The Blocking Body,ophthalmic Lens, cataloged under National Stock Number 6540-01-157-4833, is classified within Federal Supply Class 6540 (Ophthalmic Instruments, Equipment, and Supplies) of the Medical, Dental, and Veterinary Equipment group. Government technical data includes 4 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 6540-01-157-4833 |
| Item Name | Blocking Body,ophthalmic Lens |
| FSC / FSG | 6540 / 65 — Ophthalmic Instruments, Equipment, and Supplies |
| Status | ACTIVE |
| Curve Rating in Diopters | 6.00 |
| Lens Surface Contour for Which Designed | CONVEX |
| Material | CARBON |
| Diameter | 43.0 MILLIMETERS MM |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Unit of Issue | EA |
| Reference | Meaning |
|---|---|
| 0167 | 3/9 Design control — primary reference Gerber Coburn Optical Industries Inc |
NSN 6540-01-157-4833 is a Blocking Body,ophthalmic Lens, classified under FSC 6540, Ophthalmic Instruments, Equipment, and Supplies. Status: active.
5 possible matches (shared part number, not a government interchangeability claim): 6520-01-271-8095, 5950-01-375-5027, 4820-01-418-4054. Verify interchangeability with system specifications before substitution.
Key specifications for 6540-01-157-4833: Curve Rating in Diopters: 6.00; Lens Surface Contour for Which Designed: CONVEX; Special Features: CONCAVE ON ONE SIDE,FLAT ON THE OTHER; 0.438 IN. THK; FOR OPHTHALMIC LENS CENTER ORDER 6540-01-154-2163; FOR HOLDING AND SUPPORTING LENS BLANKS DURING GRINDING AND POLISHING IN; Part Name Assigned by Controlling Agency: BLOCKING BODY OPHTHALMIC LENS CARBON STEEL 6.00 DIOPTER CURVE. 4 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.