Model: SC2657-4-6P

Close Tolerance Screw

Special Features:

Grip chamfem at threads 35.0 degrees

Properties:

Thread Class

Thread Direction

Right-hand

Thread Length

0.365 inches

Fastener Length

Between 0.855 inches and 0.885 inches

Head Style

Hexagon

Head Height

Between 0.125 inches and 0.140 inches

Width Between Flats

Between 0.430 inches and 0.439 inches

Grip Diameter

Between 0.2485 inches and 0.2495 inches

Internal Drive Style

Torque-set ribbed

Thread Diameter

0.250 inches

Grip Length

Between 0.365 inches and 0.385 inches

Thready Qty Per Inch (tpi)

Min. Tensile Strength (psi)

160000 pounds per square inch

Surface Finish

32.0 microinches grip32.0 microinches threads

Material

Iron alloy 660

Material Specification

Ams 5731 assn standard single material response or ams5737 assn standard single material response

Surface Treatment

Cadmium and chromate

Surface Treatment Specification

Qq-p-416, ty2 cl2 federal specification single treatment response

Thread Series Designator

Unf

NSN

5305-01-342-4945

Part Number

SC2657-4-6P

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 SC2657-4-6P NSN 5305-01-342-4945

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