Oshwin Overseas manufactures and supplies Super Duplex 2507 Bolts from Mumbai, India. As a trusted Super Duplex S32750 Bolts Supplier to Oman, South Korea, the UAE and Saudi Arabia, the company has served Gulf and Asian process-plant markets since 1999.
Oshwin is ISO 9001:2015 certified with in-house forging and finishing. Stock includes SDSS 2507 hex bolts, anchor bolt sets, connection bolt sets, eye bolts and threaded rod to ASTM A479 UNS S32750. Every batch ships with mill test certificates.
PREN ≥ 40 Certified
Every heat's Cr-Mo-N analysis printed on its own EN 10204 3.1 certificate.
M6-M12 In Stock
Priority dispatch for Gulf turnaround and connection-bolting deadlines.
(Min, Annealed)
- Grade
- UNS S32750
- Standard
- ASTM A479 / F468 / F2281
- Size Range
- M6-M12 ex-stock
- PREN
- ≥ 40
- MTC
- EN 10204 3.1
- Lead Time
- 2-5 Days
Super Duplex 2507 Stud Bolts & Nuts Manufacturer in India, Supplied for Flange Bolting
UNS S32750 Hex Bolts & Threaded Rod Machined From M6 to M12 Diameters to ASTM A479
Table of Contents
- Super Duplex 2507 Bolts Specification - Cold-Headed & Hot-Forged Range
- Every UNS S32750 Fastener Type We Stock
- ASTM A479 UNS S32750 Chemical Composition
- Super Duplex S32750 Bolts Mechanical Properties & Yield Strength
- Super Duplex 2507 vs Duplex 2205 Bolts - PREN & Strength
- UNS S32750 Bolts Equivalent Grades
- Super Duplex S32750 Bolts Metric Sizes - In Stock
- UNS S32750 Anchor Bolt & Connection Bolt Sets with DIN 9021 Washers
- DIN 580 Super Duplex S32750 Eye Bolts
- UNS S32750 Hex Flange Head Bolts for Flange Bolting
- Super Duplex 2507 Bolt & Nut Torque Chart
- Alloy 2507 Bolts Thread Pitch Chart & Nut Compatibility
- UNS S32750 Bolts Head Marking Example
- Super Duplex 2507 Bolts Corrosion Resistance in Chloride & Sour Service
- Common Super Duplex 2507 Bolt, Nut & Washer Enquiries We Handle
- Applications of Super Duplex 2507 Bolts
Super Duplex 2507 Bolts Specification
Oshwin Overseas runs both cold-headed and hot-forged production lines for Super Duplex 2507 Bolts from our Kalamboli, Navi Mumbai factory. Smaller diameters up to M12 are cold formed for tighter thread tolerance. Anchor bolt sets, connection bolt sets and larger custom sizes go through hot forging before solution annealing.
Machined from Bar
M6-M12, turned to size post-anneal
Super Duplex 2507 Hot Forged
Anchor bolts, stud bolts & sizes above M12, re-annealed after forging
Certification
EN 10204 3.1 Material Test Certificate
Compliance
NACE MR0175, PREN ≥40 verified on request
Service Range
Cryogenic to 570°F (300°C)
Hex Bolt Dimensions
ASME B18.2.1 - head, WAF & thread length
Thread Tolerance
Coarse (UNC), Fine (UNF) & Metric ISO threads
Anchor & Connection Sets
Bolt + nut + washer(s), DIN 9021 washer option
Sizes Buyers Order Most
Same-Day Quote - share your bolt type, size and standard, get an ex-Mumbai price within 24 hours.
Every UNS S32750 Fastener Type We Stock
Product photography for this grade is still being shot at our Mumbai facility. Every type below is stocked and ready to quote. Socket head cap screws and other head styles are cut to drawing on request.
ASTM A479 UNS S32750 Chemical Composition
This is the ASTM A479 ferritic-austenitic range (Cr-Ni-Mo-N chemistry). The higher Cr, Mo and N content over Duplex 2205 is what pushes PREN above 40. Each production heat's exact analysis is printed on its own EN 10204 3.1 certificate.
Super Duplex S32750 Bolts Mechanical Properties & Yield Strength
Values shown are solution-annealed condition minimums per ASTM A479. Super Duplex 2507 does not cold-head like austenitic grades — intermediate annealing applies on larger sizes.
Super Duplex 2507 Bolts Supplier in India with NACE MR0175 Compliance
PREN ≥ 40 stock, ready for immediate dispatch to the Gulf and beyond.
Get Supplier QuoteSuper Duplex 2507 Bolts vs Duplex 2205 Bolts - PREN & Strength
UNS S32750 Bolts Equivalent Grades
Buyers sometimes ask for ASTM F593 UNS S32750. F593's standard alloy groups don't include super duplex stainless steel 2507 — ASTM F468 and ASTM F2281 are the correct bolting standards. Some listings also mix up UNS S32750 with UNS S32760 (Zeron 100), a different super duplex grade with slightly different chemistry. Confirm the exact UNS number on your drawing before ordering.
Super Duplex S32750 Bolts Metric Sizes - In Stock
Super Duplex S32750 Bolts metric sizes M6 to M12 stay ready for immediate delivery at our Navi Mumbai stockyard. In-house custom cutting is available for lengths and diameters outside the standard range, including anchor bolt sets up to M12x200mm and eye bolts up to M30.
Lengths cut and threaded to drawing. Anchor bolt sets to M12x200mm, connection bolt sets and DIN 580 eye bolts to M30 confirmed on request.
UNS S32750 Anchor Bolt & Connection Bolt Sets with DIN 9021 Washers
Two of our most common Super Duplex 2507 orders are anchor bolt sets and connection bolt sets, both built exactly to the buyer's bolted-joint drawing. Anchor sets pair one bolt, one washer and one nut. Connection sets pair one hex bolt and one nut with two DIN 9021 washers, matched to a recent Oman project.
| Set Type | Size | Configuration |
|---|---|---|
| Anchor Bolt Set | M12 x 200mm | 1 Bolt + 1 Washer + 1 Nut |
| Anchor Bolt Set | M12 x 110mm | 1 Bolt + 1 Washer + 1 Nut |
| Connection Bolt Set | M12 x 120mm | 1 Hex Bolt + 1 Nut + 2 Washers (DIN 9021) |
| Connection Bolt Set | M8 x 160mm | 1 Hex Bolt + 1 Nut + 2 Washers (DIN 9021) |
| Connection Bolt Set | M12 x 85mm | 1 Hex Bolt + 1 Nut + 2 Washers (DIN 9021) |
| Connection Bolt Set | M8 x 115mm | 1 Hex Bolt + 1 Nut + 2 Washers (DIN 9021) |
| Connection Bolt Set | M6 x 35mm | 1 Hex Bolt + 1 Nut + 2 Washers (DIN 9021) |
Every set ships from the same solution-annealed heat, so the bolt, nut and washer carry one EN 10204 3.1 certificate. Anchor fastener sets (bolt + nut + washer) to M10x100mm have also gone out for Saudi Arabia project work in similar batch sizes.
DIN 580 Super Duplex S32750 Eye Bolts
Super Duplex 2507 Eye Bolts to DIN 580 come in a plain finish with a forged ring-and-shank profile, machined for lifting and rigging duty in corrosive environments. A recent South Korea order covered M16 (2.0mm pitch) and M30 (3.5mm pitch) sizes in small quantities.
UNS S32750 Hex Flange Head Bolts for Flange Bolting
Hex flange head bolts carry an integrated flange under the head, spreading clamp load without a separate washer. We supplied UNS S32750 hex flange head bolts at M12x100mm length to a Dubai, UAE buyer for flange-bolting duty.
Super Duplex 2507 Bolt & Nut Torque Chart
Bolt torque follows the formula T = K × F × d. F is the target clamp load, d is the nominal diameter and K is a friction coefficient set by the lubricant. This holds for Super Duplex 2507 the same way it does for steel bolting, once you allow for the higher yield strength.
Galling Risk
Stainless-on-stainless threads seize dry - always lubricate before assembly
Anti-Seize
Use a nickel- or copper-based anti-seize rated for duplex threads
Nut Match
Pair with same-alloy UNS S32750 nuts to avoid a galvanic mismatch
Buyer-Specified Torque
We confirm your exact clamp-load target - never a generic published figure
Alloy 2507 Bolts Thread Pitch Chart & Nut Compatibility
Alloy 2507 Bolts thread pitch follows standard ISO metric coarse pitch. The same dies used on steel cut these threads into S32750 bar stock; DIN 580 eye bolts follow their own DIN pitch schedule.
| Nominal Size | M6 | M8 | M10 | M12 | M16 | M30 |
|---|---|---|---|---|---|---|
| ISO Coarse Pitch (mm) | 1.00 | 1.25 | 1.50 | 1.75 | 2.00 | 3.50 |
Nut Compatibility: Super Duplex 2507 Bolts pair best with same-alloy UNS S32750 hex or heavy hex nuts to ASTM F468. This gives a like-for-like strength and corrosion match. A lower-alloy stainless nut creates a galvanic mismatch and caps joint strength to the weaker nut. We supplied matching Super Duplex 2507 hex nuts on the Oman connection-bolt order.
UNS S32750 Bolts Head Marking Example
- Manufacturer's trademark or ID symbol on the head
- Material stamp "2507" or "F53" identifying the alloy
- Heat or lot number, traceable to the EN 10204 3.1 certificate
- Grade symbol matched to the buyer's drawing when space allows
Duplex grades skip the plain SAE/ASTM grade-line marks used on carbon-steel bolts. Instead we trace each bolt by its material stamp and heat number.
Super Duplex 2507 Bolts Corrosion Resistance in Chloride & Sour Service
PREN (Pitting Resistance Equivalent Number) is calculated as %Cr + 3.3×%Mo + 16×%N. Super Duplex 2507's chemistry pushes this above 40, roughly 20% ahead of Duplex 2205 and well ahead of 316 stainless.
Common Super Duplex 2507 Bolt, Nut & Washer Enquiries We Handle
Here are recent requirements we've handled for Super Duplex 2507 Bolts, Nuts and Washers.
Urgent Super Duplex material requirement - Oman buyer requesting best offer and delivery schedule on UNS S32750 anchor and connection bolt sets.
Anchor bolt sets to UNS S32750 - M12x200mm and M12x110mm, bolt + washer + nut, 872 sets total for an Oman project.
Connection bolt sets with DIN 9021 washers - six sizes from M6 to M12, hex bolt + nut + 2 washers, 2,890 sets for Oman.
DIN 580 eye bolts, plain finish - M16/2.0P and M30/3.5P, small quantity for a South Korea buyer.
UNS S32750 hex flange head bolts - M12x100mm length, 40 pieces, for a Dubai, UAE buyer.
Anchor fastener sets for Saudi Arabia - M10x100mm, bolt + nut + washer, 200 sets for a Dammam project.
Super Duplex S32750 stud bolts & nuts - matched to ASTM F468/F2281 for Gulf flange-bolting orders.
PREN verification requests - buyers confirming Cr-Mo-N chemistry meets PREN ≥40 before order confirmation.
Applications of Super Duplex 2507 Bolts
Offshore Oil & Gas Platform Bolting
Desalination & Seawater Piping
Chemical Processing & Sour-Service Equipment
Structural Anchor & Connection Bolting
Marine Engineering & Rigging Hardware
Anchor Bolt & Connection Bolt Sets to UNS S32750 - Oman & Gulf Bolted-Joint Orders Shipped Ex-Stock
PREN ≥ 40 stock, matched sets, ready for immediate dispatch.
Check Ex-Stock AvailabilityUNS S32750 Bolts Value-Added Services
A bolt ex-stock rarely arrives exactly as a buyer's drawing needs it. Our Mumbai workshop handles the finishing work in-house instead of outsourcing it.
Threading
Drilling
Tapping
Turning
Chamfering
Pipe Threading
Solution Annealing
Bending
PREN Verification
Oshwin Overseas Manufacturing Capability
Oshwin's skilled production line handles material drawing, solution annealing, forging and tapping within our own factory. As a Super Duplex 2507 bolts manufacturer, this in-house control helps us hold tight thread tolerance and consistent PREN across large anchor-bolt and connection-bolt orders.
Super Duplex 2507 Bolts & Nuts Classification
Super Duplex 2507 Nut Bolt Thread Types
Super Duplex 2507 Bolts Surface & Coating
Zinc plating and hot-dip galvanizing don't work on duplex stainless steel. Those coatings are made for carbon steel, so we don't offer them on Super Duplex 2507 fasteners.
UNS S32750 Fasteners Standards Compliance
SGS, BV, TUV and Lloyd's inspectors are all welcome on our floor. Every batch stays fully traceable to the standards it was ordered against.
Testing, Documentation & Third-Party Inspection
Our Export Network
Gulf buyers drive steady Super Duplex 2507 volume — Oman, UAE and Saudi Arabia order regularly for anchor and connection bolt sets. South Korea and other Asian buyers also come to us for DIN 580 eye bolts and precision small-batch orders.
Middle East
Oman
UAE
Saudi Arabia
Qatar
Kuwait
Southeast & South Asia
South Korea
Singapore
Malaysia
Thailand
Europe
United Kingdom
Netherlands
Germany
Americas
USA
Brazil
Recent Super Duplex 2507 Bolt Enquiries
Mumbai
Oman
Product: UNS S32750 Anchor Bolt, Washer & Nut Sets
Size: M12x200mm (240) & M12x110mm (632)
Mumbai
Oman
Product: Hex Bolt + Nut + 2 DIN 9021 Washers
Size: M12x120mm, M8x160mm, M12x85mm, M8x115mm, M8x35mm, M6x35mm
Mumbai
South Korea
Product: DIN 580 Eye Bolt, Plain Finish
Size: M16/2.0P (2pcs), M30/3.5P (4pcs)
Mumbai
Dubai, UAE
Product: Hex Flange Head Bolts, UNS S32750
Size: M12x100mm, 40 pieces
Mumbai
Dammam, Saudi Arabia
Product: Anchor Fasteners, Bolt + Nut + Washer
Size: M10x100mm, 200 sets
Delivery Estimate From Ready Stock
Ships from Mumbai
Stock orders leave our facility in 2-5 working days
Sea Freight
Best economy option, 10-25 days depending on port
Air Freight
3-6 days when a project deadline can't wait
Get a Firm Date
Tell us your discharge port and we'll confirm the ETA
Oman8-14 daysUAE8-14 daysSaudi Arabia10-16 daysSouth Korea14-22 daysSea freight, port-to-port. Need it faster? Air freight brings any of these down to 3-6 days.
FAQs - Super Duplex 2507 Bolts
Bar stock follows ASTM A479 UNS S32750. Forgings use ASTM A182 grade F53. Bolting itself is covered by ASTM F468 and ASTM F2281, with dimensions to ASME B18.2.1.
PREN measures resistance to pitting corrosion. It is based on a metal's chromium molybdenum and nitrogen content. Super Duplex 2507 fasteners score above 40 PREN. That is about 20% higher than Duplex 2205. This is why they hold up better in high chloride sour service and seawater conditions.
2507 has more chromium, molybdenum and nitrogen than 2205. This makes it stronger, raising yield strength from 65 ksi to 80 ksi minimum. It also raises PREN from about 35 to above 40. Pick 2507 fasteners for high chloride or sour service jobs. Pick 2205 for most standard duplex jobs, at a lower cost.
Solution annealed UNS S32750 gives 80 ksi or 550 MPa minimum yield strength. Tensile strength is 116 ksi or 800 MPa minimum, per ASTM A479. Elongation is 15% minimum.
Yes. Like other stainless bolts, 2507 threads can seize under dry torque. Use a calibrated wrench with a nickel or copper anti seize. Confirm your exact torque target.
M6 to M12 stays ex-stock at our Mumbai facility. Larger sizes up to M30, anchor bolt sets, connection bolt sets and DIN 580 eye bolts are made to drawing based on real project orders we've handled.
Price depends on size, set configuration (bolt/nut/washer count) and quantity. Share your size, standard and quantity through a price list request and we'll confirm an ex-Mumbai quote within 24 hours.
Yes. We regularly supply UNS S32750 anchor bolt sets and connection bolt sets with DIN 9021 washers, matching recent Oman project orders from M6 to M12 diameter.