PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

78017Washer,flat

Fastenal Company Dba Fastenal Co · NSN 5310-01-618-2907 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-01-618-2907 — this item is cataloged by the U.S. Government under National Stock Number 5310-01-618-2907. Primary manufacturer part number: 78017.
Features
  • Washer,flat — FSC 5310
  • Overall Diameter: 0.870 INCHES MINIMUM AND 0.880 INCHES MAXIMUM IN
  • Center Hole Shape Style: ROUND
  • Cross-Sectional Shape Style: RECTANGULAR
  • Hole Diameter: 0.401 INCHES MINIMUM AND 0.411 INCHES MAXIMUM IN
  • Thickness: 0.043 INCHES MINIMUM AND 0.057 INCHES MAXIMUM IN
  • Peripheral Shape Style: ROUND
  • Material: STEEL COMP 316 OVERALL
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Comp 316 Overall construction
General Description

The Washer,flat, cataloged under National Stock Number 5310-01-618-2907, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Fastenal Company Dba Fastenal Co. Government technical data includes 9 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. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5310-01-618-2907
Primary Part Number78017
Item NameWasher,flat
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerFastenal Company Dba Fastenal Co
StatusACTIVE
Overall Diameter0.870 INCHES MINIMUM AND 0.880 INCHES MAXIMUM IN
Center Hole Shape StyleROUND
Cross-Sectional Shape StyleRECTANGULAR
Hole Diameter0.401 INCHES MINIMUM AND 0.411 INCHES MAXIMUM IN
Thickness0.043 INCHES MINIMUM AND 0.057 INCHES MAXIMUM IN
Peripheral Shape StyleROUND
MaterialSTEEL COMP 316 OVERALL
ColorSILVER OVERALL
Surface Treatment Document and ClassificationASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 7
4240-00-851-191426045-1 INTERCHANGEABLE
Tee Assembly
Avox Systems Inc Dba Avox Systems Inc
5962-01-142-5116 INTERCHANGEABLE
Microcircuit,digital
5962-01-204-72647801701ZB INTERCHANGEABLE
Microcircuit,digital
Dla Land and Maritime Dba Engineering and Technical Support Div Document Standardization Division (vendor Item Drawings)
5962-01-216-8923 INTERCHANGEABLE
Microcircuit,digital
5962-01-247-0927 INTERCHANGEABLE
Microcircuit,digital
5930-01-288-4090458-9948 INTERCHANGEABLE
Switch,toggle
Caterpillar Inc Div Caterpillar Defense
5962-01-385-5059 INTERCHANGEABLE
Microcircuit,digital
Cross-Reference Index
Part NumberManufacturer
78017 PRIMARY Fastenal Company Dba Fastenal Co (USA)
001-050367-004 Insitu, Inc. (USA)
Related Parts
4240-00-851-1914INTERCHANGEABLE
TEE ASSEMBLY
26045-1
5962-01-142-5116INTERCHANGEABLE
MICROCIRCUIT,DIGITAL
5962-01-204-7264INTERCHANGEABLE
MICROCIRCUIT,DIGITAL
7801701ZB
5962-01-216-8923INTERCHANGEABLE
MICROCIRCUIT,DIGITAL
5962-01-247-0927INTERCHANGEABLE
MICROCIRCUIT,DIGITAL
5930-01-288-4090INTERCHANGEABLE
SWITCH,TOGGLE
458-9948
5962-01-385-5059INTERCHANGEABLE
MICROCIRCUIT,DIGITAL

Frequently Asked Questions

What is NSN 5310-01-618-2907?

NSN 5310-01-618-2907 is a Washer,flat, manufactured by Fastenal Company Dba Fastenal Co, classified under FSC 5310 (No Item Name Available). Status: active.

What are the part numbers for NSN 5310-01-618-2907?

NSN 5310-01-618-2907 has 2 cross-referenced part numbers: 78017 (Fastenal Company Dba Fastenal Co), 001-050367-004 (Insitu, Inc.).

What NSN replaces 5310-01-618-2907?

There are 7 known substitutes for 5310-01-618-2907: 4240-00-851-1914, 5962-01-142-5116, 5962-01-204-7264 and 4 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 78017?

Key specifications for 78017: Part Name Assigned by Controlling Agency: 3/8 316 STAINLESS STEEL SMALL OD FLAT WASHER; Overall Diameter: 0.870 INCHES MINIMUM AND 0.880 INCHES MAXIMUM IN; Center Hole Shape Style: ROUND; Cross-Sectional Shape Style: RECTANGULAR. 11 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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