A490M is the higher-strength member of the ASTM structural bolt family and we hold it in Umm Al Quwain from M12 to M56 (½" to 2½") in black finish with A563 DH nuts and F436 washers, imported from approved mills with full certification. Use it where the connection is sized for 150 ksi bolts; use A325M where galvanizing is required.
ASTM F3125 Grade A490 is a heavy hex structural bolt of quenched-and-tempered alloy steel with 150–173 ksi tensile strength — about 25% stronger than A325 — with both a minimum and a maximum tensile specified to limit brittle fracture risk. The imperial grade matches ASTM A354 BD; the metric grade matches property class 10.9. A490 bolts must not be hot-dip galvanized or electroplated because of hydrogen embrittlement, so they are supplied black or with an approved zinc-aluminium coating.
Applications
- Heavily loaded beam-to-column and splice connections
- Bridge girders and truss chords
- Crane girders and heavy industrial frames
- Stadium and long-span roof structures
- Offshore and jacket structure connections
- Mining and bulk-handling structures
Standards, grades & finishes
Bolts to ASTM F3125 / F3125M Grade A490 / A490M Type 1, dimensions to ASME B18.2.6 / B18.2.6M, nuts to ASTM A563 Grade DH / 10S, washers to ASTM F436. Supplied plain (black, lightly oiled); zinc-aluminium (Geomet / Magni) coating on request. Assemblies as matched lots. Equivalent to EN 14399-3 HR 10.9 for many European specifications.
This item is imported from approved mills and held in stock in our Umm Al Quwain warehouse alongside the anchor bolts, studs and plate washers we manufacture ourselves, so complete bolt sets ship from one source. Tensile, hardness and chemical testing is carried out by independent UAE-accredited laboratories, and EN 10204 3.1 certificates are issued with every batch. We supply across the GCC, MENA and Africa.