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Stainless Steel 310/310S Nuts are engineered fastening components designed for extreme thermal environments where standard stainless steels fail due to oxidation or creep deformation. Manufactured from a high chromium–nickel austenitic alloy, these nuts perform reliably in continuous service temperatures up to approximately 1100°C, making them essential in furnace assemblies, heat treatment equipment, petrochemical processing units, and power generation systems.
The primary difference between 310 and 310S lies in carbon content, where 310S offers improved weldability and reduced carbide precipitation at elevated temperatures. These nuts are commonly produced under standards such as ASTM A194, DIN 934 equivalents, and ISO metric specifications depending on application requirements.
In industrial procurement, Stainless Steel 310/310S Nuts are selected not only for mechanical strength but also for their resistance to scaling and thermal fatigue. KK Fasteners supplies these nuts to global engineering industries with controlled material traceability and dimensional precision suitable for critical high-temperature assemblies across energy and heavy manufacturing sectors.
| Parameter | Specification |
|---|---|
| Material Grades | Stainless Steel 310, Stainless Steel 310S |
| Standards | ASTM A194, ASTM A276, DIN 934, ISO 4032, BS 3692 |
| Size Range | M6 to M100 / 1/4" to 4" |
| Thread Types | Metric (ISO), UNC, UNF, BSW |
| Surface Finish | Bright, Polished, Passivated |
| Type Variants | Hex Nuts, Heavy Hex Nuts, Lock Nuts, Square Nuts |
| Temperature Resistance | Up to 1100°C (continuous service) |
| Tensile Strength | 515–750 MPa (depending on form and heat treatment) |
SS Grade |
Mn |
Si |
C |
N |
Cr |
S |
P |
Mo |
Ni |
|
310 |
minimum
maximum |
-
2.00 |
-
1.50 |
-
0.25 |
- |
24.0
26.0 |
-
0.030 |
-
0.045 |
- |
19.0
22.0 |
310S |
minimum
maximum |
-
2.00 |
-
1.50 |
-
0.08 |
- |
24.0
26.0 |
-
0.030 |
-
0.045 |
- |
19.0
22.0 |
SS Grade |
(% in 50mm) Elongation minimum |
0.2% Proof Yield Strength (MPa) minimum |
Strength of Tensile (MPa) minimum |
Plate Hardness |
|
|
Brinell (HB)
max |
Rockwell B (HR B) max |
||||
310 |
40 |
205 |
515 |
217 |
95 |
310S |
40 |
205 |
515 |
217 |
95 |
Grade |
British |
Euronorm |
UNS |
SS |
JIS |
||
European Standards |
British Standards |
DIN No |
Name |
||||
310 |
- |
310S24 |
1.4841 |
X15CrNi25-20 |
S31000 |
- |
SUH 310 |
310S |
- |
310S16 |
1.4845 |
X8CrNi25-21 |
S31008 |
2361 |
SUS 310S |
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 310/310S Nuts are used in environments where both heat and corrosion resistance are critical. They are essential fastening components in systems exposed to continuous thermal stress and aggressive operating conditions.
The production of Stainless Steel 310/310S Nuts involves precision cold forging followed by controlled heat treatment to enhance mechanical strength and structural consistency. Threading is executed using high-accuracy CNC machining to maintain strict dimensional tolerances.
Each batch undergoes multi-stage inspection including dimensional verification, tensile testing, hardness evaluation, and surface passivation checks. Heat number traceability ensures complete material tracking from raw stock to finished fastener. KK Fasteners integrates ISO 9001:2015 quality systems along with RoHS and REACH compliance for global industrial supply standards. Every nut is validated for performance consistency before export dispatch.
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Stainless Steel 310/310S Nuts are high-temperature resistant fastening components made from austenitic stainless steel alloys designed for extreme heat environments. They maintain mechanical strength and oxidation resistance in applications such as furnaces, refineries, and thermal processing systems operating above 800°C.
Yes, SS 310/310S performs significantly better than SS 316 in high-temperature environments. While SS 316 is optimized for corrosion resistance in chemical and marine conditions, SS 310 offers superior oxidation resistance and creep strength at elevated temperatures up to 1100°C.
These nuts are commonly manufactured under ASTM A194, ASTM A276, DIN 934, ISO 4032, and BS 3692 standards. These specifications ensure consistent mechanical performance, dimensional accuracy, and material quality for industrial-grade applications.
They are widely used in furnace construction, petrochemical refineries, power plants, cement kilns, and heat treatment equipment. Their ability to withstand thermal cycling makes them ideal for continuous high-temperature industrial operations.
Buyers should evaluate manufacturers based on material traceability, ISO certification, compliance with ASTM/DIN standards, testing capabilities, and export experience. Suppliers like KK Fasteners provide documented quality control, global shipping support, and technical consultation for industrial procurement.
Stainless Steel 310/310S Nuts deliver reliable performance in extreme thermal environments where standard fasteners fail. Their combination of oxidation resistance, creep strength, and dimensional stability makes them essential for critical industrial systems.
KK Fasteners supports global engineering projects with precision-manufactured fasteners backed by strict quality control and export-ready documentation. For technical specifications, pricing, or custom requirements, connect with their engineering team to request a detailed quotation or datasheet.
