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Structural Bolts

Tension Control (TC) Bolt — ASTM F3125 F1852 / F2280

Twist-off tension control structural bolts with a round (button) head and spline end. The spline shears off when the installation tool reaches the design tension, giving visual confirmation of correct pre-tension. Supplied as complete sets per ASTM F3125 Grade F1852 / F2280 or Japanese S10T.

Standard
ASTM F3125 F1852 / ASTM F3125 F2280
Equivalents
JSS II 09 (S10T)
Sizes
M16 – M24; 5/8" – 1-1/8"
Lengths
40 – 200 mm
Grades
F1852 (A325 level), F2280 (A490 level), S10T
Materials
Alloy steel
Thread
Metric or UNC
MOQ
500 pcs per size (negotiable for trial orders)
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Finishes

FinishAppliedNotes
PlainAvailableFor customer-side coating
Zinc flake (Dacromet/Geomet type)AvailableElectrolyte-free, no hydrogen embrittlement risk
Mechanically galvanizedAvailableASTM B695, common for high-strength parts

For property class 10.9 and above, choose zinc flake, or zinc-nickel with hydrogen-embrittlement relief agreed at order stage.

Features

  • Visual installation check — spline shears off
  • One-side installation with electric shear wrench
  • Supplied as lubricated sets

Applications

  • High-rise steel frames
  • Bridges
  • Industrial buildings

Ordering terms

MOQ
500 pcs per size (negotiable for trial orders)
Mixed sizes
Welcome in one order
Samples
Samples available — cost and lead time quoted per request
Lead time
15–25 days for standard parts; finishes such as HDG or Dacromet add a few days
Payment
T/T 30% deposit, 70% before shipment
Shipping
FOB Ningbo / CIF / DDP on request
Packaging
Cartons on pallets, or private-label boxes and bags
Documents
Material certificate, coating thickness and salt-spray reports on request
Custom
Drawings, non-standard sizes, coatings, marking and private-label packaging

Tension Control Bolt FAQ

Are TC bolts supplied lubricated?
Yes, nuts are lubricated to control the torque-tension relationship; keep sets sealed until installation.

Request a quote for Tension Control Bolt

Tell us size, grade, finish and quantity. We reply with price and lead time within 24 hours.

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