PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

1904Washer,lock

Itw Shakeproof Automotive Products · NSN 5310-00-187-8609 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-00-187-8609 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-187-8609. Primary manufacturer part number: 1904.
Features
  • Washer,lock — FSC 5310
  • Outside Diameter: 0.255 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN
  • Style Designator: FLAT INTERNAL TEETH
  • Material: COPPER ALLOY OVERALL
  • Hole Diameter: 0.115 INCHES MINIMUM AND 0.123 INCHES MAXIMUM IN
  • Material Thickness: 0.016 INCHES NOMINAL IN
  • Surface Treatment: CADMIUM OVERALL
  • 2 verified cross-references
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Copper Alloy Overall construction
General Description

The Washer,lock, cataloged under National Stock Number 5310-00-187-8609, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Itw Shakeproof Automotive Products. Government technical data includes 6 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5310-00-187-8609
Primary Part Number1904
Item NameWasher,lock
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerItw Shakeproof Automotive Products
StatusCANCELLED
Outside Diameter0.255 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN
Style DesignatorFLAT INTERNAL TEETH
MaterialCOPPER ALLOY OVERALL
Hole Diameter0.115 INCHES MINIMUM AND 0.123 INCHES MAXIMUM IN
Material Thickness0.016 INCHES NOMINAL IN
Surface TreatmentCADMIUM OVERALL
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
5940-00-050-2308 INTERCHANGEABLE
Terminal,lug
5340-00-085-3166CF125 INTERCHANGEABLE
Strap,retaining
Egs Electrical Group Appleton Div
5310-00-187-859573A4 INTERCHANGEABLE
Washer,lock
Philips North America Llc Dba Philips Healthcare
5315-00-252-60031904 INTERCHANGEABLE
Pin,straight,headed
Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic
5930-00-356-8129 INTERCHANGEABLE
Switch,push
4320-00-359-92691904 INTERCHANGEABLE
Impeller,pump,centrifugal
Crane Pumps & Systems Pft Corp Div Crane Pumps & System Pft Corp.
3110-00-406-606768-423508 INTERCHANGEABLE
Bearing,ball,annular
Fag Bearings Corporation
3130-00-441-75881904 INTERCHANGEABLE
Cap,pillow Block
Alamo Aircraft, Ltd.
2520-00-654-82271904 INTERCHANGEABLE
Power Takeoff,transmission
Dana Commercial Vehicle Manufacturing, Llc Dba Dana Commercial Vehicle Products
5120-01-144-5327ANS1904A INTERCHANGEABLE
Socket,socket Wrench
Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc
Cross-Reference Index
Part NumberManufacturer
1904 Itw Shakeproof Automotive Products (USA)
418B Microdot Inc Everlock Chicago Div (USA)
Related Parts
5940-00-050-2308INTERCHANGEABLE
TERMINAL,LUG
5340-00-085-3166INTERCHANGEABLE
STRAP,RETAINING
CF125
5310-00-187-8595INTERCHANGEABLE
WASHER,LOCK
73A4
5315-00-252-6003INTERCHANGEABLE
PIN,STRAIGHT,HEADED
1904
5930-00-356-8129INTERCHANGEABLE
SWITCH,PUSH
4320-00-359-9269INTERCHANGEABLE
IMPELLER,PUMP,CENTRIFUGAL
1904
3110-00-406-6067INTERCHANGEABLE
BEARING,BALL,ANNULAR
68-423508
3130-00-441-7588INTERCHANGEABLE
CAP,PILLOW BLOCK
1904
2520-00-654-8227INTERCHANGEABLE
POWER TAKEOFF,TRANSMISSION
1904
5120-01-144-5327INTERCHANGEABLE
SOCKET,SOCKET WRENCH
ANS1904A
8415-01-170-5076INTERCHANGEABLE
VEST,COOLING
1904
5950-01-186-0193INTERCHANGEABLE
REACTOR
1904

Frequently Asked Questions

What is NSN 5310-00-187-8609?

NSN 5310-00-187-8609 is a Washer,lock, manufactured by Itw Shakeproof Automotive Products, classified under FSC 5310 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5310-00-187-8609?

NSN 5310-00-187-8609 has 2 cross-referenced part numbers: 1904 (Itw Shakeproof Automotive Products), 418B (Microdot Inc Everlock Chicago Div).

What NSN replaces 5310-00-187-8609?

There are 12 known substitutes for 5310-00-187-8609: 5940-00-050-2308, 5340-00-085-3166, 5310-00-187-8595 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 1904?

Key specifications for 1904: Outside Diameter: 0.255 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN; Style Designator: FLAT INTERNAL TEETH; Material: COPPER ALLOY OVERALL; Hole Diameter: 0.115 INCHES MINIMUM AND 0.123 INCHES MAXIMUM IN. 6 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5310-00-187-8609 still in active supply?

NSN 5310-00-187-8609 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

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