Hexagon head bolts

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Production Specification

M5 X 8L ~ M36 X 200L



Product Production Specification table

Product specifications

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Strength 8.8 10.9 12.9
Material SCM435 Boron steel SCM435
Hardness (HRC) d ≤ 16 22~32
d > 16 22~32		 32 ~ 39 39 ~ 44
Remarks Black oxide Coarse thread
Fine thread
Black oxide		 A full screw
Black oxide

StandardKS B 1002

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Product specifications and characteristics  

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the title of a screw(d) the pitch of a screw(P) Fine thread ds k s e dk r da z A ~ B E F
Reference Dimensions tolerance Reference Dimensions tolerance Reference Dimensions tolerance about about Min Max about Max Max
M6 1 6 0 0
-0.2 		4 ±0.25 10 0 / -0.6 11.5 9.8 0.25 6.8 1 0.3 1˚ 2˚
M8 1.25 M8X1 8 5.5 13 0
-0.7 		15 12.6 0.4 9.2 1.2 0.4
M10 1.5 M10X1.25 10 7 ±0.3 17 19.6 16.5 0.4 11.2 1.5 0.5
M12 1.75 M12X1.5
M12X1.25 		12 0
-0.25 		8 19 0
-0.8 		21.9 18 0.6 13.7 2 0.7
M14 2 M14X1.5 14 9 22 25.4 21 0.6 15.7 2 0.7
M16 2 M16X1.5 16 10 24 27.7 23 0.6 17.7 2 0.8
M18 2.5 M18X1.5 18 12 ±0.35 27 31.2 26 0.6 20.2 2.5 0.9
M20 2.5 M20X1.5 20 0
-0.35 		13 30 34.6 29 0.8 22.4 2.5 0.9
M22 2.5 M22X1.5 22 14 32 0
-1 		37 31 0.8 24.4 2.5 1.1
M24 3 M24X2 24 15 36 41.6 34 0.8 26.4 3 1.2
M27 3 27 17 41 47.3 39 1 30.4 3 1.3
M30 3.5 30 19 ±0.4 46 53.1 44 1 33.4 3.5 1.5
M33 3.5 33 0
-0.4 		21 50 57.7 48 1 36.4 3.5 1.6
M36 4 36 23 55 0
-1.2 		63.5 53 1 39.4 4 1.8
M39 4 39 25 60 69.3 57 1 42.4 4 2
M42 4.5 42 26 65 75 62 1.2 45.6 4.5 2.1

Mechanical and Physical Properties of Bolts, Screws, and Stud Bolts KS B 0233

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Clause
Num		 Mechanical and physical properties Strength classification
3.6 4.6 4.8 5.6 5.8 6.8 8.8 9.8 10.9 12.9
d≤16mm d>16mm
5.1 Tensile strength
Rm, nom N/mm² 		300 400 500 600 800 800 900 1000 1200
5.2 Minimum tensile strength
Rm, min N/mm²(kgf/mm²) 		330 400 420 500 520 600 800
(81.6) 		830
(84.6) 		900 1040
(106) 		1220
(124)
5.3 Vickers Scale(Hv) Min 95 120 130 155 160 190 250 255 290 320 385
F≥30 D² Max 220 250 320 335 360 380 435
5.4 Brinell hardness(HB) Min 90 114 124 147 152 181 238 242 276 304 366
F=30 D² Max 209 238 304 318 342 361 414
5.5 Rockwell scale(HRC) Min - - - - - - 22 23 28 32 39
Max - - - - - - 32 34 37 39 44
5.6 Surface hardness HV 0.3 Max - 320 356 380 402 454
5.7 down yield stress title 180 240 320 300 400 480 - - - - -
ReL N/mm² Min 190 240 340 300 420 480 - - - - -
5.8 0.2% proof stress title - 640 640 720 900 1080
Rp0.2 N/mm² Min - 640 660 720 940 1100
5.9 Proof load stress Sp Sp/ReL or
Sp/Rp0.2
N/mm² 		0.94 0.94 0.91 0.93 0.90 0.92 0.91 0.91 0.90 0.88 0.88
180 225 310 280 380 440 580 600 650 830 970
5.10 Breaking torque MB Nm Min - 59.2 61.2 66.3 84.5 98.9
5.11 Fracture Elongation A Min - - - - - - 12 12 10 9 8
5.12 Breaking torque Z % Min - 52 48 48 44
5.13 Wedge tensile test The value of the full-size bolts and screws (not studs) must be greater than or equal to the minimum value for the longest strength (see 5.2).
5.14 impulse strength KU J Min - 25 - 30 30 25 20 15
5.15 Head impact strength It must not be destroyed.
5.16 Minimum height of non-carburized screws, E - ½H1 ⅔H1 ¾H1
Maximum height of completely decarburized area, G mm - 0.015
5.17 Hardness after tempering - The value of the Vickers hardness should not decrease by more than 20.
5.18 urface flaw Satisfy ISO 6157-1 (KSB 0547) or ISO 6157-3 (KSB 0549)
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