High Strength Friction Grip (HSFG) bolts | Structure Bolts
HSFG / Structure Bolts- IS | ISO
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HSFG stands for High Strength Friction Grip where a traditional bolt will stop the plates in a connection from moving apart by supporting the weight on the bolt shank in the form of shear stress, an HSFG supports the weight by clamping the plates so tightly together that they cant slip past each other.
The main advantages of HSFG bolted connections are their greater stiffness and their ability to withstand alternating forces. Their behavior under fatigue loading is also better than that of bearing bolted connections. Against these advantages are the costs of HSFG bolted connections.
The bolts are tightened to a shank tension so that the transverse load across the joint is resisted by the friction between the plated rather than the bolt shank's shear strength. We dont use HSFG bolts often because theyre expensive and in most cases, they arent needed.
In other words, the friction generated between the plates is equal to the force being put on the plate by the weight of the beam it supports.
HSFG bolts are also commonly used in structures that will be exposed to a lot of vibrations, or loadings that will reverse. To make sure that the plates dont slip past each other, the bolt needs to be carefully preloaded. The area around the bolt needs to be clean and unpainted and the bolt then needs to be tightened to a precise level.
In general,
HSFG bolts are high-strength structural bolts that have been tightened such as to induce predefined tension in the bolt shank. They also will prevent any slip between the plates, which means your fastener wont come loose.
If you want to learn more, please visit our website Friction Bolt.
Annexure - I - Specifications - Table 1
Dia
M16x2
M20x2.5
M22x2.5
M24x3
s
15.30 - 16.70
19.16 - 20.84
21.16 - 22.84
23.16 - 24.84
d
26.16 - 27.00
33.00 - 34.00
35.00 - 36.00
40.00 - 41.00
h
9.25 - 10.75
11.60 - 13.40
13.10 - 14.90
14.10 - 15.90
t < 100
31
36
38
41
l > 100
38
43
45
48
Proof Load in N
8.8S
10.9S
Mechanical
Property: 8.8 or 10.9 as per ISO 898, IS (3)
Threads: ISO Metric 6g Class as per ISO 965, IS
Dia
M27x3
M30x3.5
M36x4
s
26.16 - 27.84
29.16 - 30.84
35.00 - 37.00
d
45.00 - 46.00
49.00 - 50.00
58.80 - 60.00
h
16.10 - 17.90
17.65 - 19.75
21.45 - 23.55
t < 100
44
49
56
l > 100
51
56
63
Proof Load in N
8.8S
10.9S
Annexure-II - Selection Chart for Bolt Length &
Weight (kg./ pcs.) - Table 2
Dia
M16
M20
M22
M24
Length
Grip Length
Weight
Grip Length
Weight
Grip Length
Weight
Grip Length
Weight
40mm
10 to 14
102.8
45mm
15 to 19
110.7
11 to 15
180.3
50mm
20 to 24
118.6
16 to 20
192.6
12 to 16
252.0
55mm
25 to 29
126.5
21 to 25
205.0
17 to 21
266.9
15 to 19
337.4
60mm
30 to 34
134.4
26 to 30
217.3
22 to 26
281.8
20 to 24
355.2
65mm
35 to 39
142.3
31 to 35
229.6
27 to 31
296.7
25 to 29
372.9
70mm
40 to 44
150.2
36 to 40
241.9
32 to 36
311.6
30 to 34
390.7
75mm
45 to 49
158.1
41 to 45
254.3
37 to 41
326.6
35 to 39
408.4
80mm
50 to 54
166.0
46 to 50
266.6
42 to 46
341.5
40 to 44
426.2
85mm
55 to 59
173.9
51 to 55
278.9
47 to 51
356.4
45 to 49
443.9
90mm
60 to 64
181.7
56 to 60
291.3
52 to 56
371.3
50 to 54
461.7
95mm
65 to 69
189.6
61 to 65
303.6
56 to 61
386.2
55 to 59
479.4
100mm
70 to 74
197.5
66 to 70
315.9
62 to 66
401.2
60 to 64
497.2
110mm
75 to 84
211.4
71 to 80
337.7
67 to 76
427.8
65 to 74
528.5
120mm
85 to 94
227.2
81 to 90
362.4
77 to 86
457.7
75 to 84
564.1
130mm
95 to 104
243.0
91 to 100
387.0
87 to 96
487.5
85 to 94
599.6
140mm
105 to 114
258.8
101 to 110
411.7
97 to 106
517.3
95 to 104
635.1
150mm
115 to 124
274.6
111 to 120
436.3
107 to 116
547.2
105 to 14
670.6
160mm
125 to 134
290.3
121 to 130
461.0
117 to 126
577.0
115 to 124
706.1
170mm
135 to 144
306.1
131 to 140
485.7
127 to 136
606.9
125 to 134
741.6
180mm
145 to 154
321.9
141 to 150
510.3
137 to 146
636.7
135 to 144
777.1
190mm
155 to 164
337.7
151 to 160
535.0
147 to 156
666.5
145 to 154
812.6
200mm
165 to 174
353.5
161 to 170
559.6
157 to 166
694.4
155 to 164
848.2
210mm
220mm
230mm
240mm
250mm
Dia
M27
M30
M36
Length
Grip Length
Weight
Grip Length
Weight
Grip Length
Weight
40mm
45mm
50mm
55mm
60mm
17 to 21
480.9
65mm
22 to 26
503.4
70mm
27 to 31
525.8
24 to 28
672.5
75mm
32 to 36
548.3
29 to 33
700.3
23 to 27
.1
80mm
37 to 41
570.8
34 to 38
728.0
28 to 32
.0
85mm
42 to 46
593.2
39 to 3
755.7
33 to 37
.0
90mm
47 to 51
615.7
44 to 48
783.5
38 to 42
.0
95mm
52 to 56
638.2
49 to 53
811.2
43 to 47
.9
100mm
57 to 61
660.7
54 to 58
839.0
48 to 52
.9
110mm
62 to 71
685.6
59 to 68
888.4
53 to 2
.0
120mm
72 to 81
730.6
69 to 78
943.9
63 to 72
.9
130mm
82 to 91
775.5
79 to 88
999.4
73 to 82
.8
140mm
92 to 101
820.5
89 to 98
.9
83 to 92
.7
150mm
102 to 111
865.4
99 to 108
.4
93 to 102
.6
160mm
112 to 121
910.4
109 to 118
.8
103 to 112
.5
170mm
122 to 131
955.3
119 to 128
.3
113 to 122
.4
180mm
132 to 141
.2
129 to 138
.8
123 to 132
.3
190mm
142 to 151
.2
139 to 148
.3
133 to 142
.2
200mm
152 to 161
.2
149 to 158
.8
143 to 152
.1
210mm
162 to 171
.2
159 to 168
.3
153 to 162
.0
220mm
172 to 181
.1
169 to 178
.8
163 to 172
.9
230mm
182 to 191
.0
179 to 188
.3
173 to 182
.8
240mm
192 to 201
.0
189 to 198
.8
183 to 192
.7
250mm
202 to 211
.0
199 to 208
.3
193 to 202
.6
260mm
212 to 221
.9
209 to 218
.7
203 to 212
.5
270mm
222 to 231
.9
219 to 228
.2
213 to 222
.4
280mm
232 to 241
.8
229 to 238
.7
223 to 232
.3
290mm
242 to 251
.9
239 to 248
.2
233 to 242
.2
300mm
252 to 261
.9
249 to 258
.7
243 to 252
.1
High Strength Friction Grip Bolts - Structural Bolt Manufacturer
What is HSFG Bolt
High-Strength Friction Grip Bolts, or HSFG bolts, are bolts engineered for exceptional strength. Their load-bearing capacity surpasses that of ordinary bolts of the same specifications. The term friction grip highlights a key distinction these bolts rely on intentional pre-tensioning during tightening, generating significant frictional forces perpendicular to the screw direction. This friction, in turn, facilitates the transmission of shear forces during the connection process.
Structural Variances of HSFG Bolt
While the general shape and connection structure of HSFG bolts mirror those of ordinary bolts, the primary distinction lies in their operational principles. Ordinary bolts transmit shear forces through the rods compression and shear resistance, with minimal consideration for the pre-tension generated during tightening. In contrast, HSFG bolts intentionally apply substantial pre-tension, creating compression forces between the connected surfaces. This compression results in significant friction forces, essential for transferring shear forces in the connection.
Contact us to discuss your requirements of Mesh Bolt. Our experienced sales team can help you identify the options that best suit your needs.
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