Tightening torque of the high-strength bolt M22 40x "select"
The determination of the tension of the high-strength bolt is carried out according to the points listed below.
- The torque (tightening (tightening) moment) (N × m) when tensioning high-strength M24 bolts per nut should be determined by the formula:
- Mcr = 22 × P × K; where
- P = 220 kN - controlled tension of the bolt (22.16t)
- 7700 kg / cm² (design resistance of steel 40X)
- 0.95 - Coefficient of working conditions
- 3.03 calculated area of the bolt in the net section
- K-twist factor (taken from the manufacturer's certificate data). So, with a twisting factor of 0.175, the torque is equal to Mcr = 847 N × m. (86.4 kg × m). When tensioning high-strength bolts by their head, the torque value should be increased by 5%.
- Dissolution. At the specified length, weld on site after welding the belts and tightening the high-strength bolts to 50% controlled force.
- The number of high strength bolts, nuts and washers must be increased by 2% (taking into account possible losses).
- Processing of contact surfaces of joints on high-strength bolts - sandblasting.
- Steel grade of high-strength bolts 40x "select"
The mass of bolts of different types
A bolt with a hexagon head and a full screw thread (GOST 7798-70) is the most demanded fastener in the construction and machine-building industry, as well as when assembling furniture or repairing it. The bolt is produced in stainless steel and carbon steel, and also in brass. It has a foreign analogue according to DIN 933.
The weight of one bolt in grams depends on the size of the cap, its shape and the length of the bolt. The material also affects this indicator. The indicators below show how diverse hardware there are, and what weight they may have in grams:
- M6 - 4.71, M6x14 - 5.52, M6x16 - 5.93, M6x20 - 6.74, M6x25 - 7.87, M6x30 - 8.98, M6x35 - 10.09, M6x40 - 11.2, M6x45 - 12.31, M6x50 - 13.42, M6x55 - 14.53, M6x60 - 15.64, M6x65 - 16.76, M6x70 - 17.87, M6x75 - 18.98, M6x80 - 20.09, M6x85 - 21, 2, M6x90 - 22.31;
- M8x10 - 9.624, M8x14 - 11.08, M8x16 - 11.8, M8x20 - 13.25, M8x25 - 15.07, M8x30 - 17.35, M8x35 - 19.32, M8x40 - 21.3, M8x45 - 23, 27, M8x50 - 25.25, M8x55 - 27.22, M8x60 - 29.2, M8x65 - 31.17, M8x70 - 33.14, M8x75 - 35.12, M8x80 - 37.09, M8x85 - 39.07, M8x90 - 41.04, M8x95 - 43.02, M8x100 - 44.99;
- M16 - 68, M16x30 - 83, M16x40 - 97, M16x50 - 113, M16x60 - 129, M16x70 - 145, M16x80 - 161, M16x90 - 176, M16x100 - 192.
A bolt with a reduced head in the form of a hexagon (GOST 7796-70) is used for fastening structures for which the value of the head height is important
Steel 10, 20, 35, 35X, 40X, 30XR is used for manufacturing, accuracy class - B. Weight 1 pc. in grams:
- M10x10 - 13.57, M10x14 - 15.85, M10x16 - 16.99, M10x20 - 19.26, M10x25 - 22.11, M10x30 - 24.95, M10x40 - 31.25, M10x50 - 37.42, M10x60 - 43.59, M10x70 - 49.76, M10x80 - 55.93, M10x90 - 62.1, M10x100 - 68.27;
- M12 - 25.09, M12x16 - 26.73, M12x20 - 30.01, M12x30 - 38.21, M12x40 - 47.03, M12x50 - 55.92, M12x60 - 64.8, M12x70 - 73.69, M12x80 - 82.57, M12x90 - 91.46, M12x100 - 1003;
- M20x25 - 111, M20x30 - 123, M20x40 - 146, M20x50 - 169, M20x60 - 194, M20x70 - 218, M20x80 - 243, M20x90 - 268, M20x100 - 293
Eye bolts (GOST 4751-73) are used for lifting and rigging. The main feature of the hardware: instead of the head - a ring for attaching the cable. Steel for manufacturing - С15Е. It has a foreign analogue according to DIN 580. One eyebolt has a weight:
- M8 - 50 g;
- M10 - 120 g;
- М16х20 - 310 g;
- М20х24 - 500 g;
- М24х29 - 870
It is more convenient to bring the weight of larger hardware in kilograms:
- M30x37 - 1.58;
- М36х43 - 2.43;
- M42x50 - 3.72;
- M48x52 - 5.54;
- М56х60 - 8.09.
Butt bolts assembled (GOST 11530-93) - hardware with a round head and an oval headrest - are used for joining the rails of the railway track. One butt bolt weighs in grams:
- M22x135 - 448;
- М24х150 - 585;
- M27x130 - 696;
- М27х160 - 818.
Embedded bolt (GOST 16017-79) is designed to connect the washers made of metal or installation of rails on a reinforced concrete base. Embedded bolts are manufactured in 2 standard sizes, their weight in grams:
- М22х175 - 635;
- М22х225 - 1350.
Anchor bolts (GOST 24379-80) are used to fasten any structure on a supporting base. Weight of one anchor:
- M12x300 - 350, M12x400 - 440 g;
- M16x300 - 660, M16x600 - 1130, M16x900 - 1600, M16x1000 - 1730 g;
- M20 x400 - 1.32, M20x500 - 1.57, M20x900 - 2.55, M20x1000 - 2.8 kg;
- M24 - 2.35, M24x1000 - 4.13, M24x1500 - 5.9, M25x1700 - 6.61 kg;
- M48x900 - 17.41, M48x1000 - 18.83, M48x1500 - 25.93, M48x2000 - 33.03 kg.
High-strength bolts М24 (40x "select")
High strength bolt М24 - dimensions - stroyone
An example of a symbol for a bolt М24 × 130 (version 1) with thread diameter d = 24 mm, with "turnkey" size S = 36 mm, length L = 130 mm, with coarse thread 6g, strength class 5.8, uncoated
Bolt М24 - 6gx130.110 GOST 22353-77 *
| Nut weight (kg) | 0,171 | Package thickness with the length of the high-strength M24 bolt | ||
| Washer weight (kg) | 0,0758 | |||
| High strength bolt M24 | Bolt length (mm) | Bolt Weight (kg) | Kit weight (kg) | |
| M24 × 60 | 60 | 0,367 | 0,6896 | — |
| M24 × 65 | 65 | 0,386 | 0,7086 | 14 — 24 |
| M24 × 70 | 70 | 0,404 | 0,7266 | 19 — 29 |
| M24 × 75 | 75 | 0,421 | 0,7436 | 24 — 34 |
| M24 × 80 | 80 | 0,438 | 0,7606 | 29 — 39 |
| M24 × 85 | 85 | 0,456 | 0,7786 | 34 — 44 |
| M24 × 90 | 90 | 0,473 | 0,7956 | 39 — 49 |
| M24 × 95 | 95 | 0,491 | 0,8136 | 44 — 54 |
| M24 × 100 | 100 | 0,508 | 0,8306 | 55 — 59 |
| M24 × 105 | 105 | 0,525 | 0,8476 | 55 — 64 |
| M24 × 110 | 110 | 0,543 | 0,8656 | 60 — 69 |
| M24 × 115 | 115 | 0,56 | 0,8826 | 65 — 74 |
| M24 × 120 | 120 | 0,578 | 0,9006 | 70 — 79 |
| M24 × 125 | 125 | 0,595 | 0,9176 | 75 — 84 |
| M24 × 130 | 130 | 0,612 | 0,9346 | 80 — 89 |
| M24 × 140 | 140 | 0,646 | 0,9686 | 90 — 99 |
| M24 × 150 | 150 | 0,682 | 1,0046 | 100 — 109 |
| M24 × 160 | 160 | 0,714 | 1,0366 | 110 — 119 |
| M24 × 170 | 170 | 0,748 | 1,0706 | 120 — 129 |
| M24 × 180 | 180 | 0,783 | 1,1056 | 130 — 139 |
| M24 × 190 | 190 | 0,818 | 1,1406 | 140 — 149 |
| M24 × 200 | 200 | 0,853 | 1,1756 | 150 — 159 |
| M24 × 220 | 220 | 0,922 | 1,2446 | 170 — 179 |
| M24 × 240 | 240 | 0,992 | 1,3146 | 190 — 199 |
| M24 × 260 | 260 | 1,061 | 1,3836 | 210 — 219 |
| M24 × 280 | 280 | 1,131 | 1,4536 | 230 — 239 |
| M24 × 300 | 300 | 1,2 | 1,5226 | 250 — 259 |
How to calculate?
When buying 10-15 bolts, you do not need to know their weight, but if you need a large number, it will be easiest to place an order by weight: in kilograms or grams.
And you can also calculate the number of bolts available. To do this, you need to know how much one bolt weighs in theory, and have a balance available.
To convert the weight of the bolts from kg to pieces, you need to use the table of fasteners weights of different parameters. The calculation is based on the theoretical weight of one bolt based on the GOST standard. Divide the total weight by the weight of one bolt. Such calculations will be considered approximate, since the weight of the bolt is taken theoretically. When calculating, it is also worth considering that different grades of steel are used for the manufacture of hardware, respectively, and the strength class will also be different. To facilitate the counting process, there are special online calculators on the Internet that will help you convert pieces to kilograms and vice versa.
