Stainless Steel 321 Fasteners Quick Highlights
Mortec At A Glance
Established
Since 2012 • 15+ yrs experience
Manufacturing Units
2 in-house units • Taloja & Mazgaon
Stockyard Area
8,850+ sq.ft • Ready-stock inventory
Certifications
ISO 9001:2015 • GST, IEC & MSME
Clientele
100+ clients • India & export markets
Export Reach
15+ countries • Africa, GCC & Americas
Testing Offered
Mechanical, chemical & intergranular • MTC EN 10204 3.1 & 3.2
Shipment Documents
Invoice, Packing List • COO, COI, MTC, BL & Lab Report
Table of Content
Superior Stress-Rupture SS 321 Bolts and Nuts Manufacturer in India Withstand Up To 900°c
Repeated boiler heat cycles through carbide ranges can cracks ordinary bolting. This can cause cracking along weld lines, making unsuitable. Buyers across South Africa, Gulf and Canada choose Stainless Steel 321 Bolts. Titanium stabilisation keeps grain boundaries clean after welding and heating. Our ex-stock hex bolts, studs, nuts and washers ship quickly. Most orders ship within days rather than several weeks after confirmation. Every SS 321 fastener leaves our works with full certification. Intergranular corrosion testing is available upon request for demanding applications.
As a dedicated Stainless Steel 321 fasteners exporter, we deal directly. No trader layers mean better pricing and faster technical answers. Whether ordering sample stud or container-load bolts, our grade desk verifies. Thread, condition and testing level are confirmed before you commit. So you order confidently, without guesswork, delays, or inspection surprises.
Stainless Steel 321 Fasteners Specification
Share your fastener requirements and receive a prompt ex-Mumbai quote with MTCs.
SS 321 Hex Nuts/ Bolts Head & Drive Styles
- Hex head, socket head, button head
- Countersunk & continuous-thread rod
WNR 1.4541 Bolts Surface Finish
- Bright, passivated, self-colour
- Electropolished finish on request
SS 321 Nuts Testing & Documentation
- PMI, proof load, tensile & hardness
- MTC, third-party inspection on request
SS 321 Screws Sensitization Resistance
- Resists carbide precipitation 425–870°C
- ASTM A262 practice available on request
UNS S32100 Fastener Manufacturing Origin
- Hot forged, cold headed or CNC machined
- Indian & European mill sourced bar
SS 321 Bolts Export Packing
- Seaworthy crating & VCI wrapping
- FOB, CFR, CIF or DAP terms available
Stainless Steel 321 bolts Size Range
- 1/4" to 2" and M6 to M52 diameters
- Custom lengths cut as per drawing
SS 321 Stud Bolts Standards & Threads
- ASTM A193 Gr B8T / A194 Gr 8T
- ASME B18.2.1, DIN 931 / 933, ISO 4014 / 4017
SS 321 Washers Chemistry & Grade
- 17-19% Cr, 9-12% Ni, Ti stabilised (5xC min)
- ASTM A276 / A479 bar, 321H available
Stainless Steel 321 Bolts Dimensions
ASTM A193 Grade B8T (UNS S32100) hex bolts to ASME B18.2.1 & B1.1 UNC standards. custom lengths available.
| NOMINAL SIZE (D) | HEAD THICKNEASTM A193 | BODY DIAMETER | ACROASTM A193 THE FLATS | ACROASTM A193 CORNERS | ||||
|---|---|---|---|---|---|---|---|---|
| H (MAX) | H (MIN) | D (MAX) | D (MIN) | F (MAX) | F (MIN) | C (MAX) | C (MIN) | |
| M10 | 6.63 | 6.17 | 10.00 | 9.78 | 17.00 | 15.73 | 18.48 | 17.77 |
| M12 | 7.76 | 4.24 | 12.00 | 11.73 | 19.00 | 17.73 | 20.78 | 20.03 |
| M14 | 9.09 | 8.51 | 14.00 | 13.73 | 22.00 | 20.67 | 24.25 | 23.35 |
| M16 | 10.32 | 9.68 | 16.00 | 15.73 | 24.00 | 23.67 | 27.71 | 26.75 |
| M20 | 12.88 | 12.12 | 20.00 | 19.67 | 30.00 | 29.16 | 34.64 | 32.95 |
| M24 | 15.44 | 14.56 | 24.00 | 23.67 | 36.00 | 35.00 | 41.57 | 39.55 |
| M30 | 19.48 | 17.92 | 30.00 | 29.67 | 46.00 | 45.00 | 53.12 | 50.85 |
| M36 | 23.38 | 21.63 | 36.00 | 35.61 | 55.00 | 53.80 | 63.51 | 60.79 |
| M42 | 26.97 | 25.03 | 42.00 | 41.38 | 65.00 | 62.90 | 75.06 | 71.71 |
| M48 | 31.07 | 28.93 | 48.00 | 47.38 | 75.00 | 72.60 | 86.60 | 82.76 |
| M56 | 36.2 | 33.80 | 56.00 | 55.26 | 85.00 | 82.20 | 98.15 | - |
Offer Tensile & Creep-Tested UNS S32100 Screws and Studs Ex.Stock For Boilers & Exhausts
SS 321 Fastener Testing & Certification
Every check is completed before dispatch and confirmed on the pre-shipment checklist.
UNS S32100 Fastener Applications
We are the preferred Stainless Steel 321 Fasteners Manufacturer in India, delivering unmatched quality with fast delivery.
Stainless Steel 321 Fasteners Manufacturer in Mumbai
Share your drawing and we confirm size, class and stock availability the same day.
Stainless Steel 321 Fasteners Types
We are a leading Stainless Steel 321 Fasteners Supplier in India, keep reacy stock across bolts, studs, nuts and washers.
SS 321 Hex Bolt
ASME B18.2.1 • 1/4″–2″- Wrench-fit head for flange joints
- Most-ordered form, held ex-stock
ASTM A193 B8T Stud Bolt
Continuous & Double-End • Custom Length- Cut and threaded to your drawing
- Preferred for boiler flange bolting sets
SS 321 Socket Head Cap Screw
ISO 4762 / ASME B18.3- Allen-key drive for confined spaces
- Available cup, cone & dog point set screws
WNR 1.4541 Heavy Hex Nut
ASME B18.2.2 • 1/4″–2″- Matched thread class to your bolt lot
- Standard or jam profile in stock
SS 321 Hex Jam Nut
ASME B18.2.2 • Low-Profile- Locking second nut for vibration duty
- Common on exhaust hanger assemblies
SS 321 Flat Washer
ASME B18.21.1- Spring-load Belleville for thermal cycling
- Wide fender pattern for soft substrates
SS 321 U-Bolt
Pipe Clamp & Support Duty- Bent and threaded to your pipe OD
- Used on exhaust and duct hangers
UNS S32100 Threaded Rod
Full Thread • Custom Cut Length- Cut to length with die-cut or rolled thread
- Common in structural hanger rod duty
SS 321 Solid Rivet
Furnace & Ducting Grade- Cold-headed for consistent shear strength
- Custom diameter and grip length
SS 321 Fastener Chemical Composition
AISI 321 Threaded Rod Mechanical Properties
Stainless Steel 321 Fasteners Equivalent
SS 321 Fasteners has regional equivalents, all sharing the same titanium-stabilised Cr-Ni chemistry.
ASTM / AMS (USA)
- UNS S32100
- ASTM A193 Grade B8T (Bolts & Studs)
- ASTM A194 Grade 8T (Nuts)
- AMS 5510 & AMS 5645
DIN / EN (Germany)
- Werkstoff 1.4541
- EN X6CrNiTi18-10
- EN 10269
JIS (Japan)
- SUS 321
BS (United Kingdom)
- BS 321S31
- Follows EN 10269 (1.4541)
SS (Sweden)
- SS 2337
GB/T (China)
- 06Cr18Ni11Ti
SS 321 Bolts Exporter In India To Durban, South Africa
Full container and LCL pricing landed at your port within two working days.
SS 321H Bolts High-Temperature & Sensitization Resistance
Titanium stabilisation is what separates 321 from a plain 304 bolt once your joint sees repeated heat cycles.
UNS S32100 Screws Weldability & Post-Weld Corrosion Resistance
A frequent question from our boiler and exhaust-system buyers before they specify weld studs or hanger rod in this grade.
Need Mill Test Certificates With Your SS 321 Order?
Each bolt lot is issued with full chemical and mechanical test records, upgradeable to 3.2 witnessed on request.
SS 321 vs SS 316 Fasteners – Which To Choose ?
The right answer depends on whether your joint fights heat or chlorides - here is how the two grades split.
SS 321 (UNS S32100)
- Stabiliser: Titanium, no molybdenum
- Best For: Welded joints in the 425–900°C range
- Typical Use: Boilers, exhausts, furnace bolting
SS 316 (UNS S31600)
- Stabiliser: None, 2–3% molybdenum added
- Best For: Chloride, marine and pitting-prone service
- Typical Use: Coastal structures, marine hardware
INOX 321 Nuts Torque & Proof Load Reference
Torque is not a fixed number for a given size - it depends on thread diameter, pitch, class and friction (lubricated vs dry).
Start From Proof Load
Target preload is usually 65–75% of the bolt's proof load, itself derived from yield strength and stress area.
Apply The Torque Formula
T = K × D × F, where K is the friction (nut factor), D is nominal diameter and F is target clamp load.
Watch Galling Risk
Austenitic stainless threads gall easily - a nickel-based anti-seize is recommended on every SS 321 assembly.
Verify By Test
For critical boiler joints we recommend a calibrated torque-tension test on a sample lot before production tightening.
Send your thread size, pitch, & class and we'll return a size-specific torque figure - Request Your Torque Chart.
ASTM A193 B8T Supplier In Bengaluru, EN 10204 3.1/3.2 Compliant
Boiler-grade lots dispatched with full heat traceability to your Bengaluru site.
Stainless Steel 321 Fasteners Delivery Estimate
Once your PO is confirmed, SS 321 fastener lots are packed and shipped - pick the mode that fits your schedule.
Ex-Stock Hex Bolts & Nuts
Standard sizes leave our facility within 2 working days
Sea Freight / FCL & LCL
Best value for bulk boiler bolting orders, 12–28 days port to port
Air Freight Priority
For urgent shutdown or turnaround needs, 3–5 days door to door
Destination-Wise ETA
Share your delivery port or city and receive a confirmed ship date
SS 321 Fasteners FAQs
Quick answers to the questions buyers ask us most before placing an order.
What is 321 Stainless Steel used for in Hex Bolts and Studs?
SS 321 hex bolts serve 425-900°C duty on boilers, exhausts, furnace parts and heat exchangers.
Which is better for Stud Bolts, SS316 or SS 321?
SS 316 suits chloride service; SS 321 stud bolts win above 425°C on sensitization resistance.
What is the equivalent grade for Stainless Steel 321 Fasteners?
UNS S32100 matches DIN 1.4541, JIS SUS321 and BS 321S31.
Do you supply SS 321 Fasteners, Nuts and Washers to South Africa, UAE and Kenya?
Yes - SS 321 nuts and washers ship to Durban, Jebel Ali and Mombasa with full export documents.
What sizes are available in SS 321 Threaded Rods and Screws?
SS 321 threaded rods run 1/4" to 2" and M6 to M52, cut to any length as per drawing.
Which ASTM standard applies to SS 321 Bolts and 321H Fasteners?
ASTM A193 Gr B8T bolts with A194 Gr 8T nuts; 321H adds carbon for creep strength.
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