The Retainer,packing, cataloged under National Stock Number 5330-01-166-2635, is classified within Federal Supply Class 5330 (Packing and Gasket Materials) of the Hardware and Abrasives group. The manufacturer of record is Steward Machine Co Inc. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5330-01-166-2635 |
| Primary Part Number | 101-263 |
| Item Name | Retainer,packing |
| FSC / FSG | 5330 / 53 — Packing and Gasket Materials |
| Manufacturer | Steward Machine Co Inc |
| Status | ACTIVE |
| Material | COPPER ALLOY OVERALL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 101-263 PRIMARY | Steward Machine Co Inc (USA) |
| 4 3/8-2511-19 PRIMARY | Kingsbury Inc. (USA) |
| Reference | Meaning |
|---|---|
| 3291894 PIECE 263 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 60-213 PIECE 263 | C/1 Advisory reference — outside the item-of-supply concept Hardie-Tynes Co., Inc. |
| 101-263 | 3/9 Design control — primary reference Hardie-Tynes Co., Inc. |
NSN 5330-01-166-2635 is a Retainer,packing, manufactured by Steward Machine Co Inc, classified under FSC 5330, Packing and Gasket Materials. Status: active.
NSN 5330-01-166-2635 has 2 manufacturer part numbers on file: 101-263 (Steward Machine Co Inc), 4 3/8-2511-19 (Kingsbury Inc.).
3 possible matches (shared part number, not a government interchangeability claim): 3110-01-367-4148, 5331-01-473-7033, 5310-01-558-7872. Verify interchangeability with system specifications before substitution.
Key specifications for 101-263: Material: COPPER ALLOY OVERALL. 1 specification is documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.