• An ISO 9001:2015 Certified Company
Manifest Alloys

  • Call

    +91 9930108105

  • Email

    info@manifestalloys.com

  • Address

    Sanghvi Galaxy, Shop No.2, Khetwadi
    10th Lane, Mumbai-400004, India

A4-80 Bolts

Choose Manifest Alloys for A4-80 Bolt Sourcing

01

A4-80 Bolts Certified

  • Molybdenum-alloyed 316 base
  • Independently lab verified
02

In-House Thread Cutting

  • Custom pitch on demand
  • Drawing-matched tolerances
03

Same-Day RFQ Response

  • Quotes within business hours
  • Dedicated export desk
04

Global Freight Network

  • Sea & air freight tie-ups
  • Door delivery across 20+ nations
05

Zero-Defect Batch Inspection

  • 100% dimensional checking
  • Third-party inspection on request
A4-80 Bolt Specification Chart    

A4-80 Bolt Overview

  • Thread SeriesMetric, UNC, UNF
  • Thread PitchCoarse & Fine
  • Base Grade316 / 316L Stainless
  • Head Type RangeHex, Socket, Allen, Carriage
  • Ex-Stock Delivery3–5 Days
  • Custom Size Lead Time15–20 Days
  • Country of OriginIndia, Germany, Japan
  • BrandISO 9001:2015 Certified
  • MTC CertificateEN 10204 3.1 & 3.2
  • Minimum OrderAs Per Requirement
  • Size RangeM3-M64
  • Property Class80 (High Strength)
  • Tensile Strength800 MPa
  • Countries Served20+
  • Applicable StandardsISO 3506, DIN, ASTM
Table of Content
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NACE Certified DIN 931 A4-80 Hex Bolt Supplier in India

A4-80 bolts are high-strength 316 stainless steel fasteners manufactured by Manifest Alloys under strict quality control. These bolts resist chlorides better than standard 304 grades and suit marine, offshore, and chemical plant environments. They follow ISO 3506 property class 80 requirements, with sizes from M3 to M64 and custom sizes available on fast delivery. We export A4-80 bolts across USA, UK, Germany, UAE, and Saudi Arabia for structural bolting, pipe flanges, and equipment assembly.

A4-80 Bolt Specification

A4-80 Bolt Size Range

  • M3 - M64
  • Coarse & fine pitch available
  • Custom lengths on request

DIN 931 A4-80 Bolt Temperature Range

  • Assembly range 15°C to 25°C
  • Service range: -200°C to 400°C
  • Stable resistance up to 400°C

A4-80 Stud Bolt Hardness Range

  • 250 HV (max)
  • Equivalent: ≤99 HRB
  • Tested as per ISO 3506-1

ISO 3506 A4-80 Tensile Strength

  • 800 N/mm²
  • Min. proof stress: 640 N/mm²
  • Elongation: ≥25%

EN 1.4401 A4-80 Screws Melting Point

  • Up to 1400ºC
  • Softening begins near 900°C
  • Suited for high-load environments

UNS S31600 A4-80 Fasteners Testing Methods

  • Tensile test
  • EN 10204 / 3.1, 3.2
  • Microstructure analysis
  • Proof load test

A4-80 Hex Bolt Thread Type

  • Metric fine
  • UNC
  • UNF
  • UNJ
  • BSF

DIN 933 A4-80 Hex Nut Head Drive

  • Hex socket
  • Phillips
  • Slotted
  • Torx

A4-80 Stainless Steel Bolt Standards

  • ISO 4017
  • ISO 4762
  • ISO 3506
  • ASTM A193

DIN 931 A4-80 Hex Head Bolt DIN Standards

  • DIN 931
  • DIN 933
  • DIN 912
  • DIN 6923

A4-80 Bolt Surface Treatment

  • Passivation
  • Plain / self-colour
  • Electropolished

A4-80 Bolt Packaging & Storage

  • Cartons, wooden crates & pallets
  • Moisture-proof VCI packing
  • Custom labeling on request

PED Approved A4-80 Bolt Supplier in India every shipment ships with full compliance documentation.

DIN 931 vs DIN 933 A4-80 Bolt Difference

DIN 931 A4-80 Hex Bolt, Partial Thread
Thread CoveragePartial, plain shank
Best ForShear-load joints
Head StyleHex head
Size RangeM3 to M64
Best for shear-critical structural joints
DIN 933 A4-80 Hex Bolt, Full Thread
Thread CoverageFully threaded to head
Best ForTension joints, thin sections
Head StyleHex head
Size RangeM3 to M64
Best for tension joints & thin materials

Manufacturer of ISO 3506 A4-80 Stud Bolts and Nuts at Low Cost in Mumbai, Refer Torque Chart

Manifest Alloys manufactures A4-80 bolts in-house with complete traceability, from raw material to tested finished fastener.

Request a Quote

Supplier of DIN 931 A4-80 Stud Bolt at Low Cost in Mumbai, Refer Torque Chart

ISO 3506 A4-80 Bolt Torque Chart

Thread Coeff. of Friction Tightening Torque (Nm) Preload (kN) Min. Breaking Torque (Nm)
A2-70A1-50A4-80 A2-70A1-50A4-80 A2-70A1-50A4-80
M1.60.20.20.10.350.350.30.350.20.150.24
0.10.10.10.20.550.40.55
0.30.250.20.450.30.20.3
M2.00.20.30.250.40.50.40.50.40.30.48
0.10.20.150.30.60.50.6
0.30.40.40.550.360.250.36
M2.50.20.60.450.650.50.40.50.90.60.96
0.10.450.250.60.90.650.9
0.30.750.60.80.30.30.3
M3.00.21.111.60.650.60.651.61.11.8
0.110.851.310.91
0.31.351.251.850.450.40.45
M4.00.22.61.33.52.41.122.43.82.74.3
0.11.70.82.32.971.082.97
0.331.54.11.940.91.94
M5.00.25.12.46.93.931.833.937.85.58.8
0.13.41.64.64.852.264.85
0.36.12.883.191.493.19
M6.00.28.84.111.85.542.595.54139.315
0.15.92.886.853.26.85
0.310.44.813.94.492.094.49
M8.00.221.410.128.710.24.7510.2322337
0.114.56.819.312.65.8612.6
0.325.511.933.98.853.858.85

Site Engineer's Checklist

Site Engineer

Checks before installation

  • Checks for the "A4-80" marking on the bolt head
  • Confirms torque values before assembly to avoid thread galling
  • Matches washer and nut grade to prevent galvanic mismatch on site
Price per kg
₹ -- / kg
Price on request

Stockist A4-80 Hex Head Cap Screw in Custom Sizes as Per Customer Requirements

Pricing varies with size, head style, finish, order quantity and current 316-grade raw material rates - our team can quote the exact rate for your requirement.

Contact for Best Price
Certifications & Documentation

A4-80 Stud Bolt Test Certificates

Mill Test Certificate
  • Batch traceability & material composition report
  • EN 10204 · 3.1 / 3.2
ISO 9001:2015
  • Certified quality management system
  • ISO · 9001:2015
RoHS Compliant
  • Restriction of hazardous substances
  • RoHS · Directive
ASTM / ISO Compliant
  • Manufactured to global fastener standards
  • ASTM · ISO 3506

PED Approved A4-80 Bolt Manufacturer in India in-house production under a certified quality system.

Exporter of A4-80 Socket Head Cap Screw in Size Ranging From 10 mm to 60 mm With MTC EN 10204 3.1 & 3.2

BS EN ISO 3506-1 A4-80 bolts Size Chart

Specification M20M6M30M10M16M36M8M24M12
Thread Pitch (Coarse)2.51.03.51.52.04.01.253.01.75
Hex Bolt Width Across Flats30mm10mm46mm16mm24mm55mm13mm36mm18mm
Bolt Head Height12.5mm4mm18.7mm6.4mm10mm22.5mm5.5mm15mm7.5mm
SS Nut Width Across Flats30mm10mm46mm17mm24mm55mm13mm36mm19mm

SS A4-80 bolts HSN Code

7318

HSN Code

A4-80 Bolt HSN Code

  • Applies to A4-80 stainless steel bolts
  • Used for GST invoicing
  • Required for customs clearance on import/export
GST Invoicing Customs Clearance

PED Approved A4-80 Bolt Stockist in India ready inventory for urgent project schedules.

Procurement Manager's Checklist

Procurement Manager

Checks before placing a bulk order

  • Asks for the mill test certificate - EN 10204 3.1 confirms composition
  • Clarifies lead time for custom sizes - non-standard lengths take 15–20 days
  • Confirms packaging before large orders - VCI packing avoids moisture damage
Reliable A4-80 Bolt Supplier Worldwide

We supply A4-80 bolts to distributors, EPC contractors and OEMs across India, the Middle East, Europe and Southeast Asia.

Request a Quote

Stockist of ISO 3506 A4-80 Fasteners in Metric, UNC, UNF and BSF Thread Type, Check Chemical Composition

ISO 3506 A4-80 Stud Bolt Thread Types

Thread Style
Check A4-80 Stainless Steel Studs Mechanical Properties and Chemical Composition
  • Full body length threaded
  • Maximum grip depth
Full Length
Thread Style
Double End Stud
  • Threaded on both ends
  • Plain centre section
Dual Thread
Thread Style
Tap End Stud
  • Short thread one end
  • Plain shank other end
Single End
Thread Pitch
Metric Coarse Thread
  • Standard M pitch series
  • Faster assembly
ISO Metric
Thread Pitch
Metric Fine Thread
  • Tighter M x P pitch
  • Vibration resistant
ISO Metric
Thread Pitch
UNC / UNF Series
  • Unified inch threads
  • Imperial standard use
Imperial

A4-80 Bolt Chemical Composition

16.5–18.5%
Cr
10–13%
Ni
2.0–2.5%
Mo
Max 2.0%
Mn
Max 1.0%
Si
Max 0.08%
C
Max 0.045%
P
Max 0.03%
S
Balance
Fe
Alloying elements Base metal

ISO Certified A4-80 Bolt Manufacturer in India ISO 9001:2015 quality management system.

A4-80 Bolt Mechanical Properties

800N/mm²

Tensile Strength

640N/mm²

0.2% Proof Stress

0.3× d (min)

Elongation at Break

250HV (max)

Hardness (Vickers)

640N/mm²

Proof Load Stress

ISO Certified A4-80 Bolt Supplier in India traceable batches from raw material to dispatch.

Stainless Steel A4-80 Bolt Equivalent Grades

International

ISO 3506-1

  • Grade A4-80
Germany
Germany

DIN / Werkstoff

  • 1.4401
  • 1.4404
United States
United States

ASTM / UNS

  • Grade 316
  • UNS S31600
United Kingdom
United Kingdom

BS

  • Grade 316S31
Japan
Japan

JIS

  • Grade SUS316
European Union
European Union

EN

  • X5CrNiMo17-12-2

Types of A4-80 Marine Grade Bolts

DIN 931 A4-80 bolt

DIN 931 A4-80 Bolt

  • Hex head, partial thread
  • High tensile strength
  • Used for structural joints
DIN 933 A4-80 bolt

DIN 933 A4-80 Bolt

  • Hex head, full thread
  • Sizes M3 to M64
  • Used in general fastening
A4-80 stud bolt

A4-80 Stud Bolt

  • Double-end threaded rod
  • Supplied with matching nuts
  • Used for flange connections
A4-80 hex nut

A4-80 Hex Nut

  • Standard six-sided profile
  • Pairs with matching bolt sizes
  • High corrosion resistance
A4-80 socket head cap screw

A4-80 Socket Head Cap Screw

  • Hex socket drive
  • Passivated finish
  • Used in oil & gas industry
A4-80 Allen bolt

A4-80 Allen Bolt

  • Hex socket (Allen key) drive
  • ASME B18.6.3 dimensions
  • Compact head profile
A4-80 carriage bolt

A4-80 Carriage Bolt

  • Square neck anti-turn shank
  • Domed smooth head
  • Used in timber & cladding
A4-80 flat washer

A4-80 Flat Washer

  • Flat load-distributing disc
  • Prevents surface damage
  • Used under bolt/nut heads
A4-80 set screw

A4-80 Set Screw

  • Headless, fully threaded
  • Cone or flat point
  • Used for locking collars

ISO Certified A4-80 Bolt Stockist in India consistent grade quality across every reorder.

Marine Engineer's Checklist

Marine & Coastal Engineer

Checks before specifying A4-80

  • Chooses A4-80 over A2-70 for chloride exposure
  • Requests passivation on coastal projects for extra corrosion resistance
  • Confirms NACE-compliant options for offshore duty

A2-70 vs A4-80 Bolt Difference

A2-70 304 Stainless Grade
MolybdenumNot present
Tensile Strength700 N/mm²
Chloride ResistanceLimited
EnvironmentIndoor / Mild outdoor
Relative CostLower
Best for general & indoor duty
A4-80 316 Stainless Grade
Molybdenum2–2.5% added
Tensile Strength800 N/mm²
Chloride ResistanceExcellent
EnvironmentCoastal / Marine
Relative CostHigher
Best for marine & high-load duty
Trusted A4-80 Bolt Stockist in India

Large ready stock of A4-80 bolts across common sizes means faster dispatch for urgent project requirements.

Request a Quote

EN 1.4401 A4-80 bolts Weight Chart

LengthM16M6M22M10M5M18M12M8M20M14
90 mm19.841-41.6677.634-26.04210.9174.47233.11314.925
16 mm-0.743-3.2110.448--1.590--
150 mm29.412-58.82411.312-37.59416.340-48.54422.222
35 mm11.4161.120-4.2230.80416.0265.9742.27119.60810.000
220 mm40.650-79.36515.528--22.624-65.789-
55 mm14.4091.56030.1205.464-18.8687.7403.07123.81011.628
300 mm53.763-104.16720.325--29.940-87.719-
20 mm-0.812-3.4110.598-4.8921.711--
110 mm23.041-47.1708.881-31.25012.723-38.16817.730
70 mm16.8351.89035.4616.394-22.1249.0583.67127.77812.987
380 mm66.667-----37.037-108.696-
45 mm12.8211.340-4.8400.95817.2416.8592.67121.73910.504
170 mm32.680-64.93512.500--18.116-53.191-
60 mm15.2441.67032.0515.774-20.0008.1833.27025.12612.255
250 mm45.455-87.71917.301--25.381-74.627-
100 mm21.459-46.2968.251-27.77811.8204.87335.71416.340
25 mm-0.897-3.6600.660-5.2521.871-8.170
190 mm35.971-70.42313.736--19.920-58.140-

Stockist of A4-80 Nuts and Washers With Passivated, Plain, and Electropolished Finish as per ASME B16.5 Standard at Reasonable Price

A4-80 Nuts And Washers Surface Finishes

Category
Protective Finishes
Plain / Self-Colour -as manufactured, matte-grey Passivated -ASTM A967, removes free iron Black Passivated -dark oxide, low-reflective
Category
Decorative Finishes
Bright Polished -mechanically polished, high shine Electropolished -mirror finish, ultra-low roughness Satin / Brushed -directional grain, low-glare
ISO Certified Exporter of SS A4-80 Screws and Washers in Various Dimension

Countries We Export A4-80 Bolts To

Region

North & South America

USAUSA CanadaCanada MexicoMexico BrazilBrazil
Region

Europe

UKUK SpainSpain PolandPoland NetherlandsNetherlands GermanyGermany ItalyItaly IrelandIreland DenmarkDenmark
Region

Middle East

UAEUAE Saudi ArabiaSaudi Arabia QatarQatar TurkeyTurkey DohaDoha DammamDammam RiyadhRiyadh Abu DhabiAbu Dhabi Al JubailAl Jubail Al KhobarAl Khobar
Region

Africa

South AfricaSouth Africa NigeriaNigeria
Region

Asia Pacific

IndiaIndia SingaporeSingapore AustraliaAustralia

A4-80 Bolt Client References

Marine Fabrication

Al Fajer Marine Contracting

  • Dock structural assembly project
  • A4-80 Stud Bolts, M16 x 100mm
  • Fully threaded rod design
UAE
Petrochemical Plant

Riyadh Petrochemical Complex

  • Petrochemical piping installation
  • A4-80 Socket Cap Bolts, M20 x 80mm
  • Allen key drive head
Saudi Arabia
Food-Grade Equipment

Rotterdam Food Processing Co.

  • Food-grade equipment assembly
  • A4-80 Hex Bolts, M8 x 40mm
  • Corrosion-resistant finish
Netherlands
Coastal Construction

Marina Bay Construction Pte Ltd

  • High-rise coastal cladding
  • A4-80 Carriage Bolts, M14 x 70mm
  • Square neck anti-turn shank
Singapore
Buyer Verification

A4-80 Bolt Head Markings and Identification

"A4" Grade Stamp
  • Confirms 316 austenitic stainless steel
  • Marked on bolt head
"80" Property Class Mark
  • Confirms minimum 800 N/mm² tensile class
  • Stamped next to grade mark
Manufacturer's Trademark
  • Traceable to a certified, audited mill
  • Required for MTC traceability
Batch / Lot Code
  • Links bolt to its test certificate
  • Cross-checked with MTC 3.1 / 3.2

A4-80 Bolt FAQs

01What material is an A4-80 bolt made from?
  • Made from AISI 316 austenitic stainless steel
  • Strong resistance to chlorides & marine salts
02What does "80" mean in A4-80?
  • Denotes property class 80 (ISO 3506-1)
  • Minimum tensile strength: 800 N/mm²
03Is A4-80 stronger than A2-70?
  • Higher tensile & proof stress values
  • Better suited to marine, high-load duty
04What sizes does Manifest Alloys supply?
  • Sizes from M3 up to M64
  • Standard & drawing-based custom lengths
05How fast can custom A4-80 sizes ship?
  • Typically 15–20 days from drawing approval
06Can A4-80 bolts be reused after removal?
  • Only if threads and coating remain undamaged