Model: 8557

Self-drilling Screw

Special Features:

Drilling point is style tek3

Properties:

Thread Direction

Right-hand

Fastener Length

0.50 inches

Head Style

Hexagon extended washer

Head Height

Between 0.105 inches and 0.120 inches

Width Between Flats

Between 0.305 inches and 0.312 inches

Extended Washer Diameter

Between 0.384 inches and 0.414 inches

Extended Washer Thickness

Between 0.019 inches and 0.031 inches

Pilot Length

0.30 inches

Point Style

Self-drilling

Internal Drive Style

W/o internal drive

End Application

4320-01-533-6417

Thread Diameter

0.19 inches

Thready Qty Per Inch (tpi)

16.0

Min. Tensile Strength (psi)

1936 pounds per square inch

Nonmachine Thread Style

Self drilling

Part Name Assigned By Controlling Agency

Self-drilling fastener

Material

Steel

Surface Treatment

Zinc

NSN

5305-01-605-4408

Part Number

8557

Description

Screw,self-drilling

CAGE

01084

A hardened, externally-threaded fastener with a self-drilling point. It drills, taps and fastens and may have a machine screw thread or a nonmachine screw thread. The threads usually extend from behind the pilot to the bearing surface of the head.

Part 8557 NSN 5305-01-605-4408

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

38031

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:

096640

UFC:

50600

LTL:

70.0

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