M3 to M150
Wide Metric Size Range
UNS S31600
Certified Molybdenum Grade
20+ Countries
Trusted Global Exporter
EN 10204/3.1B
Mill Test Certification
-198°C to 800°C
Wide Service Temperature
Class 1 & 2
Both Heat Treatments Stocked
ASME & DIN
Standards Compliant Bolting
Direct Factory Price
No Middleman Markup

ASTM A193 B8M Bolts Snapshot
Table of Content
- ASTM A193 B8M Bolt Specification
- ASTM A193 Gr B8M Fasteners Size Chart
- Price List of SA 193 Gr B8M Stud Bolt
- Difference Between ASTM A193 B8M vs ASTM A193 B8 Bolts
- Which Thread Type Do You Need in SA 193 B8M Threaded Rod?
- ASTM A193 B8M Bolt Torque Chart
- Types of B8M Grade Stainless Steel Fasteners
- ASTM A193 B8M Bolts Standards
- A193 Grade B8M Heavy Hex Bolt Dimension
- ASTM A193 B8M Class 2 Hex Bolt Applications
- What Else Do You Need With ASTM A193 B8M Bolts?
- A193 B8M Class 2 Stud Bolts Weight Chart
- Heat Treatment of A193 B8M Class 1 vs Class 2 Studs
- Advantages of Using ASTM A193 B8M class 2 Screws
- ASME SA193 Gr B8M Heavy Hex Bolts Chemical Composition
- ASTM A193 B8M Bolts Equivalent Grades
- SA 193 Gr B8M Threaded Rod Manufacturing & Testing Process
- ASTM A193 B8M Stud Bolt Mechanical Properties
- Which ASTM A193 B8M U Bolts Should You Order For Your Load?
- Recommended Nut and Washer for ASTM A193 B8M Bolts
CE Approved ASME SA193 Gr B8M Class 1 and 2 Studs Bolt Manufacturer in India With MTC EN 10204 3.1
Vision Alloys exports fasteners to Saudi Arabia and Germany. We are a leading stockist, supplier and manufacturer in India. lobal buyers trust our export quality and delivery timelines. Singapore, Qatar, Brazil and Senegal receive regular shipments too. Fasteners available in stainless steel, nickel alloys and duplex. Vision Alloys maintains full ISO certified quality systems. Bolts, stud bolts, nuts and washers all supplied together.
We supply ASTM A193 B8M Bolts across 25+ countries worldwide. Our bolts are PED approved and CE certified products. Stock includes A193 B8M Class 1 Stud Bolts in bulk. Chemical industries rely on B8M bolts for corrosion resistance. Water treatment facilities use B8M for long service life.

ASTM A193 B8M Class 2 Flange Bolts
- Serrated Washer Face
- Sizes M10 to M110
- ASME B16.5 Flange Joints

A193 Gr B8M Countersunk Bolts
- Flush Mounted Head
- Slotted & Phillips Drive
- Smooth Surface Finish Fit

ASME SA 193 Gr B8M Heavy Hex Bolts
- ASME B18.2.2 Wide Head
- Class 1 & Class 2 Available
- High Torque Flange Duty
- 3/4″ to 1-1/2″
- Size: M02 to M160
- 321HBW
- Fine
- Coarse
- Cold Forging
- CNC Machined
- Hot Forging
- A
- D
- C
- G
- B
- E
- 1371-1399°C
- ASME SA 193
- ASTM A193
- Canton
- Wooden Pallet
- Carton
- Plain, Electric galvanized
- Phosphating, Zinc impregnation
- Oxidation, DACROMET
- CNC Lath
- Thread Rolling
- Making Machines
- 100% Tested ASTM A193 B8M Bolts with MTC EN 10204 3.1/3.2

- UNC
- UN8
- BSW
- UTS
- ACME
- UNF
- UNR
- UNM
- BSF
- hex bolt
- bolt
- nuts
- threaded rod
- screws
- washers
- stud bolt
- Bagging
- Head Shank Drilling
- Thread Locking
- Head Painting
- Oval
- Hexagon washer
- Pan
- Cross
- Truss
- Torx
- Round
- Hex
- Truss
- Flat
- Phillips Drive
- Socket cap head
- Button head
- Slotted Drive
- Combination Drive
- Slotted hex washer
- Hex washer head
- Frearson Drive
- Pan
- Hex head
- Oval
- 5 CSF
- Class 2A (Medium fit)
- 2G
- custom
- 5 ONF
- 3G
- 4G
- 8G
- Class 1A (Loose fit)
- 6G
- Class 3A (Tight fit)
- 5 HF
Request For Quote
Get Instant Pricing From ASTM A193 B8M Bolts Supplier in India
Buy A193 B8M Class 1 and Class 2 Stud Bolts at Low Cost Worldwide
Grade & Type Guide
B8M Stud Bolt Grade and Type Guide
S31600UNS
30 / 75 ksiYield / Tensile
Solution AnnealedHeat Treatment
Full Thread Stud Bolt
M6–M100, ASME B18.31.3
Heavy Hex Bolt
ASME B18.2.2 head
Flange Bolt
Chemical plant piping
U Bolt
Pipe support clamps
S31600UNS
95 / 110 ksiYield / Tensile
Strain HardenedHeat Treatment
Full Thread Stud Bolt
Diameter ≤ M20
Heavy Hex Bolt
High torque flange joints
Flange Bolt
Marine & offshore use
U Bolt
High load pipe support
S31600UNS
80 / 100 ksiYield / Tensile
Strain HardenedHeat Treatment
Full Thread Stud Bolt
Diameter M20–M30
Heavy Hex Bolt
Pharma & chemical flanges
Flange Bolt
Refinery piping joints
U Bolt
Medium load clamps
S31600UNS
50 / 90 ksiYield / Tensile
Strain HardenedHeat Treatment
Full Thread Stud Bolt
Diameter M30–M36
Heavy Hex Bolt
Large diameter flanges
Flange Bolt
Structural piping racks
U Bolt
Heavy duty support
Supplier and Stockist of ASTM A193 B8M Class 2 Hex Bolt in Different Sizes M8, M10, M12 and M20
ISO Certified ASTM A193 B8M Bolts Manufacturer in India, offers various sizes with third-party inspection to the USA, Europe, Morocco, Australia and UK
| Dia | Length | |
|---|---|---|
| Hex Bolt | M10 – M110 (1/2″ – 4.0″) | 12 – 1200mm (1/2″ – 52″) |
| Stud Bolt | M10 – M110 (1/2″ – 4.1/2″) | 12 mm – 6000 mm (1/2″ – 236″) |
| Eye Bolts | M10 – M48 | |
| Hex Nut | M6 – M110 (1/4″ – 4.5″) | |
| Plain Washer | M6 – M110 (1/2″ – 4.1/2″) |
Price List
Price List of ASTM A193 B8M Bolts
ASTM A193 B8M Bolts Manufacturer, Buy Class 1 and Class 2 Stud Bolts at Lowest Export Price
Grade Comparison
Difference Between ASTM A193 B8M vs ASTM A193 B8 Bolts
Standard Grade (UNS S30400)
Marine Grade (UNS S31600)
B8M is preferred over B8 wherever chloride exposure or salt water contact is expected
Exporter of SA 193 Gr B8M Threaded Rod in Various Torque Specs With UNC, BSF and UN8 Thread
Buyer’s Guide
Which Thread Type Do You Need in SA 193 B8M Threaded Rod?
UNC Coarse
Fast assembly, higher tolerance to dirt and minor thread damage on site.
UNF Fine
Higher tensile strength per bolt, used where vibration resistance matters.
UNJ Radiused Root
Higher fatigue life for critical or repeated-load joints.
UNR Rolled Thread
Cold-rolled root radius, better fatigue strength than cut threads.
Check ASTM A193 B8M Bolts Stockists, Gives Excellent Torque Chart for Bolts
| BOLT | DIA | 1 | 2¾ | 1/2 | 3 | 5/8 | 3/4 | 7/8 | 9/16 | 1⅛ | 1⅜ | 1¼ | 1½ | 1⅝ | 19/16 | 1¾ | 1⅞ | 2¼ | 2 | 2½ | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TORQUE FT-LBS | 70% | Torque | 249 | 2300 | 36 | 3008 | 73 | 129 | 166 | 53 | 297 | 435 | 417 | 574 | 445 | 392 | 561 | 696 | 1234 | 853 | 1709 |
| 30% Initial | 107 | 986 | 16 | 1289 | 31 | 55 | 71 | 23 | 127 | 186 | 179 | 246 | 191 | 168 | 240 | 298 | 529 | 366 | 733 | ||
| 100% Final | 356 | 3285 | 52 | 4297 | 104 | 184 | 237 | 75 | 424 | 622 | 596 | 821 | 636 | 560 | 801 | 994 | 1762 | 1219 | 2442 |
| BOLT | DIA | 9/16 | 5/8 | 7/8 | 1 | 1⅛ | 3/4 | 2¾ | 1¼ | 1½ | 1⅜ | 19/16 | 1¾ | 1⅝ | 1⅞ | 2¼ | 2 | 2½ | 1/2 | 3 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TORQUE NM | 70% | Torque | 72 | 99 | 225 | 338 | 403 | 175 | 3118 | 565 | 778 | 590 | 531 | 761 | 603 | 944 | 1673 | 1157 | 2317 | 49 | 4078 |
| 30% Initial | 31 | 42 | 96 | 145 | 172 | 75 | 1337 | 243 | 334 | 252 | 228 | 325 | 259 | 404 | 717 | 496 | 994 | 22 | 1748 | ||
| 100% Final | 102 | 141 | 321 | 483 | 575 | 249 | 4454 | 808 | 1113 | 843 | 759 | 1086 | 862 | 1348 | 2389 | 1653 | 3311 | 71 | 5826 |
View ASTM A193 B8M Bolts Supplier in India, Get A193 B8M Fasteners in UNC, UNF, Metric Threads at Low Cost

ASTM A193 B8M U Bolts
- Pipe Support Clamping
- Bent Rod Construction
- Marine Grade Corrosion Resist.

SA 193 Grade B8M Square Bolts
- Square Under-Head Fit
- Anti-Rotation Locking
- Structural Timber & Steel

ASTM A193 Gr B8M Hex Bolts
- Standard Six-Sided Head
- ASME B18.2.1 Dimensions
- General Fastening Use

A193 Gr B8M Eye Bolts
- Looped Head For Lifting
- Rigging & Anchoring Use
- M10 to M48 Range

ASTM A193 B8M Class 2 Lag Bolts
- Coarse Self-Tapping Thread
- High Strain-Hardened Strength
- Structural Timber Fixing

SA 193 Grade B8M Carriage Bolts
- Round Smooth Head
- Square Neck Anti-Turn
- Structural Steel Assembly

ASTM A193 Gr B8M Hex Head Bolts
- Wrench-Driven Installation
- Class 1 & Class 2 Options
- Structural & Piping Joints

ASME SA 193 Gr B8M Anchor Bolts
- Foundation Embedment
- L-Bend & J-Bend Styles
- Base Plate Fixing

ASTM A193 B8M Allen Cap Bolt
- Hex Socket Drive Head
- Low Profile Fit
- Machinery & Instrumentation
Request For Quote
Get a Quote From ASTM A193 B8M Heavy Hex Bolts Stockist in India
Bulk Enquiry Support for A193 B8M Class 1 and Class 2 Bolting
Dealer and Distributor of B8M Grade Stainless Steel Bolt Heat Treatment and A193 B8M Class 1 Studs Weight Chart
View ASTM A193 B8M Bolts Stockists, Gives Accurate Dimension Chart For Customer Requirements

| Diameter (D) | 3 | 05/8 | 2 1/4 | 03/4 | 1 | 1 3/4 | 1 1/8 | 1 3/8 | 1 1/4 | 1 1/2 | 2 | 07/8 | 2 1/2 | 01/2 | 2 3/4 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Across the Flats (F) | MIN | 4.475 | 1.031 | 3.388 | 1.212 | 1.575 | 2.662 | 1.756 | 2.119 | 1.938 | 2.3 | 3.025 | 1.394 | 3.75 | 0.85 | 4.112 |
| MAX | 4.625 | 1.062 | 3.5 | 1.25 | 1.625 | 2.75 | 1.812 | 2.188 | 2 | 2.375 | 3.125 | 1.438 | 3.875 | 0.875 | 4.25 | |
| Body Diameter (D) | MIN | 2.961 | 0.605 | 2.214 | 0.729 | 0.976 | 1.716 | 1.098 | 1.345 | 1.223 | 1.47 | 1.964 | 0.852 | 2.461 | 0.482 | 2.711 |
| MAX | 3.081 | 0.642 | 2.305 | 0.768 | 1.022 | 1.785 | 1.149 | 1.404 | 1.277 | 1.531 | 2.039 | 0.895 | 2.559 | 0.515 | 2.827 | |
| Across the Corners © | MIN | 5.102 | 1.175 | 3.862 | 1.383 | 1.796 | 3.035 | 2.002 | 2.416 | 2.209 | 2.622 | 3.449 | 1.589 | 4.275 | 0.969 | 4.688 |
| MAX | 5.34 | 1.227 | 4.041 | 1.443 | 1.876 | 3.175 | 2.093 | 2.526 | 2.309 | 2.742 | 3.608 | 1.66 | 4.474 | 1.01 | 4.907 | |
| Thread Lengths (T) | > 6” | 6 | 1.75 | 5 | 2 | 2.5 | 4 | 2.75 | 3.25 | 3 | 3.5 | 4.5 | 2.25 | 5.5 | 1.5 | 6 |
| < 6” | 6.25 | 1.5 | 4.75 | 1.75 | 2.25 | 3.75 | 2.5 | 3 | 2.75 | 3.25 | 4.25 | 2 | 5.25 | 1.25 | 5.75 | |
| Head Height (H) | MIN | 1.815 | 0.378 | 1.327 | 0.455 | 0.591 | 1.054 | 0.658 | 0.81 | 0.749 | 0.902 | 1.175 | 0.531 | 1.479 | 0.302 | 1.632 |
| MAX | 2.06 | 0.444 | 1.548 | 0.524 | 0.7 | 1.196 | 0.78 | 0.94 | 0.876 | 1.036 | 1.388 | 0.604 | 1.708 | 0.364 | 1.869 |
Applications
ASTM A193 B8M Class 2 Hex Bolt Applications
ASTM A193 B8M Stud Bolt
- UNS S31600, Class 1 & 2
- M10 to M110
- Double end, full thread
ASTM A194 Grade 8M Hex Nut
- Recommended pair for B8M bolts
- M6 to M110
- Heavy hex & standard hex
SS 316 Plain Washer
- Recommended washer grade
- M6 to M110
- Load distribution under nut
Find ASTM A193 B8M Bolts Stockists, Gives Accurate Weight Chart for Stud Bolts
| A193 B8M Class 2 Stud Bolts Diameter (inches) | Weight per Inch (lbs) | Weight per Foot (lbs) |
|---|---|---|
| 1/2″ | 0.16 | 1.92 |
| 5/8″ | 0.26 | 3.12 |
| 9/16″ | 0.21 | 2.52 |
| 1/4″ | 0.04 | 0.48 |
| 1-1/8″ | 0.86 | 10.32 |
| 2″ | 2.80 | 33.60 |
| 1-3/4″ | 2.14 | 25.68 |
| 3/8″ | 0.09 | 1.08 |
| 5/16″ | 0.06 | 0.72 |
| 1-1/2″ | 1.56 | 18.72 |
| 7/16″ | 0.12 | 1.44 |
| 1-1/4″ | 1.06 | 12.72 |
| 1″ | 0.66 | 7.92 |
| 3/4″ | 0.38 | 4.56 |
| 7/8″ | 0.52 | 6.24 |
A193 B8M Class 1
- Solution annealed only, no cold work
- Lower yield, higher ductility
- General purpose bolting duty
30 / 75 ksi Yield / Tensile
A193 B8M Class 2
- Cold worked after solution treatment
- Higher yield, diameter-dependent strength
- Preferred for high-pressure flange joints
Up to 95 / 110 ksi (≤M20)
Request For Quote
Get a Direct Quote From the ASTM A193 B8M Bolts Manufacturer in India
Get B8M Stud Bolts in various thread types at factory price, fast delivery in Europe and Saudi
Check A193 Gr 8M Socket Head Cap Screw Chemical Composition, Equivalent Grades and Mechanical Properties
CE Approved ASTM A193 B8M Bolts Manufacturer in India Provides Best Bolts With Provides Outstanding Advantage
High Temperature Strength
Rated for continuous hot service
800°C
High
Chloride & Pitting Resistance
Molybdenum-alloyed bolting grade
2–3%
High
Cryogenic Service Rated
Stable toughness in sub-zero duty
-198°C
Excellent
Non-Magnetic Property
Austenitic microstructure
Low
Austenitic
Weld-Friendly, Low Sensitization
Resists carbide precipitation
0.08% max
Not Required
High Strength-to-Weight Ratio
Strain hardened Class 2 option
95 ksi
110 ksi
UNS S31600
C0.08 max
Si1.00 max
P0.045 max
Cr18.0 – 20.0
S0.030 max
Ni8.0 – 11.0
Mo2.00 – 3.00
Check ASTM A193 B8M Bolts Supplier in India, Molybdenum-Bearing Grade for Marine and Chemical Projects
Greece
4 weeks
UK
4 weeks
Poland
4 weeks
Ukraine
4 weeks
Spain
4 weeks
USA
45-60 days
Canada
60-70 days
Mexico
30-40 days
Panama
40 days
Costa Rica
50 days
Denmark
40-50 days
Equivalent Grade Chart for Global Buyers Sourcing ASTM A193 B8M Bolts
- Cold Forging
- CNC Machined
- Hot Forging
- Tensile Testing
- Hardness Testing
- Chemical Analysis
- 100% Tested with MTC EN 10204 3.1/3.2
Vision Alloys is an ASTM A193 B8M Bolts Manufacturer in India, mechanical values vary by diameter per ASTM A193
PED Approved ASTM A193 B8M Bolts Supplier in India, Offering High Strength Bolting for Pressure Retaining Joints
Project Reference
ASTM A193 B8M Bolts Client Reference
United Arab Emirates
Offshore Platform Expansion
Saudi Arabia
Petrochemical Refinery Upgrade
Germany
Structural Steel Framework
Singapore
Marine Shipyard Fabrication
Australia
Desalination Plant Project
Brazil
Power Plant Piping Upgrade
Request For Quote
Send Your Enquiry for ASTM A193 B8M Structural Stud Bolts
Custom Sizes and Coatings Available on Bulk B8M Bolt Orders
Class 1
All Diameters, Solution Annealed
Class 2 (M20–M30)
Strain Hardened, Mid Diameter
Class 2 (≤M20)
Strain Hardened, Highest Strength
| Bolting Grade | ASTM A193 Grade B8M, B8M2, B8M3 |
|---|---|
| Recommended Washer Grade | SS 316 |
| Recommended Nut Grade | ASTM A194 Grade 8M / 8MA |
Global Reach
Global Supply Locations of ASTM A193 B8M Bolts
Countries & Cities Served Worldwide
North & South America
🇨🇦 Canada
🇲🇽 Mexico
🇧🇷 Brazil
Europe
🇪🇸 Spain
🇵🇱 Poland
🇳🇱 Netherlands
🇩🇪 Germany
🇮🇹 Italy
🇮🇪 Ireland
🇩🇰 Denmark
Middle East
🇸🇦 Saudi Arabia
🇶🇦 Qatar
🇹🇷 Turkey
📍 Doha
📍 Dammam
📍 Riyadh
📍 Abu Dhabi
📍 Al Jubail
📍 Al Khobar
Africa
🇳🇬 Nigeria
Asia Pacific
🇦🇺 Australia
FAQs
ASTM A193 B8M Bolts
What sizes are available in B8M bolts?
M3 to M150, custom up to 6″.
Difference between ASTM A193 B8 and B8M?
B8M has 2-3% Mo; B8 has none.
Difference between B8M Class 1 and Class 2?
Class 1 is annealed; Class 2 is strain hardened.
Do you provide a mill test certificate?
Yes, EN 10204/3.1B with every batch.
What is the UNS number for B8M bolts?
UNS S31600.
What is the working temperature range?
-198°C to 800°C.
Which nut grade suits B8M bolts?
ASTM A194 Grade 8M / 8MA.
What is the max yield strength of B8M Class 2?
95 ksi for diameters ≤ M20.
- Vision Alloys is A Manufacturer of Steel Fasteners Company in India
- Dealers and Distributors of Bolting Products in USA, Europe, New Zealand, Algeria, United Kingdom, Morocco, South Africa and Australia, Egypt, Peru, chile, Jordan, Argentina
- Manufacturer and Supplier of Stainless Steel, Nickel Alloy, Titanium, Copper Materials in Mumbai.
- Stockist and Trader of Top Quality High Temperature Alloys for Oil and Gas Industry and Standard & Custom Sizes in EX Stock

