AISI 4340 Fasteners Technical Brief Snapshot
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
19+ countries • GCC, Africa & Americas
Testing Offered
UT, MPI, mechanical & chemical • MTC 3.1 & 3.2
Shipment Documents
Invoice, Packing List • COO, COI, MTC, BL & Lab Report
Table of Content
On-Demand SAE 4340 Bolts Manufacturer in India With Zero-Microcrack Guarantee, Refer Composition
When a joint can’t afford to fail, the fastener grade matters as much as the design. That’s why buyers across South Africa, the UAE, Kenya and Canada come to us for AISI 4340 fasteners, a nickel-chromium-molybdenum steel built for high-load, high-vibration and shock-loaded assemblies. Our ex stock range covers everything from AISI 4340 bolts and SAE 4340 fully threaded stud bolts to heavy hex bolts, nuts and washers, so most orders ship within 48 hours, not weeks.
Every SAE 4340 nut and stud is 100% ultrasonic and magnetic particle screened before threading, backed by our zero microcrack guarantee and full mill test certification. As a direct manufacturer, we deal without trader layers, so pricing stays tight and answers come fast. Whether it’s a single prototype UNS G43400 stud or a container load of 4340 steel anchor bolts for a critical application build, our engineering desk confirms grade and temper before you commit.
AISI 4340 Fasteners Specification
As a leading AISI 4340 fasteners manufacturer in India exporting globally, we quote direct from the mill, no middlemen involved.
AISI 4340 Fasteners Size & Thread
- M6 to M48
- ¼″ to 2″ diameter
- UNC, UNF & Metric thread
AISI 4340 Bolts Head & Drive Type
- Hex, Heavy Hex, Socket Head
- DIN 931, DIN 933, ASME B18.2.1
SAE 4340 Nuts Governing Standards
- ASTM A29 / ASTM A322
- SAE J404 / AMS 6414
UNS G43400 Screws Dimensional Standards
- ASME B18.2.1 / B18.2.2
- DIN 931 / 933 / 934
- ISO 4014 / 4017 / 4032
WNR 1.6511 Nut and Screws Finish
- Black Oxide, Zinc, Cadmium
- Passivated or Bright finish
JIS SCM439 Threaded Rod Testing & Documentation
- UT, MPI, Tensile, Hardness
- MTC, PMI & TPI on request
SAE 4340 Washers Critical-Service Compliance
- NACE MR0175 on request
- AMS aerospace traceability
SAE 4340 Fully Threaded Stud Bolts Supporting Material
- Matching nuts & flat/lock washers
- VCI-treated export packing
Alloy Steel AISI 4340 Double End Studs Manufacturing Origin
- Indian, European, Japanese mills
- Origin certificate on request
Extreme Tensile Strength WNR 1.6511 Nut and Screws Ready Inventory in Mumbai For Critical-Application
4340 Steel Anchor Bolts Applications
Fast, reliable dispatch is why buyers pan India and export markets pick us across these industries that specify AISI 4340 fasteners most.
SAE 4340 Bolt Manufacturing Standards
Before dispatch, we verify every forged and machined fastener's dimensions against these governing codes.
AISI 4340 Fasteners Types
Backed by ex stock inventory across sizes and finishes, we're a leading AISI 4340 fasteners supplier in India.
AISI 4340 Hex Bolt
ASME B18.2.1 • M6–M48- General high-strength bolting
- UNC, UNF & Metric thread
Steel 4340 Heavy Hex Bolt
ASME B18.2.1 • Structural- Wider bearing surface
- Suited to flanged, structural joints
AISI 4340 Double End Stud
Custom Length • M8–M48- Threaded both ends, plain shank
- Common in flange & valve bolting
SAE 4340 Heavy Hex Nut
ASME B18.2.2 • Structural- Paired with heavy hex stud bolts
- Higher proof load capacity
SAE 4340 Fully Threaded Stud Bolt
ASTM A354 • With Nuts- Continuous thread for adjustable grip
- Supplied with matching heavy hex nuts
WNR 1.6511 Hex Nut
DIN 934 • M6–M48- Matched hardness to bolt grade
- Standard & heavy hex profile
SAE 4340 Washer
Flat & Lock Type- Load distribution under the nut
- Hardened for high-torque joints
4340 Threaded Rod
Full Length • Cut To Size- Continuous thread, custom cut length
- UNC, UNF & Metric options
AISI 4340 Socket Head Cap Screw
DIN 912 • M6–M36- Compact head for tight clearance
- Used in machinery & tooling
AISI 4340 Fasteners Manufacturer In Mumbai Since 2012
Get zero-microcrack certified bolts and studs, forged, threaded and heat-treated in-house.
36CrNiMo4 eye bolts Chemical Composition
Deep hardenability and toughness come from the ASTM A29 SAE J404 nickel chromium molybdenum makeup behind AISI 4340 Chemical Composition.
Steel 4340 Heavy Hex Bolts Mechanical Properties
These AISI 4340 Mechanical Properties reflect standard quenched and tempered stock at 28 to 32 HRC, actual values vary per order.
AISI 4340 Equivalent Material
As a leading AISI 4340 fasteners exporter, we work with the same Ni Cr Mo chemistry behind AISI 4340 Equivalent Material In India globally.
ASTM / SAE / AISI (USA)
- AISI / SAE 4340
- UNS G43400
- ASTM A29 / A322
- AMS 6414 / AMS 6415
DIN / EN (Germany)
- Werkstoff 1.6511
- EN 36CrNiMo4 (close equivalent)
- DIN EN 10083-3
BS (United Kingdom)
- BS 817M40 (En24)
- Follows EN 10083-3 chemistry
JIS (Japan)
- SNCM439 (nearest Ni-Cr-Mo match)
- JIS G4103
GB (China)
- 40CrNiMoA
- GB/T 3077
IS (India)
- IS 4367 EN24 chemistry
- Confirm against your drawing spec
Building To A Specific International Standard?
Tell us your DIN, JIS, BS or ISO reference - we cross-match the equivalent grade and dispatch accordingly.
Steel 4340 Hex Head Bolts Heat Treatment & Hardness Range
This grade is best known for deep hardenability, reached through four stages that carry raw billet to a fastener ready temper.
Normalizing
Heated near 870°C and air cooled to refine grain structure.
Austenitize & Quench
Heated to approx. 845°C, then oil quenched for full hardness.
Tempering
Reheated between 200–650°C to set the final hardness band.
Stock Condition
Held ex-stock at 28–32 HRC, the common fastener-grade temper.
Need a different temper for your design load? Share your target hardness with your RFQ.
Your SAE 4340 Bolts Partner In Africa & The Gulf
Buyers across Southern Africa and the Gulf region get both ex stock inventory and mill order dispatch from us.
Johannesburg, SADurban, SA
Kampala, Uganda
Dubai, UAE
Riyadh, KSA
Istanbul, TurkeyAISI 4140 Fasteners vs AISI 4340 Fasteners
AISI 4140 vs 4340 both are low alloy steels used for high strength bolting, but they differ in alloying content and where each is best specified.
AISI 4140 Fasteners
- Alloying: Chromium-Molybdenum, no nickel
- Hardenability: Good, thinner sections
- Toughness: Moderate
- Best For: General high-strength bolting
- Relative Cost: Lower
AISI 4340 Fasteners
- Alloying: Nickel-Chromium-Molybdenum
- Hardenability: Deep, thicker sections
- Toughness: Higher, better shock resistance
- Best For: Critical, high-load, shock-loaded joints
- Relative Cost: Higher
SAE 4340 Bolts Exporter In India To Durban, South Africa
Container-ready pricing on hex bolts, studs and nuts, packed for long-haul sea freight.
Alloy Steel AISI 4340 Double End Studs Series & Size Chart
Most disputes at goods inward trace back to a UNC/UNF or coarse/fine pitch mismatch, so verify your thread series before ordering.
Why Thread Series Matters
Need An Exact Torque Chart?
Torque values depend on lubrication, joint condition and target preload - share your size, grade and application and we’ll return an application-specific torque recommendation with your quotation.
Request Torque ChartFrom Toronto To Manila - SAE 4340 Bolts On Demand
Our ex stock supply lines reach North American buyers, with demand steadily rising across Southeast Asia too.
Toronto, CanadaHouston, USA
Mexico
Singapore
Manila, Philippines
Malaysia
Indonesia
VietnamSAE 4340 Fully Threaded Stud Bolts Zero-Microcrack Process
These four checks catch quench cracking, 4340's biggest risk, before any fastener leaves our facility.
100% Ultrasonic Testing
Every bar screened for sub-surface flaws before machining.
Magnetic Particle Inspection
Surface and near-surface cracking checked post heat-treatment.
Hardness & PMI Verification
Confirms the temper and alloy match the ordered grade.
Heat-Number Stamping
Traceable marking before the MTC pack is issued.
Need Mill Test Certificates With WNR 1.6511 Nut and Screws Order?
EN 10204 3.1 paperwork comes standard with every heat, 3.2 third-party witnessed available on request.
ASTM A29 AISI 4340 Fasteners Supplier In Ahmedabad
We match every batch to your drawing spec, backed by full MTC traceability before dispatch.
SAE 4340 Washers Manufacturing Process
Quality without compromise defines every stage from billet to finish at our ISO certified AISI 4340 fasteners manufacturer in Mumbai.
Forging
Billet upset-forged to blank under controlled temperature.
Quench & Temper
Oil quenched then tempered to the ordered hardness band.
CNC Threading
Head, shank and thread cut to ASME B18.2.1 tolerances.
Test & Mark
UT, MPI and hardness testing before heat-number stamping.
JIS SCM439 Threaded Rod Delivery Timeline
Order and payment confirm and fasteners leave Mumbai right away, choose freight below, transit depends on destination port.
Ex-Stock Dispatch
Ready inventory leaves our facility within 2–5 working days
Sea Freight
Lowest-cost route, 1–4 weeks transit and it varies by destination
Air Freight
3–7 days for urgent shutdown or breakdown orders
Country-Specific ETA
Give us your port or airport code for a firm delivery date
WNR 1.6511 Studs Testing & Certification
As a dedicated AISI 4340 fasteners exporter with in house documentation, we record every requested check right onto your MTC.
UNS G43400 Screws Supply References
A look at recent shipments to buyers across Africa, the Middle East and North America through our export network.
M24 AISI 4340 Heavy Hex Bolts - Mining Crusher Assembly
28–32 HRC, UT & MPI tested, EN 10204 3.1 MTC.
Mining Equipment Contractor, South Africa
JOHANNESBURG, SOUTH AFRICAM20 SAE 4340 Stud Bolts - Wellhead Christmas Tree Package
NACE MR0175, third-party witnessed.
Oilfield Services Contractor, UAE
ABU DHABI, UAEM30 AISI 4340 Anchor Bolts - Cement Plant Foundation
L-bend type, MTC 3.1, custom cut length.
Industrial EPC Contractor, Kenya
MOMBASA, KENYAM16 SAE 4340 Fully Threaded Studs - Axle Assembly Line
Zinc plated, matched heavy hex nuts.
Automotive Component Manufacturer, Canada
TORONTO, CANADAM36 AISI 4340 Eye Bolts - Offshore Lifting Package
Shoulder type, PMI tested, full traceability.
Marine Rigging Supplier, USA
HOUSTON, TEXAS, USAM12 AISI 4340 Socket Head Cap Screws - Defense Fixture Build
AMS 6414 traceable, black oxide finish.
Precision Engineering Contractor, UK
BIRMINGHAM, UKTop Export Countries
South Africa
UAE
Kenya
Canada
United Kingdom
Saudi Arabia
Turkey
Singapore
Mexico
Thailand
Italy
Netherlands
Germany
Philippines
Vietnam
AISI 4340 Fasteners FAQs
Answers to what buyers ask most before ordering, from a leading AISI 4340 fasteners manufacturer in India.
What material is SAE 4340 Washers and UNS G43400 Screws?
AISI 4340 is a low-alloy, nickel-chromium-molybdenum steel valued for high tensile strength, deep hardenability and good toughness in the quenched and tempered condition.
What is the largest size Alloy Steel AISI 4340 Double End Studs you manufacture?
We forge AISI 4340 studs and bolts from M6 to M48 (¼"-2" dia), custom lengths. Larger sizes made to order - share your specs for feasibility and lead time.
Do JIS SCM439 Threaded Rod and WNR 1.6511 Studs need a coating for offshore or marine service?
Yes. AISI 4340 has no inherent corrosion resistance, so marine duty needs a finish typically galvanizing, zinc flake, PTFE or cadmium. Share your environment and we'll advise the right one.
Do you supply Steel 4340 Hex Head Bolts and 4340 Steel Anchor Bolts to South Africa, UAE and Canada?
Yes - we manufacture and export AISI 4340 bolts, studs, nuts and washers to Southern Africa, the GCC and North America with full MTC and export documentation.
What is the difference between AISI 4140 and AISI 4340 fasteners?
4140 is a chromium-molybdenum steel with no nickel, good for general high-strength bolting. 4340 adds nickel for deeper hardenability and higher toughness, making it suited to critical, high-load applications.
Authorized Supplier For The Following Companies - Material At Reseller Price For Traders
