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Stainless Steel 316/316L screws are high-performance fastening components engineered for environments where corrosion resistance, mechanical integrity, and long-term reliability are critical. Manufactured from molybdenum-bearing austenitic stainless steel, these screws conform to international standards such as ASTM A193, DIN, and ISO, making them suitable for global industrial use across marine, chemical processing, oil & gas, and food-grade applications.
The addition of molybdenum enhances resistance to chlorides and aggressive chemicals, while the low-carbon variant (316L) minimizes carbide precipitation during welding. This ensures structural stability even in high-temperature or welded assemblies. Stainless Steel 316/316L screws are widely specified in offshore platforms, desalination plants, and pharmaceutical equipment where material failure is not an option.
KK Fasteners supplies these screws with full material traceability and compliance documentation, supporting project requirements across multiple international markets with consistent dimensional accuracy and metallurgical integrity.
| Parameter | Details |
|---|---|
| Material | Stainless Steel 316, 316L |
| Grade | ASTM A193 B8M Class 1 & 2, ASTM F593 |
| Size Range | M2 to M36 / 1/8" to 1-1/2" |
| Length | Up to 300 mm |
| Thread Type | Metric, UNC, UNF, BSW, BSF |
| Standards | DIN 933, DIN 912, ISO 4014, ASTM A193 |
| Surface Finish | Plain, Passivated, Polished |
| Types | Hex Head, Socket Head, Machine Screws, Self-Tapping Screws |
| Tensile Strength | 515 – 620 MPa |
| Hardness | Max 95 HRB |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 316 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 316L 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 | ||||
| 316 | 515 | 205 | 40 | 95 | 217 |
| 316L | 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 | |||||
| 316/316L 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
|
| Torque Specifications | |||||||
|---|---|---|---|---|---|---|---|
| Screw Size Inches or # |
Threads Per Inch |
Standard Dry Torque in Inch-Pounds | |||||
| 304
SS |
316
SS |
||||||
| #2 | 56 | 2.5 | 2.6 | ||||
| 64 | 3.0 | 3.2 | |||||
| #3 | 48 | 3.9 | 4.0 | ||||
| 56 | 4.4 | 4.6 | |||||
| #4 | 40 | 5.2 | 5.5 | ||||
| 48 | 6.6 | 6.9 | |||||
| #5 | 40 | 7.7 | 8.1 | ||||
| 44 | 9.4 | 9.8 | |||||
| #6 | 32 | 9.6 | 10.1 | ||||
| 40 | 12.1 | 12.7 | |||||
| #8 | 32 | 19.8 | 20.7 | ||||
| 36 | 22.0 | 23.0 | |||||
| #10 | 24 | 22.8 | 23.8 | ||||
| 32 | 31.7 | 33.1 | |||||
| Screw Size Inches or # |
Threads Per Inch |
Standard Dry Torque in Inch-Pounds | |||||
| 304
SS |
316
SS |
||||||
| 1/4 | 20 | 75.2 | 78.8 | ||||
| 28 | 94.0 | 99.0 | |||||
| 5/16 | 18 | 132 | 138 | ||||
| 24 | 142 | 147 | |||||
| 3/8 | 16 | 236 | 247 | ||||
| 24 | 259 | 271 | |||||
| 7/16 | 14 | 376 | 393 | ||||
| 20 | 400 | 418 | |||||
| 1/2 | 13 | 517 | 542 | ||||
| 20 | 541 | 565 | |||||
| Screw Size Inches or # |
Threads Per Inch |
Standard Dry Torque in Inch-Pounds | |||||
| 304
SS |
316
SS |
||||||
| 9/16 | 12 | 682 | 713 | ||||
| 18 | 752 | 787 | |||||
| 5/8 | 11 | 1110 | 1160 | ||||
| 18 | 1244 | 1301 | |||||
| 3/4 | 10 | 1530 | 1582 | ||||
| 16 | 1490 | 1558 | |||||
| 7/8 | 9 | 2328 | 2430 | ||||
| 14 | 2318 | 2420 | |||||
| 1 | 8 | 3440 | 3595 | ||||
| 14 | 3110 | 3250 | |||||
| Screw Size Inches or # |
Threads Per Inch |
Standard Dry Torque in Foot-Pounds | |||||
| 304
SS |
316
SS |
||||||
| 1 1/8 | 7 | 413 | 432 | ||||
| 12 | 390 | 408 | |||||
| 1 1/4 | 7 | 523 | 546 | ||||
| 12 | 480 | 504 | |||||
| 1 1/2 | 6 | 888 | 930 | ||||
| 12 | 703 | 732 | |||||
Stainless Steel 316/316L screws are used in industries requiring high corrosion resistance, structural reliability, and compliance with global engineering standards.
These screws are typically produced using cold forging for smaller diameters and CNC machining for precision-critical or larger sizes. Thread rolling ensures enhanced fatigue resistance and surface finish compared to cut threads.
Quality control includes dimensional inspection using calibrated gauges, tensile and hardness testing, and surface verification through passivation checks. Each batch is traceable through heat numbers and material test certificates (MTCs).
At KK Fasteners, manufacturing follows ISO 9001-certified processes, with compliance to RoHS and REACH standards where required. Inspection protocols ensure that every shipment meets international specifications and project-specific tolerances.
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Stainless Steel 316/316L screws are corrosion-resistant fasteners made from molybdenum-alloyed austenitic stainless steel. They are widely used in marine, chemical, and high-temperature environments where resistance to chlorides and aggressive media is essential for long-term performance.
The main difference is carbon content. SS 316L has a lower carbon level (maximum 0.03%), which prevents carbide precipitation during welding, improving corrosion resistance in welded applications. SS 316, with higher carbon content, provides slightly better tensile strength for non-welded uses.
These screws are manufactured according to international standards such as ASTM A193 B8M, ASTM F593, DIN 933, DIN 912, and ISO 4014. These standards ensure dimensional accuracy, mechanical strength, and compatibility with global engineering requirements.
Select SS 316 for applications requiring higher strength and minimal welding. Choose SS 316L for welded structures or environments where maximum corrosion resistance is required, especially in marine, pharmaceutical, or chemical processing industries.
A reliable supplier should provide ISO-certified manufacturing, full material traceability, and compliance with ASTM/DIN standards. KK Fasteners supports global buyers with consistent quality control, documented inspection reports, and export experience across multiple industries.
For projects where corrosion resistance and dimensional accuracy cannot be compromised, Stainless Steel 316/316L screws offer a proven solution across industries. KK Fasteners supports global procurement teams with traceable materials, consistent quality, and export-ready logistics.
Request a technical quote or connect with the engineering team to specify your exact requirement.
