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Stainless Steel 317/317L Bolts are high-performance austenitic fasteners engineered for environments where corrosion resistance and mechanical integrity are critical. These bolts contain higher molybdenum content compared to standard stainless grades, making them suitable for aggressive chemical exposure, chloride-rich environments, and elevated temperature conditions. Commonly manufactured to standards such as ASTM A193, DIN, and ISO, they are widely used across chemical processing, marine engineering, and power generation industries.
Designed to maintain strength under thermal stress and resist pitting corrosion, Stainless Steel 317/317L Bolts are a preferred choice for critical assemblies where failure is not an option. KK Fasteners supplies these bolts with full material traceability and supports global delivery requirements for industrial projects across multiple sectors.
| Material | Stainless Steel 317, 317L |
| Grade | UNS S31700, UNS S31703 |
| Standards | ASTM A193 / A194, DIN 933, ISO 4017, BS 1083 |
| Size Range | M6 to M100 / 1/4" to 4" |
| Thread Type | Metric, UNC, UNF, BSW |
| Length | Up to 1000 mm |
| Finish | Plain, Passivated, PTFE Coated, Hot Dip Galvanized |
| Types | Hex Bolts, Heavy Hex Bolts, Stud Bolts, Anchor Bolts |
| Tensile Strength | 515 – 690 MPa |
| Hardness | Max 95 HRB |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 317/317L | min. | – | – | – | – | – | 18.0 | – | 11.0 | – |
| max. | 0.8 | 2.0 | 1.00 | 0.040 | 0.03 | 20.0 | 14.0 | – | ||
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 317/317L | 515 | 205 | 35 | 95 | 217 |
| Grade | Density (kg/m3) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (m/m/0C) | Thermal Conductivity (W/m.K) | Specific Heat 0-1000C (J/kg.K) | Electrical Resistivity (n.m) | |||
| 0-1000C | 0-3150C | 0-5380C | at 1000C | at 5000C | |||||
| 317/317L | 8000 | 193 | 17.2 | 17.8 | 18.4 | 16.2 | 21.5 | 500 | 720 |
All measurements in millimeters
NOMINAL SIZE (D) |
BODY DIAMETER |
HEAD THICKNEASTM A193 |
ACROASTM A193 THE FLATS |
ACROASTM A193 CORNERS |
||||
|---|---|---|---|---|---|---|---|---|
D (MAX) |
D (MIN) |
H (MAX) |
H (MIN) |
F (MAX) |
F (MIN) |
C (MAX) |
C (MIN) |
|
m10 |
10.00 |
9.78 |
6.63 |
6.17 |
17.00 |
15.73 |
18.48 |
17.77 |
m12 |
12.00 |
11.73 |
7.76 |
4.24 |
19.00 |
17.73 |
20.78 |
20.03 |
m14 |
14.00 |
13.73 |
9.09 |
8.51 |
22.00 |
20.67 |
24.25 |
23.35 |
m16 |
16.00 |
15.73 |
10.32 |
9.68 |
24.00 |
23.67 |
27.71 |
26.75 |
m20 |
20.00 |
19.67 |
12.88 |
12.12 |
30.00 |
29.16 |
34.64 |
32.95 |
m24 |
24.00 |
23.67 |
15.44 |
14.56 |
36.00 |
35.00 |
41.57 |
39.55 |
m30 |
30.00 |
29.67 |
19.48 |
17.92 |
46.00 |
45.00 |
53.12 |
50.85 |
m36 |
36.00 |
35.61 |
23.38 |
21.63 |
55.00 |
53.80 |
63.51 |
60.79 |
m42 |
42.00 |
41.38 |
26.97 |
25.03 |
65.00 |
62.90 |
75.06 |
71.71 |
m48 |
48.00 |
47.38 |
31.07 |
28.93 |
75.00 |
72.60 |
86.60 |
82.76 |
m56 |
56.00 |
55.26 |
36.2 |
33.80 |
85.00 |
82.20 |
98.15 |
93.71 |
m64 |
64.00 |
63.26 |
41.32 |
38.68 |
95.00 |
91.80 |
109.70 |
104.65 |
m72 |
72.00 |
71.26 |
46.45 |
43.55 |
105.00 |
101.40 |
121.24 |
115.60 |
m80 |
80.00 |
79.26 |
51.58 |
48.42 |
115.00 |
111.00 |
132.72 |
126.54 |
m90 |
90.00 |
89.13 |
57.74 |
54.26 |
130.00 |
125.50 |
150.11 |
143.07 |
m100 |
90.00 |
99.13 |
63.9 |
60.10 |
145.00 |
140.00 |
167.43 |
159.60 |
Stainless Steel 317/317L Bolts are used in industries requiring high corrosion resistance and temperature stability.
Production of Stainless Steel 317/317L Bolts typically involves cold forging for smaller diameters and hot forging for larger sizes, followed by CNC machining to achieve precise thread geometry. Heat treatment processes ensure optimal mechanical properties, while surface finishing enhances corrosion resistance.
KK Fasteners implements stringent quality control procedures, including dimensional inspection using calibrated gauges, tensile and hardness testing, and surface integrity checks. Each batch is traceable through heat numbers and complies with ISO 9001 quality management standards. Additional compliance with RoHS and REACH ensures suitability for global industrial applications.
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Stainless Steel 317/317L bolts are austenitic fasteners with high molybdenum content designed for superior corrosion resistance. They are widely used in industries exposed to chemicals, chlorides, and elevated temperatures, providing durability and mechanical strength in critical applications.
The key difference is carbon content. SS 317 has higher carbon, offering slightly greater strength, while SS 317L has low carbon, which improves weldability and resistance to intergranular corrosion. 317L is preferred for welded structures and highly corrosive environments.
These bolts are typically manufactured in accordance with ASTM A193, ASTM A194, DIN 933, ISO 4017, and BS standards. These specifications ensure proper dimensional accuracy, mechanical performance, and compatibility with international engineering requirements.
Selection depends on environmental conditions, load requirements, and fabrication needs. For welded assemblies or corrosive chemical exposure, 317L is recommended. For applications requiring slightly higher strength without welding, SS 317 is suitable.
A reliable manufacturer should offer ISO certification, complete material traceability, and adherence to global standards. KK Fasteners supports international supply with documented quality assurance and consistent manufacturing processes.
Stainless Steel 317/317L Bolts deliver reliable performance in environments where corrosion resistance and structural integrity are essential. With controlled manufacturing processes and global supply capabilities, KK Fasteners supports industrial projects with consistent quality and traceable materials.
For detailed specifications or project-specific requirements, request a quote or connect with the engineering team today.
