TorqBolt is renowned for manufacturing and stocking weathering steel Astm A563 Grade C3 E Heavy Hex Nuts.
Astm A563 Grade C3 E Heavy Hex Nuts Properties
TorqBolt manufactures ASTM A563 Grade C3 E Heavy HEX Nuts 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 A563 Grade C3 E Heavy HEX Nuts batch is supplied with EN 10204 3.1 or 3.2 material test certificates.
ASTM A563 Grade C3 E Heavy Hex Nuts — Specifications & Dimensions
ASTM A563 Grade C3 E Heavy Hex nuts are internally threaded fasteners that mate with bolts and studs to form clamped joints. TorqBolt manufactures ASTM A563 Grade C3 E Heavy Hex nuts per ASME B18.2.2, ISO 4032/4033/4034, DIN 934/EN 24032, and DIN 6915 (heavy hex), in sizes M6–M100 and 1/4"–4".
Nut Height Categories
Standard / regular hex nut — ~0.875×D height, ASME B18.2.2 Type 1
Heavy hex nut — ~D height, full strength matched to bolt grade (A194 2H pattern)
Jam / thin nut — 0.5×D height, used as locknut against a primary nut
Coupling nut — long-form for joining two threaded rods
Cap / acorn nut — closed-end, decorative + thread protection
Locking Variants
For vibration-loaded joints, ASTM A563 Grade C3 E Heavy Hex nuts are available as nyloc (polymer insert), all-metal prevailing-torque (DIN 980, distorted-thread style), flange-serrated (DIN 6923, integral washer face with anti-back-off teeth), and castle / slotted (DIN 935, cotter-pin retention). Each locking style trades reusability against prevailing-torque retention.
Thread & Mechanical
ASTM A563 Grade C3 E Heavy Hex nut threads are gauged per ASME B1.1 / ISO 965 to Class 2B / 6H by default; high-strength variants use 3B / 4H6H. Proof-load testing per ASTM F606 verifies the nut can develop the bolt's full strength without thread strip; hardness range is controlled to prevent stress-corrosion susceptibility (HV 250–353 typical for high-grade nuts). Each lot is EN 10204 3.1 / 3.2 certified.
Special Patterns
TorqBolt also produces ASTM A563 Grade C3 E Heavy Hex nuts in weld-nut, T-nut, square-nut, knurled thumb-nut, and rivet-nut patterns. NACE MR0175 / ISO 15156 sour-service certification available; NORSOK M-650 qualified mills supplying high-temperature service grades.
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.
