4M248-1

View detailed technical data, stock status, and sourcing information for: 4M248-1
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5310 Nuts and Washers

National Stock Number

5310-01-184-3786

Item Name Code

01869

Assigment Date

07/18/1984 (42 years ago)

A washer having a centrally located hole with a solid or laminated cross-section and two flat parallel bearing surfaces. The hole must be 75 percent or less than the largest dimension and the bearing surface finish is greater than 32 microinch (0.8 micrometer). The thickness cannot exceed 25 percent of the largest outside dimension. When the largest outside dimension is less than 1/4 inch or 6mm, the thickness must be 0.006 inches (0.15mm) or greater and for items 1/4 inch (6mm) or larger, the thickness must be 0.016 inches (0.4mm) or greater. The maximum tolerance is applied to dimensions and used as a determining factor. Items with separable lamination use shim. For items fabricated from ceramic or electrically rated materials by specification or industry standards use insulator (1), washer. Excludes:disk, valve, graphite impregnated and lubricated items.

1.200 inches nominal outside diameter, 0.120 inches nominal tapered key minor width, 0.785 inches minimum and 0.800 inches maximum hole diameter, 0.063 inches nominal material thickness, 1.470 inches minimum and 1.570 inches maximum overall distance including keys

Product Characteristics

Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.

Hole Diameter: 0.785 inches minimum and 0.800 inches maximum
Outside Diameter: 1.200 inches nominal
Tapered Key Minor Width: 0.120 inches nominal
Overall Distance Including Keys: 1.470 inches minimum and 1.570 inches maximum
Material Thickness: 0.063 inches nominal
Wire Hole Diameter: 0.070 inches minimum and 0.075 inches maximum
Special Features: distance from wire hole center to end of tapered key 0.060 in.; distance from wire hole center to top of tapered prebent key 0.120 in.; tapered key prebent 30 deg min,40 deg max; hole width across flats 0.655 in. min,0.670 in. max; distance from centerline to flatted bottom of washer 0.485 in. min,0.515 in. max; distance from bottom of washer to inside of prebent key 1.160 in.
Material: aluminum alloy 2024 overall
Material Document And Classification: qq-a-250/4,t4 fed spec single material response overall
Surface Treatment: chromate overall
Surface Treatment Document And Classification: mil-c-5541,ty 2,cl 1a mil spec single treatment response overall

Related Parts

This NSN group includes multiple components designed to meet specific performance and operational standards. Each listing provides detailed specs, functionality data, and replacement compatibility information:

Part Number	Name
4M248-1	Key Washer
M4248-1	Key Washer

FAQs

Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.

What is the FSCG of the NSN 5310-01-184-3786?

The FSCG of the NSN 5310-01-184-3786 is 5310

Does the NSN 5310-01-184-3786 have a Schedule B code assigned?

Yes, the Schedule B code is 7616108000

Does NSN 5310-01-184-3786 require demilitarization?

Items subject to the export administration regulations (ear) in parts 730-774 of title 15, code of federal regulations (cfr) (ccli or ear99) and determined by dod to present a low risk when released out of dod control. No demil, mut, or end use certificate is required. May require an export licensefrom doc.

Does NSN 5310-01-184-3786 contain precious materials?

Item does not contain precious metal.

Does NSN 5310-01-184-3786 contain hazardous materials?

Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.

When the NSN 5310-01-184-3786 was assigned to the Federal Catalog?

It was assigned 42 years ago, on Wed, Jul 18, 1984