The Square,thin Steel, cataloged under National Stock Number 5210-01-551-9992, is classified within Federal Supply Class 5210 (Measuring Tools, Craftsmen's) of the Measuring Tools group. The manufacturer of record is L.s. Starrett Company (the) Div Tool Division. Government technical data includes 1 specification, 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. 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 | 5210-01-551-9992 |
| Primary Part Number | 50281 |
| Item Name | Square,thin Steel |
| FSC / FSG | 5210 / 52 — Measuring Tools, Craftsmen's |
| Manufacturer | L.s. Starrett Company (the) Div Tool Division |
| Status | ACTIVE |
| Material | STEEL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 5210-01-551-9992 is a Square,thin Steel, manufactured by L.s. Starrett Company (the) Div Tool Division, classified under FSC 5210, Measuring Tools, Craftsmen's. Status: active.
NSN 5210-01-551-9992 has 2 manufacturer part numbers on file: 55-4 1/2 (L.s. Starrett Company (the) Div Tool Division), 50281 (L.s. Starrett Company (the) Div Tool Division).
1 possible match (shared part number, not a government interchangeability claim): 5315-01-670-4654. Verify interchangeability with system specifications before substitution.
Key specifications for 50281: Special Features: THE BLADE OF THE STARRTT 55 SQUARE IS BEVELED ON BOTH EDGES; BEVEL THICKNESS IS 0.015-0.020 INCH; MATERIAL AISI-01 STEEL; HARDNESS BEAM 57-63 ROCKWELL C, BLADE 53-59 ROCKWELL C; FINISH GRAIN RUBBED STEEL; BLADE TO BASE SQUARENESS 0.0001 INCH; BEAM FLATNESS IS TO SHUT OUT LIGHT; LATERAL SQUARENESS 0.008 INCH MAX; LENGTH OF BLADE 4.5 INCH FROM THE INNER EDGE OF THE BEAM TO THE END OF THE BLADE; LENGTH OF BEAM 3.5 INCH IN; Part Name Assigned by Controlling Agency: MASTER PRECISION SQUARE WITH BEVELED EDGES; Material: STEEL. 1 specification is 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.