PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

505-120Breech Ring,diver's Helmet

Kirby Morgan Dive Systems Inc · NSN 4220-01-701-9285 · FSC 4220 · No Item Name Available
Verified by PartsTable
NSN 4220-01-701-9285 — this item is cataloged by the U.S. Government under National Stock Number 4220-01-701-9285. Primary manufacturer part number: 505-120.
Features
  • Breech Ring,diver's Helmet — FSC 4220
  • 1 verified cross-reference
  • Primary manufacturer: Kirby Morgan Dive Systems Inc
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Breech Ring,diver's Helmet, cataloged under National Stock Number 4220-01-701-9285, is classified within Federal Supply Class 4220 (No Item Name Available) of the Fire Fighting, Rescue, and Safety Equipment group. The primary manufacturer of record is Kirby Morgan Dive Systems Inc. This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4220-01-701-9285
Primary Part Number505-120
Item NameBreech Ring,diver's Helmet
FSC / FSG4220 / 42 — No Item Name Available
ManufacturerKirby Morgan Dive Systems Inc
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 3
5940-00-725-7258505-120 INTERCHANGEABLE
Terminal,lug
Zierick Mfg Corp
5961-00-883-6389 INTERCHANGEABLE
Transistor
5999-01-215-4070300143-4 INTERCHANGEABLE
Mounting Pad,electrical-Electron
Lockheed Martin Sippican, Inc. Div Lockheed Martin Marion
Cross-Reference Index
Part NumberManufacturer
505-120 PRIMARY Kirby Morgan Dive Systems Inc (USA)
Related Parts
5940-00-725-7258INTERCHANGEABLE
TERMINAL,LUG
505-120
5961-00-883-6389INTERCHANGEABLE
TRANSISTOR
5999-01-215-4070INTERCHANGEABLE
MOUNTING PAD,ELECTRICAL-ELECTRON
300143-4

Frequently Asked Questions

What is NSN 4220-01-701-9285?

NSN 4220-01-701-9285 is a Breech Ring,diver's Helmet, manufactured by Kirby Morgan Dive Systems Inc, classified under FSC 4220 (No Item Name Available). Status: active.

What are the part numbers for NSN 4220-01-701-9285?

NSN 4220-01-701-9285 has 1 cross-referenced part number: 505-120 (Kirby Morgan Dive Systems Inc).

What NSN replaces 4220-01-701-9285?

There are 3 known substitutes for 4220-01-701-9285: 5940-00-725-7258, 5961-00-883-6389, 5999-01-215-4070. Verify interchangeability with system specifications before substitution.

What are the specifications of 505-120?

Key specifications for 505-120: Part Name Assigned by Controlling Agency: LARGE, NECK DAM. 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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