NAS6303 through NAS6320 A286 close-tolerance bolts
The A286 close-tolerance airframe bolt with a short thread, 160 ksi, #10-32 through 1-1/4 UNJF-3A, for corrosion and heat resistance.
NAS6303–NAS6320, machined to the standard.
NAS6303 through NAS6320 is the corrosion and heat resistant counterpart of NAS6203: the same close-tolerance hex head bolt with a short thread and reduced major diameter, made from A286 (AMS 5731, 5732, 5737 or 5853) and heat treated to 160 ksi minimum tensile. Cadmium plated by default, with an unplated passivated option.
- 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.
NAS6303–NAS6320 at a glance
| Detail | Specification |
|---|---|
| Standard | NAS6303 thru NAS6320 (current) |
| Title | Bolt, Tension, Hex Head, Close Tolerance, A286 CRES, Short Thread, Reduced Major Dia., Self-Locking and Nonlocking, 160 KSI Ftu |
| Material | A286 per AMS 5731, 5732, 5737 or 5853; cadmium plated (default) or passivated unplated (U) |
| Thread | UNJF-3A, #10-32 through 1-1/4-12 |
| Strength | 160,000 psi minimum tensile |
| Head | Low-profile hex head; drilled shank (D), drilled head (H) |
| Typical use | Airframe structural joints needing corrosion or heat resistance |
Part numbers covered: NAS6303 through NAS6320. Reference only; the current revision of the standard on your order governs.
Reading the part number.
| Element | Meaning |
|---|---|
| NAS63xx | Diameter in sixteenths: 03 = #10 … 20 = 1-1/4 |
| Dash number | Grip in 1/16 in. increments |
| U | Unplated, passivated |
| 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
What is the difference between NAS6303 and NAS6703?
Both are A286 close-tolerance bolts. NAS6303 has the short thread; NAS6703 has the long thread.
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.