Model: NAS1146-12

Close Tolerance Screw

Properties:

Thread Class

Thread Direction

Right-hand

Thread Length

Between 0.366 inches and 0.416 inches

Fastener Length

Between 1.126 inches and 1.156 inches

Head Style

Modified pan

Head Diameter

Between 0.671 inches and 0.709 inches

Head Height

Between 0.191 inches and 0.215 inches

Grip Diameter

Between 0.3735 inches and 0.3745 inches

Internal Drive Style

Offset cruciform (torque set)

Thread Diameter

0.375 inches

Grip Length

Between 0.740 inches and 0.760 inches

Thready Qty Per Inch (tpi)

Min. Tensile Strength (psi)

16000 pounds per square inch

Hardness Rating

36.0 rockwell c and 40.0 rockwell c

Hardness Rating

36.0 rockwell c and 40.0 rockwell c

Surface Finish

32.0 microinches grip

Surface Finish

32.0 microinches threads

Part Name Assigned By Controlling Agency

Navy special project

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

Material Specification

Surface Treatment

Cadmium and chromate

Surface Treatment

Cadmium and chromate

Surface Treatment Specification

Qq-p-416, type 2 cl 3 federal specification single treatment response

Thread Series Designator

Unjf

Specification Data

80205-nas1146 professional/industrial association standard

NSN

5305-00-143-9689

Part Number

NAS1146-12

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 NAS1146-12 NSN 5305-00-143-9689

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