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No. Product form, size, condition, quantity, manufacturing route, inspection and schedule are reviewed for each enquiry.

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No. Comparison is a screening aid. Substitution requires review against the service conditions, governing specifications, design authority and purchase documents.

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Send the drawing or standard, size/thread, quantity, material specification and condition, service context, inspection/documents, target date and destination.

A286 Fasteners & Material Data | A-286 / UNS S66286

What is A-286 and its applications?

A-286 (UNS S66286), also known as Alloy 660, is a precipitation-hardening iron-nickel-chromium alloy. It is used in jet-engine components and high-temperature fasteners where strength, ductility and resistance to the service atmosphere must be considered together.

Jet engines: Turbine wheels, blades, casings and afterburner parts.
High-temperature hardware: Fasteners selected against a defined thermal and mechanical duty.
Engine structures: Frames and associated components requiring a controlled heat-treatment condition.

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Engineering Application & Selection Guide

Aging develops strengthening precipitates in an austenitic matrix. Solution treatment and aging must be tied to the specified product requirements; a raw-material grade description is not a substitute for a finished-bolting class.

A-286 stud bolts — For Grade 660 bolting, identify the governing specification, class and size. Confirm the required properties after the complete manufacturing sequence.
A-286 hex bolts — For exhaust-system connections, evaluate differential thermal expansion and clamp-load changes through the operating cycle.
A-286 socket head cap screws — For confined hot assemblies, state head geometry, thread requirements and long-term relaxation criteria.

When comparing A-286 and Inconel 718 fasteners, use condition-specific creep, relaxation and allowable-stress data for the actual design temperature and life. There is no universal changeover temperature between the two alloys.

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A-286 Composition

Composition limits · wt.%

ElementWeight %

Cr: 13.5–16%
Ni: 24–27%
Mo: 1.0–1.5%
Ti: 1.90–2.35%
V: 0.10–0.50%
B: 0.001–0.010%
Al: ≤0.35%
C: ≤0.08%
Mn: ≤2.0%
P: ≤0.04%
S: ≤0.03%
Si: ≤1.0%

ASTM / ASME specifications by product form

Finished-product requirements

Product	Reference
Grade 660 bolting	ASTM A453/A453M · specify the class, size range and applicable edition

A-286 hex bolt requirements ↗

Fasteners · dimensional references

Product	Reference
Hex bolts	ISO 4014 / ISO 4017 · ASME B18.2.1
Threaded studs	DIN 976-1 · ASME B18.31.2
Hex nuts	ISO 4032 · ASME B18.2.2
Socket head screws	ISO 4762 · ASME B18.3
Flat washers	ISO 7089 / ISO 7090 · ASME B18.21.1
Custom fasteners	Customer drawing

Raw-material specifications

Product form / scope	Reference
Sheet & strip	AMS 5525 / 5858

Dimensions do not define material or finished-part compliance. Specify the grade, condition and applicable requirements.

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A-286 Mechanical Properties

Reference sample and condition

Data basis: Catalogue reference minimums
Condition: Grade 660 · Class A / B / C reference
Gauge length: A5, as labelled in supplied table

Key properties	Value
Tensile strength	≥895 MPa
0.2% yield strength	≥585 MPa
Elongation	≥15%

Supplied technical reference · Scanned PDF page 7 · printed page 19

Procurement and application guide

Specify the material and final condition

For Grade 660 bolting, state the required class and size.

Material forms in the technical reference: Bar · Billet · Plate · Sheet · Strip.

Define the finished-part acceptance

Include the material or bolting specification, required final condition, dimensions and quantity. State the service medium, temperature and loading where known. Agree the required tests, inspection coverage and acceptance criteria for the finished part.

Start with the information you have

Send a drawing or share the product form and dimensions. Identify any undecided requirements for review rather than copying a typical property value into the purchase order.

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