Model: 391021-A-4

Panel Screw Assembly

Special Features:

Thread to be quadrupled lead

Properties:

Thread Class

Thread Direction

Right-hand

Thread Length

0.250 inches

Fastener Length

0.660 inches

Head Style

Pan

Head Diameter

0.314 inches

Head Height

0.091 inches

Material Accommodated Thickness

Between 0.031 inches and 0.062 inches

Thread Diameter

0.164 inches

Thready Qty Per Inch (tpi)

Material

Aluminum alloy 6061 stand-off

Material

Steel comp 302 fastener or steel comp 304 fastener or steel comp 305 fastener or steel comp 316 fastener or steel comp 321 fastener or steel comp 347 fastener or steel comp 384 fastener or steel comp 385 fastener

Material Specification

Astm-a-493 assn standard single material response fastener

Material Specification

Qq-a-225/8 federal specification single material response stand-off

Surface Treatment

Oxide fastener

Surface Treatment

Plastic epoxy stand-off

Surface Treatment Specification

Mil-c-13924, cl2 military specification single treatment response fastener

Thread Series Designator

Unc

NSN

5305-01-086-9878

Part Number

391021-A-4

Description

Screw Assembly,panel

CAGE

80249

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 391021-A-4 NSN 5305-01-086-9878

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:

0.1000lbs

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:

093490

UFC:

50270

LTL:

50.0

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