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Alloy A-286

Delta Fastener Corp. can provide a wide variety of A286 fasteners including; A286 nuts, A286 bolts, A286 sockets, washers and more A286 Fasteners. If we do not have your A286 Fasteners in stock (Inch or Metric) we can have these manufactured to your specification.

Material Notes:

Alloy A286 is a precipitation hardenable alloy, which is used extensively in the petro-chemical, aerospace and oil field industries, especially for fasteners, stud-bolts.

The mechanical properties detailed are typical of most oil-field equipment companies requirements. The main difference between these figures and the properties of ASTM A638 Grade 660 is that the 0.2% offset yield strength is increased from 85,000 psi up to 105,000 psi.

To obtain this a secondary precipitation treatment is often necessary. The maximum hardness figure of 35 HRC is from NACE MR-01-75 and differs from ASTM A638 grade 660 which is 248 HBN minimum. Alloy A-286 is also used for extrusion liners and dies.

National Specification

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ASTM UNS SEA AMS British Standard Werkstoff


Grade 660B

Grade 660D

S66286 5731


HR 52/650 1.4943


Technical Data

Nominal Composition by Percent

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C Mn Si P S Cr Ni Mo Ti Al V B Cu Fe -
Min - - - - - 13.0 24.0 1.0 1.9 - 0.1 .001 - Bal %
Max 0.08 2.0 1.0 0.40 0.30 16.0 27.0 1.5 2.35 0.35 0.5 .010 0.30 - %

Typical Mechanical Properties (Oil patch)

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Solution Annealed & Precipitation Treated(Aged) KSI MPa %
Tensile Strength, min 145,000 1000 -
Yield Strength (0.2% offset), min 105,000 724 -
Elongation in 2" (or 50mm) or 4D, min - - 15
Reduction of Area - - 25
Hardness(Rockwell) 24-37 - -

Disclaimer: The dimensions listed are for reference only. Sizes not listed may be available off the shelf or can be manufactured to customer requirements.

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