NSN 6540-01-246-3801 — this item is cataloged by the U.S. Government under National Stock Number 6540-01-246-3801. Manufacturer of record part number: RT-1.
Also searched as6540-01-246-3801 ·
6540012463801 ·
NIIN 012463801 ·
01-246-3801 ·
FSC 6540 Ophthalmic Instruments, Equipment, and Supplies · CAGE 5S434 · RT-1
General Characteristics Item Description: USED WITH SLIT LIGHT,MDL. SL-6E
1 manufacturer part number on file
Manufacturer of record: Duffens Optical Inc
Identification
NSN: 6540-01-246-3801
NIIN: 012463801
FSC: 6540 — Ophthalmic Instruments, Equipment, and Supplies
FSG: 65 — Medical, Dental, and Veterinary Equipment
Primary part number: RT-1
Manufacturer: Duffens Optical Inc
General Description
The Telescope,diopter, cataloged under National Stock Number 6540-01-246-3801, is classified within Federal Supply Class 6540 (Ophthalmic Instruments, Equipment, and Supplies) of the Medical, Dental, and Veterinary Equipment group. The manufacturer of record is Duffens Optical Inc. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 4 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.
Technical Specifications
Parameter
Value
NSN
6540-01-246-3801
Primary Part Number
RT-1
Item Name
Telescope,diopter
FSC / FSG
6540 / 65 — Ophthalmic Instruments, Equipment, and Supplies
Manufacturer
Duffens Optical Inc
Status
ACTIVE
General Characteristics Item Description
USED WITH SLIT LIGHT,MDL. SL-6E
Lifecycle & Compliance
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
⇄Related Items4
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4930-01-333-0660RT-00001-600POSSIBLE MATCH
RAPID TESTER
Possible match (shared part number)Erdco Engineering Corporation
8040-01-395-8926POSSIBLE MATCH
HARDENER,ADHESIVE
Possible match (shared part number)
6540-01-417-7956RT-1POSSIBLE MATCH
DIOPSIMETER,FIELDS,
Possible match (shared part number)Lombart Brothers, Inc Dba Marco Lombart Div Marco Lombart
5306-01-500-1994RT1POSSIBLE MATCH
BOLT,CAGING
Possible match (shared part number)Haldex Brake Products Corporation
NSN 6540-01-246-3801 is a Telescope,diopter, manufactured by Duffens Optical Inc, classified under FSC 6540, Ophthalmic Instruments, Equipment, and Supplies. Status: active.
What part numbers are listed for NSN 6540-01-246-3801?
NSN 6540-01-246-3801 has 1 manufacturer part number on file: RT-1 (Duffens Optical Inc).
What NSN replaces 6540-01-246-3801?
4 possible matches (shared part number, not a government interchangeability claim): 4930-01-333-0660, 8040-01-395-8926, 6540-01-417-7956. Verify interchangeability with system specifications before substitution.
What are the specifications of RT-1?
Key specifications for RT-1: General Characteristics Item Description: USED WITH SLIT LIGHT,MDL. SL-6E; Part Name Assigned by Controlling Agency: TELESCOPE DIOPTER USED WITH SLIT LIGHT MDL SL-6E; End Item Identification: 6540-01-182-3770. 1 specification is documented in the U.S. Government catalog.
Is NSN 6540-01-246-3801 hazardous material?
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
Sources
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.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.