Model: 178555-2

Machine Screw

Properties:

Thread Class

Thread Direction

Right-hand

Thread Length

Between 0.087 inches and 0.192 inches

Fastener Length

Between 0.219 inches and 0.250 inches

Head Style

Flat countersunk undercut

Head Diameter

Between 0.292 inches and 0.332 inches

Head Height

Between 0.058 inches and 0.070 inches

Internal Drive Style

Cross recess type 1

End Application

W/s: helicopter, mh-53e; trainer, b-1b aircraft; generator, 60kw, diesel, military standard family; aircraft, c-2a (reprocured); radar set, lightweight 3d (an/tps-59); generator 30kw, diesel, military standard family; aircraft, prowler ea-6b; helicopter, advance attack, ah-1w; teletype, model 28; generator, 15kw, diesel, military standard family

Thread Diameter

0.164 inches

Thready Qty Per Inch (tpi)

Min. Tensile Strength (psi)

60000 pounds per square inch

Countersink Angle

Between 80.0 degrees and 82.0 degrees

Screw Material

Steel

Screw Material Specification

66 federal standard single material response or astma108 assn standard single material response

Screw Surface Treatment

Cadmium and chromate

Screw Surface Treatment Specification

Qq-p-416, type 2 class 3 federal specification single treatment response or mil-c-81562 type 2 class 3 military specification single treatment response

Thread Series Designator

Unc

Nondefinitive Specification/std Data

3 type and 2c style

NSN

5305-00-156-2937

Part Number

178555-2

Description

Screw,machine

CAGE

71791

An externally threaded fastener whose threaded portion is of one nominal diameter, no 0 (0.060 in./1.5 mm) or larger, designed to be held or driven with either a wrench or an inserted driver or both (excluding internal socket or internal multiple spline types), in sizes below no. 10 (0.190 in./5 mm). No. 10 and larger sizes must have a head designed for any type inserted driver (excluding internal socket or internal multiple spline types), but may also be designed for external wrenching. A locking feature may be incorporated in the design of the head or threads. Excludes bolt, clevis; bolt, externally relieved body; screw, externally relieved body; and screw, assembled washer. See also, screw, instrument; bolt, machine; bolt, internal wrenching; and screw, cap socket head.

Part 178555-2 NSN 5305-00-156-2937

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

06657

FIIG:

A500D0

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:

0.2000lbs

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