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High Strength Friction Grip Bolt

Structure Bolts, Nuts and Washers in Friction Grip Joints

The use of high strength structual fasteners in friction grip joints has been one of the most importnat developments in structural engineering over the last four decades. It provides a simple method of transmitting loads through a structural joint by the friction on the contact face developed through the high clamping force from correctly tightened high strength bolts and nuts.

The bolts are fitted in clearnance holes and since the joint is designed to resist slp , they are not subject to bearing or shear forces and thus remain in virtually static tension throughout their working life with fluctuating loads having very little, of any effect on bolt stress.

The head dimensions (across float sizes) of H.S.S. Bolts and Nuts are one step higher than those of the normal hexagon bolts and nuts of the same diameter. The bearing pressure under the head of H.S.S. Bolts will this be necessarily lower than that of the conventional of the hard bolt head into softer structural steel is therefore prevented.

Reliability:

Once tightened, the bolts will remain tight and maintain the permanent strength of the joint. Absence of heavy stress concentration due to absence of bearing between bolts and plates. As bolts are in tension, it does not permit loosening, thus making it most ideal where vibrations are involved.

Economy:

Fewer high strength bolts are required than M.S. bolts and rivets. Drilling of close tolerance holes is not required. Overall weight of the structure will be very light.

Simplicity:

A minimum of skill is required in tightening and the operators need only to follow a few simple rules.

Convenience:

Whether in the workshop or at the site, H.S.S. Bolts enable joints to be made easily. Welding of site splices can be elimnated avoiding the difficulties of welding in adverse weather conditions. Absence of pneumatic hammers used in riveted joints reduce noise level.

Maximum Permissible Applied Forces for Joints as per IS 4000:1992
Nominal Size of Bolt Stress Area of Bolt in mm² Maximum Permissible Applied Forces in Bolts in kN
Tension (P) in Bolts of Preperty Class Shear in Bearing Type Joints V for Bolts of Property Class
Shank Thread 8.8 10.9 8.8 10.9
Shank Thread Shank THread
(1) (2) (3) (4) (5) (6) (7) (8) (9)
M 16 201 157 56.7 78 40.2 31.4 52.3 40.8
M 20 314 245 88.2 122 65.2 50.8 81.6 63.7
M 24 452 353 127 176 93.8 73.2 117 91.8
M 30 706 561 202 280 146 116 148 146
M 36 1017 817 294 407 211 169 264 212
Thread Size M16 M20 (M22) M24 (M27) M30 M36
Pitch 2.0 2.50 2.50 3.00 3.00 3.50 4.00
dw Max. 16.70 20.84 22.84 24.84 27.84 30.84 37.00
Min. 15.30 19.16 21.16 23.16 26.16 29.16 35.00
da Max. 18.70 23.24 25.24 27.64 30.40 33.40 39.40
S Max. 27.00 34.00 36.00 41.00 46.00 50.00 60.00
Min. 26.16 33.00 35.00 40.00 45.00 49.00 58.80
E Min. 29.56 37.29 39.55 45.20 50.85 55.37 66.44
K Max. 10.75 13.40 14.90 15.90 17.90 19.57 23.55
Min. 9.25 11.60 13.10 14.10 16.10 17.65 21.45
N Min. 0.60 0.80 0.80 1.00 1.20 1.20 1.50
Maxumum Recommended Tightening Torque Metric Thread for Quality 8.8
Nominal Thread Dia mm Course NM Fine NM
M16 252 268
M18 347 391
M20 492 546
M22 670 736
M24 851 926
M27 935 1344
Mechanical Properties of H.S.S. Bolts
Thread Size Stress Area Property Class 8.8 Property Class 10.9
Ultimate Load (Min) Proof Load (Min) Hardness Ultimate Load (Min) Proof Load (Min) Hardness
mm² Newtons Newtons HRC Newtons Newtons HRC
M16 157 125600 91060 22-32 163280 130310
M20 245 203350 147000 23-34 254800 203350
(M22) 303 251490 181800 315120 251490
M24 353 292990 211800 367120 292990 32-39
(M27) 459 380970 275400 477360 380970
M30 561 465630 336600 583440 465630
M36 817 678110 490200 849680 678110

High Strength Structural Washers:

High Strength Structural Washers - Dimensions
Bolt Size M16 M20 (M22) M24 (M27) M30 M36
d1 Min. 18.00 22.00 24.00 26.00 30.00 33.00 39.00
Max. 18.43 22.52 24.52 26.52 30.52 33.62 39.62
d2 Max. 34.00 42.00 44.00 50.00 56.00 60.00 72.00
Min. 32.40 40.40 42.40 48.40 54.10 58.10 70.10
S Max. 4.60 4.60 4.60 4.60 4.60 4.60 4.60
Min. 3.10 3.10 3.40 3.40 3.40 3.40 3.40
Weight Kg/1000pcs 20.3 31.3 33.2 44.7 54.8 61.4 89.7

High Strength Structural Nuts:

High Strength Structural Nuts - Dimensions
Thread Size M16 M20 (M22) M24 (M27) M30 M36
Pitch 2.0 2.50 2.50 3.00 3.00 3.50 4.00
W Max. 27.00 34.00 36.00 41.00 46.00 50.00 60.00
Min. 26.16 33.00 35.00 40.00 45.00 49.00 58.80
C Min. 29.56 37.29 39.55 45.20 50.86 55.37 66.44
H Max. 17.10 20.70 23.60 24.20 27.60 30.70 36.60
Min. 16.40 19.40 22.30 22.90 26.30 29.10 35.00
Weight Kg/1000pcs 60.4 115.3 142.8 197.7 282.3 365.0 281.8
Mechanical Properties of H.S.S. Nuts
Thread Size Property Class 8 Property Class 10
Proof Load Hardness Proof Load Hardness
Newtons Newtons
M16 168900 HRB 89
to
HRC 38
195500 HRB 26
to
HRC 38
M20 263400 305000
(M22) 325700 377200
M24 379500 439500
(M27) 493400 571500
M30 603100 698400
M36 878300 1017200

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