NAS1805 at a glance
Where to buy
Specification
| Item | Value |
|---|---|
| Type | Self-locking nut |
| Material | A286 corrosion-resistant steel |
| Status | Check the current issue of the standard before design use. |
Dimensions by size
| Dimension, in | .1900-32 | .2500-28 | .3125-24 | .3750-24 | .4375-20 | .5000-20 |
|---|---|---|---|---|---|---|
| A — Washer diameter | .339 | .434 | .532 | .631 | .729 | .828 |
| B — Washer diameter, min | .299 | .394 | .492 | .591 | .689 | .788 |
| C — C, min | .277 | .347 | .418 | .490 | .631 | .703 |
| H — Height, max | .190 | .250 | .312 | .375 | .438 | .500 |
| W max — Across flats, max | .251 | .313 | .376 | .439 | .564 | .627 |
| W min — Across flats, min | .243 | .305 | .367 | .430 | .553 | .616 |
Dimensions in inches, as tabulated for the part. Blank cells (—): not stated in the documents we hold; take them from the standard.
Part numbers
Part numbers as listed for the part; the standard governs and may list others.
.1900-321 part number
| Part no. | Finish |
|---|---|
| NAS1805-3 | Unplated, passivated |
.2500-283 part numbers
| Part no. | Finish |
|---|---|
| NAS1805-4 | Unplated, passivated |
| NAS1805-4L | Dry-film lubricant, cadmium plated |
| NAS1805-4P | Silver plated, no lubricant |
.3125-243 part numbers
| Part no. | Finish |
|---|---|
| NAS1805-5 | Unplated, passivated |
| NAS1805-5L | Dry-film lubricant, cadmium plated |
| NAS1805-5P | Silver plated, no lubricant |
.3750-243 part numbers
| Part no. | Finish |
|---|---|
| NAS1805-6 | Unplated, passivated |
| NAS1805-6L | Dry-film lubricant, cadmium plated |
| NAS1805-6P | Silver plated, no lubricant |
.4375-202 part numbers
| Part no. | Finish |
|---|---|
| NAS1805-7 | Unplated, passivated |
| NAS1805-7L | Dry-film lubricant, cadmium plated |
.5000-201 part number
| Part no. | Finish |
|---|---|
| NAS1805-8 | Unplated, passivated |
Part number
What each code means
| Part | Meaning |
|---|---|
| Example | NAS1805-4L — .2500-28 A286 double-hexagon nut, dry-film lubricant, cadmium plated |
Notes from the standard
- No letter: unplated, passivated. L: dry-film lubricant, cadmium plated. P: silver plated, no lubricant.
- Thread note 1 (not reproduced in the listing) applies to the thread column; check the standard.
- Part number format as commonly written; check the standard for the exact format.
- Approved data governs. Use the nut the SRM, drawing or IPC calls for.
Where to buy
AmericaDistributor coming soonOur partner for this region is on its way
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Distributors coming soon.
Sources
- NAS1805 — Nut, Self-Locking, Extended Washer, Double Hexagon, A286 CRES, 180 KSI, 450 °F and 800 °F — nominal sizes and part numbers.
Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.