What material grade does Duplex 2507 Spring Washers use?

Duplex 2507 Spring Washers 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 Spring Washers?

TorqBolt manufactures Duplex 2507 Spring Washers 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 Spring Washers NACE MR0175 / ISO 15156 certified?

Yes, Duplex 2507 Spring Washers 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 Spring Washers?

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

Do you provide third-party inspection for Duplex 2507 Spring Washers?

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

Duplex 2507 Spring Washers Supplier

Duplex 2507 Spring Washers 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 Spring Washers are available in hot forged,cold forged and bar stock machined conditions depending upon the order quantity.

Duplex 2507 Spring Washers 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 Washers Electro Cadmium Plating Washers Dacromet 320 500 Coating Washers Pickled Passivated Fasteners Washers Silver Plating Washers Nickel Plating Washers Electro Zinc Cobalt Plating Washers Electro Zinc Nickel Plating Washers Ptfe Fluorocarbon Coating Washers Aluminizing Washers Ceramic Filled Fluorocarbon Coating Washers

Related Products

Duplex 2205 Washers Duplex 31803 Washers Super Duplex 32750 Washers Super Duplex 32760 Washers Ferralium Washers Ferralium 255 FG46 Washers S32205 Washers S31803 Washers S32750 Washers S32760 Washers S32950 Washers S32520 Washers SA 182 F60 Washers SA 182 F51 Washers Duplex 2507 Washers Zeron 100 Washers Sa 182 F55 Washers SA 182 F61 Washers 12 Point Flange Bolt Allen Screw Anchor Bolts Carriage Bolts Custom Bolts Draw Bolts Elevator Bolts Eye Bolts Flange Bolts Hanger Bolts Heavy Hex Head Bolts Hex Head Bolts J Bolts Lag Bolts Machine Bolts Plow Bolts Shoulder Bolts Step Bolts Stove Bolts Stud Bolts Tap Bolts U Bolts Double End Stud Bolts Full Threaded Studs Bolts Half Threaded Studs Bolts Tap End Studs 12 Point Flange Nuts Acorn Nuts Cap Nuts Castle Nuts Coupling Nuts Doomed Nuts Flange Lock Nuts Flex Lock Nuts Heavy Hex Nuts Hex Nuts High Nuts Jam Nuts Kep Nuts Nuts Nylon Lock Nuts Serrated Flange Nuts Slotted Nuts Square Nuts T Nut T Nuts Wing Nuts Belleville Washers Bowed Spring Washers Conical Spring Washers Countersunk Washers Curved Spring Washers Dock Washers Dome Tooth Washers Dome Washers External Lock Washers Fender Washers Finger Spring Washers Flat Washers Hex Washers Hexagonal Washers Internal Lock Washers Lock Washers Ogee Washers Plain Washers Split Lock Washers Spring Washers Square Washers Tab Washers Tooth Lock Washers Torque Washers Wave Spring Washers

Duplex 2507 Spring Washers — Specifications & Dimensions

Duplex 2507 Spring washers distribute clamp load over a wider bearing area, prevent surface damage, and accommodate bolt-hole oversize. TorqBolt manufactures Duplex 2507 Spring washers per ASME B18.21.1 / B18.22.1, DIN 125 / 126 / 127 / 9021, and ISO 7089 / 7090 / 7093 / 7094, in metric (M3–M100) and imperial (#4–4") sizes.

Plain Washer Dimensions

Duplex 2507 Spring plain washers are characterized by three critical dimensions: ID (clearance over bolt diameter), OD (load distribution area), and thickness (compressive stiffness). Standard tolerances are h13 on OD and H13 on ID per ISO 286-2; flatness 0.05 mm/100 mm and parallelism 0.05 mm/100 mm verified per lot. Edge break / chamfer per drawing.

Form Variants

Form A (regular) — DIN 125-A / ISO 7089, the default plain washer

Form B (large OD) — DIN 9021 / ISO 7093, for soft mating surfaces

Form C (heavy) — DIN 7349 / ISO 7094, for slotted holes / structural use

Spring (split) — DIN 127 / ASME B18.21.1, helical anti-vibration

Tooth lock (internal / external) — DIN 6797 / 6798, anti-rotation

Conical / Belleville (DIN 6796 / 2093) — preload maintenance

Hardness & Surface

Duplex 2507 Spring washers are hardness-controlled to balance load-distribution stiffness against surface damage to mating parts. Typical Vickers HV ranges: plain 140–180 HV; spring 380–440 HV; Belleville 460–540 HV. Surface finish Ra 1.6 µm or better; on critical sealing applications, Ra 0.8 µm available.

Special Patterns

TorqBolt produces Duplex 2507 Spring washers in square (DIN 436), fender (oversized OD), tab / lock-tang (DIN 462 / 463), and spherical seat washer + cup combinations. EN 10204 3.1 / 3.2 material certificates standard; NACE MR0175 / ISO 15156 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 Spring Washers