PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

4866-B-161Ring,retaining

Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc · NSN 5325-01-577-7388 · FSC 5325 · No Item Name Available
Verified by PartsTable
NSN 5325-01-577-7388 — this item is cataloged by the U.S. Government under National Stock Number 5325-01-577-7388. Primary manufacturer part number: 4866-B-161.
Features
  • Ring,retaining — FSC 5325
  • 3 verified cross-references
  • Primary manufacturer: Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc
Applications
  • General assembly and fastening
  • Structural repair and reinforcement
  • Facility maintenance hardware
General Description

The Ring,retaining, cataloged under National Stock Number 5325-01-577-7388, is classified within Federal Supply Class 5325 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc. This item has 3 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 8 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameRing,retaining
FSC / FSG5325 — No Item Name Available (FSG 53)
ManufacturersMilwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc (CAGE 76364)
Technical Specifications
ParameterValue
NSN5325-01-577-7388
Primary Part Number4866-B-161
Item NameRing,retaining
FSC / FSG5325 / 53 — No Item Name Available
ManufacturerMilwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 8
4820-01-506-51415399-028R-200 INTERCHANGEABLE
Valve,check
Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc
4820-01-506-51505399-028R 1.00IN INTERCHANGEABLE
Valve,check
Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc
4820-01-511-89525399-028R-12 INTERCHANGEABLE
Valve,check
Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc
4820-01-522-92425399-028R 3/4IN INTERCHANGEABLE
Valve,check
Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc
4820-01-577-73825399-028R 14 INTERCHANGEABLE
Valve,check
Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc
4820-01-577-73925399-028R-1/4" NO.7 INTERCHANGEABLE
Disk,valve
Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc
4820-01-582-09125399-028R 3/8IN INTERCHANGEABLE
Valve,check
Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc
4820-01-647-66723873-E-380 INTERCHANGEABLE
Disk,valve
Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc
Cross-Reference Index
Part NumberManufacturer
4866-B-161 PRIMARY Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc (USA)
5399-028R Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc (USA)
5399-028R NO 6 Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc (USA)
Related Parts
4820-01-506-5141INTERCHANGEABLE
VALVE,CHECK
5399-028R-200
4820-01-506-5150INTERCHANGEABLE
VALVE,CHECK
5399-028R 1.00IN
4820-01-511-8952INTERCHANGEABLE
VALVE,CHECK
5399-028R-12
4820-01-522-9242INTERCHANGEABLE
VALVE,CHECK
5399-028R 3/4IN
4820-01-577-7382INTERCHANGEABLE
VALVE,CHECK
5399-028R 14
4820-01-577-7392INTERCHANGEABLE
DISK,VALVE
5399-028R-1/4" NO.7
4820-01-582-0912INTERCHANGEABLE
VALVE,CHECK
5399-028R 3/8IN
4820-01-647-6672INTERCHANGEABLE
DISK,VALVE
3873-E-380

Frequently Asked Questions

What is NSN 5325-01-577-7388?

NSN 5325-01-577-7388 is a Ring,retaining, manufactured by Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc, classified under FSC 5325 (No Item Name Available). Status: active.

What are the part numbers for NSN 5325-01-577-7388?

NSN 5325-01-577-7388 has 3 cross-referenced part numbers: 4866-B-161 (Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc), 5399-028R (Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc), 5399-028R NO 6 (Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc).

What NSN replaces 5325-01-577-7388?

There are 8 known substitutes for 5325-01-577-7388: 4820-01-506-5141, 4820-01-506-5150, 4820-01-511-8952 and 5 more. Verify interchangeability with system specifications before substitution.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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