The Screw,shoulder, cataloged under National Stock Number 5305-01-181-5031, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Hi-Shear Corporation. Government technical data includes 19 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through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-181-5031 |
| Primary Part Number | HT4020-3-6AY |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Head Height | 0.032 INCHES MINIMUM AND 0.034 INCHES MAXIMUM IN |
| Fastener Length | 0.765 INCHES MINIMUM AND 0.812 INCHES MAXIMUM IN |
| Shoulder Length | 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.218 INCHES NOMINAL FIRST SHOULDER IN |
| Thread Length | 0.380 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.338 INCHES MINIMUM AND 0.381 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 |
|---|---|
| HT4020-3-6AY PRIMARY | Hi-Shear Corporation (USA) |
| HT4020-3-6AY PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| HT4020-3-6AY PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4020-3-6AY PRIMARY | Huck International, Inc (USA) |
| Reference | Meaning |
|---|---|
| HT4020-3-6AY | 5/9 Secondary reference U.S. Government activity |
| HT4020-3-6AY | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| HT4020-3-6AY | 3/2 Design control — primary reference U.S. Government activity |
| CHT4020-3-6AY | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| HT4020-3-6AY | 5/9 Secondary reference U.S. Government activity |
| CHT4020-3-6AY | C/1 Advisory reference — outside the item-of-supply concept Deutsch Co the |
| CHT4020-3-6AY | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 5305-01-181-5031 is a Screw,shoulder, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-181-5031 has 4 manufacturer part numbers on file: HT4020-3-6AY (Hi-Shear Corporation), HT4020-3-6AY (Howmet Global Fastening Systems Inc), HT4020-3-6AY (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT4020-3-6AY (Huck International, Inc).
Key specifications for HT4020-3-6AY: Head Height: 0.032 INCHES MINIMUM AND 0.034 INCHES MAXIMUM IN; Fastener Length: 0.765 INCHES MINIMUM AND 0.812 INCHES MAXIMUM IN; Shoulder Length: 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM FIRST SHOULDER IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 19 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.