ALLOY 20 Eye Bolts manufactured at TorqBolt are corrosion resistant,high temperature resistant with ultimate tensile strength.
Dimensional standards as per DIN 580,ISO 3266, are provided.
The raw material of these fasteners is renowned as registered trademarks like Carpenter® 20, 20CB-3®. Being a PED certified Fasteners Manufacturer by TUV Rheinland,our fasteners are accompanied with EN 10204 3.1/3.2 certification. ALLOY 20 Eye Bolts are available in hot forged,cold forged and bar stock machined conditions depending upon the order quantity.
Alloy 20 Eye bolts are externally threaded fasteners with an integral head, manufactured per ASME B18.2.1, ISO 4014/4017, and DIN 933/931. TorqBolt produces Alloy 20 Eye 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
Alloy 20 Eye 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
Alloy 20 Eye 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 Alloy 20 Eye 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.
Super-austenitic stainless steels are high-molybdenum (Mo ≥ 6%), high-nitrogen austenitic alloys positioned above the 316L envelope but below nickel-alloy cost. They deliver chloride-pitting resistance approaching duplex grades while retaining the formability and weldability of austenitic structure — ideal for seawater + flue-gas-desulfurization service.
254 SMO (UNS S31254) is the benchmark with PREN ~43, formulated for the most aggressive chloride + sulfuric acid service. 904L (N08904) is the original 4.5% Mo super-austenitic, widely specified for sulfuric-acid plants. Alloy 20 (N08020) is a Cu-bearing variant optimized specifically for hot sulfuric acid (50-80%) where standard austenitics fail rapidly. AL-6XN (N08367) and 654 SMO (S32654) extend service to higher pitting resistance with 6.5%+ Mo.
Super-austenitic fasteners are supplied per ASTM A276 / A479 with EN 10204 3.1 / 3.2 certification including pitting-resistance testing per ASTM G48 Method A at the temperature appropriate for the alloy. Welding requires Ni-base filler (alloy 625 / C-276) to avoid molybdenum segregation in the weld pool that would create preferential corrosion sites. NACE MR0175 sour-service certification is standard.
