The Retainer,helical Compression Spr, cataloged under National Stock Number 5340-00-920-3608, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. Government technical data includes 9 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-00-920-3608 |
| Primary Part Number | 491993 |
| Item Name | Retainer,helical Compression Spr |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| FSC Application Data | CONTROL ASSY,PRESSURE RATIO BLEED,ACFT ENGINE,2995001398687 743548 |
| Material Hardness Rating | 35.0 ROCKWELL C MINIMUM AND 42.0 ROCKWELL C MAXIMUM |
| Body Outside Diameter | 0.749 INCHES MINIMUM AND 0.751 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE |
| Mounting Hole Diameter | 0.183 INCHES MINIMUM AND 0.193 INCHES MAXIMUM IN |
| Body Inside Diameter | 0.629 INCHES MINIMUM AND 0.631 INCHES MAXIMUM IN |
| Lip Thickness | 0.010 INCHES NOMINAL IN |
| Material | STEEL COMP 630 |
| End Hole Diameter | 0.497 INCHES MINIMUM AND 0.503 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Unit of Issue | EA |
| Part Number | Manufacturer |
|---|---|
| 491993 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
NSN 5340-00-920-3608 is a Retainer,helical Compression Spr, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-00-920-3608 has 1 manufacturer part number on file: 491993 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney).
Key specifications for 491993: Overall Height: 1.570 INCHES NOMINAL IN; FSC Application Data: CONTROL ASSY,PRESSURE RATIO BLEED,ACFT ENGINE,2995001398687 743548; Material Hardness Rating: 35.0 ROCKWELL C MINIMUM AND 42.0 ROCKWELL C MAXIMUM; Body Outside Diameter: 0.749 INCHES MINIMUM AND 0.751 INCHES MAXIMUM IN. 9 specifications are 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.