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Stainless Steel 304 Nuts are one of the most widely used fastening components in industrial assemblies requiring reliable mechanical strength and strong corrosion resistance. Manufactured from austenitic stainless steel grade 304, these nuts are designed to perform under moderate to highly corrosive environments, making them suitable for marine fittings, chemical processing units, food-grade machinery, and structural fabrication systems. They conform to globally recognized standards such as DIN 934, ISO 4032, and ASTM A194/A194M, ensuring dimensional accuracy and interchangeability across international assemblies.
Engineered for metric and imperial threaded systems, SS 304 nuts provide excellent resistance to oxidation and scaling up to elevated temperatures. Their chromium-nickel composition ensures long-term stability even in humid or chemically active environments.
KK Fasteners supplies these nuts to industrial buyers across global markets, ensuring consistent material traceability, batch testing, and compliance with international fastening standards for critical applications.
| Material | Stainless Steel 304 (Austenitic Grade) |
|---|---|
| Equivalent Grades | AISI 304 / EN 1.4301 / UNS S30400 |
| Standards | DIN 934, ISO 4032, ASTM A194, BS 3692, JIS B1181 |
| Size Range | M3 to M64 / 1/8" to 2-1/2" |
| Thread Type | Metric (Coarse & Fine), UNC, UNF |
| Types | Hex Nut, Heavy Hex Nut, Lock Nut, Slotted Nut |
| Surface Finish | Bright, Polished, Passivated, Black Oxide (on request) |
| Hardness | ≤ 201 HB (Annealed Condition) |
| Tensile Strength | Minimum 515 MPa |
| Yield Strength | Minimum 205 MPa |
| Temperature Resistance | Up to 870°C (Intermittent) |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N |
| 304 | 0.08 max | 2.0 max | 0.75 max | 0.045 | 0.030 | 18.0-20.0 | – | 8.0-10.5 | 0.10 |
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness Rockwell B (HR B) max | Hardness Brinell (HB) max |
| 304 | 515 | 205 | 40 | 92 | 201 |
| AISI Grade Equivalent | JIS Equivalent | Stainless Steel Notation | EN/DIN Numerical Equivalent | UNS designation |
EN/DIN Symbolical Equivalent |
| AISI 304 | SUS304 | SS 304 | EN 1.4301 | UNS S30400 | X4CrNi18-10 |
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 |
|
Nut Size
|
Diameter*
|
Height
|
||
|---|---|---|---|---|
|
Hex Nut
|
Jam Nut
|
Nylock Nut
|
||
|
2
|
4
|
1.6
|
1.2
|
-
|
|
2.5
|
5
|
2
|
1.6
|
-
|
|
3
|
5.5
|
2.4
|
1.8
|
4
|
|
4
|
7
|
3.2
|
2.2
|
5
|
|
5
|
8
|
4
|
2.7
|
5
|
|
6
|
10
|
5
|
3.2
|
6
|
|
7
|
11
|
5.5
|
3.5
|
-
|
|
8
|
13
|
6.5
|
4
|
8
|
|
10
|
17
|
8
|
5
|
10
|
|
12
|
19
|
10
|
6
|
12
|
|
14
|
22
|
11
|
7
|
14
|
|
16
|
24
|
13
|
8
|
16
|
|
18
|
27
|
15
|
9
|
18.5
|
|
20
|
30
|
16
|
10
|
20
|
|
* This is the diameter across the flats. It is also the size of wrench to use.
|
||||
Stainless Steel 304 Nuts are used wherever secure mechanical fastening and corrosion resistance are essential for structural integrity. They are widely adopted across multiple engineering sectors due to their reliability and standard compatibility.
The production of Stainless Steel 304 Nuts involves cold forging and precision CNC threading, ensuring consistent dimensional accuracy and mechanical performance. Each batch undergoes strict quality inspection including thread gauge verification, tensile testing, and hardness measurement.
Surface finishing includes pickling and passivation to enhance corrosion resistance by removing free iron particles from the surface. Lot traceability is maintained throughout production for full material certification compliance.
At KK Fasteners, every production stage follows ISO 9001 quality management protocols, ensuring that each nut meets international fastening reliability standards before dispatch.
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Stainless Steel 304 Nuts are precision-engineered fastening components made from austenitic SS 304 material. They are designed to secure bolted joints in machinery, structures, and equipment while offering strong corrosion resistance and reliable mechanical strength in industrial environments.
SS 304 nuts provide excellent general-purpose corrosion resistance and are suitable for most industrial and structural applications. SS 316 nuts contain molybdenum, which enhances resistance against chlorides and seawater, making them more suitable for marine and highly corrosive environments.
These nuts are commonly manufactured in compliance with international standards such as DIN 934, ISO 4032, ASTM A194, and BS 3692. These standards ensure dimensional accuracy, thread compatibility, and mechanical performance across global applications.
They are widely used in automotive assemblies, construction structures, food processing equipment, chemical plants, and general engineering applications. Their corrosion resistance and strength make them suitable for both indoor and moderately aggressive outdoor environments.
A reliable manufacturer should offer certified materials, ISO-compliant production systems, full traceability, and adherence to international standards. Buyers should also evaluate quality testing procedures and export capability. Suppliers like KK Fasteners support global procurement with consistent quality and documentation.
Stainless Steel 304 Nuts remain a critical fastening solution for industries requiring dependable performance and corrosion resistance across global operating conditions. With precision manufacturing, certified quality systems, and export-ready logistics, KK Fasteners supports OEMs and industrial buyers with consistent supply and technical reliability.
For detailed specifications, bulk pricing, or custom requirements, contact the engineering team at KK Fasteners to request a quote or technical datasheet.
