Model: HT8138-4-5T

Close Tolerance Screw

Properties:

Thread Class

Thread Direction

Right-hand

Thread Length

Between 0.400 inches and 0.467 inches

Fastener Length

Between 0.722 inches and 0.769 inches

Head Style

Flat countersunk

Head Diameter

Between 0.475 inches and 0.507 inches

Grip Diameter

Between 0.2485 inches and 0.2495 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 0.302 inches and 0.322 inches

Thready Qty Per Inch (tpi)

Min. Tensile Strength (psi)

160000 pounds per square inch

Hardness Rating

36.0 rockwell c and 40.0 rockwell c

Countersink Angle

Between 99.0 degrees and 101.0 degrees

Distance From Head Largest Bearing Surface To Shank Hole Center

0.534 inches first hole and 0.701 inches first hole

Surface Finish

32.0 microinches bearing surface of head

Surface Finish

32.0 microinches threads

Material

Steel comp 4140 or steel comp e4340 or steel comp 6150 or steel comp 8735 or steel comp 8740

Material Specification

Mil-s-5626 military specification 1st material response or mil-s-5000 military specification 2nd material response or mil-s-8503 military specification 3rd material response or mil-s-6098 military specification 4th material response or mil-s-6049 military specification 5th material response

Surface Treatment

Cadmium and chromate

Surface Treatment Specification

Qq-p-416, type 2 class 3 federal specification all treatment responses

Thread Series Designator

Unf

NSN

5305-00-083-3350

Part Number

HT8138-4-5T

Description

Screw,close Tolerance

CAGE

06950

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 HT8138-4-5T NSN 5305-00-083-3350

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:

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