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Europe
- F3125 F1852 (Group 120) and F2280 (Group 150)
- EN 14399-10 HRC, JSS II 09 S10T
- Installed from one side, by one worker
- Spline shears off at the design tension
- Visual inspection of every bolt
- Quiet electric shear wrench
How it works
A TC bolt has a domed head and a splined end. The shear wrench holds the spline and turns the nut; when the bolt tension reaches the calibrated value the spline twists off at its groove. A missing spline is a visible, permanent record that the bolt was tensioned.
TC bolts save time on large bolted structures – multi-storey frames, bridges and long-span roofs – and remove impact-wrench noise from the site.
Grades
| Standard | Grade | Strength | Market |
|---|---|---|---|
| ASTM F3125 F1852 | Group 120 | 120 ksi | US |
| ASTM F3125 F2280 | Group 150 | 150 ksi | US |
| EN 14399-10 | HRC 10.9 | 1040 MPa | Europe |
| JSS II 09 | S10T | 1000 MPa | Japan, Asia |
| GB/T 3632 | 10.9S | 1040 MPa | China |
Installation notes
- Pre-installation verification of each lot in a tension calibrator
- Keep bolts in their sealed containers – lubrication controls the tension
- Snug all bolts first, then twist off in a pattern from the stiffest part of the joint
- Do not re-use bolts that have been tensioned
Standards and requirements by market
Codes World Steel designs, fabricates and documents this product to – and the key geometric and load requirements in each market.
United States
- ASTM F3125Grades F1852 / F2280
- RCSC 2020Twist-off-type tension-control bolt pretensioning
Summary for orientation only – the project specification, the adopted code edition and the authority having jurisdiction govern.
Finishes
| Finish | Standards / notes |
|---|---|
| Plain / black | Oiled, for painted or indoor connections |
| Mechanical zinc | F1852 (Group 120) only |
