PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21506Sear

Charles Reed Knight Jr Dba Knight's Armament Company · NSN 1005-01-705-8245 · FSC 1005 · No Item Name Available
Verified by PartsTable
NSN 1005-01-705-8245 — this item is cataloged by the U.S. Government under National Stock Number 1005-01-705-8245. Primary manufacturer part number: 21506.
Features
  • Sear — FSC 1005
  • 1 verified cross-reference
  • Primary manufacturer: Charles Reed Knight Jr Dba Knight's Armament Company
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Sear, cataloged under National Stock Number 1005-01-705-8245, is classified within Federal Supply Class 1005 (No Item Name Available) of the Weapons group. The primary manufacturer of record is Charles Reed Knight Jr Dba Knight's Armament Company. This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 11 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN1005-01-705-8245
Primary Part Number21506
Item NameSear
FSC / FSG1005 / 10 — No Item Name Available
ManufacturerCharles Reed Knight Jr Dba Knight's Armament Company
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 11
1650-00-168-578421506 INTERCHANGEABLE
Cap,valve
Eaton Aerospace Llc
5120-00-752-903121506 INTERCHANGEABLE
Punch,drive Pin
Mayhew Steel Products Inc
1680-00-760-309421506 INTERCHANGEABLE
Control Assembly,push-Pull
Transdigm Inc
6610-00-919-274021506 INTERCHANGEABLE
Diaphragm Assy
Aerosonic Llc
2990-01-059-9440 INTERCHANGEABLE
Piston
6625-01-070-5910623P INTERCHANGEABLE
Lead Set,test
Halsit Holdings Llc Div Halsit Holdings, Llc Dba Abbatron
5120-01-123-013221-506 INTERCHANGEABLE
Inserter,seal
Bosch Automotive Service Solutions Ltd
4820-01-228-780421506 INTERCHANGEABLE
Retainer,disk,valve
Barksdale, Inc
6685-01-289-0950G21506 INTERCHANGEABLE
Control,temperature,indicating
National Oil Well Dba Iec Baylor
4820-01-338-229321506 INTERCHANGEABLE
Cap,valve
Schneider Electric Systems Usa Inc
Cross-Reference Index
Part NumberManufacturer
21506 PRIMARY Charles Reed Knight Jr Dba Knight's Armament Company (USA)
Related Parts
1650-00-168-5784INTERCHANGEABLE
CAP,VALVE
21506
5120-00-752-9031INTERCHANGEABLE
PUNCH,DRIVE PIN
21506
1680-00-760-3094INTERCHANGEABLE
CONTROL ASSEMBLY,PUSH-PULL
21506
6610-00-919-2740INTERCHANGEABLE
DIAPHRAGM ASSY
21506
2990-01-059-9440INTERCHANGEABLE
PISTON
6625-01-070-5910INTERCHANGEABLE
LEAD SET,TEST
623P
5120-01-123-0132INTERCHANGEABLE
INSERTER,SEAL
21-506
4820-01-228-7804INTERCHANGEABLE
RETAINER,DISK,VALVE
21506
6685-01-289-0950INTERCHANGEABLE
CONTROL,TEMPERATURE,INDICATING
G21506
4820-01-338-2293INTERCHANGEABLE
CAP,VALVE
21506
2930-01-567-1278INTERCHANGEABLE
COOLER,LUBRICATING OIL,ENGINE
87687372

Frequently Asked Questions

What is NSN 1005-01-705-8245?

NSN 1005-01-705-8245 is a Sear, manufactured by Charles Reed Knight Jr Dba Knight's Armament Company, classified under FSC 1005 (No Item Name Available). Status: active.

What are the part numbers for NSN 1005-01-705-8245?

NSN 1005-01-705-8245 has 1 cross-referenced part number: 21506 (Charles Reed Knight Jr Dba Knight's Armament Company).

What NSN replaces 1005-01-705-8245?

There are 11 known substitutes for 1005-01-705-8245: 1650-00-168-5784, 5120-00-752-9031, 1680-00-760-3094 and 8 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 21506?

Key specifications for 21506: Part Name Assigned by Controlling Agency: AUTOMATIC SEAR ASSEMBLY; End Item Identification: SR-16, MOD 2.2. 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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