51B221-28

Close Tolerance Screw

NSN 5305-00-038-1918

DEMIL

Shelf Life

UOM

NIIN

Demil:

Shelf Life:

N/A

UOM:

1 EA

NIIN:

000381918

Detail Specifications

Thread Class:

Thread Direction:

Right-hand

Thread Length:

Between 0.246 inches and 0.323 inches

Fastener Length:

Between 2.011 inches and 2.058 inches

Head Style:

Pan

Head Diameter:

Between 0.361 inches and 0.381 inches

Head Height:

Between 0.103 inches and 0.118 inches

Grip Diameter:

Between 0.1885 inches and 0.1895 inches

Internal Drive Style:

Offset cruciform (torque set)

Thread Diameter:

0.190 inches

Grip Length:

Between 1.735 inches and 1.765 inches

Thready Qty Per Inch (tpi):

Min. Tensile Strength (psi):

180000 pounds per square inch

Hardness Rating:

39.0 rockwell c and 43.0 rockwell c

Surface Finish:

32.0 microinches grip

Material:

Steel comp 4340 or steel comp 4140 or steel comp 8740

Surface Treatment:

Cadmium and chromate

Surface Treatment Specification:

Qq-p-416, type 2 class 2 federal specification all treatment responses

Thread Series Designator:

Unjf

NSN:

5305-00-038-1918

Item Name:

Screw,machine,flat-head,close Tolerance

Cage Code:

27624

Manufacturer Part Numbers

Part Number

Cage

RNCC

RNVC

RNAAC

Status

MSDS

SADC

Part Number:

51B221-28

Cage Code:

76823

RNCC:

RNVC:

RNAAC:

Status:

MSDS:

SADC:

Part Number:

51B221-28

Cage Code:

06725

RNCC:

RNVC:

RNAAC:

Status:

MSDS:

SADC:

Part Number:

51B221-28

Cage Code:

06950

RNCC:

RNVC:

RNAAC:

Status:

MSDS:

SADC:

Part Number:

51B221-28

Cage Code:

73197

RNCC:

RNVC:

RNAAC:

Status:

MSDS:

SADC:

Part Number:

51B221-28

Cage Code:

80539

RNCC:

RNVC:

RNAAC:

Status:

MSDS:

SADC:

Part Number:

51B221-28

Cage Code:

92215

RNCC:

RNVC:

RNAAC:

Status:

MSDS:

SADC:

Part Number:

51B221-28

Cage Code:

L4528

RNCC:

RNVC:

RNAAC:

Status:

MSDS:

SADC:

Part Number:

51B221-28

Cage Code:

97928

RNCC:

RNVC:

RNAAC:

Status:

MSDS:

SADC:

Part Identification

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

29294

FIIG:

A003B0

Concept No.:

App. Key:

Cond. Code:

Status:

Part Materials

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

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Pricing & Availability

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Definition Definition of approved item name (AIN): "Close Tolerance Flat-head Machine Screw"

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.