Model: HT4027-4-14

Close Tolerance Screw

Special Features:

Head has a 1.40 degrees radius dome

Properties:

Thread Class

Thread Direction

Right-hand

Thread Length

0.469 inches

Fastener Length

Between 1.329 inches and 1.359 inches

Head Style

Fillister countersunk

Head Diameter

Between 0.390 inches and 0.395 inches

Head Height

0.015 inches

Grip Diameter

0.249 mils and 0.250 centimeters

Point Length

0.045 inches

Point Style

Flat

Internal Drive Style

High-torque

Thread Diameter

0.250 inches

Grip Length

0.875 inches

Thready Qty Per Inch (tpi)

Countersink Angle

Between 99.0 degrees and 101.0 degrees

Point Chamfer Angle

45.0 of standard range single treatment response

Part Name Assigned By Controlling Agency

Screw-close tolerance, 100 degrees countersunk, reduced head, hi-torque, non-magnetic cres (125 ksi fsu)

Material

Nickel alloy 718

Material Specification

Ams 5662 assn standard single material response

Surface Treatment

Passivate

Surface Treatment Specification

Ams 2700 assn standard single treatment response

Thread Series Designator

Unjf

NSN

5305-01-591-0381

Part Number

HT4027-4-14

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 HT4027-4-14 NSN 5305-01-591-0381

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:

096640

UFC:

50600

LTL:

70.0

LCL:

WCC:

713

TCC:

SHC:

ACC:

Construction Materials

Pricing & Availability Check

Submit this form for stock availability and pricing.

How to Order

Ordering from buyaircraftparts.com

If you would like to order this close tolerance screw (NSN 5305-01-591-0381) please submit the pricing and availability form above to receive an up to date quote by email. If you agree to the pricing and terms you can e-sign your order online!

We are pleased to have the opportunity to serve you.

Have a Question

Hours:	08:00-18:00 Eastern Standard Time
Phone:	+1 470-231-0824
Email:	Contact Form »

Schedule B and Export

Schedule B: 7508900000
SITC: 69975
End Use: Finished metal shapes
NAICS: 332999
USDA: 1

Freight Class: Other articles of nickel, nesoi (excluding cloth, grill & netting of nickel wire)