Stainless Steel 316L Fasteners

0 · at glance

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

PMI, mechanical & IGC test • MTC EN 10204 3.1 & 3.2

Shipment Documents

Invoice, Packing List • COO, COI, MTC, BL & Lab Report

Table of Content

Stainless Steel 316L Fasteners Specification Stainless Steel 316L Fasteners Size Chart 316L Stainless Steel Fasteners Types UNS S31603 Screws Chemical Composition SS 316L Bolts Mechanical Properties Stainless Steel 316L Fasteners Equivalent 304 vs 316 vs 316L Stainless Steel Bolts Carbon Limit & Weld Decay WNR 1.4404 Studs Chloride, PREN & Seawater Limits AISI 316L Threaded Rod Applications SS 316L Fasteners Machining Process 316L Fasteners For Mining, Water & Geothermal Plants 316l Stainless Steel Screws Sub-Zero & De-Icing Salt Duty AISI 316L Studs Surface Finish 316L Stainless Steel Hex Nut Testing & Certification SS 316L Bolts and Nuts Delivery Timeline Stainless Steel 316L Fasteners Price Factors

High-Purity SS 316L Bolts and Nuts Manufacturer in India With PREN ≥ 25

A welded 316 joint without re-annealing can fail within heat-affected zones. Therefore procurement teams in Dubai, Durban, Nairobi and Alberta specify 316L. Our Stainless Steel 316L fasteners limit carbon content to 0.030% maximum. This keeps chromium in solution and preserves grain-boundary corrosion resistance. Performance remains reliable after welding or repeated thermal cycling operations. Hex bolts, studs, screws, nuts and washers range from M3-M64. Ready stock at Mumbai works helps most enquiries convert quickly.

Most orders become dispatched cartons within the same week. Every lot ships with EN 10204 3.1 or 3.2 certification documentation. Heat numbers, PMI verification and hardness data remain recorded together. We manufacture and stock directly, eliminating trader margins between bar and orders. Technical answers come directly from people running threading and annealing lines.

01 · Specification

Stainless Steel 316L Fasteners Specification

Send your diameter, length, property class and quantity - pricing is confirmed the same working day from our Mumbai works.

SS 316L Bolts Dimensional & Head Standards

ISO 4014 / 4017, DIN 931 / 933
ISO 4032 nuts, ISO 4762 socket head

316l Stainless Steel Bolts Thread Tolerance Class

6g external, 6H internal to ISO 965
Class 2A / 2B on unified series

316l Stainless Steel Screws Sour Service Compliance

NACE MR0175 / ISO 15156-3 bolting
Annealed condition, hardness capped 22 HRC

SS 316L Nuts Passivation Standard

Nitric or citric passivation to ASTM A967
Descaling & cleaning to ASTM A380

AISI 316L Threaded Rod Head Marking & Traceability

Grade, property class & maker mark stamped
Heat number carried onto every carton label

SS 316L Nuts Export Packing Standard

VCI liner, poly drum or carton on pallet
ISPM-15 heat-treated seaworthy cases

UNS S31603 Fasteners Chemical Composition

Carbon capped 0.030% max for weld stability
Mo 2.0-3.0% to ASTM A193 B8M / A194 8M

316L Stainless Steel Stud Bolts Mechanical Property Class

A4-70 & A4-80 grades to ISO 3506-1
515 MPa tensile, 205 MPa yield minimum

SS 316L Hex Bolts Testing & Certification

EN 10204 3.1 / 3.2 mill test certificate
PMI, IGC to ASTM A262 Practice E, salt spray B117

Offer Acid Resistant UNS S31603 Screws and Studs Ready Stock With Seaworthy Export Packing & Shipping

02 · Range

Stainless Steel 316L Fasteners Size Chart

Coarse-pitch metric reference for Stainless Steel 316l Bolts And Nuts. Fine pitch, unified and BSW threads are cut to order.

Nominal Size	Coarse Pitch (mm)	Across Flats s (mm)	Height (mm)
Nominal Size	Coarse Pitch (mm)	Across Flats s (mm)	Hex Bolt Head k · ISO 4014	Hex Nut m · ISO 4032
M3	0.50	5.5	2.0	2.4
M4	0.70	7	2.8	3.2
M5	0.80	8	3.5	4.7
M6	1.00	10	4.0	5.2
M8	1.25	13	5.3	6.8
M10	1.50	16	6.4	8.4
M12	1.75	18	7.5	10.8
M16	2.00	24	10.0	14.8
M20	2.50	30	12.5	18.0
M24	3.00	36	15.0	21.5
M30	3.50	46	18.7	25.6
M36	4.00	55	22.5	31.0
M42	4.50	65	26.0	34.0
M48	5.00	75	30.0	38.0
M56	5.50	85	35.0	45.0
M64	6.00	95	40.0	51.0

M3 to M64 Metric

1/4″ to 2-1/2″ Imperial

UNC & UNF Thread

BSW & BSF Thread

Metric Coarse & Fine

Cut-To-Length Threaded Rod

Stainless Steel 316L Fasteners Exporter In Mumbai Since 2012

Send your drawing and piece count - low-carbon 316L bolting is priced the same working day.

Request Quote Now

03 · Product Range

316L Stainless Steel Fasteners Types

Wee Keep ready stock of Stainless Steel 316l Bolts And Nuts, stud, screw, washer in Mumbai, ready for quick dispatch.

ASTM A193 Type 316L Hex Bolts

ISO 4014 / 4017 • M3-M64

Full and part thread held in ready stock
Head marked with grade and heat reference

WNR 1.4404 Studs

Continuous & Double-End • Cut To Length

Flange bolting sets matched with nuts
Chamfered ends for blind-hole entry

Stainless Steel 316L Socket Head Cap Screw

ISO 4762 • DIN 912

Hex key drive for tight equipment gaps
Cup, cone and dog point grub screws stocked

316L Stainless Steel Hex Nut

ISO 4032 / 4035 • M3-M64

Standard, thin jam and nyloc profiles
Proof load matched to the bolt property class

SUS 316L Washers

ISO 7089 • DIN 125 / 127

Plain, spring, fender and conical patterns
Sealing washers with bonded EPDM insert

316L Stainless Steel U Bolts

Pipe Clamp & Cable Tray Fixing

Bent to your pipe OD with matching saddle
Round or square bend profile available

ASTM A193 Grade 316L Rivet

Cladding & Sheet Fixing

Cold headed for even shear performance
Diameter and grip length made to order

ASTM A193 Gr 316L Dowel Pin

Precision Ground • Location Fit

Centreless ground to a tight diameter band
Plain, chamfered or pull-out threaded ends

04 · Composition

UNS S31603 Screws Chemical Composition

Chemical Composition - UNS S31603 (% by weight, per ASTM A276)

Cr16.00-18.00Chromium

Mo2.00-3.00Molybdenum

Ni10.00-14.00Nickel

C0.030 maxCarbon

Mn2.00 maxManganese

FeBalanceIron

Si1.00 maxSilicon

P0.045 maxPhosphorus

N0.10 maxNitrogen

S0.030 maxSulfur

05 · Strength Data

SS 316L Bolts Mechanical Properties

Solution Annealed Bar Stock - UNS S31603 (ASTM A276 / A479)

Tensile Strength485 MPa / 70 ksi min

Yield Strength (0.2%)170 MPa / 25 ksi min

Elongation In 50 mm30% min

Hardness217 HB max / 95 HRB max

Finished Bolting Property Classes - ISO 3506-1 Group A4 (d ≤ 39 mm)

A4-50 Soft / Annealed500 MPa Rm • 210 MPa Rp0.2

A4-70 Cold Worked700 MPa Rm • 450 MPa Rp0.2

A4-80 Strain Hardened800 MPa Rm • 600 MPa Rp0.2

Matching Nut ClassesISO 3506-2 A4-50 / 70 / 80

Physical Properties At 20 °C - Typical Values

Density8.00 g/cm³

Modulus Of Elasticity193 GPa

Melting Range1375-1400 °C

Thermal Expansion 0-100 °C15.9 µm/m·°C

06 · Cross-Reference

Stainless Steel 316L Fasteners Equivalent

Stainless Steel 316L Bolts and Nuts are available in equivalent grades meeting major international fastener standards.

ASTM / ASME (USA)

UNS S31603 / AISI 316L
ASTM A276 & A479 (Bar Stock)
ASTM A182 F316L (Forgings)
ASTM F593 / F594 Alloy Group 2

DIN / EN (Germany)

Werkstoff 1.4404
EN X2CrNiMo17-12-2
EN 10088-3

JIS (Japan)

SUS 316L
JIS G4303 (Bar)

BS (United Kingdom)

316S11 (Superseded BS 970)
Now BS EN 10088-3 grade 1.4404

GB (China)

022Cr17Ni12Mo2
Former designation 00Cr17Ni14Mo2

Common Trade Names

316L / INOX 316L / SS 316L
Mill trade names confirmed on request

07 · Grade Decision

304 vs 316 vs 316L Stainless Steel Bolts - Carbon Limit & Weld Decay

The key comparison points buyers check before placing a order, focused on the four factors that matter most.

Carbon Ceiling316L caps carbon at 0.030% against 0.08% for 316 and 304.

Sensitisation WindowLow carbon curbs chromium carbide forming in the 425-860 °C band.

Molybdenum Content2-3% Mo in 316L lifts chloride pitting resistance well past 304.

Strength Trade-OffAnnealed yield sits slightly under 316, recovered by cold working to A4-70.

Choose 316L when the joint is welded and cannot be re-annealed

Choose 316L for pharma, dairy and CIP wash-down duty

Choose 304 only where chlorides are absent and cost rules

Step up to duplex or 904L above 316L chloride limits

Need The Heat Number And PMI Reading Before You Release The PO?

Ask for the certificate first and we will send the lot paperwork ahead of despatch.

Request MTC Sample

08 · Chloride Duty

WNR 1.4404 Studs Chloride, PREN & Seawater Service Limits

The question our Dubai, Sharjah, Abu Dhabi and Dammam buyers ask before committing bolting to coastal plant.

PREN FormulaCalculated as %Cr plus 3.3 times %Mo plus 16 times %N.

Typical 316L PRENUsually lands between 24 and 26 on a commercial mill analysis.

PREN ≥ 25 Heat SelectionTell us your threshold and we screen the heat, then print the calculation on the MTC.

Where To Step UpWarm, aerated seawater and stagnant crevices call for duplex or 904L instead.

09 · Industries

AISI 316L Threaded Rod Applications

As a Stainless Steel 316L Fasteners Supplier in India, serving sectors that repeat-order 316L bolting from our Mumbai stock.

Pharmaceutical & Biotech Skids

Food, Dairy & Beverage Plant

Water & Effluent Treatment

Marine & Coastal Structures

Heat Exchangers & Pressure Vessels

Petrochemical & Refinery Piping

Solar Mounting & Wind Towers

Pulp, Paper & Bleaching Lines

10 · Machining

SS 316L Fasteners Machining Process

316L work hardens quickly and pulls long chips, so each stage below is set up specifically for low-carbon austenitic bar.

Bar Selection & PMIIncoming S31603 bar checked against mill certificate before cutting.

Bar CuttingBlanks parted to length with coolant-flooded circular saws.

Cold HeadingStandard diameters headed cold to keep grain flow through the head.

CNC Turning & MillingLow speed, heavy feed and sharp carbide to beat work hardening.

Thread RollingRolled where possible for a stronger, burnished thread root.

Solution AnnealingHeated then rapidly quenched to redissolve any carbide.

Pickling & PassivationFree iron removed so the passive chromium oxide film reforms.

Gauging & PackingThread ring and plug gauged, then VCI packed for the voyage.

SS 316L Bolts and Nuts Exporter In India To Jebel Ali And Dammam

Chloride-duty bolting containerised, sealed and cleared for Gulf delivery.

Request Export Quote

11 · African Plant Duty

316L Fasteners For Mining, Water & Geothermal Plants

Written for the enquiries that reach us from Johannesburg, Richards Bay, Nairobi and Naivasha.

Potable & Effluent Water WorksBolting for clarifier, penstock and dosing skid assemblies.

Geothermal Wellhead DutyStuds for separator and steam-gathering flanges at Rift Valley sites.

Mineral Processing FixingScreen deck, launder and thickener fasteners in mild acid wash.

East & Southern Africa RoutingConsolidated lots booked through Durban, Mombasa and Dar es Salaam.

12 · Cold Service

316L Stainless Steel Screws Sub-Zero & De-Icing Salt Duty

We serve as a Stainless Steel 316L Fasteners Manufacturer in India, offering fasteners with precise performance.

Face-centred cubic structure holds impact toughness below zero

No sharp ductile-to-brittle transition on cooling

Molybdenum content resists road-salt and brine spray

Charpy impact testing at your stated temperature on request

Non-magnetic in the annealed state for instrument enclosures

Moisture-barrier crating suited to frozen-yard storage

ASTM F594 Alloy Group 2 Supplier In Rotterdam With EN 10204 3.2 Documentation

Third-party witnessed nuts released only against a countersigned inspection report.

Get Supplier Quote

13 · Surface Treatments

AISI 316L Studs Surface Finish

As a Stainless Steel 316L Fasteners Manufacturer in Mumbai, we provide smooth, durable surface finishes.

Bright Turned

Pickled & Passivated

Electropolished

Bead Blasted Matt

PTFE Coated

Ceramic Filled PTFE Coated

Molybdenum Disulphide Coated

Silver Coated

Zinc Nickel Coated

Xylan Type Fluoropolymer

Why 316L GallsThe passive film tears under load and bare austenite cold welds.

Coated Thread FixPTFE or moly coating separates the mating flanks during run-down.

Site PracticeSlow, steady tightening beats fast impact driving on stainless.

Torque ValuesCoated friction factor shifts torque, so ask us before setting the wrench.

14 · Quality

316L Stainless Steel Hex Nut Testing & Certification

Selected against your inspection plan, then written onto one traceable certificate per heat and lot.

PMI Testing

Proof Load Test

Tensile & Yield Test

Hardness Test

Intergranular Corrosion Test (ASTM A262 Practice E)

Charpy Impact Test

Magnetic Permeability Check

Dye Penetrant

Thread Ring & Plug Gauging

MTC EN 10204 3.1 / 3.2

Third-Party Inspection

Heat & Lot Traceability

15 · Turnaround

SS 316L Bolts and Nuts Delivery Timeline

The clock starts the moment your purchase order and advance are received against our proforma invoice.

Ex-Stock Release

Stocked 316L bolting is picked, gauged and released in 2-4 working days

Sea Freight (FCL/LCL)

Best rate on drum and pallet volumes, roughly 12-28 days port to port

Air Freight

Line-stop shortages flown out against AWB in 3-5 days

Country-Specific ETA

Name your discharge port and we lock a confirmed arrival window

16 · Pricing

Stainless Steel 316L Fasteners Price Factors

Four variables move the per-piece or per-kg rate most - share yours for an accurate quote.

Nickel & Molybdenum SurchargeBase bar cost tracks the running nickel and moly index.

Diameter & LengthLarger studs carry more bar weight per piece.

Property ClassA4-80 strain-hardened bolting costs more than A4-50 annealed.

Testing & Coating LevelIGC testing, Charpy, witness inspection and PTFE coating each add a step.

17 · FAQs

Stainless Steel 316L Fasteners FAQs

Quick answers to the questions buyers ask us most before placing an order.

What is the price of Stainless Steel 316L fasteners per kg?

SS 316L fasteners price per kg depends on nickel-moly indices, size and testing - send sizes for a same-day quote.

What is the difference between SS 316 and SS 316L fasteners?

316L stainless steel bolts hold 0.030% max carbon vs 0.08% in SS 316, stopping intergranular corrosion at welds.

What is the equivalent grade of UNS S31603 fasteners?

UNS S31603 fasteners equal WNR 1.4404 (EN 10088-3), SUS 316L (JIS G4303) and 316S11 (BS 970).

Which standards apply to SS 316L bolts and nuts?

316L bolts and nuts follow ASTM F593 / F594 Group 2, ISO 3506 A4-70 / A4-80 and ASTM A193 B8M / A194 8M.

Do you export SS 316L fasteners to UAE, South Africa and Canada?

Yes, we export SS 316L fasteners from Mumbai to Jebel Ali, Dammam, Durban and Canadian ports with 3.1 MTCs.

Stainless Steel 316L Fasteners Product Overview