The Knob, cataloged under National Stock Number 5355-00-668-1331, is classified within Federal Supply Class 5355 (Knobs and Pointers) of the Hardware and Abrasives group. The manufacturer of record is Eriks Southwest Inc Dba Montclair Enterprises. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 6 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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 | 5355-00-668-1331 |
| Primary Part Number | NAS121R125 |
| Item Name | Knob |
| FSC / FSG | 5355 / 53 — Knobs and Pointers |
| Manufacturer | Eriks Southwest Inc Dba Montclair Enterprises |
| Status | ACTIVE |
| Distance From Hole Center to Knob/skirt Base | 0.500 INCHES NOMINAL IN |
| Inside Width | 0.125 INCHES NOMINAL IN |
| Shaft Accommodation Style | RECTANGULAR |
| Inside Length | 0.625 INCHES MINIMUM AND 0.630 INCHES MAXIMUM IN |
| Style Designator | BALL |
| Outside Diameter | 1.000 INCHES MAXIMUM IN |
| Nominal Thread Size | 0.190 INCHES SCREW HOLE IN |
| Specification/standard Data | 80205-NAS121 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Gripping Surface Condition | SMOOTH |
| Color | RED |
| Screw Drive Type | CROSS RECESS TYPE 1 |
| Thread Quantity Per Inch | 32 SCREW HOLE |
| Material | PLASTIC |
| Thread Series Designator | UNF SCREW HOLE |
| Attachment Method | MACHINE SCREW |
| 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 |
|---|---|
| NAS121R125 | Nor-Cal Supply Co (USA) |
| NAS121R125 PRIMARY | Eriks Southwest Inc Dba Montclair Enterprises (USA) |
| NAS121R125 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| NAS121R125 PRIMARY | Hi-Shear Corporation (USA) |
| NAS121R125 PRIMARY | Apcom Inc (USA) |
| NAS121R125 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| NAS121R-125 | 3/2 Design control — primary reference U.S. Government activity |
| NAS121R125 | 5/9 Secondary reference U.S. Government activity |
| NAS121 | 3/1 Design control — primary reference U.S. Government activity |
| NAS121R125 | 5/9 Secondary reference Air Industries Co Inc |
| NAS121R125 | 5/9 Secondary reference Lawrence Engineering and Supply Inc |
| NAS121R125 | 5/9 Secondary reference Collins Engineering Corp |
NSN 5355-00-668-1331 is a Knob, manufactured by Eriks Southwest Inc Dba Montclair Enterprises, classified under FSC 5355, Knobs and Pointers. Status: active.
NSN 5355-00-668-1331 has 6 manufacturer part numbers on file: NAS121R125 (Nor-Cal Supply Co), NAS121R125 (Eriks Southwest Inc Dba Montclair Enterprises), NAS121R125 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), NAS121R125 (Hi-Shear Corporation), NAS121R125 (Apcom Inc) and 1 more.
5 possible matches (shared part number, not a government interchangeability claim): 5355-00-668-4892, 5355-00-669-4866, 5355-00-669-4867. Verify interchangeability with system specifications before substitution.
Key specifications for NAS121R125: Distance From Hole Center to Knob/skirt Base: 0.500 INCHES NOMINAL IN; Inside Width: 0.125 INCHES NOMINAL IN; Shaft Accommodation Style: RECTANGULAR; Inside Length: 0.625 INCHES MINIMUM AND 0.630 INCHES MAXIMUM IN. 15 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.