Model: B71-04393-136

Tapping Screw

Special Features:

24 to 30 serrations equally spaced clockwise engagement of screw on bearing surface of head

Properties:

Fastener Length

Between 0.469 inches and 0.531 inches

Head Style

Fillister extended washer

Head Diameter

0.365 inches

Head Height

0.170 inches

Extended Washer Diameter

Between 0.425 inches and 0.445 inches

Extended Washer Thickness

0.080 inches

Internal Drive Style

Cross recess type 1

Features Provided

Finished head

Nonmachine Thread Style

Gimlet point (type a, ab or ba)

Nonmachine Thread Diameter

0.190 inches

Material

Steel comp 1021

Surface Treatment

Zinc and chromate

NSN

5305-01-355-2693

Part Number

B71-04393-136

Description

Screw,tapping

CAGE

73439

A hardened externally threaded fastener whose thread extends to the bearing surface of the head. The thread may be fluted or otherwise designed to cut or form its own mating thread. Excludes screw, assembled washer.

Part B71-04393-136 NSN 5305-01-355-2693

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

41756

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:

573

TCC:

SHC:

ACC:

Construction Materials

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Schedule B and Export

Schedule B: 7318140000
SITC: 69421
End Use: Iron and steel products, other
NAICS: 332722
USDA: 1

Freight Class: Self-tapping screws of iron or steel