A286 Bolts

A286 / Alloy 660 (1.4980) for excellent high temperature oxidation resistance

• Excellent high temperature oxidation resistance to 1300°F / 700°C
• Maintains high strength at elevated temperatures
• Specs & heat treatments
• A286 Chemistry
• ASTM A453 Grade 660 and ASTM F2281
• Cryogenic Properties of A286
• A286 Datasheet

A286 (1.4980) bolts, also known as Alloy 660 bolts are stainless steel alloy which contains iron, nickel and chromium. A286 bolts are known for their high strength, creep resistance and oxidation resistance at elevated temperatures once age hardened.  As a result, A286 bolts provide high levels of strength from room temperature up to about 1300°F (700°C).

A286 bolts are also mildly corrosion resistant. While they should not be used for strong acid environments, they provide excellent oxidation resistance up to 1500°F (815°C) in conditions that would typically be found in high temperature exhaust streams.

Cryogenic Capabilities
A286 bolts are not only usable for high temperatures, it can also be used for subzero applications. Since it remains ductile at cryogenic temperatures, it can be a good choice for non-magnetic strength down to around -320°F. Click here to view a chart on the mechanical properties of A286 bolts at cryogenic temperatures

Applications
Because of the properties of Alloy 660 / A286, these bolts are often found in high temperature engine, manifold, exhaust and turbine applications as well as off-shore oil & gas applications. In addition, A286 / Alloy 660 is also non-magnetic and finds a niche in non-magnetic cryogenic equipment. Extreme Bolt & Fastener also provides A286 to ASTM A453 Grade 660 specification. This specification ensures accurate standards for tensile and stress rupture properties, which is critical for many high temperature applications.

Resources: A286 Torque Specs

Bolt Types Available: Hex Bolts, Shoulder Bolts

ASTM A453 Grade 660

Material specification ASTM A453 Grade 660 applies to bolts, studs, nuts and other fasteners. It ensures fasteners meet strength standards for use in high temperature bolting applications. ASTM A453 Grade 660 is classified into 4 property classes / heat treatments: A, B, C & D, each designated with different tensile and stress rupture properties. The most common of the ASTM 453 classes are class A or D. The grades A, B and C all have the same minimum tensile strength and minimum yield strength of 130ksi and 85ksi respectively. However grade D has a significantly better yield with a min tensile of 130ksi and a min yield of 105ksi.

Additional A286 / Alloy 660 Specifications, Cold Working & Heat Treatments

AMS A286 / Alloy 660 Heat Treatments

By AMS numbers, the most common for A286 / Alloy 660 is AMS 5737 (same as Grade A) and then AMS 5732 (same as Grade B).

A286 / Alloy 660 Cold Worked Fasteners

For additional strength, A286 could be aged and cold worked to achieve a min ultimate tensile strength of 160ksi upon request.

Additional Specifications

UNS S66286, ASTM A453, AMS 5525, AMS 5726, AMS 5732, AMS 5737, AMS 5804, EN 1.4980, GE B50T1181, GE B50T12, GE B50T81, Werkstoff 1.4980, ASTM F2281

A286 / Alloy 660 Chemistry

Mechanical Properties

A286 Hex Head Bolts

A286 / Alloy 660 for excellent high temperature oxidation resistance

• Good material for high temperature oxidation resistance
• Maintains high strength at elevated temperatures
• Material specifications & heat treatments
• A286 chemistry
• ASTM A453 Grade 660
• A286 Datasheet

A286 bolts, also known as Alloy 660 bolts are stainless steel alloy which contains iron, nickel and chromium. A286 hex bolts are known for their high strength, creep resistance and oxidation resistance at elevated temperatures once age hardened.  As a result, A286 hex bolts provide high levels of strength from room temperature up to about 1300°F (700°C).

A286 hex head bolts are also mildly corrosion resistant. While they should not be used for strong acid environments, they provide excellent oxidation resistance up to 1500°F (815°C) in conditions that would typically be found in high temperature exhaust streams.

Applications

Because of the properties of Alloy 660 / A286, these hex bolts are often found in high temperature engine, manifold, exhaust and turbine applications as well as off-shore oil & gas applications. In addition, A286 / Alloy 660 is also non-magnetic and finds a niche in non-magnetic cryogenic equipment. Extreme Bolt & Fastener also offers A286 fasteners to meet ASTM A453 Grade 660 specification. This ensures specific tensile strengths and rupture properties, which are critical for many high temperature specifications.

Resources: A286 Torque Specs

Bolt Types Available: Hex Bolts, Shoulder Bolts

A286 / Alloy 660 Hex Head Bolt Features and Benefits

It is important to differentiate between a -286 hex head bolt and hex head cap screw. Often people assume they are the same, but they are actually very different fasteners in terms of how they are manufactured, as well as from an application perspective. Regardless of your choice, A286 / Alloy 660 hex heads offer strong, stable joints because of their large head service. 

The Hex Comparison

ASTM A453 Grade 660

Material specification ASTM A453 Grade 660 applies to bolts, studs, studs and other fasteners. It ensures fasteners meet strength standards for use in high temperature bolting applications. ASTM A453 Grade 660 is classified into 4 property classes / heat treatments: A, B, C & D, each designated with different tensile and stress rupture properties. The most common of the ASTM 453 classes are class A or D. The grades A, B and C all have the same minimum tensile strength and minimum yield strength of 130ksi and 85ksi respectively. However grade D has a significantly better yield with a min tensile of 130ksi and a min yield of 105ksi.

Additional A286 / Alloy 660 Specifications, Cold Working & Heat Treatments

AMS A286 / Alloy 660 Heat Treatments

By AMS numbers, the most common for A286 / Alloy 660 is AMS 5737 (same as Grade A) and then AMS 5732 (same as Grade B).

A286 / Alloy 660 Cold Worked Fasteners

For additional strength, A286 could be aged and cold worked to achieve a min ultimate tensile strength of 160ksi upon request.

Additional Specifications

UNS S66286, ASTM A453, AMS 5525, AMS 5726, AMS 5732, AMS 5737, AMS 5804, EN 1.4980, GE B50T1181, GE B50T12, GE B50T81, Werkstoff 1.4980, ASTM F2281

A286 / Alloy 660 Chemistry

Mechanical Properties

A-286 Flanges

 Alloy 660 with excellent high temperature oxidation resistance

• Good material for high temperature oxidation resistance
• Maintains high strength at elevated temperatures
• A286 Chemistry, specs, and heat treatments

A-286 flangesor Alloy 660 are known for their high strength, creep resistance and oxidation resistance at elevated temperatures. This iron-nickel-chromium alloy (once age-hardened) provides A-286 flanges with high levels of strength from room temperature up to about 1300°F (700°C).

A-286 flanges are mildly corrosion resistant. While they should not be used for strong acid environments, they provide excellent oxidation resistance up to 1300°F (700°C) in conditions that would typically be found in high temperature exhaust streams.

Because of the properties of Alloy 660, A-286 flanges are often found in high temperature engine, manifold, exhaust and turbine applications as well as off-shore oil & gas applications.

Resources: A-286 Torque Specs, Flange Dimensions, Flange Bolting Chart

Flange Types Available: Blind Flanges, Lap Joint Flanges, Slip On Flanges, Socket Weld Flanges, Threaded Flanges, Weld Neck Flanges

A-286 Chemistry, Specifications & Heat Treatments

A-286 Heat Treatments:  There are several heat treatment combinations for A-286 all with slight variations in performance. They can be specified via an AMS number or a 660 Class: A, B, C or D,  with most common specified as class A or D.   The A-286 grades A, B and C all have the same min tensile strength and min yield strength of 130ksi and 85ksi respectively. However grade D is significantly better yield with a min tensile of 130ksi and a min yield of 105ksi. 

By AMS numbers, the most common for A-286 is AMS 5737 (same as Grade A) and then AMS 5732 (same as Grade B). 

A-286 Specifications: UNS S66286, AMS 5525, AMS 5732, AMS 5737, AMS 5804, EN 1.4980, GE B50T1181, GE B50T12, GE B50T81, Werkstoff 1.4980

Mechanical Properties

A-286 Lap Joint Flanges

 A Fe-Ni-Cr alloy with excellent high temperature oxidation resistance

• Good material for high temperature oxidation resistance
• Maintains high strength at elevated temperatures
• A286 Chemistry, specs and heat treatments
• Lap joint flange features and benefits

A-286 lap joint flanges are known for their high strength, creep resistance and oxidation resistance at elevated temperatures. This iron-nickel-chromium alloy (once age-hardened) provides A-286 lap joint flanges with high levels of strength from room temperature up to about 1300°F (700°C).

A-286 lap joint flanges are mildly corrosion resistant. While they should not be used for strong acid environments, they provide excellent oxidation resistance up to 1300°F (700°C) in conditions that would typically be found in high temperature exhaust streams.

Because of these properties, A-286 lap joint flanges are often found in high temperature engine, manifold, exhaust and turbine applications as well as off-shore oil & gas applications.

Resources: A-286 Torque Specs, Flange Dimensions, Flange Bolting Chart

Flange Types Available: Blind Flanges, Lap Joint Flanges, Slip On Flanges, Socket Weld Flanges, Threaded Flanges, Weld Neck Flanges

A-286 Chemistry, Specifications & Heat Treatments

A-286 Heat Treatments:  There are several heat treatment combinations for A-286 all with slight variations in performance. They can be specified via an AMS number or a 660 Class: A, B, C or D,  with most common specified as class A or D.   The A-286 grades A, B and C all have the same min tensile strength and min yield strength of 130ksi and 85ksi respectively. However grade D is significantly better yield with a min tensile of 130ksi and a min yield of 105ksi. 

By AMS numbers, the most common for A-286 is AMS 5737 (same as Grade A) and then AMS 5732 (same as Grade B). 

A-286 Specifications: AMS 5525, AMS 5732, AMS 5737, AMS 5804, EN 1.4980, GE B50T1181, GE B50T12, GE B50T81, UNS S66286, Werkstoff 1.4980

Mechanical Properties

A286 Lap Joint Flange Features & Benefits

Lap joint flanges are unique in that they are made of two pieces, the flange itself and the stub end.

Flange

• The backside, has a slight shoulder that is square cut at the center or pipe hole
• The front side has a flat face with a filleted (rounded) center hole to match the filleted back face of the stub end. Here the stub end will wrap tightly around the center hole of the flange.

Stub End

• Shaped like a short piece of pipe with a weld bevel on one. This portion of the stub end is also called the sleeve.
• Narrow shoulder on the flange facing end called is the hub. The back face of the hub has a rounded transition (or inside fillet) that joins the hub to the sleeve

Benefits

• Economy 
  Because a lap joint flange has a two piece configuration, it offers a way to cut cost when piping systems requires 
• For high cost alloys the only "wetted" part is the stub end. In this situation, it is only required for the stub-end to be made of the higher cost corrosion-resistant material, where the flange itself can be the produced from lower cost steel.
• Ease of Work
  By using lap joint flanges, work can be simplified in situations that require frequent and rapid disassemble and assembly during the operation of a plant. The ability to spin that backing flange compensates for misalignment of the bolt holes during assembly.