PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

41100Transilluminator Head

Welch Allyn, Inc. · NSN 6540-01-461-8991 · FSC 6540 · No Item Name Available
Verified by PartsTable
NSN 6540-01-461-8991 — this item is cataloged by the U.S. Government under National Stock Number 6540-01-461-8991. Primary manufacturer part number: 41100.
Features
  • Transilluminator Head — FSC 6540
  • 5 verified cross-references
  • Primary manufacturer: Welch Allyn, Inc.
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Transilluminator Head, cataloged under National Stock Number 6540-01-461-8991, 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 Welch Allyn, Inc.. This item has 5 commercial cross-references from 4 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
NSN6540-01-461-8991
Primary Part Number41100
Item NameTransilluminator Head
FSC / FSG6540 / 65 — No Item Name Available
ManufacturerWelch Allyn, Inc.
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Unit of IssueEA
Verified Substitutes 10
Gear,motor
3110-00-100-358841100 INTERCHANGEABLE
Cone and Rollers,tapered Roller
The Timken Corporation
5950-00-111-472013214E3818-2 INTERCHANGEABLE
Transformer,power
Cecom Lr Center
4820-00-630-169041-100 INTERCHANGEABLE
Valve,regulating,fluid Pressure
Siemens Industry, Inc. Dba Siemens Energy Div Process Industries and Drives
4820-01-127-722474B580072-103 INTERCHANGEABLE
Valve,lift-Check
The Boeing Company Div Defense
5935-01-158-8338720307-1 INTERCHANGEABLE
Connector,receptacle,electrical
Raytheon Company Div Rmd Strategic
5962-01-171-764641100 INTERCHANGEABLE
Microcircuit,memory
Raytheon Company Div Rmd Strategic
5120-01-394-7648 INTERCHANGEABLE
Receptacle,pneumata
5985-01-418-702541100 INTERCHANGEABLE
Attenuator Assembly
U S Dept of Transportation Federal Aviation Administration
6220-01-594-35599811-10 INTERCHANGEABLE
Indicator,light
Moog Inc.
Cross-Reference Index
Part NumberManufacturer
41100 Krasity's Medical & Surgical Supply, Inc. Dba Krasity's (USA)
98-1110 Defense Logistics Agency Directorate of Medical Materiel Defense Supply Center Philadelphia (USA)
WA41100 Krasity's Medical & Surgical Supply, Inc. Dba Krasity's (USA)
41100 Welch Allyn Protocol Inc Dba Welch Allyn Monitoring Div Monitoring Division (USA)
41100 PRIMARY Welch Allyn, Inc. (USA)
Related Parts
6105-01-202-1211SUCCESSOR
GEAR,MOTOR
3110-00-100-3588INTERCHANGEABLE
CONE AND ROLLERS,TAPERED ROLLER
41100
5950-00-111-4720INTERCHANGEABLE
TRANSFORMER,POWER
13214E3818-2
4820-00-630-1690INTERCHANGEABLE
VALVE,REGULATING,FLUID PRESSURE
41-100
4820-01-127-7224INTERCHANGEABLE
VALVE,LIFT-CHECK
74B580072-103
5935-01-158-8338INTERCHANGEABLE
CONNECTOR,RECEPTACLE,ELECTRICAL
720307-1
5962-01-171-7646INTERCHANGEABLE
MICROCIRCUIT,MEMORY
41100
5120-01-394-7648INTERCHANGEABLE
RECEPTACLE,PNEUMATA
5985-01-418-7025INTERCHANGEABLE
ATTENUATOR ASSEMBLY
41100
6220-01-594-3559INTERCHANGEABLE
INDICATOR,LIGHT
9811-10

Frequently Asked Questions

What is NSN 6540-01-461-8991?

NSN 6540-01-461-8991 is a Transilluminator Head, manufactured by Welch Allyn, Inc., classified under FSC 6540 (No Item Name Available). Status: active.

What are the part numbers for NSN 6540-01-461-8991?

NSN 6540-01-461-8991 has 5 cross-referenced part numbers: 41100 (Krasity's Medical & Surgical Supply, Inc. Dba Krasity's), 98-1110 (Defense Logistics Agency Directorate of Medical Materiel Defense Supply Center Philadelphia), WA41100 (Krasity's Medical & Surgical Supply, Inc. Dba Krasity's), 41100 (Welch Allyn Protocol Inc Dba Welch Allyn Monitoring Div Monitoring Division), 41100 (Welch Allyn, Inc.).

What NSN replaces 6540-01-461-8991?

There are 10 known substitutes for 6540-01-461-8991: 6105-01-202-1211, 3110-00-100-3588, 5950-00-111-4720 and 7 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 41100?

Key specifications for 41100: Part Name Assigned by Controlling Agency: TRANSILLUMINATOR HE WELCH ALLYN 3.5 VOLT FINNOFF; Special Features: WELCH ALLYN 3.5V FINNOFF; 6500-74-000-1022, SP25D; UPN H190411001 V. 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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