The Stud,self-Locking, cataloged under National Stock Number 5307-00-340-6668, is classified within Federal Supply Class 5307 (Studs) of the Hardware and Abrasives group. The manufacturer of record is Penn Engineering & Manufacturing Corp. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5307-00-340-6668 |
| Primary Part Number | FHS-256-8 |
| Item Name | Stud,self-Locking |
| FSC / FSG | 5307 / 53 — Studs |
| Manufacturer | Penn Engineering & Manufacturing Corp |
| Status | ACTIVE |
| Thread Length | 0.410 INCHES MINIMUM AND 0.450 INCHES MAXIMUM NUT THREAD IN |
| Style Designator | SELF-LOCKING |
| Thread Direction | RIGHT-HAND NUT THREAD |
| Nominal Thread Size | 0.086 INCHES NUT THREAD IN |
| Head Length | 0.065 INCHES MINIMUM AND 0.075 INCHES MAXIMUM IN |
| Locking Feature | SELF-CLINCHING HEAD |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 2A NUT THREAD A |
| Thread Quantity Per Inch | 56 NUT THREAD |
| Material | STEEL COMP 301 OR STEEL COMP 302 OR STEEL COMP 302B OR STEEL COMP 303 OR STEEL COMP 303SE OR STEEL COMP 304 OR STEEL COMP 304L OR STEEL COMP 305 OR STEEL COMP 308 OR STEEL COMP 309 OR STEEL COMP 309S OR STEEL COMP 310 OR STEEL COMP 310S OR STEEL COMP 314 OR STEEL COMP 316 OR STEEL COMP 316L OR STEEL COMP 317 OR STEEL COMP 321 OR STEEL COMP 347 OR STEEL COMP 348 OR STEEL COMP 384 OR STEEL COMP 385 |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) NUT THREAD |
| Head Diameter | 0.156 INCHES NOMINAL 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 |
|---|---|
| CHS-256-8 | Captive Fasteners Corp (USA) |
| FHS-256-8 PRIMARY | Penn Engineering & Manufacturing Corp (USA) |
| KTS-256-8 | John Crane, Inc (USA) |
| Reference | Meaning |
|---|---|
| 1141381-2 | 5/9 Secondary reference Bae Systems Information and Electronic Systems Integration I |
| 1141381-2 | 5/2 Secondary reference U.S. Government activity |
| 85955700-04 | C/1 Advisory reference — outside the item-of-supply concept General Dynamics Information Systems Inc. Dba General Dynamics Advanced Information Systems |
| 38610-4 | 7/2 Vendor item drawing reference U.S. Government activity |
| 1813141-67 | C/1 Advisory reference — outside the item-of-supply concept Northrop Grumman Systems Corporation |
| 419279-54 | 5/2 Secondary reference U.S. Government activity |
NSN 5307-00-340-6668 is a Stud,self-Locking, manufactured by Penn Engineering & Manufacturing Corp, classified under FSC 5307, Studs. Status: active.
NSN 5307-00-340-6668 has 3 manufacturer part numbers on file: CHS-256-8 (Captive Fasteners Corp), FHS-256-8 (Penn Engineering & Manufacturing Corp), KTS-256-8 (John Crane, Inc).
2 possible matches (shared part number, not a government interchangeability claim): 5905-00-487-1671, 5310-00-827-5224. Verify interchangeability with system specifications before substitution.
Key specifications for FHS-256-8: Thread Length: 0.410 INCHES MINIMUM AND 0.450 INCHES MAXIMUM NUT THREAD IN; Style Designator: SELF-LOCKING; Overall Length: 0.500 INCHES NOMINAL IN; Thread Direction: RIGHT-HAND NUT THREAD. 12 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.