NSN 5310-00-166-1436 · NIIN 001661436 · Part number 4220
Colt Industries Operating Corp Pratt and Whitney Machine Tool Div · FSC 5310 — Nuts and Washers · FSG 53 — Hardware and Abrasives · CAGE 48521
Government record, cited
NSN 5310-00-166-1436 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-166-1436. Manufacturer of record part number: 4220.
Also searched as5310-00-166-1436 ·
5310001661436 ·
NIIN 001661436 ·
00-166-1436 ·
FSC 5310 Nuts and Washers · CAGE 48521 · 4220
Hardness Rating: 90.0 ROCKWELL B MINIMUM AND 102.0 ROCKWELL B MAXIMUM
Cross-Sectional Shape Style: RECTANGULAR
Surface Treatment: CADMIUM OVERALL
Peripheral Shape Style: ROUND
Material: STEEL OVERALL
Center Hole Shape Style: ROUND
Identification
NSN: 5310-00-166-1436
NIIN: 001661436
FSC: 5310 — Nuts and Washers
FSG: 53 — Hardware and Abrasives
Primary part number: 4220
Manufacturer: Colt Industries Operating Corp Pratt and Whitney Machine Tool Div
General Description
The Washer,flat, cataloged under National Stock Number 5310-00-166-1436, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Colt Industries Operating Corp Pratt and Whitney Machine Tool Div. Government technical data includes 9 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
5310-00-166-1436
Primary Part Number
4220
Item Name
Washer,flat
FSC / FSG
5310 / 53 — Nuts and Washers
Manufacturer
Colt Industries Operating Corp Pratt and Whitney Machine Tool Div
Status
ACTIVE
Overall Diameter
0.375 INCHES NOMINAL IN
Hardness Rating
90.0 ROCKWELL B MINIMUM AND 102.0 ROCKWELL B MAXIMUM
Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA)
No interchangeability data on file.
Other items in FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040
5310-00-000-0040 · Item name not on file
5310-00-000-0077
NUT,PLAIN,ROUND
5310-00-000-0079
WASHER,FLAT
5310-00-000-0079
WASHER,FLAT
5310-00-000-1146
5310-00-000-1146 · Item name not on file
5310-00-000-3815
5310-00-000-3815 · Item name not on file
5310-00-000-4532
5310-00-000-4532 · Item name not on file
5310-00-000-4540
5310-00-000-4540 · Item name not on file
Frequently Asked Questions
What is NSN 5310-00-166-1436?
NSN 5310-00-166-1436 is a Washer,flat, manufactured by Colt Industries Operating Corp Pratt and Whitney Machine Tool Div, classified under FSC 5310, Nuts and Washers. Status: active.
What part numbers are listed for NSN 5310-00-166-1436?
NSN 5310-00-166-1436 has 2 manufacturer part numbers on file: 4220 (Colt Industries Operating Corp Pratt and Whitney Machine Tool Div), 4220 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney).
What are the specifications of 4220?
Key specifications for 4220: Overall Diameter: 0.375 INCHES NOMINAL IN; Hardness Rating: 90.0 ROCKWELL B MINIMUM AND 102.0 ROCKWELL B MAXIMUM; Cross-Sectional Shape Style: RECTANGULAR; Surface Treatment: CADMIUM OVERALL. 9 specifications are documented in the U.S. Government catalog.
Is NSN 5310-00-166-1436 hazardous material?
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
Sources
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.