PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

12-18-1Washer,flat

Porta Drill Inc · NSN 5310-00-400-8510 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-00-400-8510 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-400-8510. Primary manufacturer part number: 12-18-1.
Features
  • Washer,flat — FSC 5310
  • Cross-Sectional Shape Style: RECTANGULAR
  • Thickness: 0.188 INCHES NOMINAL IN
  • Overall Diameter: 0.625 INCHES NOMINAL IN
  • Center Hole Shape Style: ROUND
  • Hole Diameter: 0.395 INCHES MINIMUM AND 0.405 INCHES MAXIMUM IN
  • Peripheral Shape Style: ROUND
  • Material Document and Classification: QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-S-767 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Comp 304 Overall construction
General Description

The Washer,flat, cataloged under National Stock Number 5310-00-400-8510, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Porta Drill Inc. Government technical data includes 8 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. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5310-00-400-8510
Primary Part Number12-18-1
Item NameWasher,flat
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerPorta Drill Inc
StatusACTIVE
Cross-Sectional Shape StyleRECTANGULAR
Thickness0.188 INCHES NOMINAL IN
Overall Diameter0.625 INCHES NOMINAL IN
Center Hole Shape StyleROUND
Hole Diameter0.395 INCHES MINIMUM AND 0.405 INCHES MAXIMUM IN
Peripheral Shape StyleROUND
Material Document and ClassificationQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-S-767 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
MaterialSTEEL COMP 304 OVERALL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 10
5930-00-103-11621218-1 INTERCHANGEABLE
Switch,pressure
Hydra-Electric Company Dba Hydra-Electric Co
5133-00-189-9321 INTERCHANGEABLE
Drill,twist
5365-00-637-212912181 INTERCHANGEABLE
Spacer,sleeve
Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney
5985-01-054-3523121-8-1 INTERCHANGEABLE
Antenna
Allard Nazarian Group, Inc. Dba Granite State Manufacturing
6220-01-246-146122396 INTERCHANGEABLE
Light,warning
Tymco, Inc
3020-01-252-2693S12649 ITEM 6 INTERCHANGEABLE
Gear,spur
B.w. Elliott Manufacturing Co., Llc
2530-01-265-367917-760 INTERCHANGEABLE
Camshaft,actuating,brake Shoe
Bendix Commercial Vehicle Systems Llc Dba Bendix Commercial Vehicle Systems
3110-01-351-4419750821 INTERCHANGEABLE
Plate,retaining,bearing
Hamilton Sundstrand Corporation
3020-01-424-979912181 INTERCHANGEABLE
Gear,internal
Curtiss-Wright Flow Control Corporation Dba Curtiss-Wright Flow Control Co Div Curtiss-Wright / Nu-Torque
5950-01-445-0078TLW-040 IT 10 INTERCHANGEABLE
Coil,electrical
Edgewater Machine & Fabricators
Cross-Reference Index
Part NumberManufacturer
12-18-1 PRIMARY Porta Drill Inc (USA)
75082-1 L3harris Technologies, Inc. Div Space and Airborne Systems (USA)
Related Parts
5930-00-103-1162INTERCHANGEABLE
SWITCH,PRESSURE
1218-1
5133-00-189-9321INTERCHANGEABLE
DRILL,TWIST
5365-00-637-2129INTERCHANGEABLE
SPACER,SLEEVE
12181
5985-01-054-3523INTERCHANGEABLE
ANTENNA
121-8-1
6220-01-246-1461INTERCHANGEABLE
LIGHT,WARNING
22396
3020-01-252-2693INTERCHANGEABLE
GEAR,SPUR
S12649 ITEM 6
2530-01-265-3679INTERCHANGEABLE
CAMSHAFT,ACTUATING,BRAKE SHOE
17-760
3110-01-351-4419INTERCHANGEABLE
PLATE,RETAINING,BEARING
750821
3020-01-424-9799INTERCHANGEABLE
GEAR,INTERNAL
12181
5950-01-445-0078INTERCHANGEABLE
COIL,ELECTRICAL
TLW-040 IT 10

Frequently Asked Questions

What is NSN 5310-00-400-8510?

NSN 5310-00-400-8510 is a Washer,flat, manufactured by Porta Drill Inc, classified under FSC 5310 (No Item Name Available). Status: active.

What are the part numbers for NSN 5310-00-400-8510?

NSN 5310-00-400-8510 has 2 cross-referenced part numbers: 12-18-1 (Porta Drill Inc), 75082-1 (L3harris Technologies, Inc. Div Space and Airborne Systems).

What NSN replaces 5310-00-400-8510?

There are 10 known substitutes for 5310-00-400-8510: 5930-00-103-1162, 5133-00-189-9321, 5365-00-637-2129 and 7 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 12-18-1?

Key specifications for 12-18-1: Cross-Sectional Shape Style: RECTANGULAR; Thickness: 0.188 INCHES NOMINAL IN; Overall Diameter: 0.625 INCHES NOMINAL IN; Center Hole Shape Style: ROUND. 9 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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