PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21-19677MKB CPHeader Assembly,hyd

Treadwell Corporation (delaware) Dba Treadwell Corp · NSN 3655-01-031-8621 · FSC 3655 · No Item Name Available
Verified by PartsTable
NSN 3655-01-031-8621 — this item is cataloged by the U.S. Government under National Stock Number 3655-01-031-8621. Primary manufacturer part number: 21-19677MKB CP.
Features
  • Header Assembly,hyd — FSC 3655
  • Reference Number Differentiating Characteristics: CLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D
  • Criticality Code Justification: ZZZY
  • 10 verified cross-references
  • Primary manufacturer: Treadwell Corporation (delaware) Dba Treadwell Corp
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Header Assembly,hyd, cataloged under National Stock Number 3655-01-031-8621, is classified within Federal Supply Class 3655 (No Item Name Available) of the Special Industry Machinery group. The primary manufacturer of record is Treadwell Corporation (delaware) Dba Treadwell Corp. Government technical data includes 2 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 10 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN3655-01-031-8621
Primary Part Number21-19677MKB CP
Item NameHeader Assembly,hyd
FSC / FSG3655 / 36 — No Item Name Available
ManufacturerTreadwell Corporation (delaware) Dba Treadwell Corp
StatusACTIVE
Reference Number Differentiating CharacteristicsCLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D
Criticality Code JustificationZZZY
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Cross-Reference Index
Part NumberManufacturer
21-19677MKB CP Treadwell Corporation (delaware) Dba Treadwell Corp (USA)
21-19677B MK B OXYGEN CLEANCP Naval Inventory Control Point Mechanicsburg (USA)
21-19677MKB Treadwell Corporation (delaware) Dba Treadwell Corp (USA)
21-19677B MK BCP Naval Inventory Control Point Mechanicsburg (USA)
21-19677B MK B OXYGEN CLEAN Treadwell Corporation (delaware) Dba Treadwell Corp (USA)
21-19677MKBCP Naval Inventory Control Point Mechanicsburg (USA)
S9515-A1-MMO-030-FIG&IN-7-34-154 Treadwell Corporation (delaware) Dba Treadwell Corp (USA)
S9515-AA-MMO-030-FIG DES-H-AACP Naval Inventory Control Point Mechanicsburg (USA)
S9515-AA-MMO-030-FIG DES-H-AA Treadwell Corporation (delaware) Dba Treadwell Corp (USA)
21-19677B MK B Treadwell Corporation (delaware) Dba Treadwell Corp (USA)
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Frequently Asked Questions

What is NSN 3655-01-031-8621?

NSN 3655-01-031-8621 is a Header Assembly,hyd, manufactured by Treadwell Corporation (delaware) Dba Treadwell Corp, classified under FSC 3655 (No Item Name Available). Status: active.

What are the part numbers for NSN 3655-01-031-8621?

NSN 3655-01-031-8621 has 10 cross-referenced part numbers: 21-19677MKB CP (Treadwell Corporation (delaware) Dba Treadwell Corp), 21-19677B MK B OXYGEN CLEANCP (Naval Inventory Control Point Mechanicsburg), 21-19677MKB (Treadwell Corporation (delaware) Dba Treadwell Corp), 21-19677B MK BCP (Naval Inventory Control Point Mechanicsburg), 21-19677B MK B OXYGEN CLEAN (Treadwell Corporation (delaware) Dba Treadwell Corp) and 5 more.

What are the specifications of 21-19677MKB CP?

Key specifications for 21-19677MKB CP: Reference Number Differentiating Characteristics: CLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D; Criticality Code Justification: ZZZY. 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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