Model: SC1779-4-20

Close Tolerance Screw

Special Features:

Internal drive ribbed

Properties:

Thread Class

Thread Direction

Right-hand

Thread Length

Between 0.386 inches and 0.453 inches

Fastener Length

Between 1.646 inches and 1.693 inches

Head Style

Flat countersunk

Head Diameter

Between 0.464 inches and 0.507 inches

Grip Diameter

Between 0.2485 inches and 0.2495 inches

Internal Drive Style

Offset cruciform (torque set)

Thread Diameter

0.250 inches

Grip Length

Between 1.240 inches and 1.260 inches

Thready Qty Per Inch (tpi)

Min. Tensile Strength (psi)

220000 pounds per square inch

Countersink Angle

Between 99.0 degrees and 101.0 degrees

Surface Finish

32.0 microinches grip

Surface Finish

32.0 microinches threads

Part Name Assigned By Controlling Agency

Navy special project

Material

Steel comp h11

Material Specification

Ams 6487 assn standard single material response

Surface Treatment

Cadmium or cadmium and chromate

Surface Treatment Specification

Mas 672 assn standard 1st treatment response or mil-c-8837, type 2 class 2 military specification 2nd treatment response

Thread Series Designator

Unjf

NSN

5305-01-246-1808

Part Number

SC1779-4-20

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 SC1779-4-20 NSN 5305-01-246-1808

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

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 5305-01-246-1808) 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: 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