MS21045 at a glance
Where to buy
Specification
| Item | Value |
|---|---|
| Type | Self-locking nut |
| Material | Carbon steel; corrosion-resistant steel (C) |
| Locking | All-metal |
| Max. temperature | 450 °F |
| Status | Check the current issue of the standard before design use. |
Dimensions by size
| Dimension, in | .1120-40 | .1380-32 | .1640-32 | .1900-32 | .2500-28 | .3125-24 | .3750-24 | .4375-20 | .5000-20 | .5625-18 | .6250-18 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| A max — Height, max | .167 | .188 | .250 | .250 | .328 | .360 | .469 | .469 | .610 | .705 | .766 |
| A min — Height, min | .133 | .160 | .219 | .208 | .240 | .271 | .318 | .435 | .575 | .623 | .732 |
| B max — Across flats, max | .243 | .305 | .336 | .367 | .430 | .492 | .553 | .679 | .741 | .865 | .928 |
| B min — Across flats, min | .243 | .305 | .336 | .367 | .430 | .492 | .553 | .679 | .741 | .865 | .928 |
| C — Across corners, min | .268 | .339 | .374 | .410 | .482 | .552 | .622 | .766 | .837 | .978 | 1.051 |
| F — F, min | .044 | .072 | .091 | .085 | .116 | .123 | .153 | .178 | .221 | .243 | .274 |
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.
.1120-403 part numbers
| Part no. | Version | Old AN number |
|---|---|---|
| MS21045-04 | Carbon steel, no dry-film lubricant | AN363-440 |
| MS21045L04 | Carbon steel, dry-film lubricant | — |
| MS21045C04 | Corrosion-resistant steel, dry-film lubricant | — |
.1380-323 part numbers
| Part no. | Version | Old AN number |
|---|---|---|
| MS21045-06 | Carbon steel, no dry-film lubricant | AN363-632 |
| MS21045L06 | Carbon steel, dry-film lubricant | — |
| MS21045C06 | Corrosion-resistant steel, dry-film lubricant | — |
.1640-323 part numbers
| Part no. | Version | Old AN number |
|---|---|---|
| MS21045-08 | Carbon steel, no dry-film lubricant | AN363-832 |
| MS21045L08 | Carbon steel, dry-film lubricant | — |
| MS21045C08 | Corrosion-resistant steel, dry-film lubricant | — |
.1900-323 part numbers
| Part no. | Version | Old AN number |
|---|---|---|
| MS21045-3 | Carbon steel, no dry-film lubricant | AN363-1032 |
| MS21045L3 | Carbon steel, dry-film lubricant | — |
| MS21045C3 | Corrosion-resistant steel, dry-film lubricant | — |
.2500-283 part numbers
| Part no. | Version | Old AN number |
|---|---|---|
| MS21045-4 | Carbon steel, no dry-film lubricant | AN363-428 |
| MS21045L4 | Carbon steel, dry-film lubricant | — |
| MS21045C4 | Corrosion-resistant steel, dry-film lubricant | — |
.3125-243 part numbers
| Part no. | Version | Old AN number |
|---|---|---|
| MS21045-5 | Carbon steel, no dry-film lubricant | AN363-524 |
| MS21045L5 | Carbon steel, dry-film lubricant | — |
| MS21045C5 | Corrosion-resistant steel, dry-film lubricant | — |
.3750-243 part numbers
| Part no. | Version | Old AN number |
|---|---|---|
| MS21045-6 | Carbon steel, no dry-film lubricant | AN363-624 |
| MS21045L6 | Carbon steel, dry-film lubricant | — |
| MS21045C6 | Corrosion-resistant steel, dry-film lubricant | — |
.4375-203 part numbers
| Part no. | Version | Old AN number |
|---|---|---|
| MS21045-7 | Carbon steel, no dry-film lubricant | — |
| MS21045L7 | Carbon steel, dry-film lubricant | — |
| MS21045C7 | Corrosion-resistant steel, dry-film lubricant | — |
.5000-203 part numbers
| Part no. | Version | Old AN number |
|---|---|---|
| MS21045-8 | Carbon steel, no dry-film lubricant | AN363-820 |
| MS21045L8 | Carbon steel, dry-film lubricant | — |
| MS21045C8 | Corrosion-resistant steel, dry-film lubricant | — |
.5625-182 part numbers
| Part no. | Version | Old AN number |
|---|---|---|
| MS21045-9 | Carbon steel, no dry-film lubricant | AN363-918 |
| MS21045L9 | Carbon steel, dry-film lubricant | — |
.6250-182 part numbers
| Part no. | Version | Old AN number |
|---|---|---|
| MS21045-10 | Carbon steel, no dry-film lubricant | AN363-1018 |
| MS21045L10 | Carbon steel, dry-film lubricant | — |
Part number
What each code means
| Part | Meaning |
|---|---|
| Example | MS21045-4 — .2500-28 all-metal self-locking nut, carbon steel, 450 °F |
Notes from the standard
- Thread to MIL-S-8879. L before the dash number: dry-film lubricant; C: corrosion-resistant steel, dry-film lubricant.
- B is printed with the same value for maximum and minimum in the listing.
- AN363-720 (.4375-20) is listed separately, with its own dimensions: A .469 / .453, B .615, C .705, F .178; the listing does not pair it with an MS21045 dash.
- Corrosion-resistant versions are listed for 4-40 to 1/2-20.
- 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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Distributors coming soon.
Sources
- MS21045 — Nut, Self-Locking, Regular Height, All Metal, 450 °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.