MS21083 at a glance
Where to buy
Specification
| Item | Value |
|---|---|
| Type | Self-locking nut |
| Material | Carbon steel (N), corrosion-resistant steel (C) or aluminum (D) |
| Locking | Non-metallic (nylon) insert |
| Max. temperature | 250 °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 | .125 | .141 | .188 | .188 | .219 | .266 | .282 | .328 | .328 | .375 | .407 |
| A min — Height, min | .094 | .110 | .157 | .157 | .188 | .235 | .251 | .298 | .298 | .344 | .376 |
| B max — Across flats, max | .251 | .313 | .345 | .376 | .439 | .502 | .564 | .690 | .752 | .877 | .940 |
| 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 |
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. | Material | Old number (carbon steel) |
|---|---|---|
| MS21083N04 | Carbon steel | MS20364-440A |
| MS21083D04 | Aluminum | — |
| MS21083C04 | Corrosion-resistant steel | — |
.1380-323 part numbers
| Part no. | Material | Old number (carbon steel) |
|---|---|---|
| MS21083N06 | Carbon steel | MS20364-632A |
| MS21083D06 | Aluminum | — |
| MS21083C06 | Corrosion-resistant steel | — |
.1640-323 part numbers
| Part no. | Material | Old number (carbon steel) |
|---|---|---|
| MS21083N08 | Carbon steel | MS20364-832A |
| MS21083D08 | Aluminum | — |
| MS21083C08 | Corrosion-resistant steel | — |
.1900-323 part numbers
| Part no. | Material | Old number (carbon steel) |
|---|---|---|
| MS21083N3 | Carbon steel | MS20364-1032A |
| MS21083D3 | Aluminum | — |
| MS21083C3 | Corrosion-resistant steel | — |
.2500-283 part numbers
| Part no. | Material | Old number (carbon steel) |
|---|---|---|
| MS21083N4 | Carbon steel | MS20364-428A |
| MS21083D4 | Aluminum | — |
| MS21083C4 | Corrosion-resistant steel | — |
.3125-243 part numbers
| Part no. | Material | Old number (carbon steel) |
|---|---|---|
| MS21083N5 | Carbon steel | MS20364-524A |
| MS21083D5 | Aluminum | — |
| MS21083C5 | Corrosion-resistant steel | — |
.3750-243 part numbers
| Part no. | Material | Old number (carbon steel) |
|---|---|---|
| MS21083N6 | Carbon steel | MS20364-624A |
| MS21083D6 | Aluminum | — |
| MS21083C6 | Corrosion-resistant steel | — |
.4375-203 part numbers
| Part no. | Material | Old number (carbon steel) |
|---|---|---|
| MS21083N7 | Carbon steel | MS20364-720A |
| MS21083D7 | Aluminum | — |
| MS21083C7 | Corrosion-resistant steel | — |
.5000-203 part numbers
| Part no. | Material | Old number (carbon steel) |
|---|---|---|
| MS21083N8 | Carbon steel | MS20364-820A |
| MS21083D8 | Aluminum | — |
| MS21083C8 | Corrosion-resistant steel | — |
.5625-181 part number
| Part no. | Material | Old number (carbon steel) |
|---|---|---|
| MS21083N9 | Carbon steel | MS20364-918A |
.6250-181 part number
| Part no. | Material | Old number (carbon steel) |
|---|---|---|
| MS21083N10 | Carbon steel | MS20364-1018A |
Part number
What each code means
| Part | Meaning |
|---|---|
| Example | MS21083N4 — .2500-28 low-height nylon-insert self-locking nut, carbon steel |
Notes from the standard
- Thread to MIL-S-8879. Dash prefix: N carbon steel, C corrosion-resistant steel, D aluminum.
- The old MS20364 numbers are listed against the carbon-steel nuts by size. Aluminum and corrosion-resistant versions are listed for 4-40 to 1/2-20; 9/16-18 and 5/8-18 are carbon steel only.
- 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
- MS21083 — Nut, Self-Locking, Low Height, Nylon Insert, 250 °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.