Fastener Guide / Technical Reference

F2280 Tension-Control Assemblies

F2280 is the twist-off tension-control structural bolt at A490 strength. Same installation idea as F1852, with A490 coating and reuse restrictions.

Last reviewed 2026-09-10 · Governing standard: ASTM F3125/F3125M-26; RCSC Specification · reference FG-B4F37A · Report an error on this sheet

Structural bolting: pretensioned and slip-critical joints are installed to the RCSC Specification and the project documents, not to a generic torque chart. The engineer of record governs.

How a TC bolt works

HeadRound (button) head, no wrench flats
TailSpline end twists off at the designed installation tension
ToolElectric shear wrench holds the spline and turns the nut
Supplied asBolt, nut and washer assembly from matched lots
VerificationPre-installation testing per RCSC before use

Strength

GradeTensile (min)Equivalent to
F1852120 ksiA325
F2280150 - 173 ksiA490

These tables carry the same figures as the printed sheet below.

The printed sheet

F2280 Tension-Control Assemblies

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Tell us what is wrong.

Text version of this sheet

ASTM F3125 · Grade F2280 · A490-strength tension-control bolt

What it is

FIELD IDENTIFICATION

F2280 is the twist-off tension-control structural bolt at A490 strength. Same installation idea as F1852,

with A490 coating and reuse restrictions.

MFG

A490

Round head, spline end twists off at tension

How a TC bolt works

Head

Round (button) head, no wrench flats

Tail

Spline end twists off at the designed installation tension

Tool

Electric shear wrench holds the spline and turns the nut

Supplied as

Bolt, nut and washer assembly from matched lots

Verification

Pre-installation testing per RCSC before use

Strength

Grade

Tensile (min)

Equivalent to

F1852

120 ksi

A325

F2280

150 - 173 ksi

A490

Key points

No hot-dip galvanizing or electroplating at A490 strength.

Spline gone = tensioned; spline on = not installed.

Governing standards: ASTM F3125/F3125M-26; RCSC Specification. Editions shown are the latest confirmed as of September 2026. The drawing and the governing standard always

take precedence over this sheet.

torquing any fastener. Verify the current governing standard, project documents, OEM requirements, size, thread, coating and lot certification. To the fullest extent permitted by law, The Fastener App disclaims liability

arising from reliance on this reference.

Fastener Guide reference FG-B4F37A · thefastenerapp.com/fastener-guide/technical-reference/f2280-tension-control-assemblies · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.

Related sheets

← F1852 Tension-Control AssembliesASTM A563 Structural Nuts →

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