Hex socket head cap screws

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Hex socket head cap screws KS B 1003ks마크

Strength 10.9 12.9 A2
Strength Quality BORON steel SCM435 STS304
Hardness 32 ~ 39 39 ~ 44 -
Remarks Black oxide / Nickel plating Black oxide / Nickel plating / Electroless Nickel plating Washing
Hex socket head cap screws

Standard

제품규격및성징  
the title of a screw(d) the pitch of a screw(P) dk da ds e f k r s t v dw w
Normal a thin screw Max1 Max2 Min Max Max
(Reference Dimensions)		 Max Max Min Max
(Reference Dimensions)		 Min Min title
(Reference Dimensions)		 Min Max Min Max Min Min
1 2
M1.6 0.35 3 3.14 2.86 2 1.6 1.46 1.73 0.34 1.6 1.46 0.1 1.5 1.52 1.560 1.545 0.7 0.16 2.72 0.55
M2 0.4 3.8 3.98 3.62 2.6 2 1.86 1.73 0.51 2 1.86 0.1 1.5 1.52 1.560 1.545 1 0.2 3.48 0.55
M2.5 0.45 4.5 4.68 4.32 3.1 2.5 2.36 2.30 0.51 2.5 2.36 0.1 2 2.22 2.060 2.045 1.1 0.25 4.18 0.85
M3 0.5 5.5 5.68 5.32 3.6 3 2.86 2.87 0.51 3 2.86 0.1 2.5 2.52 2.580 2.560 1.3 0.3 5.07 1.15
M4 0.7 7 7.22 6.78 4.7 4 3.82 3.44 0.60 4 3.82 0.2 3 3.02 3.080 3.071 2 0.4 6.53 1.4
M5 0.8 8.5 8.72 8.28 5.7 5 4.82 4.58 0.60 5 4.82 0.2 4 4.02 4.095 4.084 2.5 0.5 8.03 1.9
M6 1 10 10.22 9.78 6.8 6 5.82 5.72 0.68 6 5.70 0.25 5 5.02 5.140 5.084 3 0.6 9.38 2.3
M8 1.25 1 13 13.27 12.73 9.2 8 7.78 6.86 1.02 8 7.64 0.4 6 6.02 6.140 6.095 4 0.8 12.33 3.3
M10 1.5 1.25 16 16.27 15.73 11.2 10 9.78 9.15 1.02 10 9.64 0.4 8 8.025 8.175 8.115 5 1 15.33 4
M12 1.75 1.5/1.25 18 18.27 17.73 13.7 12 11.73 11.43 1.45 12 11.57 0.6 10 10.025 10.175 10.115 6 1.2 17.23 4.8
M14 2 1.5 21 21.33 20.67 15.7 14 13.73 13.72 1.45 14 13.57 0.6 12 12.032 12.212 12.142 7 1.4 20.17 5.8
M16 2 1.5 24 24.33 23.67 17.7 16 15.73 16.00 1.45 16 15.57 0.6 14 14.032 14.212 14.142 8 1.6 23.17 6.8
M18 2.5 1.5 27 27.33 26.67 20.2 18 17.73 16.00 1.87 18 17.57 0.6 14 14.032 14.212 14.142 9 1.8 25.87 7.7
M20 2.5 1.5 30 30.33 29.67 22.4 20 19.67 19.44 2.04 20 19.48 0.8 17 17.050 17.230 10 2 28.87 8.6
M22 2.5 1.5 33 33.39 32.61 24.4 22 21.67 19.44 2.04 22 21.48 0.8 17 17.050 17.230 11 2.2 31.81 9.5
M24 3 2 36 36.339 35.61 26.4 24 23.67 21.73 2.04 24 23.48 0.8 19 19.065 19.275 12 2.4 34.81 10.4
M27 3 2 40 40.39 39.61 30.4 27 26.67 21.73 2.89 27 26.48 1 19 19.065 19.275 13.5 2.7 38.61 12.1
M30 3.5 2 45 45.39 44.61 33.4 30 29.67 25.15 2.89 30 29.48 1 22 22.065 22.275 15.5 3 43.61 13.1
M33 3.5 2 50 50.39 49.61 36.4 33 32.61 27.43 2.89 33 32.38 1 24 24.065 24.275 16.5 3.3 48.61 15.0
M36 4 3 54 54.46 53.54 39.4 36 35.61 30.85 2.89 36 35.38 1 27 27.065 27.275 19 3.6 52.54 15.3

1 Apply to the unknurled bolt head.

2 Apply to the knurled bolt head.

Mechanical & Physical Property

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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