The Stud,locked in, cataloged under National Stock Number 5307-01-152-0621, is classified within Federal Supply Class 5307 (Studs) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Div Tridair Products. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5307-01-152-0621 |
| Primary Part Number | KLSS10153-3-18 |
| Item Name | Stud,locked in |
| FSC / FSG | 5307 / 53 — Studs |
| Manufacturer | Howmet Global Fastening Systems Inc. Div Tridair Products |
| Status | ACTIVE |
| Material Document and Classification | AMS5737 ASSN STD 1ST MATERIAL RESPONSE AND AMS5504 ASSN STD 2ND MATERIAL RESPONSE |
| Thread Direction | RIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED |
| Nominal Thread Size | 0.250 INCHES STUD THREAD IN |
| Nominal Thread Size | 0.190 INCHES NUT THREAD IN |
| Locking Feature | RING, LOCK KEYED |
| Thread Class | 3A NUT THREAD A |
| Thread Class | 3A STUD THREAD A |
| Thread Quantity Per Inch | 32 NUT THREAD |
| Thread Quantity Per Inch | 20 STUD THREAD |
| Material | STEEL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) NUT THREAD |
| Thread Series Designator | UNJC STUD THREAD |
| 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 |
|---|---|
| KLSS10153-3-18 PRIMARY | Howmet Global Fastening Systems Inc. Div Tridair Products (USA) |
| 877BM-3SB-42 PRIMARY | Stanley Engineered Fastening Llc (USA) |
| Reference | Meaning |
|---|---|
| 10116431 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| 4031T42 | D/9 Drawing number reference only U.S. Government activity |
| 4031T42P18 | 1/2 Source control — Government-approved source U.S. Government activity |
| KLSS10153-3-18 | 5/9 Secondary reference Howmet Global Fastening Systems Inc. Div Microdot Products |
| SL9312-3P18 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5307-01-152-0621 is a Stud,locked in, manufactured by Howmet Global Fastening Systems Inc. Div Tridair Products, classified under FSC 5307, Studs. Status: active.
NSN 5307-01-152-0621 has 2 manufacturer part numbers on file: KLSS10153-3-18 (Howmet Global Fastening Systems Inc. Div Tridair Products), 877BM-3SB-42 (Stanley Engineered Fastening Llc).
1 possible match (shared part number, not a government interchangeability claim): 5307-01-152-0622. Verify interchangeability with system specifications before substitution.
Key specifications for KLSS10153-3-18: Material Document and Classification: AMS5737 ASSN STD 1ST MATERIAL RESPONSE AND AMS5504 ASSN STD 2ND MATERIAL RESPONSE; Overall Length: 0.937 INCHES NOMINAL IN; Thread Direction: RIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED; Nominal Thread Size: 0.250 INCHES STUD THREAD IN. 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.