PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

K1251Insulation Blanket,thermal

Johns Manville Intl · NSN 5640-01-674-2926 · FSC 5640 · No Item Name Available
Verified by PartsTable
NSN 5640-01-674-2926 — this item is cataloged by the U.S. Government under National Stock Number 5640-01-674-2926. Primary manufacturer part number: K1251.
Features
  • Insulation Blanket,thermal — FSC 5640
  • Thickness: 6.50 INCHES NOMINAL IN
  • Total Recovered Materials Percentage: 30.0
  • Length: 93.00 INCHES NOMINAL IN
  • Environmental Attribute Code: COMPREHENSIVE PROCUREMENT GUIDELINE - CONSTRUCTION PRODUCTS - BUILDING INSULATION PRODUCTS
  • Width: 23.00 INCHES NOMINAL IN
  • 2 verified cross-references
  • Primary manufacturer: Johns Manville Intl
Applications
  • Building construction and repair
  • Infrastructure development
  • Road and bridge materials
General Description

The Insulation Blanket,thermal, cataloged under National Stock Number 5640-01-674-2926, is classified within Federal Supply Class 5640 (No Item Name Available) of the Construction and Building Materials group. The primary manufacturer of record is Johns Manville Intl. Government technical data includes 5 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5640-01-674-2926
Primary Part NumberK1251
Item NameInsulation Blanket,thermal
FSC / FSG5640 / 56 — No Item Name Available
ManufacturerJohns Manville Intl
StatusACTIVE
Thickness6.50 INCHES NOMINAL IN
Total Recovered Materials Percentage30.0
Length93.00 INCHES NOMINAL IN
Environmental Attribute CodeCOMPREHENSIVE PROCUREMENT GUIDELINE - CONSTRUCTION PRODUCTS - BUILDING INSULATION PRODUCTS
Width23.00 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
2530-00-137-1761K125-1 INTERCHANGEABLE
Spindle,wheel,driving-Nondriving
Pdi Ground Support Systems, Inc.
5133-00-266-9462 INTERCHANGEABLE
Drill,twist
5996-00-488-706010584 INTERCHANGEABLE
Amplifier,magnetic
Weigh-Tronix Inc
4810-00-495-863710584 INTERCHANGEABLE
Ring Set,valve Pist
Pacific Piston Ring Co Inc
5133-00-596-0544 INTERCHANGEABLE
Drill,twist
5305-00-787-646810584 INTERCHANGEABLE
Screw,machine
Stanadyne Corporation Dba Stanadyne Diesel Systems Div Diesel Systems
4730-00-813-7558104-20 INTERCHANGEABLE
Adapter,straight,pipe to Hose
Crane Carrier Company, Llc
4820-00-826-2396 INTERCHANGEABLE
Valve,globe
5950-00-954-042810584 INTERCHANGEABLE
Transformer,power Autotransforme
Oeco, Llc Dba Pacific Scientific Oeco Div Fire Safety and Power Systems
6145-01-144-0473 INTERCHANGEABLE
Cable,power,electrical
Cross-Reference Index
Part NumberManufacturer
K1251 PRIMARY Johns Manville Intl (USA)
10584 Lowes of Huntsville (USA)
Related Parts
2530-00-137-1761INTERCHANGEABLE
SPINDLE,WHEEL,DRIVING-NONDRIVING
K125-1
5133-00-266-9462INTERCHANGEABLE
DRILL,TWIST
5996-00-488-7060INTERCHANGEABLE
AMPLIFIER,MAGNETIC
10584
4810-00-495-8637INTERCHANGEABLE
RING SET,VALVE PIST
10584
5133-00-596-0544INTERCHANGEABLE
DRILL,TWIST
5305-00-787-6468INTERCHANGEABLE
SCREW,MACHINE
10584
4730-00-813-7558INTERCHANGEABLE
ADAPTER,STRAIGHT,PIPE TO HOSE
104-20
4820-00-826-2396INTERCHANGEABLE
VALVE,GLOBE
5950-00-954-0428INTERCHANGEABLE
TRANSFORMER,POWER AUTOTRANSFORME
10584
6145-01-144-0473INTERCHANGEABLE
CABLE,POWER,ELECTRICAL
5985-01-146-1277INTERCHANGEABLE
SWITCH,RADIO FREQUENCY TRANSMISS
5930-01-370-6278INTERCHANGEABLE
SWITCH,BOX
453-520-001-603

Frequently Asked Questions

What is NSN 5640-01-674-2926?

NSN 5640-01-674-2926 is a Insulation Blanket,thermal, manufactured by Johns Manville Intl, classified under FSC 5640 (No Item Name Available). Status: active.

What are the part numbers for NSN 5640-01-674-2926?

NSN 5640-01-674-2926 has 2 cross-referenced part numbers: K1251 (Johns Manville Intl), 10584 (Lowes of Huntsville).

What NSN replaces 5640-01-674-2926?

There are 12 known substitutes for 5640-01-674-2926: 2530-00-137-1761, 5133-00-266-9462, 5996-00-488-7060 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of K1251?

Key specifications for K1251: Thickness: 6.50 INCHES NOMINAL IN; Special Features: KRAFT FACED; FIBERGLASS; R19; 133.68 SQ FT; Total Recovered Materials Percentage: 30.0; Length: 93.00 INCHES NOMINAL IN. 6 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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