- Call Us+91 9819454781
- Email Usinquiry@kkfasteners.com
- WhatsApp+91 9819454781
Stainless Steel 317/317L Screws are high-performance austenitic fasteners designed for environments where standard stainless steels like 304 and 316 begin to fail due to aggressive chemical exposure or chloride-rich conditions. Manufactured with increased molybdenum content, these screws provide superior resistance to pitting, crevice corrosion, and general chemical attack, making them essential for marine engineering, chemical processing plants, and offshore oil & gas installations.
These fasteners comply with widely accepted international standards such as ASTM A193, ASTM A194, DIN 933, DIN 912, and ISO 4017, ensuring dimensional precision and mechanical reliability across global engineering systems. The addition of low-carbon 317L improves weldability and reduces carbide precipitation risks, especially in high-temperature applications.
In industrial procurement cycles, Stainless Steel 317/317L Screws are selected when long-term durability under corrosive stress is more critical than initial material cost. KK Fasteners supplies these fasteners to engineering contractors and OEMs across global markets with full material traceability and controlled production processes aligned with international quality standards.
| Parameter | Details |
|---|---|
| Material Grades | SS 317, SS 317L (Austenitic Stainless Steel) |
| Standards | DIN 933, DIN 912, ISO 4017, ASTM A193, ASTM A194 |
| Size Range | M3 to M64 / 1/8" to 2.5" |
| Thread Type | Metric Coarse, Metric Fine, UNC, UNF |
| Surface Finish | Bright, Passivated, Polished, Black Oxide (custom) |
| Tensile Strength | 515 – 620 MPa (Annealed Condition) |
| Hardness | Max 95 HRB |
| Type Variants | Hex Head, Socket Head Cap Screw, Set Screws, Machine Screws |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 317 SS Screw | Min | - | - | - | 0 | - | 16.0 | 2.00 | 10.0 | - |
| Max | 0.08 | 2.0 | 0.75 | 0.045 | 0.03 | 18.0 | 3.00 | 14.0 | 0.10 | |
| SS 317L Screw | Min | - | - | - | - | - | 16.0 | 2.00 | 10.0 | - |
| Max | 0.03 | 2.0 | 0.75 | 0.045 | 0.03 | 18.0 | 3.00 | 14.0 | 0.10 |
| Grade | Tensile Str (MPa) min |
Yield Str 0.2% Proof (MPa) min |
Elong (% in 50mm) min |
Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 317 | 515 | 205 | 40 | 95 | 217 |
| 317L | 485 | 170 | 40 | 95 | 217 |
| Grade | Elastic Modulus (GPa) |
Density (kg/m3) |
Mean Co-eff of Thermal Expansion (µm/m/°C) |
Thermal Conductivity of Screws (W/m.K) |
Elec Resistivity (nΩ.m) |
Specific Heat 0-100°C (J/kg.K) |
|||
| 0-100°C | 0-315°C | 0-538°C | At 100°C | At 500°C | |||||
| 317/317L Screws | 193 | 8000 | 15.9 | 16.2 | 17.5 | 16.3 | 21.5 | 740 | 500 |
Flat Head Machine Screws
| Nominal Size | A | H | J | T | M | G | N | Phillips Driver Size | |||||
| Head Diameter | Height of Head | Width of Slot | Depth of Slot | Dimensions of Recess | |||||||||
| Diameter | Depth | Width | |||||||||||
| Max. | Min. | Max. | Min. | Max. | Min. | Max. | Min. | Max. | Min. | Max. | Min. | ||
| 2 4 5 6 7* 8 9* 10 12 14* 1/4 5/16 3/8 1/2 | .172 .225 .252 .279 .305 .332 .358 .385 .438 .491 .507 .635 .762 .875 | 147 .195 .220 .244 .268 .292 .316 .340 .389 .437 .452 .568 .685 775 | .051 .067 .075 .083 .091 .100 .108 .116 .132 .148 .153 .191 .230 .223 | .040 .055 .062 .069 .076 .084 .091 .098 .112 .127 .131 .165 .200 .198 | .031 .039 .043 .048 .048 .054 .054 .060 .067 .075 .075 .084 .094 .106 | .023 .031 .035 .039 .039 .045 .045 .050 .056 .064 .064 .072 .081 .091 | .023 .030 .034 .038 .041 .045 .049 .053 .060 .068 .070 .088 .106 .103 | .015 .020 .022 .024 .027 .029 .032 .034 .039 .044 .046 .058 .070 .065 | .102 .128 .154 .174 .182 .189 .258 .204 .268 .283 .283 .365 .393 .424 | .089 .115 .141 .161 .169 .176 .245 .191 .255 .270 .270 .352 .380 .411 | .063 .089 .086 .106 .114 .121 .146 .136 .156 .171 .171 .216 .245 .276 | .017 .018 .027 .029 .030 .031 .034 .032 .036 .039 .035 .061 .065 .069 | 1 1 2 2 2 2 2 2-3* 3 3 3 4 4 4 |
| Nominal Size | A | W | H | F | U | J | T | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Width Across Flats | Width Across Corners | Height of Head | Diameter of Washer | Thickness of Washer | Width of Slot | Depth of Slot | |||||||
| Max. | Min. | Min. | Max. | Min. | Max. | Min. | Max. | Min. | Max. | Min. | Max. | Min. | |
| 4 6 7 8 10 12 14 1/4 5/16 3/8 | .187 .250 .250 .250 .312 .312 .438 .375 .500 .562 | .181 .244 .244 .244 .305 .305 .428 .367 .489 .551 | .202 .272 .272 .272 .340 .340 .409 .409 .545 .614 | .060 .093 .093 .110 .120 .155 .190 .190 .230 .295 | .049 .080 .080 .096 .105 .139 .172 .172 .208 .270 | .243 .328 .328 .348 .414 .432 .520 .520 .676 .780 | .225 .302 .302 .322 .384 .398 .480 .480 .624 .720 | .019 .025 .029 .031 .031 .039 .050 .050 .055 .063 | .011 .015 .017 .019 .019 .022 .030 .030 .035 .037 | .039 .048 .048 .054 .060 .067 .075 .075 .084 .094 | .031 .039 .039 .045 .050 .056 .064 .064 .072 .081 | .042 .053 .062 .074 .080 .103 .111 .111 .134 .168 | .025 .033 .040 .052 .057 .077 .083 .083 100 .131 |
|
Nominal
|
Thread.
|
Hex Socket Size
|
Body diameter and Head height
|
Head Dia
|
Soc. length
|
||
|
Size
|
Pitch
|
Max
|
Min
|
Max
|
Min
|
||
|
J
|
D /H
|
A
|
K
|
||||
|
M3
|
0.5
|
2.50
|
3.00
|
2.86
|
5.50
|
5.20
|
1.3
|
|
M4
|
0.70
|
3.00
|
4.00
|
3.82
|
7.00
|
6.64
|
2.00
|
|
M5
|
0.8
|
4.00
|
5.00
|
4.82
|
8.50
|
8.14
|
2.70
|
|
M6
|
1.0
|
5.00
|
6.00
|
5.82
|
10.00
|
9.64
|
3.30
|
|
M8
|
1.25
|
6.00
|
8.00
|
7.78
|
13.00
|
12.57
|
4.3
|
|
M10
|
1.5
|
8.00
|
10.00
|
9.78
|
16.00
|
15.57
|
5.50
|
|
M12
|
1.75
|
10.00
|
12.00
|
11.73
|
18.00
|
17.57
|
6.60
|
|
M16
|
2.0
|
14.00
|
16.00
|
15.73
|
24.00
|
23.48
|
8.80
|
|
M20
|
2.5
|
17.00
|
20.00
|
19.67
|
30.00
|
29.48
|
10.70
|
|
M24
|
3.0
|
19.00
|
24.00
|
23.67
|
36.00
|
35.38
|
12.90
|
Stainless Steel 317/317L Screws are used in systems where exposure to aggressive chemicals, saltwater, or acidic media demands long-term fastener reliability. Their application spans critical industrial infrastructure and precision equipment assemblies.
Stainless Steel 317/317L Screws are manufactured using precision cold forging and CNC machining processes to maintain tight dimensional accuracy and consistent mechanical performance. Each batch undergoes controlled heat treatment to stabilize austenitic structure and achieve required tensile strength.
Quality inspection includes dimensional verification, hardness testing, thread gauging, and surface passivation checks to ensure corrosion resistance. Lot traceability is maintained from raw material sourcing to final dispatch.
At KK Fasteners, every production lot is aligned with ISO 9001 quality management systems, ensuring consistency across export shipments and critical industrial orders. Additional compliance with RoHS and REACH standards supports global regulatory acceptance.
Explore our comprehensive range of products, ensuring you find the perfect solution for your specific requirements.
Save money without compromising on quality, thanks to our competitive prices and cost-effective options.
Personalized assistance, prompt responses, and a commitment to meeting your needs, making your purchase process seamless.
Stainless Steel 317/317L Screws are high-performance austenitic fasteners designed for highly corrosive environments. They contain higher molybdenum content than standard stainless steel grades, offering superior resistance to pitting, crevice corrosion, and chemical attack. These screws are widely used in marine, chemical processing, oil & gas, and desalination industries where long-term durability is critical.
Yes, SS 317L generally offers better corrosion resistance than SS 316 due to its increased molybdenum content. This improvement enhances performance in chloride-rich environments such as seawater, chemical tanks, and offshore equipment. It is especially preferred in applications where extended service life and reduced maintenance are important.
Stainless Steel 317 screws are commonly manufactured in compliance with international standards such as ASTM A193, ASTM A194, DIN 933, DIN 912, and ISO 4017. These standards ensure consistent mechanical properties, dimensional accuracy, and compatibility across global industrial applications.
These screws are used in marine engineering, chemical processing plants, oil refineries, pharmaceutical manufacturing equipment, and desalination systems. They are selected for applications involving aggressive chemicals, high humidity, or saltwater exposure where standard fasteners may fail prematurely.
A reliable supplier should provide material traceability, ISO-certified quality systems, and compliance with global standards like ASTM and DIN. It is also important to evaluate export experience, testing reports, and customization capability. Suppliers like KK Fasteners support international procurement with documented quality assurance and consistent supply chains.
Stainless Steel 317/317L Screws are critical components for industries operating in chemically aggressive and marine environments where failure is not an option. With controlled manufacturing, full traceability, and international compliance standards, KK Fasteners supports global procurement teams with reliable supply and engineering-grade fastener solutions.
For technical specifications, bulk pricing, or custom requirements, connect with the engineering team to request a detailed quotation or product datasheet.
