Model: HT4020-4-12A

Close Tolerance Screw

Special Features:

Assembled with one o-ring per st7m251, fscm 76301; cetyl alcohol lubrication

Properties:

Thread Class

Thread Direction

Right-hand

Thread Length

Between 0.443 inches and 0.510 inches

Fastener Length

Between 1.203 inches and 1.250 inches

Head Style

Flat countersunk undercut

Head Diameter

Between 0.502 inches and 0.507 inches

Head Height

Between 0.071 inches and 0.073 inches

Grip Diameter

Between 0.2490 inches and 0.2495 inches

Internal Drive Style

High-torque

Thread Diameter

0.250 inches

Grip Length

Between 0.740 inches and 0.760 inches

Thready Qty Per Inch (tpi)

Countersink Angle

Between 99.0 degrees and 101.0 degrees

Surface Finish

32.0 microinches grip

Surface Finish

32.0 microinches threads

Material

Steel comp xm-13

Material Specification

Ams5629 assn standard single material response

Surface Treatment

Passivate

Surface Treatment Specification

Qq-p-35 federal specification single treatment response

Thread Series Designator

Unjf

NSN

5305-01-231-7415

Part Number

HT4020-4-12A

Description

Screw,close Tolerance

CAGE

17446

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 HT4020-4-12A NSN 5305-01-231-7415

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:

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:

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