Model: 51-21-209-24

Panel Screw Assembly

Properties:

Thread Class

Thread Direction

Right-hand

Thread Length

0.375 inches

Fastener Length

0.937 inches

Head Style

Knurled no. 4

Head Diameter

0.700 inches

Head Height

0.250 inches

Material Accommodated Thickness

Between 0.094 inches and 0.140 inches

Thread Diameter

0.250 inches

Thready Qty Per Inch (tpi)

Material

Steel comp 303 fastener or steel comp 303se fastener

Material

Steel comp 303 stand-off or steel comp 303se stand-off

Material Specification

Astm a582 assn standard all material responses fastener

Material Specification

Astm a582 assn standard all material responses stand-off

Surface Treatment

Passivate fastener

Surface Treatment

Passivate stand-off

Surface Treatment Specification

Qq-p-35 federal specification single treatment response fastener

Surface Treatment Specification

Qq-p-35 federal specification single treatment response stand-off

Thread Series Designator

Unc

NSN

5305-01-108-1138

Part Number

51-21-209-24

Description

Screw Assembly,panel

CAGE

94222

A headed, threaded fastening device over which may be assembled; (1) a stand-off; (2) a flanged bushing with washer(s) and/or a shouldered bushing without a flange, or it may have an internally threaded sleeve that is an integral part of the screw; a washer and an externally thread self-locking bushing that is driven by an inserted driver. Attached to panel by threaded bushing or by flaring end of stand-off, or bushing. Used in conjunction with a speed nut, nut plate, or driven into a threaded hole in the item that the panel is fastened to. May be spring loaded.

Part 51-21-209-24 NSN 5305-01-108-1138

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

33044

FIIG:

A003B0

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:

093486

UFC:

48950

LTL:

RATING VARIABLE

LCL:

WCC:

713

TCC:

SHC:

ACC:

Construction Materials

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Schedule B and Export

Schedule B: 7318152000
SITC: 69421
End Use: Iron and steel products, other
NAICS: 332722
USDA: 1

Freight Class: Bolts and bolts and their nuts or washers exported in the same shipment