Tension Control (TC) Bolts | ASTM F1852, F2280 & EN 14399-10 | Twist-Off Bolts | High-Strength Structural Bolts

Hebei Longze is a premier manufacturer of high-precision Tension Control (TC) Bolts, providing the industry's most reliable solution for high-strength structural steel connections. Our Twist-Off Bolts are meticulously produced in accordance with ASTM F1852, ASTM F2280, et EN 14399-10 standards, ensuring that every joint achieves the exact required pre-load without the need for manual torque calibration.

The innovative design of the TC Bolt features a spline end that is gripped by a specialized electric shear wrench. Once the bolt reaches the correct tension, the spline "twists off," providing an immediate visual confirmation of proper installation. This Preloaded fastening system significantly reduces labor costs by allowing for single-operator installation and eliminating the risk of over-tightening or under-tightening. We offer these fasteners in High-Tensile Carbon Steel with Geomet, Dacromet, ou Hot Dip Galvanized (HDG) finishes to withstand extreme environmental conditions. Whether you are constructing a high-rise bridge or a heavy-duty industrial facility, Longze Tension Control Bolts deliver the structural safety and efficiency your engineering demands.

• Standards: ASTM F1852 (A325 equivalent), ASTM F2280 (A490 equivalent), EN 14399-10 (HRC).

• Material: High-Tensile Alloy Steel (Grade 10.9, 10.9S).

• Head Type: Round Head (Dome Head) with Spline End.

• Assembly: Includes 1 Bolt + 1 Nut + 1 Hardened Washer (Complete Set).

• Size Range: M16 - M36 (Metric) | 5/8" - 1-1/8" (Imperial).

• Surface Treatment: Black Oxide, Zinc Plated, Dacromet, Hot Dip Galvanized (HDG).

• Application: High-Rise Buildings, Steel Bridges, Power Plant Construction, Stadium Roof Structures, Heavy Industrial Framing.