ASTM A320 B8 Bolts Quick Overview
Mortec At A Glance
Established
Since 2012 • 14+ 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 & impact test • MTC EN 10204 3.1 & 3.2
Shipment Documents
Invoice, Packing List • COO, COI, MTC, BL & Lab Report
Table of Content
High Precision A320 B8 Class 2 Stud Bolt Manufacturer in India in Class 1/2
Flanged seals in sub-zero service temperatures require specialized ASTM A320 bolting. Global buyers choose our premium ASTM A320 B8 Bolts for extreme cold. Our massive ex-stock inventory ensures quick orders ship within a few days. Every A320 B8 stud ships with complete mill test certification documents.
We utilize heavy-duty export packing specifically engineered for long-haul freight transport. As a dedicated ASTM A320 B8 Bolts exporter, we deal direct from the primary manufacturing mill. Eliminating middleman trader layers provides better pricing and faster project answers. You place critical fast-shipping orders with complete confidence instead of guesswork.
ASTM A320 B8 Bolts Specification
Share your class, diameter and length for a same-day ex-Mumbai A320 B8 stud quote – MTC included with every dispatch.
A320 B8 Class 2 Stud Bolt Thread Standard
- ASME B1.1 unified thread form
- ASME B18.2.1 / B18.2.2 dimensions
ASTM A320 Grade B8 Class 2 Screws Surface Finish
- Bright, pickled & passivated
- Electropolished on request
A193 Grade B8 Studs Low-Temperature Impact Testing
- Charpy impact per A320 supplementary requirement S2
- Available on request for cryogenic orders
A320 Gr 8 Class 1 Nut Marking
- Grade symbol & manufacturer ID stamped per A320
- Class marking on head or end face
A320 B8 Class 2 Stud Bolt Diameter Limit Compliance
- Full Class 2 strength guaranteed up to 3/4″
- Above 3/4″, supplied to Class 1 properties
ASME A320 Gr B8m Bolts Manufacturing Process
- Thread rolled or CNC turned
- Made from certified round bar stock
ASTM A320 B8 Bolts Size Range
- 1/4" to 4" diameter, M6 to M100
- Custom lengths cut as per drawing
ASTM A320 B8 Nuts & Washers Matching Grades
- ASTM A194 Gr 8 / 8A heavy hex nuts
- ASTM F436 hardened & flat washers
A320 Grade B8 Studs Chemistry & Mechanical
- Type 304 base: 18-20% Cr, 8-11% Ni
- Class 1: 75 ksi tensile, 30 ksi yield min
Supplier Of Stainless Steel A320 Gr B8 Hex Bolts and Nut in Mumbai with Diameter upto 3⁄4 in. or Custom
ASTM A320 B8 Class 2 Bolts Size Chart
Order A320 B8 Class 2 Stud Bolt & ASTM A320 B8 Nuts with custom sizes for immediate dispatch.
| Size in Inch | Hex Bolt Diameter (in) | Bolt Head Height | Bolt Width Across Flats | ||
|---|---|---|---|---|---|
| Nominal (in) | Min. (in) | Nominal (in) | Min. (in) | ||
| 1-1/8" | 1.1250 | 3/4" | 0.658 | 1-11/16"(1.688) | 1.631 |
| 1/4" | 0.2500 | 11/64" | 0.150 | 7/16"(0.438) | 0.425 |
| 1/2" | 0.5000 | 11/32" | 0.302 | 3/4"(0.750) | 0.725 |
| 5/16" | 0.3125 | 7/32" | 0.195 | 1/2"(0.500) | 0.484 |
| 3/8" | 0.3750 | 1/4" | 0.226 | 9/16"(0.562) | 0.544 |
| 1-7/8" | 1.8750 | 1-1/4" | 1.130 | 2-13/16"(2.812) | 2.719 |
| 5/8" | 0.6250 | 27/64" | 0.378 | 15/16"(0.938) | 0.906 |
| 3/4" | 0.7500 | 1/2" | 0.455 | 1-1/8"(1.125) | 1.088 |
| 7/8" | 0.8750 | 37/64" | 0.531 | 1-5/16"(1.312) | 1.269 |
| 1" | 1.0000 | 43/64" | 0.591 | 1-1/2"(1.500) | 1.450 |
| 1-3/8" | 1.3750 | 29/32" | 0.810 | 2-1/16"(2.062) | 1.994 |
| 1-1/4" | 1.2500 | 27/32" | 0.749 | 1-7/8"(1.875) | 1.812 |
| 1-5/8" | 1.6250 | 1-3/32" | 0.978 | 2-7/16"(2.438) | 2.356 |
| 1-1/2" | 1.5000 | 1" | 0.902 | 2-1/4"(2.250) | 2.175 |
| 1-3/4" | 1.7500 | 1-5/32" | 1.054 | 2-5/8"(2.625) | 2.538 |
| 2" | 2.0000 | 1-11/32" | 1.175 | 3"(3.000) | 2.900 |
A320 B8 Class 2 Stud Bolt Manufacturer In Mumbai Since 2012
Share your class, diameter and length - we quote ex-stock A320 B8 studs within hours.
ASTM A320 Grade B8 Class 2 Screws Heat Treatment Process
Heat treatment checks for ASTM A320 B8 Nuts are completed before shipment and documented for final approval.
A320 Grade B8 Bolts Types
We are a leading ASTM A320 B8 Bolts Supplier in India, with ex-stock stud bolts, hex bolts, nuts and washers.
A320 Gr B8 Hex Bolt
ASME B18.2.1 • Class 1/2- Wrench-fit head for flange joints
- Most-ordered form, held ex-stock
A320 B8 Class 2 Stud Bolt
Continuous Thread • Custom Length- Cut and threaded to your drawing
- Preferred for flange bolting sets
A320 B8 Class 2 Threaded Rod
ASME B1.1 • Full Length- Cut to length on request
- Suits long-span support bolting
A320 Grade B8 Class 1 Through Bolt
ISO 4762 / ASME B18.3- Machine & socket head screw options
- Annealed condition for machinability
A320 Grade B8 Class 2 Hex Bolt
Higher-Strength Bolt Profile- Paired with Class 2 studs for full rated load
- Standard or jam profile available
A320 B8 U Bolt
Pipe Clamp & Support Fixing- Custom bend radius to pipe OD
- Used on low-temperature pipe supports
ASTM A320 Gr 8 Stud Bolt Chemical Composition
A320 B8 Bolt Mechanical Properties
ASTM A320 B8 Bolt Equivalent
ASTM A320 B8 Bolt has equivalent grades used across different international material standards.
ASTM / ASME (USA)
- UNS S30400
- ASTM A320 Grade B8 (Low-Temp Bolting)
- ASTM A320 Grade B8 (General/High-Temp Bolting)
DIN / EN (Germany)
- Werkstoff 1.4301
- EN X5CrNi18-10
- EN 10269
BS (United Kingdom)
- BS 970 304S31
JIS (Japan)
- SUS304
AFNOR (France)
- Z6CN18-09
Common Trade Names
- Type 304 Stainless Steel
A320 B8 Class 2 Stud Bolt Low-Temperature & Cryogenic Service Limits
Our Canadian buyers often ask why ASTM A320 is specified separately from A193.
ASTM A320 Grade B8 Bolts Torque Chart
Refer to the torque chart below for accurate installation torque values.
| Bolt Size (inches) | Torque (ft-lb) | Torque (Nm) |
|---|---|---|
| 1/4" | 5-7 | 6.8-9.5 |
| 1/2" | 35-50 | 47.5-67.8 |
| 3/4" | 140-190 | 189.8-257.5 |
| 7/8" | 225-300 | 304.2-406.8 |
| 5/16" | 10-13 | 13.6-17.6 |
| 3/8" | 15-20 | 20.3-27.1 |
| 9/16" | 55-75 | 74.6-101.5 |
| 5/8" | 75-100 | 101.5-135.6 |
| 7/16" | 22-30 | 29.8-40.7 |
| 1" | 350-475 | 474.5-644.3 |
Need Impact Test Records With Your A320 B8 Order?
Class 2 stud lots ship with chemical and mechanical test data, upgradeable to 3.2 witnessed on request.
Stainless Steel A320 Gr B8 Hex Bolts Testing Methods
As a reputed ASTM A320 B8 Bolts Supplier in India, we ensure every batch has complete material traceability.
A320 B8 vs A193 B8 Bolts – Key Differences
One of the most common questions we get before a purchase order is confirmed.
ASTM A320 B8 Bolts Exporter In India To Jebel Ali, UAE
Low-temperature service studs packed and container-ready for Gulf shipment.
A320 B8 Class 1 vs Class 2 Bolt Strength & Diameter Limit
Frequently asked by our South African and Gulf engineers sizing flange bolt sets.
Class 1 (Solution Annealed)
- Yield Strength: 205 MPa / 30 ksi min
- Diameter: No upper class-strength limit
- Best For: Larger diameters & lower design stress joints
Class 2 (Carbide Solution Treated)
- Yield Strength: 690 MPa / 100 ksi min
- Diameter: Full properties guaranteed up to 3/4″
- Best For: Compact, high-strength flange bolting
A193 Grade B8 Studs Chloride & Coastal Service Guidance
A question we get often from our Kenyan and Gulf coastal buyers before confirming grade.
ASTM A320 B8 Bolt Applications
We are a trusted ASTM A320 B8 Bolts Manufacturer in India, ensuring quality and fast nationwide dispatch.
ASTM A194 Grade 8 Nut Supplier In Durban, Cryogenic-Service Compliant
Class 1 and Class 2 stud sets dispatched with full traceability to your Durban port agent.
A320 B8 Stud Bolt Dimensional Reference
After payment, A320 B8 bolts are inspected, packed and dispatched from Mumbai via your chosen shipping mode.
ASTM A320 B8 Bolt Torque
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 75–90% of the stud's proof load, derived from yield strength for the ordered class.
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.
Confirm Your K-Factor
K typically runs 0.18–0.22 dry on stainless threads and can drop with an anti-galling lubricant.
Verify By Test
For critical flanges we recommend a calibrated torque-tension test on a sample lot before production tightening.
Send your thread size, class & pitch and we'll return a size-specific torque figure - Request Your Torque Chart.
A320 B8 Bolt Delivery Timeline
Once payment clears, A320 B8 bolts are inspected, packed, and dispatched from Mumbai- choose your shipping mode.
Same-Week Ex-Works Dispatch
Stock orders for stud bolts and nuts clear our gate inside 3 working days
Ocean Freight – FCL & LCL
Best value on volume stud bolt orders, roughly 10 to 30 days port-to-port
Priority Air Cargo
Covers shutdown or turnaround deadlines, typically 4 to 6 days door-to-door
Destination-Wise Delivery Estimate
Share your discharge port and we return a confirmed ETA
ASTM A320 B8 Bolts Price Factors
Four variables move the per-piece or per-kg price most - share yours for an accurate quote.
ASTM A320 B8 Bolts FAQs
Quick answers to the questions buyers ask us most before placing an order.
What type of material is ASTM A320 Grade B8 Stud Bolts?
Type 304 austenitic stainless under the A320 low-temperature bolting standard, separate from B8M.
What material are A320 B8 Class 2 Hex Bolts made of?
Austenitic SS supplied Class 1 solution annealed or Class 2 solution treated and strain hardened.
What sizes are A320 B8 Class 2 Threaded Rods available in?
Class 2 runs 1/4" to 1-1/2", with strength values dropping as diameter increases.
What is the price basis for ASTM A320 B8 Bolts and Nuts?
Quoted per kg or per piece on daily SS base price, diameter, length and testing.
What is the equivalent grade for A320 Grade B8 Studs and Washers?
UNS S30400 matches EN 1.4301 and JIS SUS304, the base chemistry behind Grade B8.
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