A286 Vented Screws

A286 / Alloy 660 for excellent high temperature oxidation resistance

• Good material for high temperature oxidation resistance
• Maintains high strength at elevated temperatures
• A-286 chemistry, specs & heat treatments
• Venting for vacuum applications
• A286 Datasheet

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

A286 vented screws 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 vented screws 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.

Resources: A286 Torque Specs

Screw Types: 12 Point Screws, Button Head Cap Screws, Flat Head Screws, Hex Cap Screws, Pan Head Screws, Set Screws, Socket Head Cap Screws, Tamper Resistant Security Screws, Torx Screws

A286 / Alloy 660 Vented Screw Features & Benefits

A286 vented screws are ideal for use in high vacuum (UV) and ultra high vacuum (UHV) equipment, as well as other high pressure environments and applications where gas pockets can form. Center vented screws have a center bore drilled through their axis from the head through the threaded shank of the screw. This feature provides an outlet for the complete evacuation of trapped air and gas contaminants to be pumped away from blind-tapped screw holes, bottoms, sides and shoulders. In addition to vented screws, washers with vent grooves can be made to ensure the venting of the cavity found under the screw head.

A286 / Alloy 660 Vented Screws Benefits
• Enables faster, more efficient pump-down of HV & UHV systems
• Eliminates virtual leaks
• Relieves pressure from blocked gases
• Provides means to vent contaminants found in screw voids
• Promotes higher system throughput and improved yield
• Allows for constant pressure and temperature equalization

A286 Vented Screws Are Available In:
•  Socket Head Cap Screw
•  Hex Head Cap Screw

What is a vented washer?
When a screw is tightened over a flat washer, or directly an application without a washer, volumes of gas can be trapped in the space and beneath the fastener head along the screw shaft. Vented washers feature two bored canals on opposite sides of the flat face which provide an escape route for trapped gases.  

What is a virtual leak?
A virtual leak is comprised of gases that are trapped physically within a pocket with only a miniscule escape path from the trapped pocket of gas into the chamber proper.

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

A-286 / Alloy 660 Heat Treatments:  There are several heat treatment combinations for A-286 (Alloy 660) all with slight variations in performance. They can be specified via an AMS number or Class: A, B, C or D,  with most common specified as 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. 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: For additional strength, A286 could be aged and cold worked to achieve a min ultimate tensile strength of 160ksi upon request

A286 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

Mechanical Properties

A286 Pan Head Screws

A286 / Alloy 660 for excellent high temperature oxidation resistance

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

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

A286 pan head screws 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 pan head screws 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.

Resources: A286 Torque Specs

Screw Types: 12 Point Screws, Button Head Cap Screws, Flat Head Screws, Hex Cap Screws, Pan Head Screws, Set Screws, Socket Head Cap Screws, Tamper Resistant Security Screws, Torx Screws, Vented Screws

A286 / Alloy 660 Pan Head Screw Features and Benefits

Pan head screws are flat on top and rounded on the sides. A286 pan head screws are ideal for:

• Small diameter fasteners – especially when the fastener size needed is too small for a wrench.
• When phillips or slotted drivers are desired. For many high strength specialty alloys, only slotted drives are available.
• Low torque applications because the drivers don’t offer as much force as a wrench.
• Large diameter head provides more clamping area.

How Are They Different from Button Head Screws?
A286 / Alloy 660 pan head and button head screws have very similar profiles however, button head screws allow for a hex socket driver whereas pan head screws do not.

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

A286 Torx Screws

A286 / Alloy 660 for excellent high temperature oxidation resistance

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

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

A286 torx screws 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. For the most critical applications, we offer bolts screws per ASTM A453 Grade 660. This ensures tensile and rupture properties.

Applications

Because of the properties of Alloy 660 / A286  these torx screws 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.

Resources: A286 Torque Specs

Screw Types: 12 Point Screws, Button Head Cap Screws, Flat Head Screws, Hex Cap Screws, Pan Head Screws, Set Screws, Socket Head Cap Screws, Tamper Resistant Security Screws, Torx Screws, Vented Screws

A286 / Alloy 660 Torx Screw Features and Benefits

A286 Torx screws are characterized by a 6-point star-shaped pattern, also called a star drive, spined socket or hexalobular (ISO 10664). Where Phillips heads were designed to cause the driver to cam-out (prevent overtightening), Torx screws were designed resist cam-out. This feature allows A286 / Alloy 660 torx screws to provide increased torque as well as better torque transfer between driver and fasteners. This feature also helps to reduce wear on driver bits.

Alloy 660 / A286 Torx Screw Advantages

• Resistant to cam out (process by which a screwdriver slips out of the head)
• A286 Torx screws are more difficult to strip
• Increased tamper resistance as a star driver isn’t as common
• Driver insert is less susceptible to damage when over torqued than Allen head

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 Button Head Cap Screws

 Alloy 660 stainless steel 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
• A286 button head cap screw features and benefits

A286 button head cap screws or alloy 660 stainless steel button head cap screws are known for their high strength, creep resistance and oxidation resistance at elevated temperatures. This iron-nickel-chromium alloy (once age-hardened) provides A286 screws with high levels of strength from room temperature up to about 1300°F (700°C).

A286 button head cap screws 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, A286 button head cap screws are often found in high temperature engine, manifold, exhaust and turbine applications as well as off-shore oil & gas applications.

Resources: A286 Torque Specs

Screw Types: 12 Point Screws, Button Head Cap Screws, Flat Head Screws, Hex Cap Screws, Pan Head Screws, Set Screws, Socket Head Cap Screws, Tamper Resistant Security Screws, Torx Screws, Vented Screws

A286 Button Head Cap Screw Features & Benefits

A286 button head cap screws combine the similar shape of a pan head with the driver of a socket head. The socket driver is ideal for low clearance applications that require a large area clamping face. Compared to a standard socket head cap screw, A286 button heads have a lower and wider profile. This can be useful when the clamping material is too thin to counter-bore.

Advantages

• Wide bearing surface for clamping
• Low profile head

A286 Chemistry, Specifications & Heat Treatments

A286 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). 

A286 Specifications: ASTM A453, AMS 5525, AMS 5732, AMS 5737, AMS 5804, EN 1.4980, GE B50T1181, GE B50T12, GE B50T81, UNS S66286, Werkstoff 1.4980

Mechanical Properties