Typical MOQ
10pieces
Subject to product and material review.
Conditions
MOQ is typically 10 pieces, subject to product, material and manufacturing-route review.
A-286 Hex Bolts — ASTM A453/A453M Grade 660
MaterialA-286Change · 45 grades
A286 / A-286 hex head bolts in UNS S66286. Send a drawing or define the diameter, under-head length, thread and quantity. For an ASTM A453/A453M Grade 660 order, include the required class, edition and final condition.
- Material
- A-286 · UNS S66286 · Alloy 660
- Material focus
- High-temperature strength
- Common applications
- High-temperature bolting · turbine components
- Main elementsComposition limits · wt.%
- Ni 24–27%
- Cr 13.5–16%
- Ti 1.90–2.35%
- Mo 1.0–1.5%
Standards & threads
Finished boltASTM A453/A453M Grade 660 / ASTM F2281Bolting specification · Grade 660; alternative F2281 Type III Class B
For A453, select Class A, B, C or D and include A962/A962M. F2281 is a separate inch route; its condition designations are not A453 class names.
Specify one governing route and its edition. A453 class selection and F2281 AH1 / AH2 / AH3 treatment conditions must not be mixed as equivalent labels.
Raw material specificationASTM A638/A638M Grade 660UNS S66286
S66286 · bar, forgings and forging stock
Specify stock condition and heat treatment; an A638 stock certificate is separate from finished bolting acceptance.
Dimensions · metricISO 4014 / ISO 4017Coarse pitch · partial-thread bolts / full-thread hex screws
Dimensions · inchASME B18.2.1Inch hex bolts / hex cap screws
Select the bolt or cap-screw pattern, head dimensions and thread length. Hex and heavy hex are different choices.
Threads · metricISO 261 / ISO 965-1Metric M · pitch plan and tolerance system
Threads · UNC / UNFASME B1.1Unified inch · coarse / fine series
State diameter, TPI, series and external class: e.g. 1/2-13 UNC-2A or 1/2-20 UNF-2A. Select 2A / 3A with the mating-thread fit; UNC and UNF do not mate.
Sources & editions Reviewed 2026-10-19
Historical samples support the stated grade coverage. The ordered edition controls the full requirements.
Preview your dimensions
Example dimensions, not a stock size.
Simplified right-hand thread appearance. No tolerance, fit or standard compliance is simulated.
Head dimensions · optional
Head proportions are illustrative: s = 1.5d, k = 0.625d. They are not standard-table values and will not be submitted as specified dimensions.
Quality documents
Heat number traceability
Every delivery traceable by heat number
Mechanical testing
Included with every delivery
Thread inspection
GO / NO-GO gauging · sampled inspection
Methods, sampling and acceptance criteria follow the agreed specification. PMI, third-party inspection and additional records are agreed separately.
Before production and at delivery
During quotation, a redacted certificate from a previous order can show the document format and recorded tests. It is a historical example, not certification of this product or a new order. Shipment documents must correspond to the material and batch actually supplied.
How to read a historical certificate sample ↗Prepare your enquiry
Send a drawing and quantity.
No drawing? Use these details.
- Size
- d × L Diameter × under-head length
- Quantity
- Pieces Required quantity per size
- Thread
- Metric / UNC / UNF Pitch or TPI + thread class
- Coverage
- Full / Partial For partial, include threaded length
Full material checklist
Grade 660 class
When ASTM A453/A453M is the governing route, state its edition, Grade 660, Class A / B / C / D, and nominal bolt size. If no class has been selected, identify that point for review.
Class and size determine which requirements apply; do not leave the class implicit.
Geometry & mating thread
Hex head pattern, diameter, under-head length, thread length, Metric / UNC / UNF and external-thread class.
A bolting material specification does not replace the part drawing or thread callout.
Condition & required records
Final material condition, heat-treatment records, required mechanical tests and heat / lot traceability.
The certificate package must support the class ordered, not merely state “A286”.
Example enquiry — adapt to your drawing
Please quote A286 hex bolts (A-286), UNS S66286, to drawing [number/revision], or diameter [value/unit] × under-head length [value/unit], quantity [pieces per size]. Thread: [designation/class]; coverage: [full/partial]; for partial threading, threaded length [value/unit]. If the drawing requires ASTM A453/A453M Grade 660, the class is [A/B/C/D] and the ordered edition is [year]. Please identify the final material condition, applicable size-dependent acceptance requirements and lot-linked inspection records.
Replace the brackets with your requirements, or send your drawing instead. If a condition or specification is undecided, flag it for review. This is an enquiry example; dimensions, availability, price and acceptance requirements are confirmed in the quotation and purchase documents.
Commercial terms
Indicative terms; confirmed in your quotation.
Sample review
~20days
Freight, import duties and taxes are separate.
Conditions
Samples are typically reviewed on an approximately 20-day basis. BYBOLT may cover agreed sample manufacturing; buyer freight, import duties and taxes remain separate.
Production review
25–35days
Urgent requirements can be discussed.
Conditions
Regular production is commonly reviewed on a 25–35 day basis. Urgent requirements can be discussed against the complete specification.
Typical deposit
30%
T/T or LianLian. Balance before dispatch.
Conditions
Payment can be arranged by T/T or LianLian. A typical order uses a 30% deposit, with the balance completed before dispatch.
Technical help
Is Grade 660 alone a complete A286 bolt callout?
For the A453/A453M route, also identify Class A, B, C or D, the edition and applicable A962/A962M requirements. The class and bolt size affect acceptance. A638 Grade 660 identifies a separate starting-stock route.
Can F2281 AH1, AH2 or AH3 replace an A453 class?
Keep the condition system belonging to the governing specification. F2281 Type III Class B is a separate inch route; its AH condition labels are not A453 Classes A–D. State one governing route and its treatment and testing requirements.
Can I request these bolts without a drawing?
Yes. Start with diameter, under-head length, thread designation and quantity per size. Add full or partial threading and the specified material condition. We review any missing drawing or acceptance details before the order is confirmed.
Read a thread designation Metric / UNC / UNF
M12 × 1.75–6g12 mm diameter · 1.75 mm pitch · external class 6g
1/2-13 UNC-2A1/2 inch · 13 TPI · coarse · external class 2A
1/2-20 UNF-2A1/2 inch · 20 TPI · fine · external class 2A
Examples explain designations, not available sizes. Specify fine pitch explicitly. UNC and UNF do not mate; full or partial threading is a separate choice.
Thread classes and inspection ↗Related material guides
A286 identifies the alloy; Grade 660 needs a class
A286 is an age-hardenable iron-nickel-chromium alloy. If ASTM A453/A453M Grade 660 is required, add Class A, B, C or D and the applicable edition. The UNS designation alone does not establish compliance with a particular Grade 660 class.
A286 material identity & Grade 660 references ↗Keep heat-treatment and inspection records connected
Specify the final condition and the class- and size-dependent acceptance requirements. Request traceable heat-treatment and mechanical test records for the supplied lot. A material identification result confirms neither the full heat-treatment history nor all finished-fastener properties.
Material certificates, PMI & inspection scope ↗Download the PO and receiving checklist (PDF)
Guides for your enquiry
Specify your A-286 bolt
Send a drawing or add your dimensions and quantity.
Continue to enquiry ↗
Combine several products in one enquiry
A-286 hex boltsEnquire ↗