MS21245 at a glance
Where to buy
Specification
| Item | Value |
|---|---|
| Type | Self-locking nut |
| Material | Steel (80 ksi) |
| Max. temperature | 450 °F |
| Status | Check the current issue of the standard before design use. |
Dimensions by size
| Dimension, in | .4375-20 | .5000-20 | .5625-18 | .6250-18 | .7500-16 | .8750-14 |
|---|---|---|---|---|---|---|
| A — Height | .328 | .328 | .375 | .407 | .422 | .485 |
| C — Across corners | .765 | .836 | .978 | 1.050 | 1.192 | 1.405 |
| D min — D, min | .448 | .521 | .584 | .646 | .777 | .903 |
| D max — D, max | .478 | .551 | .614 | .676 | .807 | .933 |
| F — F (see drawing) | .458 | .531 | .594 | .656 | .787 | .913 |
| W min — Across flats, min | .679 | .741 | .865 | .928 | 1.052 | 1.239 |
| W max — Across flats, max | .690 | .752 | .877 | .940 | 1.064 | 1.252 |
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.
.6250-182 part numbers
| Part no. | Lubricant |
|---|---|
| MS21245-10 | No dry-film lubricant |
| MS21245L10 | Dry-film lubricant |
.7500-162 part numbers
| Part no. | Lubricant |
|---|---|
| MS21245-11 | No dry-film lubricant |
| MS21245L12 | Dry-film lubricant |
.8750-142 part numbers
| Part no. | Lubricant |
|---|---|
| MS21245-12 | No dry-film lubricant |
| MS21245L14 | Dry-film lubricant |
Part number
What each code means
| Part | Meaning |
|---|---|
| Example | MS21245-8 — .5000-20 thin self-locking nut, no dry-film lubricant |
Notes from the standard
- Chamfer 30° ± 5° and 88° min countersink as on the drawing.
- 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
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Sources
- MS21245 — Nut, Self-Locking, Hexagon, Thin, 450 °F, 80 KSI — 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.