Super Duplex Stud Bolts Manufacturer, Supplier & Stockiest
Unifit Fastener is a reliable manufacturer, supplier and stockist of the Super Duplex 2507 Stud Bolts, which are produced to be highly resistant in the demanding industrial settings where strength, corrosion and reliability are of paramount importance. These stud bolts are made with high-level super duplex stainless steel, which has very low magnetic permeability and does not become magnetic even in cryogenic temperatures to -135°C. This renders them applicable in the fields that need dimensional stability and magnetic neutrality.
The non-metallic inclusions are kept to a minimum by the refined alloy composition of Super Duplex Stainless Steel 2507 Stud Bolts, which enhances machinability and removes a chance of processing defects or the failure of components prematurely. These stud bolts retain high mechanical effectiveness at high temperatures, and they have high resistance to non-oxidising acids, salts, and alkaline conditions. Thermal processing can result in selective oxidation of some elements like aluminium and copper, and this can result in the formation of a surface layer that is thin, based on nickel, without affecting core functionality.
In Unifit Fastener, the UNS S32750 and UNS S32760 stud bolts are solution annealed to reach the optimal phase balance, which contributes to the toughness, corrosion resistance, and long service. These features make them very appropriate in extreme conditions of operation.
Super Duplex 2507 Stud Bolts have wide application in the oil and gas industry, such as in pump shafts, valves, drill collars, impellers, and instrumentation. They are also favoured in chemical processing plants, electronic components, sensors and oil-well surveying equipment, as they are very strong, highly non-magnetic and corrosion resistant. Unifit Fastener maintains a uniform level of quality and adherence to global standards to guarantee a stable industry performance.
Request QuoteTable of Contents
- What are Super Duplex Stud Bolts
- Grades of Super Duplex Stud Bolts
- Specification of Super Duplex Stud Bolt
- Send Your Enquiry
- Types of Super Duplex Steel UNS S32750 & S32760 Stud Bolt
- Chemical Composition of Super Duplex Steel 2507 Stud Bolts (%)
- Mechanical Properties of Super Duplex Steel 2507 Stud Bolts
- Super Duplex Steel UNS S32750 & S32760 Stud Bolt Equivalent Grades
- Super Duplex Steel 2507 Stud Bolt Size Chart
- ASME B16.5 – Class 300 Stud Bolt Length Chart
- Super Duplex Steel UNS S32750 / S32760 Stud Bolt Dimensions
- Applications & Uses of Super duplex stud bolts
- Nuts Standards – DIN, ISO, BS & IS
- DIN Standards
- FAQs About Super Duplex Stud Bolts
What are Super Duplex Stud Bolts
Super Duplex stud bolts are corrosion-resistant, high-strength fasteners composed of a high chromium, molybdenum, nickel, nitrogen alloy of stainless steel (such as UNS S32750/S32760) that possesses superior mechanical performance, good resistance to pitting/crevice corrosion, and high toughness and are therefore used in very demanding applications in marine, petrochemical, chemical, and oil and gas sectors where standard stainless steels fail.
Grades of Super Duplex Stud Bolts
Specification of Super Duplex Stud Bolt
| Parameter | Specification |
|---|---|
|
Material Grade |
Super Duplex Steel 2507 (UNS S32750 / UNS S32760) |
|
Stud Bolt Size Range |
M02 to M33 (Custom sizes available on request) |
|
Length Range |
3 mm to 200 mm |
|
Thread Types |
UNF, UNC, BSW, BSF, Metric or as specified |
|
Manufacturing Standards |
DIN 525, DIN 835, DIN 938, DIN 939, DIN 940, DIN 949-1, DIN 949-2, DIN 975, DIN 976, DIN 2509, BS 2693, BS 3692, BS 4439, IS 1862, IS 13218, ANSI/ASME B18.31.2, ANSI/ASME B16.5 |
|
Stud Bolt Forms |
Hex, Fully Threaded, Square, Round, Gauge Studs |
|
Thread Configuration |
ASME B1.1 (2A/3A – 2B/3B) Unified Threads, ASME B1.13M (6H/6G) Metric Threads |
|
Popular Stud Bolt Types |
Fully Threaded, Tap End, Double End, Reduced Shank, Flange Studs, Weld Studs |
|
Thread Manufacturing |
Rolled or cut threads (horizontal or vertical machining) |
|
Raw Material Sources |
JSPL, Tata Steel, Mukand Steel, Usha Martin, Dhamman Steel |
|
Production Process |
Cold Forging (M2–M24), Hot Forging (M24–M100), CNC Machining for custom components |
|
Certification |
Dual Certified as per ASTM & ASME |
|
Test Certificate |
EN 10204 / 3.1 Manufacturer Test Certificate |
|
Additional Approvals |
PED 97/23/EC, AD 2000 Merkblatt W2 |
|
Head Drive Options |
Six-Lobe, Phillips, Slotted, Phillips/Slot |
|
Surface Coatings |
PTFE, Teflon, Phosphate, Zinc, Cadmium, Xylan, Hot-Dip Galvanized |
|
Finishing Options |
Self Colour, Passivated, BZP, HDG, Sherardized, DACROMET, Zinc-Nickel, Black Oxide |
|
Packing Options |
Bulk packing, cartons, pallets, small boxes, or as per customer requirement |
Send Your Enquiry
Types of Super Duplex Steel UNS S32750 & S32760 Stud Bolt
Stud Bolts with Reduced Shank
Wheel Lug Stud Bolt
Tie Bar
Reduced Shank Stud
Fully Threaded Stud Bolts
Flange Stud Bolts
Double End Stud Bolt
Weld Studs
Tap End Stud Bolts
Chemical Composition of Super Duplex Steel 2507 Stud Bolts (%)
| Grade | C | N | P | Si | Mn | Cr | Ni | Mo | S | Fe |
|---|---|---|---|---|---|---|---|---|---|---|
| UNS S32750 / S32760 | ≤0.03 | 0.24–0.32 | ≤0.02 | ≤1.00 | ≤1.20 | 24.0–26.0 | 6.0–8.0 | 3.0–5.0 | ≤0.02 | Balance |
Mechanical Properties of Super Duplex Steel 2507 Stud Bolts
| Grade | Tensile Strength (MPa) | Yield Strength (0.2% Proof MPa) | Elongation (% in 50 mm) | Hardness (HR C) |
|---|---|---|---|---|
| UNS S32750 / S32760 | Min 795 | Min 550 | Min 15 | Max 32 |
Super Duplex Steel UNS S32750 & S32760 Stud Bolt Equivalent Grades
| Material Type | Common Name | European DIN / EN | UNS | ASTM / ASME Specification |
|---|---|---|---|---|
| Super Duplex Steel | SAF 2507® | 1.4410 | S32750 / S32760 | ASTM A479 / ASME SA479 / ASTM F53 |
Super Duplex Steel 2507 Stud Bolt Size Chart
| NPS | Flange OD (in) | Bolt Circle Dia (in) | Bolt Hole Dia (in) | No. of Bolts | Bolt Dia (in) | Stud Length – RF (in) | Stud Length – RJ (in) |
|---|---|---|---|---|---|---|---|
| 1/2 | 3 1/2 | 2 3/8 | 5/8 | 4 | 1/2 | 2 1/4 | – |
| 1 | 4 1/4 | 3 1/8 | 5/8 | 4 | 1/2 | 2 1/2 | 3 |
| 2 | 6 | 4 3/4 | 3/4 | 4 | 5/8 | 3 1/4 | 3 3/4 |
| 4 | 9 | 7 1/2 | 3/4 | 8 | 5/8 | 3 1/2 | 4 |
| 6 | 11 | 9 1/2 | 7/8 | 8 | 3/4 | 4 | 4 1/2 |
| 10 | 16 | 14 3/4 | 1 | 12 | 7/8 | 4 1/2 | 5 |
| 20 | 27 1/2 | 25 | 1 1/4 | 20 | 1 1/8 | 6 1/4 | 6 3/4 |
| 24 | 32 | 29 1/2 | 1 1/4 | 20 | 1 1/4 | 6 3/4 | 7 1/4 |
ASME B16.5 – Class 300 Stud Bolt Length Chart
| NPS | Flange OD (in) | Bolt Circle (in) | Bolt Dia (in) | No. of Bolts | Stud Length RF (in) | Stud Length RJ (in) |
|---|---|---|---|---|---|---|
| 1/2 | 3 3/4 | 2 5/8 | 1/2 | 4 | 2 1/2 | 3 |
| 2 | 6 1/2 | 5 | 5/8 | 8 | 3 1/2 | 4 |
| 4 | 10 | 7 7/8 | 3/4 | 8 | 4 1/2 | 5 |
| 6 | 12 1/2 | 10 5/8 | 3/4 | 12 | 4 3/4 | 5 1/2 |
| 10 | 17 1/2 | 15 1/4 | 1 | 16 | 6 1/4 | 6 3/4 |
| 16 | 25 1/2 | 22 1/2 | 1 1/4 | 20 | 7 1/2 | 8 |
| 24 | 36 | 32 | 1 1/2 | 24 | 9 | 10 |
Super Duplex Steel UNS S32750 / S32760 Stud Bolt Dimensions
| Metric Size | Dia (mm) | Dia (inch) | Nut Size (mm) |
|---|---|---|---|
| M12 | 12 | 0.472 | 19 |
| M20 | 20 | 0.787 | 30 |
| M24 | 24 | 0.945 | 36 |
| M30 | 30 | 1.181 | 46 |
| M36 | 36 | 1.417 | 55 |
| M48 | 48 | 1.890 | 75 |
| M56 | 56 | 2.205 | 85 |
| M64 | 64 | 2.520 | 95 |
| M80 | 80 | 3.150 | 115 |
| M100 | 100 | 3.937 | 145 |
| M160 | 160 | 6.299 | 230 |
Why Choose Unifit Fastener Super Duplex 2507 Stud Bolts?
Unifit Fastener manufactures Super Duplex Steel 2507 Stud Bolts with strict quality control, ensuring superior mechanical strength, excellent corrosion resistance, and compliance with international standards. These stud bolts are widely used in oil & gas, offshore platforms, chemical processing, heat exchangers, pressure vessels, and marine applications.Stud Bolt Manufacturing Expertise
Unifit Fastener manufactures and supplies stud bolts in both inch and metric series, strictly adhering to international standards such as ANSI, ASME, DIN, BS, and IS. Our stud bolts are widely used in flange connections, pressure vessels, pipelines, structural assemblies, and heavy engineering applications, ensuring precise fitment, consistent performance, and long service life.
Super Duplex Stud Bolts Price
The Super Duplex Steel stud bolts price varies by grade (S32750/S32760), size, thread type, coating, and quantity. Unifit Fastener offers competitive pricing without compromising quality or certification.
Our stud bolts are engineered for high strength, excellent corrosion resistance, and long-term reliability in critical applications.
Contact us with your specifications for a custom quote and bulk order discounts on high-performance Super Duplex 2507 stud bolts.
Applications & Uses of Super Duplex Stud Bolts
- Oil & Gas Industry : Offshore platforms, pipelines, pump shafts, valves, drill collars, and pressure vessels.
- Chemical & Petrochemical Plants : Reactors, heat exchangers, chemical processing equipment, and chlorinated solvent systems.
- Marine & Offshore Equipment : Seawater-cooled systems, shipbuilding, desalination plants, and submersible pumps.
- Power Generation : Boilers, turbines, condensers, and cooling systems.
- Food & Pharmaceutical Industries : Equipment requiring corrosion-resistant, sanitary-grade fasteners.
- Heavy Engineering & Construction : Flanges, structural connections, and industrial machinery in harsh environments.
- Electronic & Instrumentation Components : Sensors, precision assemblies, and instruments exposed to corrosive or high-temperature conditions.
FAQs About Super Duplex Stud Bolts
Q1: What is Super Duplex Steel 2507?
Super Duplex Steel 2507 is a high-strength, corrosion-resistant alloy (UNS S32750 / S32760) with excellent resistance to pitting, crevice corrosion, and stress corrosion cracking, making it ideal for demanding industrial applications.
Q2: What are the common applications of 2507 stud bolts?
2507 stud bolts are widely used in oil & gas, chemical processing, marine systems, power generation, desalination plants, heavy engineering, and precision instrumentation.
Q3: What sizes and thread types are available?
Unifit Fastener offers a wide range of sizes from M2 to M160, with thread types including Metric, UNC, UNF, BSW, BSF, and custom specifications available on request.
Q4: Can I order bulk or custom sizes?
Yes. Unifit Fastener manufactures custom lengths, diameters, and thread forms as per project requirements, including large-scale bulk orders with competitive pricing.