675 792 1) The values shown in the tables for surface
M24 36 34,81 26 420,8 353 447 635 744
pressure are for a 90% utilisation of the yield
M27 40 38,61 30 464 459 530 756 884 strength of the screw Rp0,2 and μG = 0,12
M30 45 43,61 33 638,4 561 470 669 782 (reference: VDI 2230:2003)

Comparison table of possible symbols, classes and values R z for surface roughness to DIN 4768
Measuring range Designation Units ISO 4288
40 25 16 10 max. R z value ( R t) [μm ] Geometrical Product Specifications
6.3 3.2 2 1.6 max. R a value [μm ] Surface texture: Roules and procedures
N9 N8 N7 Roughness classes [ – ] for the assessment of surface texture.
Old symbols [ – ]