PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

4577FPC28Washer,key

Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa · NSN 5310-01-003-8588 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-01-003-8588 — this item is cataloged by the U.S. Government under National Stock Number 5310-01-003-8588. Primary manufacturer part number: 4577FPC28.
Features
  • Washer,key — FSC 5310
  • Criticality Code Justification: ZZZY
  • Reference Number Differentiating Characteristics: MATERIAL WILL BE IN ACCORDANCE WITH NAVICP MECH; ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS.
  • 2 verified cross-references
  • Primary manufacturer: Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
General Description

The Washer,key, cataloged under National Stock Number 5310-01-003-8588, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa. Government technical data includes 2 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5310-01-003-8588
Primary Part Number4577FPC28
Item NameWasher,key
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerAtwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa
StatusACTIVE
Criticality Code JustificationZZZY
Reference Number Differentiating CharacteristicsMATERIAL WILL BE IN ACCORDANCE WITH NAVICP MECH; ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS.
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 1
5310-00-083-93054578-F,PC 28 INTERCHANGEABLE
Washer,key
Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa
Cross-Reference Index
Part NumberManufacturer
4577FPC28 Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa (USA)
4588FPC28 Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa (USA)
Related Parts
5310-00-083-9305INTERCHANGEABLE
WASHER,KEY
4578-F,PC 28

Frequently Asked Questions

What is NSN 5310-01-003-8588?

NSN 5310-01-003-8588 is a Washer,key, manufactured by Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa, classified under FSC 5310 (No Item Name Available). Status: active.

What are the part numbers for NSN 5310-01-003-8588?

NSN 5310-01-003-8588 has 2 cross-referenced part numbers: 4577FPC28 (Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa), 4588FPC28 (Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa).

What NSN replaces 5310-01-003-8588?

There is 1 known substitute for 5310-01-003-8588: 5310-00-083-9305. Verify interchangeability with system specifications before substitution.

What are the specifications of 4577FPC28?

Key specifications for 4577FPC28: Criticality Code Justification: ZZZY; Reference Number Differentiating Characteristics: MATERIAL WILL BE IN ACCORDANCE WITH NAVICP MECH; ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS.. 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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