Grade B8M Bolts Overview
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, PED • GST, IEC & MSME
Clientele
100+ clients • India & export markets
Export Reach
15+ countries • Europe, GCC & APAC
Testing Offered
Mechanical, chemical & NDT • MTC EN 10204 3.1 & 3.2
Shipment Documents
Invoice, Packing List • COO, COI, MTC, BL & Lab Report
Table of Content
Superior Quality A193 B8M Stud Bolt Manufacturer in India With Metric Size Up to M100, Refer Torque Chart
When critical flange joints and vessel closures face severe chloride attack, guesswork is not an option—you need a supplier who tests every heat instead of shipping on promises. Buyers across the Middle East, Africa, and the Americas trust us as their preferred ASTM A193 B8M bolt supplier for absolute connection integrity. Our extensive ex-stock inventory of Class 1 and Class 2 stud bolts, hex bolts, and eye bolts ships directly from Mumbai within 48 hours, eliminating long lead times. Every fastener is backed by full Mill Test Certification (MTC), optional NACE MR0175 / ISO 15156 compliance, and export-ready packaging for long-haul freight. As a direct manufacturer and exporter with zero trader markups, we deliver competitive pricing, faster dispatch, and complete technical verification up to M100 before you commit.
ASTM A193 B8M Bolt Specification
SA 193 Grade B8M Hex Bolts Size Range
- M12 to M100 (metric)
- ¼″ to 4″ (inch series)
- Custom lengths on request
B8M Grade Stainless Steel Hex Bolts Thread & Head
- UNC, 8UN, Metric Coarse (ISO 261)
- Hex, Heavy Hex, Square & Eye Head
A193 GR B8M Flange Bolts Governing Standards
- ASTM A193 / A193M-22
- ASME SA193 / UNS S31600
Grade B8M Stud Bolt Recommended Nuts & Washers
- ASTM A194 Grade 8M Nuts
- ASTM A240 TP316 Washers
ASME SA193 Grade B8M Eye Bolts Finish
- Bright Finish / Black Oxide
- Passivated Per ASTM A967
Alloy Steel ASTM A193 gr B8M J Bolt Testing & Documentation
- Tensile, Hardness, PMI Testing
- MTC, IBR Form 3.1B, TPI on request
SA 193 Grade B8M Hex Bolts Sour Service Compliance
- NACE MR0175 / MR0103
- ISO 15156 qualified
A193 Grade B8M Class 1 Bolts Heat Treatment Class
- Class 1: Carbide Solution Treated
- Class 2: Strain Hardened
Leading ASTM A193 B8M Bolts Manufacturer in Mumbai
Forged and heat-treated in-house, tested before it leaves our facility.
ASTM A193 Grade B8M Square Bolts Torque Chart
Recommended lubricated torque values for ASTM A193 Grade B8M Class 2 (UNC coarse thread) stud bolts:
| Bolt Size | Threads Per Inch | Tensile Stress Area, in² | Target Preload, lbs | Torque, ft-lbs | Torque, Nm |
|---|---|---|---|---|---|
| 1/4″ | 20 | 0.0318 | 2,385 | 10 | 14 |
| 5/16″ | 18 | 0.0524 | 3,930 | 20 | 27 |
| 3/8″ | 16 | 0.0775 | 5,813 | 36 | 49 |
| 7/16″ | 14 | 0.1063 | 7,973 | 58 | 79 |
| 1/2″ | 13 | 0.1419 | 10,643 | 89 | 121 |
| 9/16″ | 12 | 0.1819 | 13,643 | 128 | 174 |
| 5/8″ | 11 | 0.2260 | 16,950 | 177 | 240 |
| 3/4″ | 10 | 0.3345 | 25,088 | 314 | 426 |
How These Values Are Calculated
Before You Apply These Torques
Types of ASTM A193 B8M Bolt
Nine B8M fastener forms, machined in-house by ASTM A193 B8M Bolts suppliers in Mumbai.
SA 193 Grade B8M Hex Bolts
ASME B18.2.1 • ¼″–2″
ASTM A193 Grade B8M Stainless Steel U Bolts
Pipe Clamp & Support
ASME SA193 B8M Stove Bolt
Slotted Head • Small Dia.
A193 Grade B8M Square Bolts
Custom Head Forms
Alloy Steel ASTM A193 gr B8M J Bolt
Foundation Anchoring
A193 Gr 8M Heavy Hex Bolt
ASME B18.2.1 • Heavy Series
Grade B8M Stud Bolt
ASME B18.31.3 • M12–M100
ASME SA193 Grade B8M Eye Bolts
Lifting & AnchoringB8M Grade Stainless Steel Hex Bolts Chemical Composition
Chromium-nickel-molybdenum 316 chemistry per ASTM A193/A193M Table 1, verified against the current edition of the standard.
ASTM A193 B8M Class 2 Mechanical Properties
ASTM A193 B8M Bolts manufacturer in Mumbai: Class 1 stays constant, Class 2 drops with size.
Class 2 (strain hardened) - guaranteed values fall as diameter rises above ¾″:
| Diameter, in. | Tensile, min ksi (MPa) | Yield, min ksi (MPa) | Elongation, min % | Reduction Of Area, min % | Hardness, max |
|---|---|---|---|---|---|
| ¾″ and under | 110 (758) | 95 (655) | 15 | 45 | 321 HBW / 35 HRC |
| Over ¾″ to 1″ | 100 (690) | 80 (552) | 20 | 45 | 321 HBW / 35 HRC |
| Over 1″ to 1¼″ | 95 (655) | 65 (448) | 25 | 45 | 321 HBW / 35 HRC |
| Over 1¼″ to 1½″ | 90 (621) | 50 (345) | 30 | 45 | 321 HBW / 35 HRC |
Alloy Steel ASTM A193 gr B8M J Bolt Equivalent Grades
B8M shares its 316 base chemistry with these international standards—useful when drawings reference non-ASTM specifications.
ASTM / UNS (USA)
- UNS S31600
- ASTM A193 Grade B8M
- Nut: ASTM A194 Grade 8M
DIN / EN (Germany)
- Werkstoff 1.4401
- X5CrNiMo17-12-2
- EN 10269 / EN 10088
JIS (Japan)
- SUS316 / STS316
- JIS G4303 (Bar)
- JIS B1180 (Bolt Form)
BS (United Kingdom)
- 316S31 / 316S16
- Follows EN 10088 (1.4401)
Your ASTM A193 B8M Bolt Partner In Middle East & GCC
We ship B8M stud bolts ex-stock to the Gulf region within 48 hours.
Kuwait City
Manama, Bahrain
Dammam, KSA
Dubai, UAE
Doha, QatarAbu Dhabi, UAE
Muscat, OmanJeddah, KSARenowned ASTM A193 B8M Bolts Exporter In India
Container and LCL shipments, export docs ready for customs.
A193 Grade B8M Class 1 Bolts B8 vs B8M Comparison
ASTM A193 B8M Bolts suppliers in india supply both grades, differing by only one alloying element.
Grade B8 (UNS S30400 / 304)
- Alloying: 18–20% Cr, 8–11% Ni, no Mo
- Pitting Resistance: Moderate
- Best For: Mild atmospheric & freshwater duty
- Relative Cost: Lower
Grade B8M (UNS S31600 / 316)
- Alloying: 16–18% Cr, 10–14% Ni, 2–3% Mo
- Pitting Resistance: Higher, chloride-resistant
- Best For: Marine, chemical & sour service
- Relative Cost: Higher
From Houston To Sao Paulo - B8M Stud Bolts On Demand
We supply B8M bolts to Gulf Coast and Latin American buyers.
Sao Paulo, BrazilHouston, USA
Buenos Aires, Argentina
Monterrey, MexicoChicago, USA
Vancouver, CanadaBaton Rouge, USAB8M Class 1 vs Class 2 Selection Guide
Same chemistry, different heat treatment - pick the class that matches your joint load and diameter.
Class 1 - Solution Treated
- Tensile / Yield: 75 / 30 ksi, all diameters
- Uniformity: Consistent through any bar size
- Typical Use: Large-diameter, low-to-moderate stress joints
Class 2 - Strain Hardened
- Tensile / Yield: 110 / 95 ksi at ¾″ and under
- Size Limit: Guaranteed values drop above 1½″ dia
- Typical Use: High-pressure flange bolting in smaller sizes
ASTM A193 B8M Bolts, Ex-Stock & Ready To Ship Across Africa
We ship container-ready orders across Africa.
Johannesburg, SA
Casablanca, Morocco
Lagos, Nigeria
Nairobi, Kenya
Cairo, Egypt
Dakar, Senegal
Addis Ababa
Algiers, AlgeriaSA 193 Grade B8M Hex Bolts Sour Service & NACE MR0175 Compliance
Molybdenum gives B8M high sulfide stress cracking resistance, making it essential for GCC and West African wellhead and pipeline bolting.
B8M Bolt Service Temperature Range
Austenitic 316 chemistry keeps B8M ductile at cryogenic temperatures while still holding up under sustained heat.
Stays ductile down to cryogenic service
Holds strength under continuous heat
Best kept out of prolonged 425–815°C exposure
Factor this into high-temp bolt-load calcs
Reputed Supplier of ASTM A193 B8M Bolts Across India
Every batch dispatched with matching MTC documentation.
Suppliers of ASTM A193 Grade B8M Heavy Hex Bolt and Eye Bolts for High Temperature Service
Grade B8M Stud Bolt Applications
Industries that specify B8M bolting trust ASTM A193 B8M Bolts exportors in Mumbai.
Bolting for corrosive-media reactors and piping
Wellhead and pipeline flanges in sour environments
Chloride-resistant fastening for saltwater exposure
Withstands high-chloride process water
Hygienic, low-contamination fastening
Corrosion resistance for wash-down environments
Holds up against bleach and acidic process fluids
Reliable clamp load on critical joints
Growing Our ASTM A193 B8M Bolt Reach Into Caucasus & Central Asia
We are expanding supply into Caucasus and Central Asia.
Kazakhstan
Azerbaijan
Uzbekistan
ArmeniaASME SA193 Gr B8M Hex Head Bolt Delivery Timeline
As an ASTM A193 B8M Bolts exporter in india, your B8M bolts ship straight from Mumbai via your chosen mode.
Ex-Stock Dispatch
Ready racks clear our gate in 2–5 working days of PO confirmation
Sea Freight
The economical route for bulk orders, roughly 1–5 weeks by destination
Air Freight
Fastest option for shutdown-critical bolting, typically 3–6 days
Country-Specific ETA
Give us your destination country and we confirm a firm delivery date
Want Heat-Wise Torque Specifications For Your B8M Order?
Share your bolt size, gasket type and flange class - we'll confirm the exact bolt-up torque with your MTC.
Titanium Grade 5 Fasteners FAQs
Quick answers to the questions buyers ask us most before placing an order.
What is the price basis for Titanium Grade 5 Hex Bolts?
- Priced per kg against the day's titanium sponge/scrap rate
- Ti-6Al-4V Grade 5 Fasteners cost more than commercially pure titanium at the same size
- Testing level adds to the final price
- Share your spec for a firm number
- Same pricing basis applies to Titanium Grade 5 Stud Bolts and hex bolts
Can I get the Titanium Grade 5 Heavy Hex Bolt PDF specification?
- Yes, our engineering desk can email it
- Covers chemistry, mechanical values & dimensions
- Size-wise datasheet for your reference
- Includes drawings for Titanium Grade 5 Heavy Hex Bolt sizes
What is the difference between Annealed and STA Titanium Grade 5 Fasteners?
- Annealed: lower & more uniform strength, better ductility
- STA (Solution Treated & Aged) Grade 5 Titanium Bolts are heat treated for higher strength
- STA condition typically limited to smaller diameters
- Always confirm condition before ordering Titanium Grade 5 Fasteners
What is the equivalent grade of Titanium Grade 5 Square Bolts?
- UNS R56400
- DIN / Werkstoff 3.7165
- Ti-6Al-4V (AMS 4928 / ASTM B348)
- AECMA Ti-P64
- Same equivalents apply to Titanium Grade 5 Heavy Hex Bolt forms
What is the chemical composition of Titanium Grade 5 Stud Bolt?
- Aluminium: 5.5–6.75%
- Vanadium: 3.5–4.5%
- Iron: 0.4% max
- Oxygen: 0.2% max
- Same chemistry used in STA Grade 5 Titanium Bolts
- Common to all Titanium Grade 5 Stud Bolts we supply