Model: 3-53549

Machine Screw

Special Features:

Altered item dwg, head dia. Before altered is 0.502

Properties:

Thread Class

Thread Direction

Right-hand

Thread Length

Between 0.347 inches and 0.393 inches

Fastener Length

Between 0.735 inches and 0.782 inches

Head Style

Flat countersunk

Head Height

Between 0.108 inches and 0.118 inches

Internal Drive Style

Cross recess type ii

End Application

1b-52 acft

Thread Diameter

0.250 inches

Thready Qty Per Inch (tpi)

Countersink Angle

Between 99.5 degrees and 100.5 degrees

Part Name Assigned By Controlling Agency

Screw, special

Screw Material

Steel comp 8630

Screw Surface Treatment

Cadmium

Screw Surface Treatment Specification

An-p-61 federal specification single treatment response

Thread Series Designator

Unf

NSN

5305-01-518-3859

Part Number

3-53549

Description

Screw,machine

CAGE

81205

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 3-53549 NSN 5305-01-518-3859

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:

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:

095190

UFC:

49790

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