Model: AS124-4-20

Close Tolerance Screw

Special Features:

Plunger operated spring loaded retaining balls in threads

Properties:

Thread Class

Thread Direction

Right-hand

Thread Length

Between 0.402 inches and 0.438 inches

Fastener Length

Between 1.668 inches and 1.688 inches

Head Style

Flat countersunk

Head Diameter

Between 0.449 inches and 0.507 inches

Grip Diameter

Between 0.2487 inches and 0.2492 inches

Shank Unthreaded Hole Diameter

0.076 inches first hole and 0.086 inches first hole

Internal Drive Style

High-torque

Thread Diameter

0.250 inches

Grip Length

Between 1.250 inches and 1.266 inches

Thready Qty Per Inch (tpi)

Min. Tensile Strength (psi)

90000 pounds per square inch

Minimum Yield Strength

63000 pounds per square inch

Countersink Angle

100.0 degrees

Distance From Head Largest Bearing Surface To Shank Hole Center

1.583 inches first hole and 1.599 inches first hole

Surface Finish

32.0 microinches bearing surface of head

Surface Finish

32.0 microinches grip

Part Name Assigned By Controlling Agency

Navy special project

Material

Iron alloy 660

Surface Treatment

Passivate

Surface Treatment Specification

Qq-p-35 federal specification single treatment response

Thread Series Designator

Unjf

NSN

5305-01-023-9722

Part Number

AS124-4-20

Description

Screw,close Tolerance

CAGE

84256

A screw, machine or screw, cap, socket head whose unthreaded portion is of specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001 in.) (0.025 mm) or less of a specific diameter for items (1.000 in.) (25 mm) or less in diameter. Items over (1.000 in.) (25 mm) in diameter shall have a tolerance of fifteen ten thousandths (0.0015 in.) (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001 in.) (0.025 mm) below the minimum shank diameter, but not below the minimum major diameter for applicable class of fit, as shown in the screw thread standards, fed std h28 and/or other nationally recognized standards. The head is designed to be held or driven with an inserted driver. It is not designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads.

Part AS124-4-20 NSN 5305-01-023-9722

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

29294

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