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Hexagonal Head Structural Bolts DIN 7990

    Metric Series:

Physical Properties

Property Class

5.8

6.8

8.8

10.9

Diameter

All Diameter

All Diameter

<M16

>M16

All Diameter

Unit

N/mm2

N/mm2

N/mm2

N/mm2

Tensile Strength (Min) 520 600 800 830 1040
Yield Strength 0.2% offset (Min) 420 480 640 660 940
Proof Load Stress 380 440 580 600 830
Impact Strength (Min)   (J) N/A N/A 30 30 20
Hardness Rockwell  [HR] B82-B95 B89-B100 C22-C32 C23-C34 C32-C39
Elongation (Min.)   [%] N/A N/A 12 12 9
Reduction of Area (Min). [%] N/A N/A 52 52 48
 

Recommended Tightening Torques and Induced Loads

Nominal Thread Size

Stress Are (mm2)

5.8

6.8

8.8

10.9

Unlubricated Finish

Induced Load

Lubricated Finish

Induced Load

Unlubricated Finish

Induced Load

Unlubricated Finish

Induced Load

Nm

Kn

Nm

Kn

Nm

Kn

Nm

Kn

M12 84.3 59.48 24.78 67.98 28.32 90.64 37.77 133.13 55.47
M16 157.0 147.71 46.16 168.81 52.75 225.08 7034 330.58 103.31
M20 245.0 288.12 72.03 392.28 82.32 452.76 113.20 644.84 161.21
M22 303.0 391.96 89.08 447.95 101.81 615.94 140.00 877.25 199.37
M24 353.0 498.15 103.78 569.32 118.61 782.81 163.08 1114.91 232.27
M27 459.0 728.71 134.95 832.81 154.22 1145.11 212.06 1630.92 302.02
M30 561.0 989.61 164.93 1130.97 188.50 1555.10 259.18 2214.83 369.14

        Note:

               The Tightening torques are calculated to induce approximately stresses as detailed below:

 
 294 N/mm2 for Property Class 5.8
336 N/mm2 for Property Class 6.8
448 N/mm2 for Property Class M<16
448 N/mm2 for Property Class 8.8 >16
658 N/mm2 for Property Class 10.9
 

             The tightening torques of lubricated finished is 75% of the values stated unlubricated finish.

Nominal Thread Size

Pitch

 F Max.

 G Max.

 B Max.

 H Max.

 R Max.

Length    of Thread

Length Range L

LT

M12

1.75 19.0 21.10 12.70 8.0 0.60 17.75 25-120

M16

2.00 24.0 26.16 16.70 10.0 0.60 21.00 30-150

M20

2.50 30.0 32.95 20.84 13.0 0.80 23.50 35-200

M22

2.50 32.0 35.03 22.84 14.0 0.80 25.50 45-200

M24

3.00 36.0 39.55 24.84 15.0 0.80 26.00 50-200

M27

3.00 41.0 45.20 27.84 17.0 1.00 29.00 7-200

M30

3.50 46.0 50.85 30.84 19.0 1.00 30.50 80-200

          Metric Series Dimensions:

  • The Bolts and Screws will generally conform to DIN 7990

  • Thread will conform to Class 6g of DIN 13 Coarse Series

  • Material: Carbon / Alloy Steel

  • Heat Treatment: To achieve mechanical properties of Class 8.8 and 10.9

  • All dimensions are in millimeters

 

Stud Bolts ASTM A193

Stud Bolts ASTM A320

Hexagon Nuts SAE J995

Hexagon Nuts DIN 934

Plain Washer

Dimension of Heavy Hex Nuts

Heavy Head Structural Bolts DIN 7990

Heavy Hex structural Bolts ASTM A325

Heavy Hex Structural Bolts ASTM A325M

Hex Bolts/Screws ASTM A307.Gr.A

Hex Bolts/Screws ASTM A307.GR.B

Hexagon Hex Bolts/ Screws Din 931/933

Hexagon hex Bolts /Screws 931/933

Hexagon Hex Nuts  ASTM A194/A194M

Rounded Hardened Steel Washer

Spring Lock Washer DIN127

Taper & Square Washer

Structural Bolting /Nuts/Washer

Heavy Pattern 'U' Bolts

Anchor Bolts            (Metric Series)

Hardened Steel Washer

Hexagon Socket Head Cap Screws DIN 912

Hexagon Socket Head Cap Screw ANSI B18.3

Heavy Hexagon Nuts ASTM A563, A, B, C, D, DH,DH3

Heavy Hexagon Hex Nuts ASTM A563M

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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