The Stud Assembly,turnlock Fastener, cataloged under National Stock Number 5325-01-661-7543, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc Div Camloc Products. Government technical data includes 16 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5325-01-661-7543 |
| Primary Part Number | BACS21ED7AR |
| Item Name | Stud Assembly,turnlock Fastener |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Manufacturer | Howmet Global Fastening Systems Inc Div Camloc Products |
| Status | ACTIVE |
| Surface Treatment Document and Classification | AMS-QQ-P-416,TYPE II,CLASS 2 NATIONAL STD/SPEC SINGLE TREATMENT RESPONSE EYELET |
| Surface Treatment Document and Classification | AMS-QQ-P-416,TYPE II,CLASS 2 NATIONAL STD/SPEC SINGLE TREATMENT RESPONSE STUD |
| Eyelet Outside Diameter | 0.341 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN |
| Drive Type | CROSS RECESS |
| Material Accommodated Thickness | 0.820 INCHES MINIMUM AND 0.860 INCHES MAXIMUM IN |
| Material Document and Classification | UNS R30003 PER AMS 5833 OR 5834 NATIONAL STD/SPEC 1ST MATERIAL RESPONSE OR AMS 5525 OR 5731 NATIONAL STD/SPEC 2ND MATERIAL RESPONSE PIN |
| Diameter | 0.377 INCHES MINIMUM AND 0.384 INCHES MAXIMUM IN |
| Stud Head Height | 0.102 INCHES NOMINAL IN |
| Securing Device Type | WASHER |
| Specification/standard Data | 81205-BACS21ED MANUFACTURERS STANDARD |
| Distance From Engaging Member to Largest Bearing Surface of Head | 0.553 INCHES MINIMUM AND 0.578 INCHES MAXIMUM IN |
| Turnlock Stud Head Style | STUD HEAD |
| Surface Treatment | CADMIUM STUD |
| Surface Treatment | CADMIUM EYELET |
| Stud Assembly Style | STUD ASSEMBLY |
| Eyelet Length | 0.332 INCHES MINIMUM AND 0.362 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 |
|---|---|
| BACS21ED7AR PRIMARY | Howmet Global Fastening Systems Inc Div Camloc Products (USA) |
| BACS21ED7AR PRIMARY | Monadnock Company, the Dba Lisi Aerospace (USA) |
| Reference | Meaning |
|---|---|
| 5325PL1971715 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| BACS21ED7AR | 1/2 Source control — Government-approved source U.S. Government activity |
NSN 5325-01-661-7543 is a Stud Assembly,turnlock Fastener, manufactured by Howmet Global Fastening Systems Inc Div Camloc Products, classified under FSC 5325, Fastening Devices. Status: active.
NSN 5325-01-661-7543 has 2 manufacturer part numbers on file: BACS21ED7AR (Howmet Global Fastening Systems Inc Div Camloc Products), BACS21ED7AR (Monadnock Company, the Dba Lisi Aerospace).
Key specifications for BACS21ED7AR: Surface Treatment Document and Classification: AMS-QQ-P-416,TYPE II,CLASS 2 NATIONAL STD/SPEC SINGLE TREATMENT RESPONSE EYELET; Surface Treatment Document and Classification: AMS-QQ-P-416,TYPE II,CLASS 2 NATIONAL STD/SPEC SINGLE TREATMENT RESPONSE STUD; Eyelet Outside Diameter: 0.341 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN; Drive Type: CROSS RECESS. 16 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.