The Screw,shoulder, cataloged under National Stock Number 5305-01-141-7901, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-141-7901 |
| Primary Part Number | 3M902C6-18A |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.1017 INCHES MINIMUM AND 0.1037 INCHES MAXIMUM IN |
| Fastener Length | 1.750 INCHES MINIMUM AND 1.797 INCHES MAXIMUM IN |
| Shoulder Length | 1.011 INCHES MINIMUM AND 1.033 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.4052 INCHES MINIMUM AND 0.4057 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.615 INCHES MINIMUM AND 0.682 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.756 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN |
| 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 |
|---|---|
| 11879C6-18A | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT4020-6-18AY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4020-6-18AY | Hi-Shear Corporation (USA) |
| 3M902C6-18A PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| HT4020-6-18AY | 5/2 Secondary reference U.S. Government activity |
| HT4020-6-18AY | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| HT4020-6-18AY | 5/2 Secondary reference U.S. Government activity |
| HT4020-6-18AY | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-141-7901 is a Screw,shoulder, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-141-7901 has 4 manufacturer part numbers on file: 11879C6-18A (Reid Products Inc. Dba Reid Products Inc), HT4020-6-18AY (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT4020-6-18AY (Hi-Shear Corporation), 3M902C6-18A (The Boeing Company Div Defense).
Key specifications for 3M902C6-18A: Head Height: 0.1017 INCHES MINIMUM AND 0.1037 INCHES MAXIMUM IN; Fastener Length: 1.750 INCHES MINIMUM AND 1.797 INCHES MAXIMUM IN; Shoulder Length: 1.011 INCHES MINIMUM AND 1.033 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.4052 INCHES MINIMUM AND 0.4057 INCHES MAXIMUM FIRST SHOULDER IN. 18 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.