PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

74991Insulator,plate

Telemechanics Inc · NSN 5970-00-391-9755 · FSC 5970 · No Item Name Available
Verified by PartsTable
NSN 5970-00-391-9755 — this item is cataloged by the U.S. Government under National Stock Number 5970-00-391-9755. Primary manufacturer part number: 74991.
Features
  • Insulator,plate — FSC 5970
  • Third Hole Spacing: 0.875 INCHES NOMINAL IN
  • First Hole Spacing: 0.312 INCHES NOMINAL IN
  • Second Hole Spacing: 0.375 INCHES NOMINAL IN
  • Identification Code Color: BROWN
  • Material: PLASTIC PHENOLIC AND COTTON OVERALL
  • Second Hole Diameter: 0.125 INCHES NOMINAL IN
  • Style Designator: FLAT, RECTANGULAR
Applications
  • Applications requiring Plastic Phenolic and Cotton Overall construction
General Description

The Insulator,plate, cataloged under National Stock Number 5970-00-391-9755, is classified within Federal Supply Class 5970 (No Item Name Available) of the Electrical and Electronic Equipment Components group. The primary manufacturer of record is Telemechanics Inc. Government technical data includes 9 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 5 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5970-00-391-9755
Primary Part Number74991
Item NameInsulator,plate
FSC / FSG5970 / 59 — No Item Name Available
ManufacturerTelemechanics Inc
StatusACTIVE
Third Hole Spacing0.875 INCHES NOMINAL IN
First Hole Spacing0.312 INCHES NOMINAL IN
Second Hole Spacing0.375 INCHES NOMINAL IN
Identification Code ColorBROWN
MaterialPLASTIC PHENOLIC AND COTTON OVERALL
Second Hole Diameter0.125 INCHES NOMINAL IN
Style DesignatorFLAT, RECTANGULAR
Material Document and ClassificationMIL-P-15035, TYPE FBE MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
First Hole Diameter0.125 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 5
5905-00-158-550515704 INTERCHANGEABLE
Resistor,variable,wire Wound,non
Ohmite Holding, L.l.c. Dba Ohmite Manufacturing
6645-00-483-704474991 INTERCHANGEABLE
Actuator-Timer---Ap
Hamilton Sundstrand Corporation Dba Collins Aerospace
5330-00-641-789674991 INTERCHANGEABLE
Gasket
Honeywell International Inc. Div Aerospace - Torrance
5365-00-701-730574991 INTERCHANGEABLE
Shim
Triumph Engine Control Systems Llc
4820-01-197-985774991B INTERCHANGEABLE
Valve,regulating,fluid Pressure
Griswold Industries Dba Cla-Val Co
Cross-Reference Index
Part NumberManufacturer
74991 American Telephone and Telegraph Co (USA)
74991 PRIMARY Telemechanics Inc (USA)
74991 At and T Corp (USA)
Related Parts
5905-00-158-5505INTERCHANGEABLE
RESISTOR,VARIABLE,WIRE WOUND,NON
15704
6645-00-483-7044INTERCHANGEABLE
ACTUATOR-TIMER---AP
74991
5330-00-641-7896INTERCHANGEABLE
GASKET
74991
5365-00-701-7305INTERCHANGEABLE
SHIM
74991
4820-01-197-9857INTERCHANGEABLE
VALVE,REGULATING,FLUID PRESSURE
74991B

Frequently Asked Questions

What is NSN 5970-00-391-9755?

NSN 5970-00-391-9755 is a Insulator,plate, manufactured by Telemechanics Inc, classified under FSC 5970 (No Item Name Available). Status: active.

What are the part numbers for NSN 5970-00-391-9755?

NSN 5970-00-391-9755 has 3 cross-referenced part numbers: 74991 (American Telephone and Telegraph Co), 74991 (Telemechanics Inc), 74991 (At and T Corp).

What NSN replaces 5970-00-391-9755?

There are 5 known substitutes for 5970-00-391-9755: 5905-00-158-5505, 6645-00-483-7044, 5330-00-641-7896 and 2 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 74991?

Key specifications for 74991: Third Hole Spacing: 0.875 INCHES NOMINAL IN; First Hole Spacing: 0.312 INCHES NOMINAL IN; Second Hole Spacing: 0.375 INCHES NOMINAL IN; Overall Length: 1.500 INCHES NOMINAL IN. 12 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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