PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

RT-236RProtractor,ophthalmic

Lombart Brothers, Inc Dba Marco Lombart Div Marco Lombart · NSN 6540-01-552-8331 · FSC 6540 · No Item Name Available
Verified by PartsTable
NSN 6540-01-552-8331 — this item is cataloged by the U.S. Government under National Stock Number 6540-01-552-8331. Primary manufacturer part number: RT-236R.
Features
  • Protractor,ophthalmic — FSC 6540
  • 3 verified cross-references
  • Primary manufacturer: Lombart Brothers, Inc Dba Marco Lombart Div Marco Lombart
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Protractor,ophthalmic, cataloged under National Stock Number 6540-01-552-8331, is classified within Federal Supply Class 6540 (No Item Name Available) of the Medical, Dental, and Veterinary Equipment group. The primary manufacturer of record is Lombart Brothers, Inc Dba Marco Lombart Div Marco Lombart. This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active. Unit of issue: EA.

Technical Specifications
ParameterValue
NSN6540-01-552-8331
Primary Part NumberRT-236R
Item NameProtractor,ophthalmic
FSC / FSG6540 / 65 — No Item Name Available
ManufacturerLombart Brothers, Inc Dba Marco Lombart Div Marco Lombart
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Unit of IssueEA
Verified Substitutes 10
5340-00-992-39307131 SUCCESSOR
Cup,compression
Garlock Sealing Technologies Llc Dba Garlock Sealing Technologies Llc
2940-00-097-997342853 INTERCHANGEABLE
Filter Element,intake Air Cleane
Wix Corp
5305-00-151-2927 INTERCHANGEABLE
Screw,machine
3455-00-474-577451-10408 INTERCHANGEABLE
Cutter,milling,end
Union Butterfield Corp P O Box 9000 Crystal Lake Il 60039
6210-00-518-4087285-3 INTERCHANGEABLE
Control,electric Light
General Dynamics Ots (aerospace), Inc. Dba General Dynamics Ordinance and Tactical Systems Div Seattle Operations
3010-00-554-8909 INTERCHANGEABLE
Clutch Half,positive,nonvehicula
5330-00-674-39992853 INTERCHANGEABLE
Gasket
Rubbercraft Corporation of California, Ltd. Dba Rubbercraft Corp
5325-00-954-38282853 INTERCHANGEABLE
Grommet,nonmetallic
Atlantic India Rubber Co Inc
6680-01-014-0787 INTERCHANGEABLE
Shaft Assembly,pointer
5999-01-176-1741 INTERCHANGEABLE
Contact,electrical
Cross-Reference Index
Part NumberManufacturer
RT-236R PRIMARY Lombart Brothers, Inc Dba Marco Lombart Div Marco Lombart (USA)
2853 Defense Logistics Agency Directorate of Medical Materiel Defense Supply Center Philadelphia (USA)
6540NCM071206 Defense Medical Standardization Board (USA)
Related Parts
5340-00-992-3930SUCCESSOR
CUP,COMPRESSION
7131
2940-00-097-9973INTERCHANGEABLE
FILTER ELEMENT,INTAKE AIR CLEANE
42853
5305-00-151-2927INTERCHANGEABLE
SCREW,MACHINE
3455-00-474-5774INTERCHANGEABLE
CUTTER,MILLING,END
51-10408
6210-00-518-4087INTERCHANGEABLE
CONTROL,ELECTRIC LIGHT
285-3
3010-00-554-8909INTERCHANGEABLE
CLUTCH HALF,POSITIVE,NONVEHICULA
5330-00-674-3999INTERCHANGEABLE
GASKET
2853
5325-00-954-3828INTERCHANGEABLE
GROMMET,NONMETALLIC
2853
6680-01-014-0787INTERCHANGEABLE
SHAFT ASSEMBLY,POINTER
5999-01-176-1741INTERCHANGEABLE
CONTACT,ELECTRICAL

Frequently Asked Questions

What is NSN 6540-01-552-8331?

NSN 6540-01-552-8331 is a Protractor,ophthalmic, manufactured by Lombart Brothers, Inc Dba Marco Lombart Div Marco Lombart, classified under FSC 6540 (No Item Name Available). Status: active.

What are the part numbers for NSN 6540-01-552-8331?

NSN 6540-01-552-8331 has 3 cross-referenced part numbers: RT-236R (Lombart Brothers, Inc Dba Marco Lombart Div Marco Lombart), 2853 (Defense Logistics Agency Directorate of Medical Materiel Defense Supply Center Philadelphia), 6540NCM071206 (Defense Medical Standardization Board).

What NSN replaces 6540-01-552-8331?

There are 10 known substitutes for 6540-01-552-8331: 5340-00-992-3930, 2940-00-097-9973, 5305-00-151-2927 and 7 more. Verify interchangeability with system specifications before substitution.

What are the specifications of RT-236R?

Key specifications for RT-236R: Part Name Assigned by Controlling Agency: PROTRACTOR AXIS RED RIGHT FOR USE W/6540-00-877-6464; Special Features: RED RIGHT MINUS AXIS PROTRACTOR FOR THE PHOROPTER MINUS CYLINDRICAL LENS TYPE; END ITEM NSN 6540-00-877-6464. 2 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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