The Stud Assembly,turnlock Fastener, cataloged under National Stock Number 5325-01-355-1580, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. The manufacturer of record is Monadnock Company, the Dba Lisi Aerospace. Government technical data includes 19 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5325-01-355-1580 |
| Primary Part Number | BACS21Z11R |
| Item Name | Stud Assembly,turnlock Fastener |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Manufacturer | Monadnock Company, the Dba Lisi Aerospace |
| Status | ACTIVE |
| Eyelet Outside Diameter | 0.525 INCHES NOMINAL IN |
| Drive Type | CROSS RECESS |
| Material Accommodated Thickness | 0.330 INCHES MINIMUM AND 0.359 INCHES MAXIMUM IN |
| Diameter | 0.300 INCHES NOMINAL IN |
| Stud Head Height | 0.100 INCHES NOMINAL IN |
| Securing Device Type | WASHER |
| Distance From Engaging Member to Largest Bearing Surface of Head | 0.551 INCHES NOMINAL IN |
| Turnlock Stud Head Style | STUD HEAD |
| Surface Treatment | CADMIUM AND CHROMATE EJECTOR SPRING |
| Surface Treatment | CADMIUM AND CHROMATE STUD |
| Surface Treatment | CADMIUM AND CHROMATE PIN |
| Surface Treatment | CADMIUM AND CHROMATE EYELET |
| Material | STEEL COMP 4037 STUD |
| Material | STEEL CORROSION RESISTING WASHER |
| Material | STEEL EYELET |
| Material | STEEL EJECTOR SPRING |
| Material | STEEL PIN |
| Stud Assembly Style | STUD ASSEMBLY |
| Stud Diameter | 0.124 INCHES MINIMUM AND 0.130 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 |
|---|---|
| BACS21Z11R PRIMARY | Monadnock Company, the Dba Lisi Aerospace (USA) |
| 28S14-11 | Howmet Global Fastening Systems Inc Div Camloc Products (USA) |
| BACS21Z11R PRIMARY | Howmet Global Fastening Systems Inc Div Camloc Products (USA) |
| Reference | Meaning |
|---|---|
| BACS21Z11R | 7/2 Vendor item drawing reference U.S. Government activity |
NSN 5325-01-355-1580 is a Stud Assembly,turnlock Fastener, manufactured by Monadnock Company, the Dba Lisi Aerospace, classified under FSC 5325, Fastening Devices. Status: active.
NSN 5325-01-355-1580 has 3 manufacturer part numbers on file: BACS21Z11R (Monadnock Company, the Dba Lisi Aerospace), 28S14-11 (Howmet Global Fastening Systems Inc Div Camloc Products), BACS21Z11R (Howmet Global Fastening Systems Inc Div Camloc Products).
Key specifications for BACS21Z11R: Eyelet Outside Diameter: 0.525 INCHES NOMINAL IN; Drive Type: CROSS RECESS; Material Accommodated Thickness: 0.330 INCHES MINIMUM AND 0.359 INCHES MAXIMUM IN; Diameter: 0.300 INCHES NOMINAL IN. 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.