PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

20557Retainer,valve Head

Real-Time Laboratories, Llc · NSN 1015-01-229-5441 · FSC 1015 · No Item Name Available
Verified by PartsTable
NSN 1015-01-229-5441 — this item is cataloged by the U.S. Government under National Stock Number 1015-01-229-5441. Primary manufacturer part number: 20557.
Features
  • Retainer,valve Head — FSC 1015
  • 1 verified cross-reference
  • Primary manufacturer: Real-Time Laboratories, Llc
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Retainer,valve Head, cataloged under National Stock Number 1015-01-229-5441, is classified within Federal Supply Class 1015 (No Item Name Available) of the Weapons group. The primary manufacturer of record is Real-Time Laboratories, Llc. This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN1015-01-229-5441
Primary Part Number20557
Item NameRetainer,valve Head
FSC / FSG1015 / 10 — No Item Name Available
ManufacturerReal-Time Laboratories, Llc
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 7
4720-00-035-891920557 INTERCHANGEABLE
Hose,preformed
Gates Corporation
6130-00-235-099220557 INTERCHANGEABLE
Vibrator,self-Rectifying
Naval Ship Systems Command
5930-00-302-1125C2001-501 INTERCHANGEABLE
Switch,toggle
Calculagraph Company Dba Control Products, Inc.
4130-01-327-940020557 INTERCHANGEABLE
Filter-Drier,refrigerant
Schneider Metal Mfg Co Inc Ross Temp Div
4810-01-378-883920557 INTERCHANGEABLE
Retainer,disk,valve
Triumph Actuation Systems - Valencia, Inc. Dba Triumph Actuation Systems - Valencia Inc Div Triumph Actuation Systems-Val
5120-01-430-8146 INTERCHANGEABLE
Crowfoot Attachment,socket Wrenc
4720-01-695-002220557 INTERCHANGEABLE
Hose Assembly,nonmetallic
Lockheed Martin Corporation
Cross-Reference Index
Part NumberManufacturer
20557 PRIMARY Real-Time Laboratories, Llc (USA)
Related Parts
4720-00-035-8919INTERCHANGEABLE
HOSE,PREFORMED
20557
6130-00-235-0992INTERCHANGEABLE
VIBRATOR,SELF-RECTIFYING
20557
5930-00-302-1125INTERCHANGEABLE
SWITCH,TOGGLE
C2001-501
4130-01-327-9400INTERCHANGEABLE
FILTER-DRIER,REFRIGERANT
20557
4810-01-378-8839INTERCHANGEABLE
RETAINER,DISK,VALVE
20557
5120-01-430-8146INTERCHANGEABLE
CROWFOOT ATTACHMENT,SOCKET WRENC
4720-01-695-0022INTERCHANGEABLE
HOSE ASSEMBLY,NONMETALLIC
20557

Frequently Asked Questions

What is NSN 1015-01-229-5441?

NSN 1015-01-229-5441 is a Retainer,valve Head, manufactured by Real-Time Laboratories, Llc, classified under FSC 1015 (No Item Name Available). Status: active.

What are the part numbers for NSN 1015-01-229-5441?

NSN 1015-01-229-5441 has 1 cross-referenced part number: 20557 (Real-Time Laboratories, Llc).

What NSN replaces 1015-01-229-5441?

There are 7 known substitutes for 1015-01-229-5441: 4720-00-035-8919, 6130-00-235-0992, 5930-00-302-1125 and 4 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 20557?

Key specifications for 20557: End Item Identification: 2350-01-061-2445,XM1 TANK,2350-01-87-1095,TANK FULL TRACKED,M1A1. 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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