15-5 Ph Stainless Steel Bolts manufactured at TorqBolt are high strength, good corrosion resistance, good mechanical properties at temperatures up to 600°F (316°C).
Dimensional standards as per DIN 931,DIN 933,BS 1768,UNI 5731,UNI 5737,UNI 5739,ISO 4014,ISO 4017,BS 1769,BS 3692 are provided.
The raw material of these fasteners is classified as Martensitic Precipitation Hardening stainless steel. Being a PED certified Fasteners Manufacturer by TUV Rheinland,our fasteners are accompanied with EN 10204 3.1/3.2 certification. 15-5PH Bolts are available in hot forged,cold forged and bar stock machined conditions depending upon the order quantity.
Alloy 15-5 Ph Is Also Known As Xm-12 .this Alloy Has Excellent Corrosion Resistance .
15 5 PH Stainless Steel bolts are externally threaded fasteners with an integral head, manufactured per ASME B18.2.1, ISO 4014/4017, and DIN 933/931. TorqBolt produces 15 5 PH Stainless Steel 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
15 5 PH Stainless Steel 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
15 5 PH Stainless Steel 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 15 5 PH Stainless Steel 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.
Precipitation-Hardening (PH) Stainless Steels
Precipitation-hardening (PH) stainless steels combine the corrosion resistance of austenitic stainless with the high strength of martensitic grades. A two-step heat treatment — solution anneal followed by ageing at 480-620°C — precipitates Cu, Ti, or Al-rich phases that lock the matrix at tensile strengths up to 1300 MPa with minimal distortion.
17-4 PH (UNS S17400 / AMS 5643) is the dominant grade: Cu-precipitation hardened, with corrosion roughly equivalent to AISI 304. Five standard ageing conditions H900 (highest strength), H925, H1025, H1075, H1150 trade strength against fracture toughness. 15-5 PH (S15500) is the through-thickness-tougher variant with reduced delta-ferrite. 13-8 PH (S13800) and 17-7 PH (S17700) are higher-strength variants for aerospace + spring fasteners.
PH fasteners are supplied per ASTM A693 / AMS 5643 with EN 10204 3.1 / 3.2 certification including hardness (HRC 32-48 by condition), tensile, and Charpy impact. NACE MR0175 service for PH grades is restricted to specific heat-treat conditions (H1150 only for 17-4) due to SSC susceptibility. Welding requires post-weld solution + age cycle to recover full strength.
