Model: ST3M521A3-4

Plate Self-locking Nut

Properties:

Thread Class

Thread Direction

Right-hand

Locking Feature

Prevailing torque all metal design

Counterbore Diameter

0.194 inches first end

Mounting Hole Diameter

Between 0.098 inches and 0.103 inches

Nut Style

Plate (floating)

Nut Length

0.948 inches

Nut Height

0.438 inches

Plate Thickness

0.020 inches

Plate Width

0.416 inches

Nut Counterbore Depth

0.250 inches first end

Mounting Hole Arrangement Style

2 holes

Distance From Aperture Center To Mounting Hole Center

Between 0.339 inches and 0.349 inches

Center To Center Distance Between Mounting Holes Along Length

Between 0.686 inches and 0.690 inches

Tempurature Rating

450.0 degrees fahrenheit

Thread Series

Unjf

Thready Qty Per Inch (tpi)

Thread Size

0.190 inches

Material

Steel nut

Material

Steel shell

Surface Treatment

Cadmium nut and chromate nut

Surface Treatment

Cadmium shell and chromate shell

Surface Treatment Specification

Qq-p-416, ty2, cl3 federal specification single treatment response nut

Surface Treatment Specification

Qq-p-416, ty2, cl3 federal specification single treatment response shell

NSN

5310-01-436-3205

Part Number

ST3M521A3-4

Description

Nut,self-locking,plate

CAGE

88277

A nut with a flanged base of varied shapes which may be plain or mounted by rivets, bolts, welding or integral prongs. An integral feature is incorporated for locking on the threads of a mating member.

Part ST3M521A3-4 NSN 5310-01-436-3205

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

05280

FIIG:

A021A0

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:

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: 7318160000
SITC: 69421
End Use: Finished metal shapes
NAICS: 332722
USDA: 1

Freight Class: Nuts of iron or steel