NAS6703 through NAS6720 A286 close-tolerance bolts, long thread
The A286 close-tolerance airframe bolt with a long thread, 160 ksi, .190-32 through 1.250-12 UNJF-3A.
NAS6703–NAS6720, machined to the standard.
NAS6703 through NAS6720 is the A286 long-thread close-tolerance hex head bolt, the corrosion and heat resistant counterpart of NAS6603. Material is A286 (UNS S66286) to the chemistry of AMS 5731, 5732, 5737 or 5853, heat treated to 160 ksi minimum tensile, with cadmium plated, aluminum coated and passivated finish codes. The standard is active; AIA issued revision 13 in April 2026.
- Machined from certified bar to the standard; no hot heading
- AS9100D and ISO 9001:2015 quality system; CAGE 8HH90
- DFARS-compliant material available on request
- No minimum quantity; prototype through production
- Material test reports and certificates of conformance with the order
Send the full part number with the dash number and code letters, the quantity, the required delivery and the documentation your purchase order calls for.
NAS6703–NAS6720 at a glance
| Detail | Specification |
|---|---|
| Standard | NAS6703 thru NAS6720 (active, revision 13, 2026) |
| Title | Bolt, Tension, Hex Head, Close Tolerance, A286 CRES, Long Thread, Reduced Major Thread Dia., Self-Locking and Nonlocking, 160 KSI Ftu |
| Material | A286 per AMS 5731, 5732, 5737 or 5853; cadmium plated (default), aluminum coated (A) or passivated (B) |
| Thread | UNJF-3A, .190-32 through 1.250-12 |
| Strength | 160,000 psi minimum tensile |
| Head | Low-profile hex head, flat top on 1-1/8 and 1-1/4; drilled shank (D), drilled head (H) |
| Typical use | Airframe structural joints needing corrosion or heat resistance and full thread engagement |
Part numbers covered: NAS6703 through NAS6720. Reference only; the current revision of the standard on your order governs.
Reading the part number.
| Element | Meaning |
|---|---|
| NAS67xx | Diameter in sixteenths: 03 = #10 … 20 = 1-1/4 |
| Dash number | Grip in 1/16 in. increments |
| A / B / C | Aluminum coated / passivated / chromium plated |
| L | Self-locking element |
| D / H | Drilled shank / drilled head |
How Cyclone makes them
Bar stock certified to the material specification is cut, turned and threaded to the standard’s dimensions, with drilled heads or shanks and head markings as the part number requires. Plating and locking elements are applied through partner facilities to the standard.
Lead time
Quoted on each order. Because the parts are machined from bar rather than scheduled through a heading run, lead time is set by machining capacity and material availability. Ask for the current lead time with your RFQ.
Quality
Cyclone’s published certifications include AS9100D, AS9120B, ISO 9001:2015, API Spec Q1, API 20E and API 20F. See quality and certifications.
Documentation
Material test reports and certificates of conformance ship with the order. Additional inspection reports and documentation are quoted to the purchase order.
Questions before you quote
Which A286 specification will the material certs show?
The bar is certified to one of the AMS specifications the standard allows; the material test report on the order shows which.
Does Cyclone stock these?
No. Every part is made to order from certified bar, which is why there is no minimum quantity and why the quote confirms sizes and lead time.
Can you quote a cancelled or superseded number?
Yes. Many MS sheets were reissued as NASM or SAE AS standards with the part numbers unchanged. Send the number on your drawing and the quote names the current document.