The Setscrew, cataloged under National Stock Number 5305-01-173-3531, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Bristol, Inc. Dba Remote Automation Solutions Div Remote Automation Solutions. Government technical data includes 15 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-173-3531 |
| Primary Part Number | MHSS1AC1S |
| Item Name | Setscrew |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Bristol, Inc. Dba Remote Automation Solutions Div Remote Automation Solutions |
| Status | ACTIVE |
| Spline Minor Diameter | 0.025 INCHES MINIMUM AND 0.026 INCHES MAXIMUM IN |
| Fastener Length | 0.062 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Spline Width | 0.011 INCHES MINIMUM AND 0.012 INCHES MAXIMUM IN |
| Spline Major Diameter | 0.034 INCHES MINIMUM AND 0.035 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.086 INCHES IN |
| Head Style | HEADLESS (SETSCREW) |
| Thread Direction | RIGHT-HAND |
| Point Style | CUP |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | FOUR SPLINE |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 56 |
| Material | STEEL COMP 302 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| MHSS1AC1S PRIMARY | Bristol, Inc. Dba Remote Automation Solutions Div Remote Automation Solutions (USA) |
| Reference | Meaning |
|---|---|
| MHSS1A2C1S | 5/9 Secondary reference Bristol Babcock Inc Instruments-Systems Div Sub of Babcock Intl Inc |
| MHSS1A2C1S | 7/2 Vendor item drawing reference Meggitt (new Hampshire), Inc |
| MHSS1A2C1S | 3/9 Design control — primary reference U.S. Government activity |
NSN 5305-01-173-3531 is a Setscrew, manufactured by Bristol, Inc. Dba Remote Automation Solutions Div Remote Automation Solutions, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-173-3531 has 1 manufacturer part number on file: MHSS1AC1S (Bristol, Inc. Dba Remote Automation Solutions Div Remote Automation Solutions).
Key specifications for MHSS1AC1S: Spline Minor Diameter: 0.025 INCHES MINIMUM AND 0.026 INCHES MAXIMUM IN; Fastener Length: 0.062 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Spline Width: 0.011 INCHES MINIMUM AND 0.012 INCHES MAXIMUM IN. 15 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). 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.