Structural bolts & fasteners

Tension control (TC) bolts – twist-off

Twist-off tension control bolts – ASTM F3125 Grade F1852 / F2280, EN 14399-10 HRC and JSS II 09 S10T – installed by shear wrench from one side.

Stati Uniti Europa

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Round head tension control bolt with spline and nut

TC bolts in a splice, two splines sheared off

Installed TC bolts – sheared splines show full tension.

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

TC bolt standards
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

Norme e requisiti per mercato

I codici secondo cui World Steel progetta, fabbrica e documenta questo prodotto, con i principali requisiti geometrici e di carico in ciascun mercato.