TorqBolt is renowned for manufacturing and stocking structural steel Astm A490 Type 1 Bolts.
Astm A490 Type 1 Bolts Properties
TorqBolt manufactures ASTM A490 Type 1 Bolts via cold forging, hot forging and CNC machining. Sizes range from M1.0 to M100 (metric) and 1/16" to 4" (imperial). Available in coarse, fine, UNC, UNF, UN, BSW and acme threads with half, full or double-end thread configurations. Each ASTM A490 Type 1 Bolts batch is supplied with EN 10204 3.1 or 3.2 material test certificates.
ASTM A490 Type 1 Bolts — Specifications & Dimensions
ASTM A490 Type 1 bolts are externally threaded fasteners with an integral head, manufactured per ASME B18.2.1, ISO 4014/4017, and DIN 933/931. TorqBolt produces ASTM A490 Type 1 bolts in metric (M6–M100) and imperial (1/4"–4") diameters with custom lengths from 10 mm up to 3000 mm.
Head Styles Available
Hex head — ASME B18.2.1, the workhorse for general bolting
Heavy hex head — thicker head for high-load joints, ASTM A325 / A490 patterns
Socket head cap (SHCS) — ASME B18.3 / DIN 912, ideal where space is limited
ASTM A490 Type 1 bolts are supplied with full or partial threading. Full-thread (UNC, UNF, ISO metric coarse/fine) for tension-only joints; partial-thread shank for shear loads where the unthreaded grip carries the load. Thread fits per ASME B1.1 (Class 2A) or ISO 965 (6g) by default; tighter Class 3A / 4h6h fits available on request. Engagement length follows the 1.5×D rule for tapped holes; 1.0×D minimum on through-bolting.
Mechanical Performance
ASTM A490 Type 1 bolts achieve characteristic tensile strength, yield, and elongation per the source-material spec, with proof-load testing and hardness verification per ASTM F606 / ISO 898-1. Torque-tension calibration is published per ASME PCC-1 for critical joints. Each lot ships with EN 10204 3.1 (or 3.2 on request) certificates listing chemistry, mechanicals, hardness, and dimensional inspection.
Custom Configurations
TorqBolt can produce ASTM A490 Type 1 bolts to drawing, with non-standard heads, drilled-shank variants, double-end, captive, or matched-set configurations. Coatings include zinc, PTFE, Xylan, hot-dip galvanized, and electroless nickel. NACE MR0175 / ISO 15156 sour-service certification on request.
ASTM Carbon & Alloy Steel Bolting Specifications
The ASTM A193 / A194 / A320 / A325 / A490 / F568 family covers the dominant carbon and low-alloy steel bolting standards for pressure vessels, structural steel, and high-temperature service. Each spec defines composition, heat-treat condition, mechanicals, and acceptance testing per the application's safety classification.
ASTM A193 Grade B7 is the workhorse: AISI 4140 chrome-moly steel, quench + temper to yield 105 ksi min, the default for ASME flanged-joint stud bolts to 500°C. Grade B7M is hardness-controlled (≤ HRC 22) for sour service per NACE MR0175. Grade B16 uses Cr-Mo-V chemistry for service to 600°C (steam-turbine bolting). ASTM A320 L7 / L7M / L43 are the cryogenic-service variants tested per Charpy V-notch at -101°C (-150°F). ASTM A194 grade 2H / 7 / 7M / 16 are the matching nut grades.
ASTM A325 / A490 are the structural-steel high-strength bolts for buildings + bridges. ASTM F568 class 8.8 / 10.9 / 12.9 covers the metric high-strength bolt grades. EN 10204 3.1 / 3.2 certificates standard, with hardness, tensile, Charpy impact, and through-hardening checks per the lot release procedure.
