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Structural Bolts

ASTM A490 Heavy Hex Structural Bolt

High-strength heavy hex structural bolt to ASTM A490 (now ASTM F3125 Grade A490), alloy steel quenched and tempered to 150–173 ksi tensile strength. Because of its strength level A490 must not be hot-dip galvanized or electroplated; it is supplied plain or with an approved zinc flake coating.

Standard
ASTM A490 / ASTM F3125
Equivalents
ASTM A490M
Sizes
1/2" – 1-1/2"
Lengths
1-1/2" – 8"
Grades
A490 Type 1
Materials
Alloy steel, quenched and tempered
Thread
UNC 2A
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
Black oxide / phosphateAvailableIndoor or oiled service

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

Features

  • Higher tensile strength than A325
  • No galvanizing — embrittlement risk
  • Matched A563 DH nuts and F436 washers

Applications

  • Heavily loaded steel connections
  • Bridges
  • Industrial plant structures

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

ASTM A490 Bolt FAQ

Can A490 bolts be galvanized?
No. ASTM prohibits hot-dip galvanizing and electroplating of A490 because of hydrogen embrittlement risk. Use plain or approved zinc flake.

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Related products

ASTM A325 Bolt – representative photo

ASTM A325 Heavy Hex Structural Bolt

A563 DH Heavy Hex Nut – representative photo

ASTM A563 Grade DH Heavy Hex Nut

ASTM F436 Washer – representative photo

ASTM F436 Hardened Structural Washer

DIN 6914 HV Bolt – representative photo

DIN 6914 HV Structural Bolt (EN 14399-4)

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