Tension Control Bolts
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Tension Control Bolts, in like way called TC Bolts, A325 TC(ASTM F1852) or A490 TC(ASTM F2280) stuns, have an augmentation that is wrinkled (hinted as the spline) that is relied upon to guarantee correct, repeatable, and obvious sign of real weight levels with every establishment.
Tension control screws have a catch head rather than the hex head of standard major bolts and dependably come as a party with a nut and washer. They require an electric shear torque to exhibit. To accomplish the right weight, the torque turns the nut clockwise, while turning the spline counterclockwise. Right when the correct weight level is practiced the spline snaps off – giving obvious, repeatable, and visual sign of right Tension levels.
Tension Control Bolts, TC Bolts or Twist Off Boltsare now the most standard decision in first class associate affecting and formally observed by the AISC (American Institute of Steel Construction) and the RCSC (Research Council on Structural Connections) as a grasped establishment method
A Tension Control Bolts includes 1 hook, 1 nut and 1 washer, pre-aggregated and there for they are appeared, 1 disperse, on the verification printed material. Weight Control Bolts congregations run with their own one of a kind comprehended Tension control gadget (spline) to guarantee strong and repeatable Tension levels are developed with every establishment. They are given an unequivocal electric shear torque that has an external association that turns the nut counterclockwise, while getting the spline with the interior association turning it clockwise. Right when the best weight level has been developed the spline snaps off giving you a visual sign of true establishment.
TC bolts utilize a first class oil on the nut, to control the getting power of the screw and affirmation the fitting Tension level is developed. Due to this prohibitive oil, it isn't sensible to re-lube up TC stuns, in the field, just the make of a TC stun can re-oil up a TC get together.
Tension Control Bolts Specification
| 120 ksi - A325 (Hex) & F1852 (Twist-Off) | 150 ksi - A490 (Hex) & F2280 (Twist-Off) | |||||||
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| Diameter | Stress Area in ² | Tensile min lbf | Proof Load min lbf | Proof Load min lbf | Tensile min lbf | Tensile max lbf | Proof Load min lbf | Proof Load min |
| 1/2" | 0.142 | 17,050 | 12,050 | 13,050 | 21,300 | 24,600 | 17,050 | 18,500 |
| 5/8" | 0.226 | 27,100 | 19,200 | 20,800 | 33,900 | 39,100 | 27,100 | 29,400 |
| 3/4" | 0.334 | 40,100 | 28,400 | 30,700 | 50,100 | 57,800 | 40,100 | 43,400 |
| 7/8" | 0.462 | 55,450 | 39,250 | 42,500 | 69,300 | 79,950 | 55,450 | 60,100 |
| 1" | 0.606 | 72,700 | 51,500 | 55,700 | 90,900 | 104,850 | 72,700 | 78,800 |
| 1-1/8" | 0.763 | 91,600 | 64,900 | 70,250 | 114,450 | 132,000 | 91,600 | 99,200 |
| 1-1/4" | 0.969 | 116,300 | 82,400 | 89,200 | 145,350 | 167,650 | 116,300 | 126,000 |
| 1-3/8" | 1.155 | 138,600 | 98,200 | 106,300 | 173,250 | 199,850 | 138,600 | 150,200 |
| 1-1/2" | 1.105 | 168,600 | 119,500 | 129,300 | 210,750 | 243,100 | 168,600 | 182,600 |
| Above values based on | 120,000psi | 85,000psi | 92,000psi | 150,000psi | 173,000psi | 120,000psi | 130,000psi | |
| Source: ASTM F3125-15 | ||||||||
ASTM F1852 & F2280 Dimensions for TC Bolts
| Diameter | Height (H) | Bearing Surface Diameter (D) | Length of Spline (LS) | Width Across Flats (S) | |
|---|---|---|---|---|---|
| Max | Min | Min | REFERENCE ONLY | REFERENCE ONLY | |
| 5/8 | 0.403 | 0.378 | 1.102 | 06 | 0.43 |
| 3/4 | 0.483 | 0.455 | 1.338 | 065 | 0.53 |
| 7/8 | 0.563 | 0.531 | 1.535 | 0.72 | 0.16 |
| 1 | 0.627 | 0.591 | 1.771 | 0.8 | 0.7 |
| 1-1/8 | 0.718 | 0.658 | 1.991 | 0.9 | 0.8 |
Tension Control Bolts Material & Grade
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Carbon Steel Tension Control Bolts
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Alloy Steel Tension Control Bolts
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Inconel Tension Control Bolts
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Monel Tension Control Bolts
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Hastelloy Tension Control Bolts
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Titanium Tension Control Bolts
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Tension Control Bolts As Per ASTM Specification
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Tension Control Bolts As Per DIN Specification
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