PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

M21 SPECIALSensor Assembly,hum

Panametrics Llc · NSN 4440-00-008-4864 · FSC 4440 · No Item Name Available
Verified by PartsTable
NSN 4440-00-008-4864 — this item is cataloged by the U.S. Government under National Stock Number 4440-00-008-4864. Primary manufacturer part number: M21 SPECIAL.
Features
  • Sensor Assembly,hum — FSC 4440
  • General Characteristics Item Description: CONSISTS OF MS28778-10 O-RING 1, G502 SENSOR 1, 4299B ADAPTER 1, MS9021-116 O-RING 1
  • 3 verified cross-references
  • Primary manufacturer: Panametrics Llc
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Sensor Assembly,hum, cataloged under National Stock Number 4440-00-008-4864, is classified within Federal Supply Class 4440 (No Item Name Available) of the Furnace, Steam, Drying, Nuclear Reactors group. The primary manufacturer of record is Panametrics Llc. Government technical data includes 1 verified specification, sourced from the Federal Logistics Information System (FLIS). This item has 3 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
NSN4440-00-008-4864
Primary Part NumberM21 SPECIAL
Item NameSensor Assembly,hum
FSC / FSG4440 / 44 — No Item Name Available
ManufacturerPanametrics Llc
StatusACTIVE
General Characteristics Item DescriptionCONSISTS OF MS28778-10 O-RING 1, G502 SENSOR 1, 4299B ADAPTER 1, MS9021-116 O-RING 1
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
1450-00-137-6221 INTERCHANGEABLE
Pump,hydraulic,air
1377-00-300-7922 INTERCHANGEABLE
Cutter,cartridge Actuated
3460-00-517-8225 INTERCHANGEABLE
Mandrel,roll
5831-00-522-1563 INTERCHANGEABLE
Mounting
5910-00-686-9120M21-E501MN INTERCHANGEABLE
Capacitor,fixed,mica Dielectric
Viking Technologies, Ltd.
4820-00-937-59142125A INTERCHANGEABLE
Valve,check
Industrial Technologies and Services Llc
4720-00-990-167926413 INTERCHANGEABLE
Hose,preformed
Gates Corporation
6740-00-996-6930 INTERCHANGEABLE
Printer,contact
6635-01-009-2106 INTERCHANGEABLE
Magnetometer
6695-01-191-0121 INTERCHANGEABLE
Bezel,instrument Mounting
Cross-Reference Index
Part NumberManufacturer
M21 SPECIAL Panametrics Llc (USA)
3905G502 Howell Laboratories Inc Dba Howell Laboratories Inc (USA)
M21 Panametrics Llc (USA)
Related Parts
1450-00-137-6221INTERCHANGEABLE
PUMP,HYDRAULIC,AIR
1377-00-300-7922INTERCHANGEABLE
CUTTER,CARTRIDGE ACTUATED
3460-00-517-8225INTERCHANGEABLE
MANDREL,ROLL
5831-00-522-1563INTERCHANGEABLE
MOUNTING
5910-00-686-9120INTERCHANGEABLE
CAPACITOR,FIXED,MICA DIELECTRIC
M21-E501MN
4820-00-937-5914INTERCHANGEABLE
VALVE,CHECK
2125A
4720-00-990-1679INTERCHANGEABLE
HOSE,PREFORMED
26413
6740-00-996-6930INTERCHANGEABLE
PRINTER,CONTACT
6635-01-009-2106INTERCHANGEABLE
MAGNETOMETER
6695-01-191-0121INTERCHANGEABLE
BEZEL,INSTRUMENT MOUNTING
3820-01-291-7948INTERCHANGEABLE
AUGER,EARTH,PORTABLE
6520-01-340-9720INTERCHANGEABLE
PIN KIT,THREAD-FORMING,DENTAL

Frequently Asked Questions

What is NSN 4440-00-008-4864?

NSN 4440-00-008-4864 is a Sensor Assembly,hum, manufactured by Panametrics Llc, classified under FSC 4440 (No Item Name Available). Status: active.

What are the part numbers for NSN 4440-00-008-4864?

NSN 4440-00-008-4864 has 3 cross-referenced part numbers: M21 SPECIAL (Panametrics Llc), 3905G502 (Howell Laboratories Inc Dba Howell Laboratories Inc), M21 (Panametrics Llc).

What NSN replaces 4440-00-008-4864?

There are 12 known substitutes for 4440-00-008-4864: 1450-00-137-6221, 1377-00-300-7922, 3460-00-517-8225 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of M21 SPECIAL?

Key specifications for M21 SPECIAL: General Characteristics Item Description: CONSISTS OF MS28778-10 O-RING 1, G502 SENSOR 1, 4299B ADAPTER 1, MS9021-116 O-RING 1. 1 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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