Model: ST3M749-5

Dou Castellated Self-locking Nut

Properties:

Thread Class

Thread Direction

Right-hand

Locking Feature

Prevailing torque all metal design

Nut Style

Castellated, double hexagon

Nut Height

0.276 inches

Width Across Flats

Between 0.492 inches and 0.502 inches

Thread Series

Unjf

Thready Qty Per Inch (tpi)

Hardness Rating

Between 40.0 rockwell c and 44.0 rockwell c

Thread Size

0.312 inches

Thread Pitch In Millimeters

1.058

Bearing Surface Type

Chamfered

Material

Steel comp h11

Surface Treatment

Cadmium

Surface Treatment Specification

Mil-c-8837, ty ii, cl 2 military specification single treatment response

NSN

5310-01-064-6566

Part Number

ST3M749-5

Description

Nut,self-locking,castellated,dou

CAGE

15653

A nut having 12 drive points, 24 sides, flat on the bottom and having a slotted cylindrical or dome shaped upper portion. An integral feature is incorporated for locking on the threads of a mating member. The slots when used in conjunction with a solid or split (cotter) pin, act as an extra "fail safe" feature in critical applications.

Part ST3M749-5 NSN 5310-01-064-6566

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

35607

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:

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:

576

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