What material grade does Duplex 2507 U Bolts use?

Duplex 2507 U Bolts are manufactured per the applicable ASTM, ASME, DIN, or ISO specification for the material grade. TorqBolt provides material test certificates (MTC) per EN 10204 3.1 or 3.2 with every supply.

What sizes are available for Duplex 2507 U Bolts?

TorqBolt manufactures Duplex 2507 U Bolts in metric sizes M6 to M100 and imperial sizes 1/4" to 4" diameter, with custom lengths from 10mm to 3000mm. Non-standard sizes are available on request.

Are Duplex 2507 U Bolts NACE MR0175 / ISO 15156 certified?

Yes, Duplex 2507 U Bolts can be supplied with NACE MR0175 / ISO 15156-2/3 sour service certification when specified at order. Material certificates and test reports are provided.

What is the typical delivery time for Duplex 2507 U Bolts?

Standard stock items ship in 1-2 weeks. Custom manufactured Duplex 2507 U Bolts typically ship in 4-6 weeks depending on quantity, material availability, and certification requirements.

Do you provide third-party inspection for Duplex 2507 U Bolts?

Yes, third-party inspection by TUV, Lloyd's Register, BV, DNV, SGS, and Intertek is available upon request for Duplex 2507 U Bolts. Witness testing and stage inspections can be arranged.

Duplex 2507 U Bolts Manufacturer & Supplier

Duplex 2507 U Bolts Specification

The raw material of these fasteners is classified as Super Duplex Stainless Steel. Being a PED certified Fasteners Manufacturer by TUV Rheinland,our fasteners are accompanied with EN 10204 3.1/3.2 certification. Duplex 2507 U Bolts are available in hot forged,cold forged and bar stock machined conditions depending upon the order quantity.

Duplex 2507 U Bolts Equivalent Designation

UNS Designation	British STD	Werkstoff No.	European STD	Swedish STD	Japanese STD	Forging
S32750	–	1.4410	X2CrNiMoN25-7-4	2328	–	Sa 182 F53

Surface Treatments & Coatings

Electro Less Nickel Plating Bolts Electro Cadmium Plating Bolts Dacromet 320 500 Coating Bolts Pickled Passivated Fasteners Bolts Silver Plating Bolts Nickel Plating Bolts Electro Zinc Cobalt Plating Bolts Electro Zinc Nickel Plating Bolts Ptfe Fluorocarbon Coating Bolts Aluminizing Bolts Ceramic Filled Fluorocarbon Coating Bolts

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Duplex 2507 U Bolts — Specifications & Dimensions

Duplex 2507 U bolts are externally threaded fasteners with an integral head, manufactured per ASME B18.2.1, ISO 4014/4017, and DIN 933/931. TorqBolt produces Duplex 2507 U 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

Button head, flat head, countersunk — flush-mount applications

12-point flange — tool-engagement-critical assemblies

Thread & Shank

Duplex 2507 U 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

Duplex 2507 U 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 Duplex 2507 U 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.

Duplex & Super Duplex Stainless Steels

Duplex stainless steels have a roughly 50/50 ferrite-austenite microstructure, doubling the yield strength of austenitic 304/316 grades while improving chloride pitting + stress-corrosion resistance. Duplex is the modern default for offshore platform fasteners, desalination plants, and sour-gas piping where austenitics fail to chloride SCC and martensitics fail to hydrogen embrittlement.

Duplex 2205 (UNS S32205 / S31803) is the standard grade with PREN ~35, suitable for chloride-bearing service to ~250°C. Super Duplex 2507 (S32750) and Zeron 100 (S32760) push PREN to 41-42 with higher Cr+Mo+N, qualifying for the most aggressive seawater + sour-well environments. SA-182 F51 / F53 / F55 / F60 are the ASME forged-flange equivalents.

Phase balance is critical: ferrite content must stay within 35-65% in weld + HAZ to maintain corrosion + impact properties (ASTM A923 testing). Solution anneal at 1040-1100°C followed by water quench locks the duplex microstructure. Fasteners ship per ASTM A276 / A479 with EN 10204 3.1 / 3.2 certs including ferrite count and Charpy impact at -46°C. NACE MR0175 / ISO 15156 sour-service certification is standard.

Duplex 2507 U Bolts