D121B4MA

View detailed technical data, stock status, and sourcing information for: D121B4MA
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5355 Knobs and Pointers

National Stock Number

5355-00-851-4953

Item Name Code

03263

Assigment Date

01/01/1962 (64 years ago)

2 setscrew hole quantity, 0.252 inches minimum and 0.254 inches maximum inside diameter, 0.427 inches maximum distance from hole center to knob/skirt base, 0.750 inches minimum counterbore diameter, 0.250 inches minimum counterbore depth

Product Characteristics

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

Inside Diameter: 0.252 inches minimum and 0.254 inches maximum
Counterbore Diameter: 0.750 inches minimum
Counterbore Depth: 0.250 inches minimum
Setscrew Hole Quantity: 2
Distance From Hole Center To Knob/Skirt Base: 0.427 inches maximum
Overall Depth: 0.605 inches minimum
Gripping Surface Condition: grip aid
Shaft Accommodation Style: counterbored
Outside Diameter: 1.240 inches minimum and 1.280 inches maximum
Skirt Style: stepped
Attachment Method: setscrews
Overall Thickness: 1.325 inches minimum and 1.425 inches maximum
Screw Drive Type: hexagon socket
Thread Quantity Per Inch: 32 screw hole
Nominal Thread Size: 0.164 inches screw hole
Skirt Outside Diameter: 1.185 inches maximum
Skirt Design: nondetachable
Special Features: tactile form-gain,1.136 in. min dia,1.176 in. max dia,0.665 in. min thickness,0.715 in. max thickness
Color: black, lusterless
Style Designator: round
Thread Series Designator: unc screw hole

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
5355-00-584-4088	No Name Available	01/01/1960

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
125-2-2G4	Knob
1668366-4	Knob
3D2B4	Knob
512-2-2M-4	Knob
7607833P4	Knob
D121B4MA	Knob
KMS12D2L4	Knob
MS91528-3D2B4	Knob

FAQs

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

What is the FSCG of the NSN 5355-00-851-4953?

The FSCG of the NSN 5355-00-851-4953 is 5355

Does the NSN 5355-00-851-4953 have a Schedule B code assigned?

Yes, the Schedule B code is 8531900002

Does NSN 5355-00-851-4953 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 5355-00-851-4953 contain precious materials?

Precious metal content is unknown

Does NSN 5355-00-851-4953 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 5355-00-851-4953 was assigned to the Federal Catalog?

It was assigned 64 years ago, on Mon, Jan 1, 1962