Model: 121C4MA

Knob

Properties:

Inside Diameter

Between 0.252 inches and 0.254 inches

Counterbore Diameter

0.750 inches

Counterbore Depth

0.250 inches

Setscrew Hole Quantity

Distance From Hole Center To Knob/skirt Base

0.427 inches

Overall Depth

0.605 inches

Gripping Surface Condition

Grip aid

Shaft Accommodation Style

Counterbored

Outside Diameter

Between 1.240 inches and 1.280 inches

Skirt Style

Flared

Reference Marking

Arrow

Attachment Method

Setscrews

Overall Thickness

Between 0.820 inches and 0.880 inches

End Application

Aircraft, c-2a (reprocured), tactical air opns module (an/tyq (23), helicopter, mh-53e, helicopter, advance attack, ah-1w, an/srn-25(v) navigation radio set, radio transmitter set, an/urt-23 (rts), fire control system, mk 92 (fcs) , support equipment, b-52 aircraft, sonar acoustic miscellaneous, surface minesweeping systems

Material Transparency

Opaque

Screw Drive Type

Hexagon socket

Thready Qty Per Inch (tpi)

32 screw hole

Thread Size

0.164 inches screw hole

Skirt Outside Diameter

1.837 inches

Skirt Design

Nondetachable

Style Designator

Round

Thread Series Designator

Unc screw hole

NSN

5355-00-579-1210

Part Number

121C4MA

Description

Knob

CAGE

99813

An item designed to transmit manual, rotary or linear motion to other devices. May include detachable or nondetachable stud (shaft), pointer, or skirt. It may have reference markings in the form of dots, arrows, hairlines, and/or symbols which may be used in conjunction with a calibrated panel, vernier indicator, and the like to indicate the position or motion of items. For items having spokes or simulated spokes radiating from near the center to near the outside rim of the item and relatively thin round disk-shaped items 3 inches (76.2 mm) in diameter or over, see handwheel. For items calibrated in units or series of divisions to denote relative positioning of devices see dial, control. Excludes doorknob; and handle (as modified).

Part 121C4MA NSN 5355-00-579-1210

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

03263

FIIG:

A530M0

Concept No.:

App. Key:

Cond. Code:

Status:

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators

HMIC

PMIC

ESD/EMI

ENAC

MMAC

CRITL

HMIC:

PMIC:

ESD:

MMAC:

CRITL:

Packaging & Shipping

Est. Pack Size

Est. Pack Weight

Est. Item Weight

Est. Item Dim.

Pack Size:

Paclk Weight:

Item Weight:

Item Dim:

OPI

SPI No.

SPI Rev.

SPC Mkg.

LVL A

LVL B

OPI:

SPI No.:

SPI Rev.:

SPC Mkg:

LVL_A:

LVL_B:

Freight Classification

NMFC

UFC

LTL

LCL

WCC

TCC

SHC

ACC

NMFC:

000000

UFC:

00000

LTL:

NO RATING

LCL:

WCC:

772

TCC:

SHC:

ACC:

Construction Materials

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Schedule B and Export

Schedule B: 8531900002
SITC: 77885
End Use: Electric apparatus
NAICS: 335999
USDA: 1

Freight Class: Parts of electric sound or visual signaling apparatus other than printed circuit assemblies, nesoi