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Alternative to traditional bolt tightening, manual operation and no need for high torque generating equipment.
Blackiron mechanical nuts (also known as multi-socket bolt tensioners) are versatile, durable and comply with the highest manufacturing standards. They allow main bolts to be tensioned without the use of specialized bolt tensioning equipment. By tightening the jacks (surrounding bolts) to a predetermined force, thereby applying a residual load to the main bolt.
Load capacity up to 6100 kN, can be designed with special materials on request.
| Metric | Size | TPI disponibili | Nut body | Jackbolt | Hardened washer | Height | Weight | Preload | Torque | Preload capacity | |||||
| Thread | 1 | 2 | 3 | tot | approx | nom | nom | max | |||||||
| Part number | D | P1 | P2 | P3 | D1 | H | n | SW | Ds | S | L | F | M | ||
| [M] | [mm] | [mm] | [mm] | [mm] | [mm] | [mm] | [kg] | [kN] | [Nm] | [kN] | |||||
| BMTM016-XX | 16 | 2 | 1,5 | 1 | 34 | 18 | 5 | 5 | 33 | 3 | 34 | 0,11 | 65 | 14 | 94 |
| BMTM020-XX | 20 | 2,5 | 1,5 | 1 | 38 | 18 | 7 | 5 | 38 | 4 | 35 | 0,14 | 98 | 14 | 140 |
| BMTM022-XX | 22 | 2,5 | 1,5 | 1 | 41 | 18 | 5 | 7 | 41 | 4 | 37 | 0,16 | 125 | 14 | 140 |
| BMTM024-XX | 24 | 3 | 2 | 1,5 | 44 | 18 | 6 | 7 | 44 | 4 | 37 | 0,19 | 145 | 14 | 185 |
| BMTM027-XX | 27 | 3 | 2 | 1,5 | 50 | 24 | 8 | 7 | 50 | 5 | 44 | 0,35 | 190 | 36 | 285 |
| BMTM030-XX | 30 | 3,5 | 2 | 1,5 | 53 | 24 | 9 | 7 | 53 | 5 | 44 | 0,37 | 230 | 36 | 285 |
| BMTM033-XX | 33 | 3,5 | 2 | 1,5 | 59 | 24 | 7 | 9 | 59 | 5 | 45 | 0,48 | 285 | 36 | 380 |
| BMTM036-XX | 36 | 4 | 3 | 1,5 | 66 | 32 | 8 | 9 | 66 | 6 | 56 | 0,76 | 335 | 72 | 460 |
| BMTM039-XX | 39 | 4 | 3 | 1,5 | 70 | 32 | 9 | 9 | 70 | 6 | 56 | 0,9 | 390 | 72 | 525 |
| BMTM042-XX | 42 | 4,5 | 3 | 1,5 | 75 | 38 | 7 | 11 | 73 | 6 | 65 | 1,01 | 455 | 72 | 585 |
| BMTM045-XX | 45 | 4,5 | 3 | 1,5 | 83 | 38 | 9 | 11 | 81 | 6 | 65 | 1,48 | 540 | 131 | 750 |
| BMTM048-XX | 48 | 5 | 3 | 1,5 | 85 | 38 | 9 | 11 | 85 | 6 | 65 | 1,5 | 585 | 131 | 750 |
| BMTM052-XX | 52 | 5 | 3 | 2 | 94 | 41 | 8 | 12 | 89 | 6 | 68 | 1,8 | 635 | 131 | 935 |
| BMTM056-XX | 56 | 5,5 | 4 | 2 | 100 | 41 | 9 | 12 | 95 | 8 | 70 | 2 | 710 | 131 | 935 |
| BMTM060-XX | 60 | 5,5 | 4 | 2 | 107 | 41 | 10 | 12 | 100 | 8 | 70 | 2,3 | 790 | 131 | 1170 |
| BMTM064-XX | 64 | 6 | 4 | 2 | 113 | 53 | 9 | 13 | 112 | 8 | 88 | 3,65 | 1040 | 315 | 1405 |
| BMTM068-XX | 68 | 6 | 4 | 2 | 117 | 53 | 10 | 13 | 117 | 8 | 88 | 3,85 | 1160 | 315 | 1565 |
| BMTM072-XX | 72 | 6 | 4 | 2 | 120 | 53 | 10 | 13 | 120 | 8 | 88 | 4 | 1160 | 315 | 1565 |
| BMTM076-XX | 76 | 6 | 4 | 2 | 132 | 56 | 13 | 15 | 127 | 8 | 90 | 5,1 | 1600 | 315 | 2340 |
| BMTM080-XX | 80 | 6 | 4 | 2 | 132 | 56 | 12 | 15 | 127 | 8 | 90 | 4,8 | 1790 | 315 | 2340 |
| BMTM085-XX | 85 | 6 | 4 | 2 | 137 | 56 | 12 | 15 | 137 | 8 | 90 | 5,1 | 1890 | 315 | 2340 |
| BMTM090-XX | 90 | 6 | 4 | 2 | 145 | 65 | 16 | 15 | 140 | 8 | 102 | 6 | 2300 | 315 | 3120 |
| BMTM100-XX | 100 | 6 | 4 | 2 | 164 | 65 | 16 | 15 | 160 | 8 | 102 | 7,8 | 2520 | 315 | 3120 |
| BMTM110-XX | 110 | 6 | 4 | 2 | 177 | 84 | 16 | 17 | 172 | 10 | 125 | 11,4 | 3110 | 645 | 3925 |
| BMTM120-XX | 120 | 6 | 4 | 2 | 189 | 84 | 18 | 17 | 179 | 10 | 125 | 13 | 3500 | 645 | 4660 |
| BMTM125-XX | 125 | 6 | 4 | 2 | 194 | 84 | 20 | 17 | 190 | 10 | 125 | 13,5 | 3890 | 645 | 4905 |
| BMTM130-XX | 130 | 6 | 4 | 2 | 205 | 94 | 22 | 17 | 202 | 10 | 137 | 17,5 | 4280 | 645 | 5395 |
| BMTM140-XX | 140 | 6 | 4 | 2 | 215 | 94 | 24 | 17 | 215 | 10 | 137 | 18,7 | 4670 | 645 | 5890 |
| BMTM150-XX | 150 | 6 | 4 | 2 | 225 | 107 | 24 | 19 | 225 | 12 | 162 | 20 | 6100 | 645 | 7000 |
| BMTM160-XX | 160 | 6 | 4 | – | 234 | 107 | 24 | 19 | 234 | 12 | 162 | 24,1 | 6100 | 645 | 7230 |
