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310 Stainless Steel Fasteners

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310 Stainless Steel Fasteners

Designed for high temperature applications, 310 stainless steel fasteners provide high temperature oxidation resistance to 2000°F under mild cyclic conditions. An economic alternative to nickel alloys like alloy 330 or Inconel, 310 fasteners provide slightly less strength and temperature resistance – but at a significantly lower price point. Alloy 310 can be used in moderately caburizing, moderately oxidizing, nitriding, cementing and thermal cycling applications when not used at the maximum service temperature. 310SS fasteners also have good resistance to sulfidation and other forms of hot corrosion. Although primarily known for its high temperature properties, 310 stainless steel also provides excellent performance at cryogenic temperatures, with toughness down to -450˚F. Though 310 is ideal for high temperature use, it should not be exposed to the severe thermal shock of repeated liquid quenching or where aqueous corrosive contaminants are present.

RAYCHIN SPECIALTY METALS FASTENERS: BOLTS, NUTS, SCREWS, WASHERS, STUDS, THREADED RODS, U-BOLT, J-BOLTS

STANDARD AND CUSTOMIZED, SMALL BATCH AND LARGE BATCH, IMPERIAL AND METRIC

Good high temperature oxidation resistance to 2000°F
High temperature stability for moderate strength applications
Good oxidation and carburization resistant to 2000°F
Resistance to moderate sulfidation and nitriding
Economic alternative to high temperature nickel alloys
High temperature resistance.
Excellent resistance to oxidation under mildly cyclic conditions.
Good resistance to sulfidation and atmospheres where sulfur dioxide gas is encountered at elevated temperatures.
Good resistance to thermal fatigue.
Excellent toughness to cryogenic temperatures of -450°F.
Low magnetic permeability.
Good ductility and weldability.

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RAYCHIN LIMITED

Name: 310 Stainless Steel Fasteners
SKU: 0

Specialist in 310 Stainless Steel Fasteners · Bolts · Nuts · Screws · Washers · Stud Bolts · Threaded Rods

310 Stainless Steel Fasteners: Bolts, Nuts, Screws, Washers, Stud Bolts & Threaded Rods

High-Temperature Austenitic Stainless Steel (UNS S31000 / 1.4845 / X8CrNi25-21)

RAYCHIN LIMITED is a recognized expert in 310 stainless steel fasteners — from 310 SS bolts, 310 SS nuts, 310 SS screws, 310 SS washers to 310 SS stud bolts and 310 SS threaded rods. Our portfolio includes hex bolts, heavy hex bolts, hex nuts, socket head cap screws, flat and lock washers, continuous thread rods, double-end studs, and custom non-standard fasteners. Grade 310 (UNS S31000) is a high-carbon austenitic stainless steel with 25% chromium and 20% nickel, developed specifically for high-temperature service up to 1150°C (2100°F). It offers exceptional oxidation resistance and creep strength, making it ideal for furnace equipment, heat treatment fixtures, power generation, and chemical processing applications. Our portfolio includes fasteners manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN and KS standards. 310 stainless steel fasteners are available in solution annealed condition with full traceability.

310 stainless steel fasteners310 SS bolts310 SS nuts310 SS screws310 SS washers310 SS stud bolts310 SS threaded rods310 stainless steel hex bolts310 stainless steel hex nuts310 stainless steel flat washersUNS S31000 fasteners1.4845 fasteners310S fastenersheat resistant fasteners

Expertise Across the Full 310 Stainless Steel Fastener Range

310 SS Bolts & Stud Bolts

Hex bolts, heavy hex bolts, structural bolts, flange bolts, socket head cap screws, and precision 310 SS stud bolts with UNC/UNF or metric threads. Diameters from 1/4" to 4" (M6 – M100). Lengths up to 4000 mm for threaded rods. Manufactured to ASME B18.2.1, DIN 931, DIN 933, and ISO 4014 standards. All 310 stainless steel stud bolts available with two heavy hex nuts manufactured from matching 310 material. Ideal for high-temperature applications up to 1150°C.

310 SS Nuts

Hex nuts, heavy hex nuts, jam nuts, slotted/castle nuts, flange nuts, square nuts, coupling nuts, and dome nuts. Precision tapped 310 SS nuts meet Class 2B / 6H. Proof load tested in accordance with applicable ASTM standards. Our inventory includes 310 stainless steel coupling nuts for threaded rod connections in furnace and heat treatment applications. Excellent oxidation resistance at elevated temperatures.

310 SS Screws

Machine screws (pan, flat, round, truss head), socket set screws, button head cap screws, flat head cap screws, and self-tapping screws. 310 SS screws are ideal for high-temperature assemblies requiring both oxidation resistance and mechanical strength. Custom drive types available including Phillips, Torx, and combo drive. Suitable for continuous service up to 1150°C.

310 SS Washers

Flat washers (USS, SAE, and oversize), spring lock washers, toothed lock washers, and thrust washers. Our 310 stainless steel washers are punched or machined from solution-annealed bar/plate, providing uniform oxidation resistance across the entire surface. Precise flatness and chamfers for critical high-temperature sealing applications in furnaces and heat exchangers.

310 SS Threaded Rods

Continuous thread rods (full thread) in 1m, 2m, 3m lengths or custom cut. 310 SS threaded rods meet ASTM A479 and ASTM A276 specifications. Used as tie rods, anchor bolts, and furnace supports in high-temperature environments. Also supplied with rolled threads for improved grain flow and fatigue resistance. Maintains strength up to 1150°C continuous service.

Custom & Specialty 310 SS Fasteners

From 310 stainless steel dowel pins to valve stem extensions and specialized studs for heat treatment furnaces, we machine complex geometries. Expert solution annealing (1040°C followed by water quenching) precisely controlled for each batch. Manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS standards.

Manufacturing Standards for 310 Stainless Steel Fasteners

RAYCHIN LIMITED manufactures 310 stainless steel fasteners to the following national and international standards, ensuring full compliance for projects worldwide. Both standard and non-standard custom configurations are available.

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310 Stainless Steel Fastener Styles

310 Stainless Steel Screws	12 Point Screws Button Head Cap Screws Flat Head Screws Hex Head Cap Screws Pan Head Screws Security Screws Set Screws Socket Head Cap Screws Vented Screws	• DIN 603 / ISO 8677 • DIN 912 / ISO 4762 • DIN 913 / ISO 4026 • DIN 914 / ISO 4027 • DIN 915 / ISO 4028 • DIN 916 / ISO 4029 • DIN 921 • DIN 931 / ISO 4014 • DIN 933 / ISO 4017 • DIN 961 / ISO 8676 • DIN 965 / ISO 7046 • DIN 966 / ISO 7047 • DIN 7991 / ISO 10642 • DIN 7380 / ISO 7380 • DIN 84 / ISO 1207 • DIN 85 / ISO 1580 • DIN 34822 • DIN 34821 • DIN 7504 / ISO 15480 • DIN 7984 • DIN 963 / ISO 2009




















310 Stainless Steel Bolts	Hex Head Bolts Shoulder Bolts Wedge Anchor Bolts	• DIN 931 • DIN 933 • ISO 4014 • ISO 4017 • ISO 7370




310 Stainless Steel Nuts	Hex Nuts Lock Nuts	• DIN 439 / ISO 4035 • DIN 934 / ISO 4032 • DIN 985 / ISO 7040 • DIN 986 • DIN 980 / ISO 7042 / ISO 19513 • DIN 6923 / ISO 4161





310 Stainless Steel Studs/Rod	Studs Threaded Rod Weld Studs	• DIN 975 • DIN 976


310 Stainless Steel Washers	Flat Washers Lock Washer	• DIN 125 / ISO 7089 / ISO 7090 • DIN 126 / ISO 7091 • DIN 127 / ISO 7090 • DIN 9021 / ISO 7093



310 Stainless Steel Hose Clamps	Medium Duty Hose Clamps	--

310 Stainless Steel Screws

12 Point Screws	310 Stainless Steel 12 point screws allow for higher torque to be applied than a socket head cap screw or head head bolt, however they are be less economical due to the complex head design. Available in 1/4" or larger sizes.	• IFI-115 • MIL SPEC • DIN 34822 • DIN 34821



Button Head Cap Screws	310 Stainless Steel button head screws offer a wide clamping area and low profile. They are best for fastening material that is too thin to counter bore.	• ASME B18.3 • ASME 18.3.4M • DIN 7380 / ISO 7380


Flat Head Screws	310 Stainless Steel flat head screws are most commonly offered in an 82° countersink angle, but can be customized to other angles from 60° -120° and are designed to be flush with the surface. Available in slotted and socket drivers. Phillips, 6-lobe, torx and tamperproof drivers in Inconel flat head screws can be made require special manufacturing.	• ASME B18.3 • ASME B18.3.6 • DIN 963 / ISO 2009 • DIN 965 / ISO 7046 • DIN 7991 / ISO 10642




Hex Head Cap Screws	310 Stainless Steel hex head cap screws offer the added washer face to the bolt head which is lacking on a hex bolt and tighter dimensional tolerances. Ideal for a high clamping force applications with ease of access. Generally availabe in #2 - 1/2" sizes and metric sizes.	• ASME B18.6.3 • DIN 931 / ISO 4014 • DIN 933 / ISO 4017 • DIN 961 / ISO 8676



Pan Head Screws	310 Stainless Steel pan head screws offer a rounded top are best used for small diameter faster needs. Offered in slotted and they are ideal for low torque applications.	• ASME B18.6.3 • DIN 7985 • DIN 921 • DIN 85 / ISO 1580 • DIN 84 / ISO 1207 (cheese head) • DIN 966 / ISO 7047 (raised counter sunk)







Security Screws	Unique driver designs offer these 310 Stainless Steel screws resistance to unwanted tampering or removal due to the fact that they cannot be removed using an ordinary driver. Inconel security screws are available in several different drive styles, as well as custom per print.	--

Set Screws	310 Stainless Steel set screws are available in cup, cone, flat, dog and half-dog points. Set screws have no head and are equiped with a socket or slotted driver at one end.	• ASME B18.3 • DIN 913 / ISO 4026 • DIN 914 / ISO 4027 • DIN 915 / ISO 4028 • DIN 916 / ISO 4029




Socket Head Cap Screws	310 Stainless Steel socket head cap screws are ideal for limited access situations where there is little clearance around the screws. They offer a safe, reliable and economic solution.	• ASMET B18.3 • DIN 912 / ISO 4762 • DIN 7984


Vented Screws	310 Stainless Steel vented screws are best for vacuum environments because the hole drilled through its axis (from head through threads) allow gases and other contaminents to vent. Inconel vented screws are available in any style.	--

310 Stainless Steel Bolts

Hex Head Bolts	310 Stainless Steel hex bolts are similar to hex head cap screws but without the added washer face. They are ideal for high clamping force applications with ease access.	• ASME B18.2.1 • DIN 931 / ISO 4014 • DIN 933 / ISO 4017


Shoulder Bolts	310 Stainless Steel shoulder bolts are made up of a head, shoulder and threaded segment. The smooth shoulder section allows for rotating parts. Typically available with socket drivers.	• ASME • DIN 7379 / ISO 7379 • ISO 7370


Wedge Anchor Bolts	310 Stainless Steel wedge anchor bolts offer a safe secure fastening solution for attaching equipment and other materials to concrete in corrosive environments.	--

310 Stainless Steel Nuts

Hex Nuts	310 Stainless Steel hex nuts are available in a variety of styles including finished hex nuts, jam nuts and heavy hex nuts.	• ASME B18.16.3 • ASME B18.2.2 • DIN 439 / ISO 4035 • DIN 934 / ISO 4032 • DIN 986




Lock Nuts	310 Stainless Steel lock nuts are available in all metal and polymer insert styles. All-metal lock provide even load distribution and can be used at high temperatures. Polymer insert styles are more economical and are best for temperatures under than 350°F.	• ASME B18.16.3M • DIN 980 / ISO 7042 / ISO 19513 • DIN 6923 / ISO 4161 • DIN 985 / ISO 10511 / ISO 7040

310 Stainless Steel Studs & Threaded Rod

Studs	310 Stainless Steel studs are fully threaded or partially threaded and made to custom lengths.	• ASME B18.31.2 • DIN 976

Threaded Rod	310 Stainless Steel threaded rod or all thread are available in lengths greater than 1 foot. Minimum order quantity is a total of 6 feet of length.	• ASME B1.1 • DIN 975

Weld Studs	310 Stainless Steel weld studs are available in both arc or capacitor discharge (CD) styles. Weld studs provide an extremely secure fastening solution when one side of the stud needs to be permanently fix to a part and the other side with the threads accessible.	--

310 Stainless Steel Washers

Flat Washers	310 Stainless Steel washers are most commonly offered in SAE sizes, but also availabe in USS, oversized and custom sizes upon request.	• ASME 18.21.1 • SAE / USS • DIN 125 / ISO 7089 / ISO 7090 • DIN 126 / ISO 7091




Lock Washers	310 Stainless Steel lock washers are offered as split lock washers. Belleville spring lock washers can also be made upon request.	• ASME B18.21.1 • DIN 127 / ISO 7090 • DIN 6796 / ISO 10690

International Standards & Global Designations for 310 Stainless Steel Fasteners

To serve clients worldwide, RAYCHIN LIMITED manufactures 310 stainless steel fasteners from material conforming to the following national and international specifications. This ensures full compliance for projects in the Americas, Europe, Asia, and the Middle East.

Country / Region	Standard / Specification	Designation / Grade
USA	ASTM A479 / A276 / A240 / A167, ASME SA-479, ASTM F593 (for fasteners)	UNS S31000 · 310 · 310S (S31008)
Europe (CEN)	EN 10088-3, EN 10269 (for fasteners), EN 10095 (heat resisting)	1.4845 · X8CrNi25-21 · 1.4841 (X15CrNiSi25-21)
Germany (DIN)	DIN EN 1.4845, DIN 17440 (former), DIN 17240 (former)	X8CrNi25-21
France (NF)	NF A35-572/573, NF A35-584	Z12CN25-20 / Z15CN25-20
UK (BS)	BS 970, BS 3146, BS 1501	310S24 / 310S31
China (GB)	GB/T 1220, GB/T 20878, GB/T 4237	0Cr25Ni20 / 2Cr25Ni20 (S31020) / 06Cr25Ni20 (S31008)
Japan (JIS)	JIS G4303, JIS G4311, JIS G4312	SUS310 · SUS310S
ISO	ISO 683-17 (heat-treatable steels), ISO 4955 (heat-resisting)	X8CrNi25-21
NACE	NACE MR0175 / ISO 15156	310 (qualified for sour service with limitations)

UNS S31000 UNS S31008 1.4845 X8CrNi25-21 SUS310 ASTM A479

Chemical Composition (Weight %) – 310 Stainless Steel (UNS S31000 / 1.4845)

Our 310 SS bolts, nuts, screws, washers, stud bolts and threaded rods are produced from melts that strictly conform to the limits below per ASTM A479 / UNS S31000. The high chromium (25%) and nickel (20%) content provide exceptional oxidation resistance and high-temperature strength. The high carbon content (0.25% max) ensures excellent creep resistance at elevated temperatures.

Element	ASTM A479 / UNS S31000 (Range %)	Typical (analysis)
Carbon (C)	≤ 0.25	0.15
Silicon (Si)	≤ 1.50	0.80
Manganese (Mn)	≤ 2.00	1.20
Phosphorus (P)	≤ 0.045	0.025
Sulfur (S)	≤ 0.030	0.010
Chromium (Cr)	24.0 – 26.0	25.0
Nickel (Ni)	19.0 – 22.0	20.5
Iron (Fe)	Balance	Balance

Expert note: The high chromium content (25%) forms a protective Cr₂O₃ layer that provides exceptional oxidation resistance up to 1150°C (2100°F). The high nickel content (20%) stabilizes the austenitic structure and provides excellent resistance to carburization and thermal fatigue. For improved weldability and resistance to sensitization, 310S (UNS S31008) with lower carbon (0.08% max) is available. 310H (UNS S31009) with controlled carbon range (0.04-0.10%) is available for applications requiring optimum creep strength.

Complete Mechanical Properties of 310 Stainless Steel Fasteners (Solution Annealed Condition)

310 stainless steel fasteners are supplied in the solution annealed condition (1040°C minimum followed by water quenching). The data below represent minimum values per ASTM A479 and EN 10088-3.

Mechanical Properties at Room Temperature

Property	Metric (min)	Imperial (min)
Tensile Strength (Rm)	515 MPa	75 ksi
Yield Strength 0.2% (Rp0.2)	205 MPa	30 ksi
Elongation (A5)	40%	40%
Reduction of Area	50%	50%
Hardness (Brinell)	≤ 217 HB	≤ 217 HB
Hardness (Rockwell)	≤ 95 HRB	≤ 95 HRB
Modulus of Elasticity	200 GPa	29,000 ksi
Density	8.0 g/cm³	0.29 lb/in³

High Temperature Performance of 310 Stainless Steel Fasteners

Grade 310 is specifically designed for high-temperature service. Its high chromium and nickel content provide exceptional resistance to oxidation and scaling, while maintaining good mechanical properties at elevated temperatures. 310 stainless steel fasteners are widely used in furnace applications, heat treatment equipment, and power generation components.

Maximum Service Temperatures

Service Condition	Maximum Temperature
Continuous Service (Oxidation Resistance)	1150°C (2100°F)
Intermittent Service	1035°C (1895°F)

The excellent oxidation resistance is due to the formation of a tight, adherent Cr₂O₃ scale that protects the underlying metal. This protective layer reforms rapidly if damaged, provided sufficient chromium is available.

Temperature-Dependent Mechanical Properties

The table below shows typical mechanical properties at elevated temperatures. Note that strength decreases with increasing temperature, but 310 maintains useful strength up to its maximum service temperature.

Temperature	Tensile Strength (MPa)	Yield Strength 0.2% (MPa)	Elongation (%)
650°C (1200°F)	450	165	35
750°C (1400°F)	350	130	35
870°C (1600°F)	210	80	45
980°C (1800°F)	130	50	55
1095°C (2000°F)	70	25	60

Creep and Rupture Strength

For applications requiring long-term stress at elevated temperatures, creep and rupture strength are critical considerations. 310 stainless steel offers excellent creep resistance due to its high carbon content and fully austenitic structure. Typical 10,000-hour rupture strength values:

Temperature	Stress for Rupture in 10,000 hours (MPa)
650°C (1200°F)	110
750°C (1400°F)	55
870°C (1600°F)	25

Thermal Stability Limits

Parameter	Value
Melting Point	1400-1450°C (2550-2650°F)
Thermal Conductivity (100°C)	14.2 W/m·K
Thermal Conductivity (500°C)	18.7 W/m·K
Coefficient of Thermal Expansion (0-100°C)	15.9 × 10⁻⁶ /°C
Coefficient of Thermal Expansion (0-538°C)	17.0 × 10⁻⁶ /°C

Corrosion Resistance of 310 Stainless Steel Fasteners

While 310 is primarily selected for high-temperature applications, it also offers excellent corrosion resistance in many environments due to its high chromium and nickel content.

Oxidation and Scaling Resistance

The high chromium content (25%) provides exceptional resistance to oxidation and scaling. 310 stainless steel fasteners can be used in air up to 1150°C (2100°F) continuously without significant scaling. In intermittent service, the maximum temperature is slightly lower at 1035°C (1895°F).

Corrosion in Other Environments

Environment	Corrosion Resistance	Notes
Aqueous Corrosion	Good	Similar to 304 stainless steel in most environments, with enhanced resistance due to higher chromium and nickel content.
Nitric Acid	Excellent	Widely used for handling nitric acid up to 85% concentration at moderate temperatures.
Sulfur-Containing Atmospheres	Good	Performs better than lower alloy grades, but may be susceptible to sulfidation at very high temperatures.
Carburizing Atmospheres	Good	High nickel content provides good resistance to carburization, though may be less resistant than higher nickel alloys.
Chloride Stress Corrosion Cracking	Better than 304/316	The high nickel content (20%) provides improved resistance to chloride SCC compared to 304 and 316, though it is not immune.

High-Temperature Corrosion Considerations

Sulfidation: In sulfur-containing atmospheres above 800°C, 310 may form sulfides which can reduce service life. For severe sulfidation conditions, higher nickel alloys are recommended.
Carburization: The high nickel content provides good resistance to carbon absorption, though in strongly carburizing atmospheres, alloy 600 or 800 may be preferred.
Nitriding: Ammonia and other nitriding atmospheres can cause surface hardening, which may reduce ductility.
Molten Salts: 310 has good resistance to many molten salts, but performance depends on specific salt composition and temperature.

High-Temperature Engineering Note: For critical applications in high-temperature environments, RAYCHIN LIMITED can provide specialized surface treatments, passivation, or recommend optimal heat treatment conditions. Third-party testing per ASTM standards available upon request. When specifying 310 stainless steel fasteners, consider the maximum service temperature, atmosphere composition, and mechanical load requirements.

Special focus: 310 Stainless Steel Fasteners for High-Temperature Applications

For critical applications requiring oxidation resistance and mechanical strength at elevated temperatures, RAYCHIN offers 310 stainless steel fasteners manufactured to ASTM, ASME, and customer-specific specifications. Our capabilities include:

Furnace Applications: Heat treatment furnaces, annealing covers, radiant tubes, burner components, fire box sheets, boiler baffles, kilns, saggers
Power Generation: Boiler components, superheater supports, combustion tubes, refractory anchor bolts, turbine components
Chemical Processing: High-temperature reactors, crackers, reformers, heat exchangers, thermowell assemblies
Aerospace: Jet engine components, afterburner parts, exhaust systems, combustion chambers
Thread Specifications: UNC/UNF, metric coarse/fine, UNJ, MJ – all classes 2A/6g
Surface Treatments: Passivation, silver plating (for anti-galling), high-temperature anti-seize coatings
Available Grades: 310 (standard), 310S (low carbon), 310H (controlled carbon for creep strength), 310Cb (niobium-stabilized)
Custom: Non-standard lengths, special head configurations, unique diameters per customer drawings

All 310 stainless steel fasteners are supplied with full traceability and third-party NDT upon request. Sizes available from M3 to M100 (1/4" to 4") in all standard configurations.

Why RAYCHIN LIMITED – The 310 Stainless Steel Fastener Authority

Metallurgical competence

Engineers on staff with deep expertise in high-temperature stainless steels. We ensure proper solution annealing (1040°C minimum) and rapid quenching for optimal corrosion resistance and mechanical properties across all 310 stainless steel bolts, nuts, screws, washers, stud bolts & threaded rods. Every heat is verified by in-house testing and PMI verification.

Global approvals & traceability

Our quality system is ISO 9001:2015 and AS9100D certified; we also comply with NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN and KS. Full material traceability from melt to final packaging (EN 10204 3.1/3.2). Third-party inspections (ABS, DNV, Lloyds) available.

Extensive inventory & rapid delivery

We stock 310 stainless steel hex bolts (M6–M100), heavy hex nuts, flat washers, and continuous thread rods in various sizes. Emergency services for shutdowns with 24/7 support. Same-day quoting and rapid global shipping.

Custom solutions

Need a special thread combination, unusual length, or custom head configuration for your high-temperature application? Our CNC turning and thread rolling departments handle short runs with agility. We also provide specialized coatings and high-temperature testing per customer requirements.

Contact the 310 stainless steel fastener experts today

Request a quote for 310 stainless steel bolts, nuts, screws, washers, stud bolts & threaded rods – any global standard (NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS), any quantity. Inquire about high-temperature applications up to 1150°C.

sales@ray-chin.com | +86 534 2166 566

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