fittings › boss reducers
AN893-4D
Aeronautical Standard Boss Reducer
Description
Bushing, Reducer
Specifications
| Alternate Part Number | AS5172D0412L |
|---|---|
| Connection Style | External seat for gasket seal (boss) 2nd end, Gasket seal (boss) 1st end |
| Connection Type | Threaded external boss 2nd end, Threaded internal boss 1st end |
| Industry Standards/Certification | AN893 |
| Material | Aluminum |
| NIIN | 00-889-2283 |
| NSN | 4730-00-889-2283 |
| Nominallength | 0.969 |
| Overall Dimension G | 1.375 in |
| Overall Dimension M | 31/32 in |
| Special Features | Drilled for lockwire |
| Surface Treatment | Anodize |
| Surface Treatment Specification | Mil-a-8625,type 1 mil spec single treatment response |
| Thread Class | 3a 2nd end, 3b 1st end |
| Thread Qty Per Inch (tpi) | 12 1st end |
| Thread Series Designator | Un 2nd end, Unf 1st end |
| Thread Size | 0.438 inches 1st end, 1.062 inches 2nd end |
| Thread T (Reference) | 1 1/16-12 |
| Weight | 0.1045 lb |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
Cross-reference
No interchangeable or dimensionally similar parts are on record for AN893-4D. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error