PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

VT4Gage,vacuum,indicating

Teledyne Instruments, Inc. Dba Teledyne Hastings Instruments Div Teledyne Hastings Instruments · NSN 6685-00-901-3745 · FSC 6685 · No Item Name Available
Verified by PartsTable
NSN 6685-00-901-3745 — this item is cataloged by the U.S. Government under National Stock Number 6685-00-901-3745. Primary manufacturer part number: VT4.
Features
  • Gage,vacuum,indicating — FSC 6685
  • Scale Range: +0.0 TO 20.0 MILLIMETERS OF MERCURY MM
  • Actuation Type: ANY ACCEPTABLE
  • Dial Size: 4 IN. DIA IN
  • Scale Type: SINGLE
  • Mounting Method: PANEL
  • Pointer Type: INDICATING
  • Pointer Color: BLACK
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Gage,vacuum,indicating, cataloged under National Stock Number 6685-00-901-3745, is classified within Federal Supply Class 6685 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Teledyne Instruments, Inc. Dba Teledyne Hastings Instruments Div Teledyne Hastings Instruments. Government technical data includes 10 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN6685-00-901-3745
Primary Part NumberVT4
Item NameGage,vacuum,indicating
FSC / FSG6685 / 66 — No Item Name Available
ManufacturerTeledyne Instruments, Inc. Dba Teledyne Hastings Instruments Div Teledyne Hastings Instruments
StatusCANCELLED
Scale Range+0.0 TO 20.0 MILLIMETERS OF MERCURY MM
Actuation TypeANY ACCEPTABLE
Dial Size4 IN. DIA IN
Scale TypeSINGLE
Mounting MethodPANEL
Pointer TypeINDICATING
Pointer ColorBLACK
AdjustabilityNONADJUSTABLE
Scale NameINCHES OF MERCURY
Scale AccuracyPORM 2 PCT FULL RANGE
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 7
5950-00-087-0431 INTERCHANGEABLE
Transformer,power Autotransforme
5330-00-214-656655149 INTERCHANGEABLE
Gasket
Hamilton Sundstrand Corporation Dba Collins Aerospace
5330-00-297-64321950 INTERCHANGEABLE
Seal,plain Encased
Garlock Sealing Technologies Llc Dba Garlock Sealing Technologies Llc
4820-00-369-323325866ALT12PCN INTERCHANGEABLE
Valve,globe
Portsmouth Naval Shipyard
5120-00-507-355955149 INTERCHANGEABLE
Base and Reservoir
Malabar
6150-01-195-975436890-16-4-30-LP INTERCHANGEABLE
Cable Assembly,power,electrical,
Setra Systems, Inc. Dba Gems Sensors
5360-01-406-004055129 INTERCHANGEABLE
Spring,helical,extension
Deutz Corporation
Cross-Reference Index
Part NumberManufacturer
VT4 PRIMARY Teledyne Instruments, Inc. Dba Teledyne Hastings Instruments Div Teledyne Hastings Instruments (USA)
55-149 Teledyne Instruments, Inc. Dba Teledyne Hastings Instruments Div Teledyne Hastings Instruments (USA)
VT4A Teledyne Instruments, Inc. Dba Teledyne Hastings Instruments Div Teledyne Hastings Instruments (USA)
55-129 Teledyne Instruments, Inc. Dba Teledyne Hastings Instruments Div Teledyne Hastings Instruments (USA)
Related Parts
5950-00-087-0431INTERCHANGEABLE
TRANSFORMER,POWER AUTOTRANSFORME
5330-00-214-6566INTERCHANGEABLE
GASKET
55149
5330-00-297-6432INTERCHANGEABLE
SEAL,PLAIN ENCASED
1950
4820-00-369-3233INTERCHANGEABLE
VALVE,GLOBE
25866ALT12PCN
5120-00-507-3559INTERCHANGEABLE
BASE AND RESERVOIR
55149
6150-01-195-9754INTERCHANGEABLE
CABLE ASSEMBLY,POWER,ELECTRICAL,
36890-16-4-30-LP
5360-01-406-0040INTERCHANGEABLE
SPRING,HELICAL,EXTENSION
55129

Frequently Asked Questions

What is NSN 6685-00-901-3745?

NSN 6685-00-901-3745 is a Gage,vacuum,indicating, manufactured by Teledyne Instruments, Inc. Dba Teledyne Hastings Instruments Div Teledyne Hastings Instruments, classified under FSC 6685 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 6685-00-901-3745?

NSN 6685-00-901-3745 has 4 cross-referenced part numbers: VT4 (Teledyne Instruments, Inc. Dba Teledyne Hastings Instruments Div Teledyne Hastings Instruments), 55-149 (Teledyne Instruments, Inc. Dba Teledyne Hastings Instruments Div Teledyne Hastings Instruments), VT4A (Teledyne Instruments, Inc. Dba Teledyne Hastings Instruments Div Teledyne Hastings Instruments), 55-129 (Teledyne Instruments, Inc. Dba Teledyne Hastings Instruments Div Teledyne Hastings Instruments).

What NSN replaces 6685-00-901-3745?

There are 7 known substitutes for 6685-00-901-3745: 5950-00-087-0431, 5330-00-214-6566, 5330-00-297-6432 and 4 more. Verify interchangeability with system specifications before substitution.

What are the specifications of VT4?

Key specifications for VT4: Scale Range: +0.0 TO 20.0 MILLIMETERS OF MERCURY MM; Actuation Type: ANY ACCEPTABLE; Dial Size: 4 IN. DIA IN; Scale Type: SINGLE. 13 total characteristics are documented in the Federal Logistics Information System.

Is NSN 6685-00-901-3745 still in active supply?

NSN 6685-00-901-3745 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

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