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Stainless Steel 904L Screws are high-alloy fastening components engineered for extreme corrosion environments where standard stainless steels like 304 and 316 fail. Manufactured using a low-carbon, high-nickel, and molybdenum-rich austenitic stainless steel (UNS N08904), these screws deliver superior resistance against pitting, crevice corrosion, and stress corrosion cracking in chloride-heavy and acidic conditions. They are widely used in chemical processing plants, offshore oil and gas systems, desalination units, and marine engineering structures.
Designed for long-term structural integrity under aggressive exposure, these screws maintain mechanical stability even in highly oxidizing environments. KK Fasteners supplies Stainless Steel 904L Screws to global industrial clients with strict adherence to dimensional accuracy, ASTM B625 material compliance, and full traceability across production batches. This makes them a preferred choice for critical applications where failure is not an option and lifecycle cost reduction is essential.
| Parameter | Specification |
|---|---|
| Material | Stainless Steel 904L (UNS N08904) |
| Grade | Austenitic High Alloy Stainless Steel |
| Standards | ASTM B625, ASTM A276, DIN 1.4539, EN 10088 |
| Size Range | M3 to M36 / #6 to 1.5 inch |
| Thread Type | Metric (ISO), UNC, UNF, BSW |
| Tensile Strength | 490 – 700 MPa |
| Hardness | Max 70 HRB |
| Surface Finish | Bright Polished, Passivated, Black Oxide, PTFE Coated |
| Types | Hex Head, Socket Head, Countersunk, Machine Screws, Self-Tapping |
| Corrosion Resistance | Excellent resistance to acids, seawater, and chloride environments |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 904L | min. | – | – | – | – | – | 18.0 | – | 8.0 | – |
| max. | 0.08 | 2.0 | 0.75 | 0.045 | 0.030 | 20.0 | 10.5 | 0.10 | ||
| 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 | ||||
| 904L | 515 | 205 | 40 | 92 | 201 |
| 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 | |||||
| 904L | 8000 | 193 | 17.2 | 17.8 | 18.4 | 16.2 | 21.5 | 500 | 720 |
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 904L Screws are used in industries where corrosion resistance and long service life are critical under chemical or marine exposure conditions.
Stainless Steel 904L Screws are manufactured using precision cold forging and CNC machining processes to ensure dimensional consistency and mechanical reliability. Each production batch undergoes controlled heat treatment to stabilize the austenitic structure and enhance corrosion resistance properties.
KK Fasteners implements multi-stage quality checks including dimensional inspection, thread gauge verification, hardness testing, and surface finish analysis. Every batch is fully traceable with material test certificates (MTC) aligned to ASTM and EN standards. Additional compliance with ISO 9001, RoHS, and REACH ensures suitability for global industrial procurement requirements. Surface passivation is applied to enhance oxide layer stability and improve long-term corrosion performance.
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Stainless Steel 904L Screws are high-alloy austenitic fasteners designed for extreme corrosion environments. Made from UNS N08904 stainless steel, they provide excellent resistance to acids, chlorides, and seawater, making them ideal for chemical processing, marine, and offshore applications where standard stainless steel grades fail.
Yes, 904L offers significantly higher corrosion resistance compared to 316 stainless steel. The increased nickel and molybdenum content improves resistance against pitting, crevice corrosion, and acidic attack, especially in sulfuric acid and chloride-rich environments. It is used in more aggressive and critical industrial conditions.
Stainless Steel 904L Screws are manufactured in compliance with ASTM B625, ASTM A276, DIN 1.4539, and EN 10088 standards. These specifications ensure controlled chemical composition, mechanical strength, and consistent corrosion resistance for industrial-grade applications.
These screws are widely used in chemical processing plants, offshore oil and gas platforms, marine engineering, desalination plants, pharmaceutical equipment, and power generation systems. They are selected for applications where exposure to harsh chemicals and seawater is continuous.
A reliable manufacturer should provide material traceability, ISO certification, ASTM-compliant production, and consistent dimensional accuracy. KK Fasteners supplies certified Stainless Steel 904L Screws with full inspection reports and supports global industrial procurement across multiple sectors.
Stainless Steel 904L Screws are engineered for environments where corrosion failure is not acceptable, offering long-term reliability in critical industrial systems. KK Fasteners supports global procurement teams with traceable, specification-driven fastening solutions tailored for demanding applications. For technical datasheets, bulk pricing, or custom manufacturing requirements, contact KK Fasteners to connect with their engineering support team and request a detailed quotation.
