Stainless Steel 317 Fasteners Characteristics
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, ADNOC • GST, IEC & MSME
Clientele
100+ clients • India & export markets
Export Reach
19+ countries • GCC, Africa & APAC
Testing Offered
Mechanical, chemical & PMI • MTC EN 10204 3.1 & 3.2
Shipment Documents
Invoice, Packing List • COO, COI, MTC, BL & Lab Report
Table of Content
Pre-Machined SS 317L Bolts and Screws Manufacturer in India With 100% PMI Spectro Test
Specifiers reach for Type 317 when 316 has already been tried and the bolting still came back pitted. The extra molybdenum, 3.00–4.00% against 2.00–3.00% in 316, is what buys that margin, and it is the reason scrubber, bleach-plant and seawater-adjacent drawings in South Africa, the UAE, Kenya and Canada land on our desk asking specifically for 317L rather than a cheaper substitute.
We machine those fasteners ourselves in Mumbai from ASTM A276 and A479 bar, so the heat number on your certificate is the heat number we cut. Every lot is spectro checked by PMI before packing, passivated to ASTM A967 and boxed for long-haul freight, and because we quote from the shop floor rather than a trading desk you get the price, the lead time and a straight technical answer in the same reply.
Stainless Steel 317 Fasteners Specification
Certification, testing and compliance detail behind every Stainless Steel 317 Fasteners consignment we release from Mumbai.
SS 317 Bolts Corrosion Acceptance
- Heats selected to calculated PREN ≥ 29
- PREN reported on the certificate on request
UNS S31703 Intergranular Corrosion Test
- ASTM A262 Practice E on request
- Sensitised or as-supplied condition testing
SS 317L Delivery Condition & Passivation
- Solution annealed, pickled, free of scale
- Nitric or citric passivation to ASTM A967
AISI 317 Threaded Rod Third-Party Inspection
- SGS, Bureau Veritas, TUV or Lloyd’s witness
- Stage inspection and release note supported
Buyer-Geography Compliance Support
- Kenya KEBS PVoC and Saudi SABER files
- EU CBAM data provided with the invoice
317 Stainless Steel Hex Nut Traceability
- Heat number and grade marked on the head
- Laser marking and bag-level tagging optional
Stainless Steel 317 Fasteners Manufacturer In Mumbai – Machining In-House Since 2012
Send the drawing, thread class and quantity and our CNC cell prices ex-stock and mill-order options the same working day.
SS 317 Bolts Size & Thread Chart
| Metric Size | Coarse Pitch (mm) | Inch Size | UNC (TPI) |
|---|---|---|---|
| M3 | 0.50 | 1/4″ | 20 |
| M4 | 0.70 | 5/16″ | 18 |
| M5 | 0.80 | 3/8″ | 16 |
| M6 | 1.00 | 7/16″ | 14 |
| M8 | 1.25 | 1/2″ | 13 |
| M10 | 1.50 | 5/8″ | 11 |
| M12 | 1.75 | 3/4″ | 10 |
| M16 | 2.00 | 7/8″ | 9 |
| M20 | 2.50 | 1″ | 8 |
| M24 | 3.00 | 1-1/8″ | 7 |
| M30 | 3.50 | 1-1/4″ | 7 |
| M36 | 4.00 | 1-3/8″ | 6 |
| M42 | 4.50 | 1-1/2″ | 6 |
| M48 | 5.00 | 1-3/4″ | 5 |
| M56 | 5.50 | 2″ | 4.5 |
| M64 | 6.00 | Above 2″ | To order |
What Decides Your SS 317L Size Callout
Need A Dimensioned 317L Drawing?
Share the size, thread class, length, drive type and quantity, and we return a dimensioned sketch with the quotation so your fitters can check clearance and grip length before the order is released.
Request Size ChartBuy Passivated Finish UNS S31700 Studs and Threaded Rod Ready in Mumbai Stock With PREN > 29
Stainless Steel 317L Fasteners Types
A working Stainless Steel 317 fasteners supplier in India carrying every common head, drive and thread form in ready stock.
Stainless Steel 317 Hex Bolt
ASTM F593 Group 2 • M3–M64- Rolled thread for a stronger root radius
- Heavy hex head available for flanged joints
UNS S31700 Hex Nut
ASTM F594 Group 2 • M3–M64- Proof load matched to the mating 317L bolt
- Heavy hex, thin and nylon-insert versions
SS 317L Stud Bolt & Threaded Rod
AISI 317 Threaded Rod • Cut To Length- Continuous or double-end thread, chamfered
- Supplied with two heavy hex nuts as a set
WNR 1.4449 Flat & Spring Washer
DIN 125 / DIN 127 • SUS 317 Washers- Spreads bearing load on soft gasket faces
- Non-standard OD and thickness punched to order
UNS S31703 Socket Head Cap Screw
DIN 912 • M3–M36- Compact head for crowded bolt circles
- Button and countersunk socket heads stocked
SS 317L U Bolts
Pipe Clamp Duty • Bent To Radius- Formed to your pipe OD, round or square bend
- Supplied with saddle plate and nut set
INOX 317 Machine & CSK Screw
DIN 963 / DIN 965 • M3–M20- Flush seating on lined and clad panels
- Slotted, Phillips and Pozi drives available
SS 317 Dowel Pin & Rivet
DIN 6325 • Ground Finish- Locates mating parts before bolts are torqued
- Solid rivets cold-formed from the same bar
UNS S31700 Screws Governing Manufacturing Standards
Bar stock, threading, finishing and testing are each governed by a named specification, checked before release.
WNR 1.4449 Studs Chemical Composition
Composition limits below are the ASTM A240 ranges for UNS S31700 and UNS S31703, the two grades differ only in the carbon ceiling.
AISI 317 Threaded Rod Mechanical Properties
Minimum values for solution annealed UNS S31700 and S31703 to ASTM A240, both grades share the same acceptance limits.
SUS 317 Washers Material Equivalent Grades
Cross-reference for buyers working from a European, Japanese or British callout rather than the UNS number.
ASTM / AISI (USA)
- UNS S31700 (Type 317)
- UNS S31703 (Type 317L)
- ASTM A276 / A479 (Bar)
- ASTM F593 & F594 Group 2
DIN / WNr (Germany)
- Werkstoff 1.4449 (317)
- Werkstoff 1.4438 (317L)
- DIN 931 / 933 / 934 Forms
EN (Europe)
- X3CrNiMo17-13-3 (1.4449)
- X2CrNiMo18-15-4 (1.4438)
- EN 10088-3 (Bar)
JIS (Japan)
- SUS 317
- SUS 317L
- JIS G4303 (Bar)
BS (United Kingdom)
- BS 317S16 (317)
- BS 317S12 (317L)
- Now follows EN 10088-3
Manufactured In (India)
- Mumbai machining & threading
- Indian and European melt sources
- Certificate of Origin on request
INOX 317 Nuts PREN Value & Chloride Pitting Resistance
PREN is calculated as %Cr + 3.3 × %Mo + 16 × %N. The bars below use typical mill chemistry, so the exact figure moves with the heat.
Reading The Number Honestly
Where The Extra Molybdenum Earns Its Cost
Higher PREN raises the critical pitting temperature in chloride-bearing water, which is why 317L bolting outlasts 316L in flue-gas scrubbers, bleach plants, brine-handling lines and coastal plant rooms. It is not a substitute for duplex or 904L in strongly reducing acids, and we will say so if your service data points that way.
Check My Service ConditionSS 317L vs SS 316L vs SS 904L Fastener Selection
The three grades buyers weigh against each other most often, set side by side without the sales gloss.
SS 316L (S31603)
- Chromium: 16.00–18.00%
- Molybdenum: 2.00–3.00%
- Typical PREN: Mid twenties
- Best For: General marine and process bolting
- Relative Cost: Lowest of the three
SS 317L (S31703)
- Chromium: 18.00–20.00%
- Molybdenum: 3.00–4.00%
- Typical PREN: Low thirties
- Best For: Scrubbers, bleach plants, brine duty
- Relative Cost: Middle, best value per PREN point
SS 904L (N08904)
- Chromium: 19.00–23.00%
- Molybdenum: 4.00–5.00%
- Typical PREN: Mid thirties
- Best For: Sulphuric and phosphoric acid service
- Relative Cost: Highest, high nickel and copper
UNS S31700 Screws Exporter In India To Jebel Ali, UAE
Full container and LCL loads for Jebel Ali and Dammam leave with legalised origin papers already attached.
317 Stainless Steel Hex Nut Export Compliance & Document Pack
Clearance delays cost more than freight. Here is the paperwork we prepare by destination before the container is sealed.
Africa – Kenya, South Africa, Uganda
- Kenya: KEBS PVoC file, CoC via appointed agency
- South Africa: SARS entry set, SANS reference on request
- Origin: Chamber-attested Certificate of Origin
- Quality: EN 10204 3.1 MTC with heat traceability
- Ports: Mombasa, Durban, Cape Town, Dar es Salaam
Gulf – UAE, Saudi Arabia
- UAE: Conformity file where the scheme applies
- Saudi Arabia: SABER registration and SASO CoC
- Origin: Legalised COO for consular clearance
- Quality: Third-party witness report on request
- Ports: Jebel Ali, Khalifa, Dammam, Jeddah
Europe & North America
- EU: CBAM emissions data supplied with the invoice
- UK: EN 10204 3.1 or 3.2 to buyer instruction
- Canada & USA: Commercial invoice, COO, HS 7318
- Packing: ISPM 15 heat-treated wooden crates
- Ports: Rotterdam, Antwerp, Montreal, Houston
SS 317L U Bolts Galling Control & Assembly Practice
Austenitic stainless seizes on itself when the oxide film breaks down under load. These four controls stop a nut welding itself to a stud on site.
Roll, Do Not Cut
Rolled threads leave a smoother, work-hardened flank that resists cold welding far better than a cut thread.
Mix The Hardness
Pair a cold-worked 317L stud with a slightly softer nut, or a different austenitic grade, so both flanks never gall together.
Lubricate Every Joint
A nickel or moly anti-seize on the thread and nut face cuts friction and keeps torque translating into real clamp load.
Slow The Run-Down
Start square by hand, keep spinning speed low and stop impact wrenches; heat from a fast run-down is what triggers seizure.
UNS S31703 Socket Head Cap Screw Applications
Industries consistently reorder 317L bolting from us, a trusted Stainless Steel 317 Fasteners exporter.
SS 317 Bolts Passivation Finish & Export Packing
Free iron picked up during machining is removed before packing, so the surface arrives as clean as it left the lathe.
Where Our Stainless Steel 317 Fasteners Ship
Ex-stock and mill-order dispatch to buyers across the Gulf, Africa, the Americas and Asia-Pacific, alongside strong domestic demand from Mumbai, Ahmedabad, Bengaluru, Chennai and Pune.
UAE
Turkey
CanadaUnited Kingdom
Saudi Arabia
SingaporeUnited States
Mexico
Thailand
Italy
NetherlandsGermany
Philippines
Malaysia
Uganda
Indonesia
South Africa
Vietnam
VenezuelaASTM F593 Group 2 Fastener Supplier In Chennai – PMI Verified Before Dispatch
Chennai and Tamil Nadu plants draw from the same spectro-checked 317L lots that go into our export containers.
Stainless Steel 317L Fasteners Delivery Estimate
Booking happens the week your order is confirmed, the freight mode you pick is what sets the arrival date.
Ex-Stock Dispatch
Stocked 317L sizes are packed and handed to the transporter inside 2–5 working days
Sea Freight
The economical route for volume orders, running roughly 1–4 weeks port to port
Air Freight
Kept for breakdown and turnaround needs, landing in about 3–7 days
Country-Specific ETA
Send us the discharge port and we commit to a dated arrival schedule
UNS S31700 Screws Testing & Certification
Whatever you nominate at order stage is carried out and printed on the certificate that travels with the box.
Stainless Steel 317 Fasteners FAQs
The questions our technical desk answers most often, from a direct Stainless Steel 317 fasteners manufacturer in India.
What is SS 317 Bolts material?
SS 317 Bolts are austenitic Cr-Ni-Mo steel with better pitting resistance than 316.
What is the difference between UNS S31700 Screws and 316 stainless?
UNS S31700 Screws carry higher molybdenum and chromium, giving a higher PREN for seawater duty.
Is Stainless Steel 317L Fasteners better than straight 317?
Stainless Steel 317L Fasteners have lower carbon, safer for welding; straight 317 suits high-temperature strength needs.
Can AISI 317 Threaded Rod be welded?
Yes, using ER317L or E317L consumables; heavier sections may need post-weld annealing.
Is 317 Stainless Steel Hex Nut magnetic?
Essentially non-magnetic when annealed; cold working can cause weak surface magnetism.
Can you supply SS 317L U Bolts to ASTM A193?
A193 excludes 317, so we manufacture to ASTM F593/F594 with A193 testing requirements.
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