51A1-25MA

View detailed technical data, stock status, and sourcing information for: 51A1-25MA
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5355 Knobs and Pointers

National Stock Number

5355-00-533-7021

Item Name Code

03263

Assigment Date

09/14/1974 (51 years ago)

A deformable material which prevents the passage of matter through the joint formed when two faces are joined. It may be metallic or nonmetallic, lubricated or impregnated, solid or hollow cross section. It may be made to any predetermined dimension and shape. Excludes:flat disks, items made of felt material and items having joints. For round metal and plastic items with an aperture and a solid rectangular cross section, see washer, flat; shim; bearing, washer, thrust; and spacer ring. Excludes:disk, valve; seal, nonmetallic angle; seal, nonmetallic channel; seal, nonmetallic special shaped section; shielding gasket, electronic; and ring, sealing jar.

0.158 inches maximum distance from hole center to knob/skirt base, 0.078 inches nominal inside diameter, 0.435 inches minimum counterbore diameter, 0.026 inches minimum counterbore depth, 2 setscrew hole quantity

Product Characteristics

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

Inside Diameter: 0.078 inches nominal
Counterbore Diameter: 0.435 inches minimum
Counterbore Depth: 0.026 inches minimum
Setscrew Hole Quantity: 2
Distance From Hole Center To Knob/Skirt Base: 0.158 inches maximum
Overall Depth: 0.405 inches minimum
Gripping Surface Condition: grip aid
Shaft Accommodation Style: counterbored
Outside Diameter: 0.490 inches minimum and 0.530 inches maximum
Attachment Method: setscrews
Overall Thickness: 0.480 inches minimum and 0.540 inches maximum
Screw Drive Type: hexagon socket
Thread Quantity Per Inch: 40 screw hole
Nominal Thread Size: 0.112 inches screw hole
Color: black
Material: plastic
Style Designator: round
Thread Series Designator: unc screw hole

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
22850-001	Knob
27-00075-1	Knob
51A1-25MA	Knob

FAQs

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

What is the FSCG of the NSN 5355-00-533-7021?

The FSCG of the NSN 5355-00-533-7021 is 5355

Does the NSN 5355-00-533-7021 have a Schedule B code assigned?

Yes, the Schedule B code is 8531900002

Does NSN 5355-00-533-7021 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 5355-00-533-7021 contain precious materials?

Precious metal content is unknown

Does NSN 5355-00-533-7021 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 5355-00-533-7021 was assigned to the Federal Catalog?

It was assigned 51 years ago, on Sat, Sep 14, 1974