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Stainless Steel 317/317L Nuts are high-performance fastening components designed for extreme corrosion environments where standard stainless steel grades fail. Manufactured using molybdenum-enriched austenitic stainless steel, these nuts provide superior resistance to pitting, crevice corrosion, and chemical attack in aggressive media such as chlorides, acids, and seawater exposure. They are widely used in chemical processing plants, marine engineering systems, pharmaceutical equipment, and offshore oil & gas installations where long-term mechanical integrity is critical.
These nuts conform to international standards such as ASTM A194, DIN 934, and ISO metric threading systems, ensuring global compatibility across engineered assemblies. As a precision-focused manufacturer, KK Fasteners supplies SS 317/317L nuts engineered for dimensional accuracy, consistent mechanical performance, and full traceability across industrial supply chains worldwide.
| Parameter | Specification |
|---|---|
| Material Grades | Stainless Steel 317 / 317L (Austenitic, Molybdenum-bearing) |
| Standards | ASTM A194, DIN 934, ISO 4032, BS 3692 |
| Size Range | M3 to M100 / 1/8” to 4” |
| Thread Types | Metric (Coarse & Fine), UNC, UNF |
| Types Available | Hex Nuts, Heavy Hex Nuts, Lock Nuts, Square Nuts |
| Hardness | Up to 200 HB (depending on condition and processing) |
| Tensile Strength | As per ASTM A194 Grade 317/317L requirements |
| Surface Finish | Plain, Passivated, Polished, PTFE Coated |
| Corrosion Resistance | High resistance to chlorides, acids, and seawater environments |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | Fe |
| SS 317 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 18.00 - 20.00 | 3.00 - 4.00 | 11.00 - 15.00 | 57.845 min |
| SS 317L | 0.035 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 18.00 - 20.00 | 3.00 - 4.00 | 11.00 - 15.00 | 57.89 min |
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
|---|---|---|---|---|
| 7.9 g/cm3 | 1400 °C (2550 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
| STANDARD | DIN | UNS | JIS | EN |
| SS 317 | 1.4449 | S31700 | SUS 317 | X5CrNiMo1713 |
| SS 317L | 1.4438 | S31703 | SUS 317L | X2CrNiMo18-15-4 |
All measurements in millimeters
Nominal Size or Basic Major Thread Diameter |
F |
G |
H |
||||||
Width Across Flats |
Width Across Corners |
Thickness |
|||||||
Basic |
Max |
Min |
Max |
Min |
Basic |
Max |
Min |
||
1/4 |
.2500 |
1/2 |
.500 |
.488 |
.577 |
.556 |
15/64 |
.250 |
.218 |
5/16 |
.3125 |
9/16 |
.562 |
.546 |
.650 |
.622 |
19/64 |
.314 |
.280 |
3/8 |
.3750 |
11/16 |
.688 |
.669 |
.794 |
.763 |
23/64 |
.377 |
.341 |
7/16 |
.4375 |
3/4 |
.750 |
.728 |
.866 |
.830 |
27/64 |
.441 |
.403 |
1/2 |
.5000 |
7/8 |
.875 |
.850 |
1.010 |
.969 |
31/64 |
.504 |
.464 |
9/16 |
.5625 |
15/16 |
.938 |
.909 |
1.083 |
1.037 |
35/64 |
.568 |
.526 |
5/8 |
.6250 |
1-1/16 |
1.062 |
1.031 |
1.227 |
1.175 |
39/64 |
.631 |
.587 |
3/4 |
.7500 |
1-1/4 |
1.250 |
1.212 |
1.443 |
1.382 |
47/64 |
.758 |
.710 |
7/8 |
.8750 |
1-7/16 |
1.438 |
1.394 |
1.660 |
1.589 |
55/64 |
.885 |
.833 |
1 |
1.0000 |
1-5/8 |
1.325 |
1.575 |
1.876 |
1.796 |
63/64 |
1.012 |
.956 |
1-1/8 |
1.1250 |
1-13/16 |
1.812 |
1.756 |
2.093 |
2.002 |
1-7/64 |
1.139 |
1.079 |
1-1/4 |
1.2500 |
2 |
2.000 |
1.938 |
2.309 |
2.209 |
1-7/32 |
1.251 |
1.187 |
1-3/8 |
1.3750 |
2-3/16 |
2.188 |
2.119 |
2.526 |
2.416 |
1-11/32 |
1.378 |
1.460 |
1-1/2 |
1.5000 |
2-3/8 |
2.375 |
2.300 |
2.742 |
2.622 |
1-15/32 |
1.505 |
1.433 |
1-5/8 |
1.6250 |
2-9/16 |
2.562 |
2.481 |
2.959 |
2.828 |
1-19/32 |
1.632 |
1.556 |
1-3/4 |
1.7500 |
2-3/4 |
2.750 |
2.662 |
3.175 |
3.035 |
1-23/32 |
1.759 |
1.679 |
2 |
2.0000 |
3-1/8 |
3.125 |
3.025 |
3.608 |
3.449 |
1-31/32 |
2.013 |
1.925 |
2-1/4 |
2.2500 |
3-1/2 |
3.500 |
3.388 |
4.041 |
3.862 |
2-13/64 |
2.251 |
2.155 |
2-1/2 |
2.5000 |
3-7/8 |
3.875 |
3.750 |
4.474 |
4.275 |
2-29/64 |
2.505 |
2.401 |
2-3/4 |
2.7500 |
4-1/4 |
4.250 |
4.112 |
4.907 |
4.688 |
2-45/64 |
2.759 |
2.647 |
3 |
3.0000 |
4-5/8 |
4.625 |
4.475 |
5.340 |
5.102 |
2-61/64 |
3.013 |
2.893 |
3-1/4 |
3.2500 |
5 |
5.000 |
4.838 |
5.774 |
5.515 |
3-3/16 |
3.252 |
3.124 |
3-1/2 |
3.5000 |
5-3/8 |
5.375 |
5.200 |
6.207 |
5.928 |
3-7/16 |
3.506 |
3.370 |
3-3/4 |
3.7500 |
5-3/4 |
5.750 |
5.562 |
6.640 |
6.341 |
3-11/16 |
3.670 |
3.616 |
4 |
4.0000 |
6-1/8 |
6.125 |
5.925 |
7.073 |
6.755 |
3-15/16 |
4.014 |
3.862 |
Stainless Steel 317/317L Nuts are used in industries where standard stainless steel fasteners are insufficient due to aggressive environmental exposure or chemical contact.
Stainless Steel 317/317L Nuts are manufactured using precision cold forging techniques, followed by controlled threading and heat treatment processes to achieve optimal mechanical properties. Each batch undergoes strict dimensional verification and surface integrity inspection to ensure compliance with international fastener standards.
Quality assurance includes hardness testing, thread gauge inspection, and corrosion resistance validation through controlled passivation processes. Every production lot is traceable through material heat numbers and certification records. KK Fasteners integrates ISO 9001-based quality systems to ensure consistency, reliability, and global export readiness for every shipment.
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Stainless Steel 317/317L Nuts are high-corrosion-resistant fasteners made from molybdenum-alloyed austenitic stainless steel. They are designed for use in aggressive environments such as chemical processing, marine systems, and offshore equipment where standard stainless steel grades may fail due to pitting or crevice corrosion.
SS 317 contains standard carbon content, while SS 317L has lower carbon levels. The reduced carbon in 317L improves weldability and reduces the risk of carbide precipitation, making it more suitable for welded structures and highly corrosive environments.
These nuts are manufactured in compliance with international standards such as ASTM A194, DIN 934, ISO 4032, and BS 3692. These standards ensure compatibility with global fastening systems used in engineering and industrial applications.
They are widely used in chemical plants, marine engineering, offshore platforms, pharmaceutical equipment, heat exchangers, and water treatment systems. Their high resistance to acids, chlorides, and seawater makes them ideal for demanding environments.
Look for suppliers with ISO certification, material traceability, adherence to ASTM/DIN standards, and strong quality testing processes. A reliable supplier should also provide test certificates, dimensional accuracy reports, and consistent global export support.
For industries operating in corrosive and high-performance environments, precision-engineered fastening reliability is essential. Stainless Steel 317/317L Nuts offer long-term stability under chemical and marine exposure conditions, backed by strict material control and engineering accuracy.
KK Fasteners provides application-driven fastening solutions with global export capability and full technical support. Share your requirements with our engineering team to receive a detailed quotation and material specification sheet tailored to your project.
