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Stainless Steel 310/310S Screws are high-performance fastening components engineered for extreme temperature and corrosive environments where conventional fasteners fail. Manufactured from austenitic chromium-nickel alloys, these screws offer exceptional oxidation resistance up to 1100°C (intermittent service) and maintain structural integrity under thermal cycling conditions. Commonly produced in accordance with ASTM, DIN, and ISO standards, they are widely used in petrochemical plants, heat treatment facilities, and power generation systems.
These screws play a critical role in assemblies exposed to high heat, such as furnace components, burners, and exhaust systems, where creep resistance and scaling resistance are essential. Their low carbon variant (310S) reduces carbide precipitation, making them suitable for welding and high-temperature structural applications.
KK Fasteners supplies Stainless Steel 310/310S Screws to global industrial markets, ensuring full traceability, consistent metallurgy, and compliance with international standards for demanding engineering applications.
| Parameter | Details |
|---|---|
| Material | Stainless Steel 310, 310S (UNS S31000 / S31008) |
| Grade Standards | ASTM A193 B8, ASTM A320, DIN 1.4841 |
| Size Range | M2 to M64 / 1/8" to 2" |
| Thread Type | Metric (ISO), UNC, UNF, BSW |
| Standards | DIN 933, DIN 912, ISO 4017, ISO 4762 |
| Surface Finish | Plain, Passivated, Polished, PTFE Coated |
| Types | Hex Head, Socket Head, Pan Head, Countersunk, Set Screws |
| Tensile Strength | ≥ 515 MPa |
| Hardness | Max 95 HRB |
| Temperature Resistance | Up to 1100°C (intermittent) |
Grade |
C |
Mn |
Si |
P |
S |
Cr |
Mo |
Ni |
N |
|
310/310S |
min. |
– |
– |
– |
– |
– |
24.0 |
– |
19.0 |
– |
max. |
0.25 |
2.0 |
1.50 |
0.045 |
0.030 |
26.0 |
22.0 |
– |
||
Grade
|
Tensile Strength (MPa) min
|
Yield Strength 0.2% Proof (MPa) min
|
Elongation (% in 50mm) min
|
Hardness
|
|
Rockwell B (HR B) max
|
Brine-ll (HB) max
|
||||
310/310S |
515 |
205 |
40 |
95 |
217 |
Grade
|
Density (kg/m3)
|
Elastic Modulus (GPa)
|
Mean Coefficient of Thermal Expansion (m/m/°C)
|
Thermal Conductivity (W/m.K)
|
Specific Heat 0-100°C (J/kg.K)
|
Electrical Resistivity
(n.m) |
|||
|---|---|---|---|---|---|---|---|---|---|
0-100°C
|
0-315°C
|
0-538°C
|
at 100°C
|
at 500°C
|
|||||
310/310S |
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 310/310S Screws are primarily used in high-temperature and corrosion-intensive industrial environments where standard fasteners cannot maintain performance.
Stainless Steel 310/310S Screws are typically produced using cold forging for standard sizes and CNC machining for precision or custom geometries. The process ensures consistent grain structure and mechanical properties, essential for high-temperature performance.
Quality assurance includes dimensional inspection using calibrated gauges, tensile and hardness testing per ASTM standards, and surface finish verification for corrosion resistance. Each batch undergoes material composition analysis using spectrometry to confirm alloy integrity.
KK Fasteners follows strict inspection protocols aligned with ISO 9001 standards, ensuring traceability from raw material to finished product. Documentation such as mill test certificates (MTC) and compliance reports are provided with every shipment.
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Stainless Steel 310/310S screws are high-temperature resistant fasteners made from chromium-nickel austenitic alloys. They are specifically designed to withstand oxidation, scaling, and thermal stress, making them suitable for use in furnaces, heat exchangers, and other heat-intensive industrial environments.
The key difference is carbon content. SS 310 contains higher carbon, which provides slightly better strength at elevated temperatures. SS 310S has lower carbon, reducing the risk of carbide precipitation and making it more suitable for welding and applications requiring resistance to intergranular corrosion.
These screws are typically manufactured according to ASTM A193, DIN 933, ISO 4017, and similar international standards. The material grades correspond to UNS S31000 (310) and S31008 (310S), ensuring consistency in chemical composition and mechanical properties.
Selection depends on operating temperature, load conditions, and fabrication requirements. Use SS 310 where higher strength is needed without welding, and SS 310S where welding is involved or where resistance to sensitization and corrosion at high temperatures is critical.
A reliable supplier should offer ISO-certified manufacturing, full material traceability, and compliance with ASTM/DIN standards. KK Fasteners provides detailed test certificates, consistent production quality, and experience in supplying to global industrial markets.
For high-temperature fastening requirements, consistent material quality and dimensional accuracy are critical to long-term performance. KK Fasteners ensures every Stainless Steel 310/310S Screw meets stringent inspection and traceability standards. For project-specific requirements or bulk orders, request a quote or connect with the technical team to evaluate the right specification for your application.
