Model: NAS1189-4T20W

Socket Head Cap Screw

Properties:

Thread Class

Thread Direction

Right-hand

Thread Length

0.250 inches

Fastener Length

Between 1.188 inches and 1.250 inches

Head Style

Dee

Head Diameter

0.325 inches

Head Height

0.106 inches

Distance From Centerline To Flat

0.247 inches

Internal Drive Style

Offset cruciform (torque set)

End Application

Helicopter chinook ch-47d

Thread Diameter

0.250 inches

Thready Qty Per Inch (tpi)

Min. Tensile Strength (psi)

5520 pounds per square inch

Part Name Assigned By Controlling Agency

Screw self locking flat

Material

Steel

Thread Series Designator

Unjf

NSN

5305-01-518-5117

Part Number

NAS1189-4T20W

Description

Screw,cap,socket Head

CAGE

80205

An externally threaded fastener whose threaded portion is of one nominal diameter. The head has an internal socket or multiple spline for use with an inserted driver. A locking feature may be incorporated in the design of the head or threads. Excludes items with bevel (conical) heads. See bolt, internal wrenching. Excludes screw, shoulder; and screw, machine.

Part NAS1189-4T20W NSN 5305-01-518-5117

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

16282

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:

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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