Stainless Steel High Temperature Nut Manufacturer in India
Unifit Fastener is a trusted manufacturer and supplier of stainless steel high temperature nuts that have been designed to provide reliable performance in environments that are subjected to either constant or variable heat levels. These nuts are made of the best stainless steel alloys, and thus they remain highly strong, hard, and stable even when they are exposed to extreme temperatures. They are common in power plants, petrochemical plants, industrial furnaces, automotive systems, and any other area where heat resistance is paramount.
Unifit Fastener manufactures these SS high temperature nuts in an extensive selection of grades, such as ASTM A194 GR.8, GR.8 CL 1, GR.8 CL 2, GR.8M, GR.8M CL 1, GR.8M CL 2, GR.8C, GR.6, GR.8T, GR.8S Hex Nuts. These specifications guarantee high performance in terms of mechanical behavior, anticorrosion, and high lifespan in high temperatures.
These nuts are constructed to resist oxidation and scaling, as well as thermal degradation, which is of great use compared to the conventional fasteners that tend to loosen or deform when stressed by heat. Every nut is threaded and surface finished to a high standard to ensure smooth fitting and joint formation. They also improve the more rigorous industrial conditions in that they are compatible with high-temperature bolts and other specialty fasteners.
These fasteners are available in many different configurations, such as hex nuts, lock nuts, and custom machined, as they offer reliable load support and vibration resistance. They are necessary to ensure safety and stability of operation by their ability to withstand thermal expansion and mechanical pressure.
Unifit Fastener offers stainless steel high temperature nuts, which contain high-quality material, tight quality control, and a variety of different ASTM A194 grades to provide the best assurance in the harshest environments.
Request QuoteTable of Contents
- What are Stainless Steel High Temperature Nuts?
- Specification of Stainless Steel High Temperature Nuts
- Send Your Enquiry
- Weight Chart Of Stainless Steel High Temperature Nuts
- Chemical Composition of SS High Temperature Nuts
- Applications of Stainless Steel High Temperature Nuts
- FAQs about Stainless Steel High Temperature Nuts
What are Stainless Steel High Temperature Nuts?
Stainless steel high-temperature nuts are specialized fasteners made from heat-resistant austenitic stainless steel grades such as 309, 310, 321, and 347. These alloys are designed to maintain strength, resist oxidation, and prevent embrittlement when exposed to temperatures above 800°F and even beyond 1000°F (426°C–538°C+). Their stability under extreme heat makes them essential for aerospace systems, automotive exhaust components, industrial furnaces, and petrochemical equipment. Enhanced with stabilizing elements like titanium or niobium, these nuts deliver long-term durability, ensuring secure fastening and reliable performance where standard fasteners fail.
Grades of SS High Temperature Nuts
Specification of Stainless Steel High Temperature Nuts
| Specification | Details |
|---|---|
| Available Grades | 201, 304, 304L, 304H, 305, 310, 310S, 310H, 316, 316L, 316Ti, 317, 317L, 321, 347, 347H, 309S, 410, 446, along with custom high-temperature alloy options |
| Standards Followed | ANSI/ASME B18.2.2, ASTM A194, or comparable international standards |
| Size Range | Metric: M3–M100 & Imperial: 1/8"–4" (special dimensions available upon request) |
| Hardness Rating | Rockwell B scale: typically RB 80–100 depending on material grade |
| Surface Finishes | Passivated, black oxide finish, or specialized heat-resistant protective coatings |
| Temperature Capacity | Withstands up to approx. 1,200°F (650°C), varying according to alloy composition |
| Tensile Strength | Generally ≥ 70,000 psi (485 MPa), influenced by grade and heat treatment |
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Weight Chart Of Stainless Steel High Temperature Nuts
| Nut Size (Metric) | Approx. Weight (g) | Approx. Weight (oz) |
|---|---|---|
| M6 | 6.5 | 0.23 |
| M8 | 10.5 | 0.37 |
| M10 | 15.5 | 0.55 |
| M12 | 20.0 | 0.71 |
| M16 | 35.0 | 1.24 |
| M20 | 50.0 | 1.76 |
| M24 | 80.0 | 2.82 |
| M30 | 130.0 | 4.59 |
| M36 | 200.0 | 7.05 |
| M42 | 300.0 | 10.58 |
| M48 | 400.0 | 14.11 |
Chemical Composition of SS High Temperature Nuts
| Grade | C (%) | Mn (%) | P (%) | S (%) | Si (%) | Cr (%) | Ni (%) | Mo (%) |
|---|---|---|---|---|---|---|---|---|
| 304* | ≤ 0.08 | ≤ 2.00 | ≤ 0.045 | ≤ 0.030 | ≤ 1.00 | 18.00–20.00 | 8.00–10.50 | – |
| 304L* | ≤ 0.03 | ≤ 2.00 | ≤ 0.045 | ≤ 0.030 | ≤ 1.00 | 18.00–20.00 | 8.00–12.00 | – |
| 316* | ≤ 0.08 | ≤ 2.00 | ≤ 0.045 | ≤ 0.030 | ≤ 1.00 | 16.00–18.00 | 10.00–14.00 | 2.00–3.00 |
| 316L* | ≤ 0.03 | ≤ 2.00 | ≤ 0.045 | ≤ 0.030 | ≤ 1.00 | 16.00–18.00 | 10.00–14.00 | 2.00–3.00 |
| 321 | ≤ 0.08 | ≤ 2.00 | ≤ 0.040 | ≤ 0.030 | ≤ 1.00 | 17.00–19.00 | 9.00–12.00 | 0.75 |
Applications of Stainless Steel High Temperature Nuts
- Aerospace Engines & Components: Used in turbine housings, exhaust systems, and high-heat structural assemblies due to their stability at extreme temperatures.
- Automotive Exhaust & Turbo Systems: Ideal for manifolds, catalytic converters, turbochargers, and heat shields where continuous thermal exposure is common.
- Power Generation Plants:Widely used in boilers, turbines, heat exchangers, and high-pressure steam systems.
- Petrochemical & Refinery Equipment:Suitable for reactors, cracking units, furnaces, and high-temperature pipelines.
- Industrial Furnaces & Heating Units:Provide secure fastening for kiln linings, burners, and thermal processing machinery.
- Oil & Gas Processing:Used in flare stacks, hot pipelines, and high-temperature drilling equipment.
- Thermal & Chemical Processing Plants:Excellent for equipment exposed to aggressive chemicals and elevated temperatures.
- Food & Pharmaceutical Machinery:Preferred in sterilization systems and high-heat cleaning operations due to corrosion resistance.
- Marine & Offshore Applications:Work well in ship exhaust systems and high-temperature engine rooms.
- Heavy Engineering & Fabrication: Utilized in welding fixtures, heat-treatment assemblies, and high-stress structural components.
FAQs about Stainless Steel High Temperature Nuts
What are stainless steel high temperature nuts?
These are specialized fasteners designed to maintain strength, resist oxidation, and stay stable when exposed to extreme heat, typically above 800°F (426°C).
Which stainless steel grades are used for high-temperature nuts?
Common grades include 309, 310, 321, 347, and high-strength variants like 304H, 316H, and custom heat-resistant alloys.
Where are high-temperature nuts commonly used?
They are widely used in aerospace engines, automotive exhaust systems, power plants, refineries, furnaces, and industrial heating equipment.
What is the difference between 304H, 316H, and other high-temperature grades?
High-temperature variants like 304H and 316H contain higher carbon content, improving strength and creep resistance at elevated temperatures compared to standard grades.