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DIN 7991 CSK Allen Bolt

DIN 7991 CSK Allen Bolt

DIN 7991 Screw As Per UNI 5933/ DIN EN ISO 10462 Standard, Check Countersunk Head Cap Screws Heads Types

Countersunk Head Cap Screws

  • Flat Head
  • Oval Head
  • Bugle Head

Non-Countersunk Heads

  • Button Head
  • Truss Head
  • Hex Head
  • Round Head
  • Pan Head

Table of Content

6 Advantages Of Hexagon Socket Countersunk Head Cap Screws, Refer Weight & Metric Size Chart

Advantages Of Countersunk Head Cap Screws

DIN 7991 Screw as per UNI 5933/ DIN EN ISO 10462 standard
  • Controlled heat treatment
  • Fully formed radiused
  • Maximum strength
  • High torque wrenching
  • Superior fatigue resistance
  • Tensile strength range 190,000 to 180,000 psi

DIN 7991 CSK Allen Cap Screw Head And Drive Styles

DIN 7991 Cap Screw Head

Size Product Diameter (D) (mm) Driver Bit Size (AS) (mm)
Min Max
M2 1.88 1.98 1
M3 2.87 2.98 2
M5 4.82 5 3
M8 7.78 8 5
M12 11.73 12 8
M2.5 2.38 2.48 1
M4 3.83 3.97 2
M6 5.82 6 4
M10 9.78 10 6
DIN 7991 CSK Screw As per ASME-B18.3.2 In 6-Lobe Drive

ASME-B18.3.2 6-Lobe drive

DIN 7991 CSK Screw As per ASME-B18.3.2 In 6-Lobe Drive
Availability Technical Data
Thread Diameter (d1) M2 M3 M5 M8 M1.6 M2.5 M4 M6
k (mm) 1.2 1.9 2.5 4 0.96 1.5 2.2 3
Tool Size T6 T10 T25 T40 T5 T8 T20 T30
d2 (mm) 3.8 5.6 9.2 14.5 3 4.7 7.5 11
Pitch (mm) 0.4 0.5 0.8 1.25 0.35 0.45 0.7 1
High Tensile DIN 7991 Countersunk Allen Cap Screw Grades And Equivalent

Equivalent Grades of DIN 7991 countersunk

Fastener Dimensional Standards
Product DIN ISO ASME UNI BS
Imperial Metric Imperial Metric
Countersunk Screws DIN 7991 ISO 10642 ASME B18.3 ASME B18.3.5M UNI 5933 BS 2470 BS 4168-8

CSK Bolt Full Form

Countersunk Bolt

Countersunk Socket Head Cap Screw Min. Ultimate Tensile Loads

Bolt thread diameter Property Class
Minimum ultimate tensile load
10.9 12.9 8.8
M4 7,300 8,560 5,620
M6 16,700 19,600 12,900
M10 48,200 56,600 37,100
M14 96,000 1,12,000 73,600
M20 2,04,000 2,39,000 1,62,000
M3 4,180 4,910 3,220
M5 11,800 13,800 9,080
M8 30,500 35,700 23,400
M12 70,200 82,400 53,900
M16 1,30,000 1,54,000 1,00,000

DIN 7991 CSK Allen Bolt Dimensions

DIN 7991 CSK Screw dimensions
Thread Dia Thread Length (b) Transition Diameter (da) Hex Socket Width Across Corner (e) Radius Under Head (r) Hex Socket Depth (t) Pitch of thread (P) Head Diameter (dk) Diameter Of Unthreaded Shank (ds) Thickness of head (k) Hex Socket Width Across Flat (s) Depth From Socket To Head Base (w)
max. max. min. min. min. coarse pitch min. max. min. max. max. min. max. norm. min.
M4 20 4.4 2.87 0.2 1.5 0.7 7.53 8.96 3.82 4 2.48 2.52 2.58 2.5 0.45
M6 24 6.5 4.58 0.25 2.2 1 11.34 13.44 5.82 6 3.72 4.02 4.095 5.14 0.7
M10 32 10.62 6.86 0.4 3.5 1.5 19.22 22.4 9.78 10 6.2 6.02 6.14 6 1.62
M14 40 15.5 11.43 0.6 4.5 2 26.52 30.8 13.73 14 8.4 10.025 10.175 10 1.62
M20 52 22 13.72 0.8 5.6 2.5 36.05 40.32 19.67 20 10.16 12.032 12.212 12 2.2
M3 18 3.3 2.3 0.1 1.1 0.5 5.54 6.72 2.86 3 1.86 2.02 2.06 2 0.25
M5 22 5.5 3.44 0.2 1.9 0.8 9.43 11.2 4.82 5 3.1 3.02 3.08 3 0.66
M8 28 8.54 5.72 0.4 3 1.25 15.24 17.92 7.78 8 4.96 5.02 5.14 5 1.16
M12 36 13.5 9.15 0.6 4.3 1.75 23.12 26.88 11.73 12 7.44 8.025 8.175 8 1.8
M16 44 17.5 11.43 0.6 4.8 2 29.01 33.6 15.73 16 8.8 10.025 10.175 10 2.2

DIN 7991 CSK Allen Head Screw Weight Chart

D L (mm) Weight in kg(s) per 1000 pcs
4 6 10 14 20 3 5 8 12 16 24
8 0.92 2.35 0.5 1.6
12 1.23 3.05 10 0.65 2.1 6
20 1.84 4.46 14.1 1 3.09 9 21.2
30 2.9 6.22 19.1 1.63 4.33 12 28.5 51.8
40 3.9 8.83 24.1 102 6.2 15 35.7 65.1
50 11 30.1 123 7.74 20 43 78.4 179
60 11.9 35.7 143 27 54 91.7 209
80 46.7 200 41 71.8 127 269
100 57.7 253 89.6 159 365
120 305 107 191 497
6 0.47
10 1.07 2.7 0.56 1.85 5
16 1.53 3.76 12.1 0.83 0.59 7
25 2.23 5.34 16.6 1.35 3.71 10 24.8
35 3.4 7.1 21.6 91.4 5.43 13 32.1 58.4
45 10.6 26.6 112 6.97 16 39.3 71.6
55 11.4 33.6 133 24 46.7 85 194
70 41.2 164 34 62.9 111 239
90 52.2 226 80.7 143 299
110 279 98.5 175 431

ISO 7991 Countersunk Screw Standard

ISO Of Countersunk Screw
8992 3506
8839 3269
7721 965
6152 898
4759 888
4757 261
4042 225

M16 DIN 7991 CSK Bolt Dimensions

M16 DIN 7991 CSK Bolt Dimensions

SIZE OF (D) HEAD CORNERS BODY DIA FLATS
H (MAX) H (MIN) C (MAX) C (MIN) D (MAX) D (MIN) F (MAX) F (MIN)
M8 5.3 5.1 14.38 14.38 8 7.98 13 12.98
M16 10.32 9.68 27.71 26.75 16 15.73 24 23.67
M6 4 3.98 11.05 11.05 6 5.9 10 9.97
M12 7.76 4.24 20.78 20.03 12 11.73 19 17.73

CSK Bolt Dimensions Chart

SIZE OF (D) HEAD CORNERS BODY DIA FLATS
H (MAX) H (MIN) C (MAX) C (MIN) D (MAX) D (MIN) F (MAX) F (MIN)
M14 9.09 8.51 24.25 23.35 14 13.73 22 20.67
M24 15.44 14.56 41.57 39.55 24 23.67 35 41.57
M10 6.63 6.17 18.48 17.77 10 9.78 17 15.73
M20 12.88 12.12 34.64 32.95 20 19.67 29.16 34.64

Weight Chart Of DIN 7991 CSK Allen Bolt

Bolt Size (mm) Weight per 1000 Bolts (kg)
M8 1.5
M12 5.4
M20 21
M6 0.75
M10 3
M16 12

DIN 7991 Allen Bolt Countersunk Screw Standard

Standards
ISO 10642 ASME/ANSI B 18.3
DIN EN ISO 10642 ASME B 18.3 (T8)
GB /T 70.3 JIS B 1194
ASME B 18.3 NF E 25-146
IFI 535 BS 4168-8
ASME/ANSI B 18.3.5M UNI 5933
BS 2470 IS 6761
CNS 4558

Angle Of DIN 7991 CSK Allen Bolt Metric Countersunk

92°/90° Angle Including M20 Head
62°/60° Angle Over M20 Head