External Hex Nuts | McMaster-Carr

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System of Measurement

Thread Size

4-40 to 5/16"-32

Material

Stainless Steel

Nut Type

Tamper Resistant

With Sight Hole

Hex Nut Profile

Finish

Black Zinc Plated

Cadmium Yellow-Chromate Plated

Corrosion-Resistant Coated

Hot-Dipped Galvanized

Magnesium Phosphate Coated

Phosphate Coated

Zinc Flake Coated

Height

Width

Fastener Strength Grade/Class

Thread Direction

Thread Pitch

Thread Type

Thread Spacing

Locking Type

Distorted Thread

Two-Piece Clamp

Specifications Met

Federal Specification

Performance

Changeable Shaft

Chemical Resistant

Corrosion Resistant

Electrically Insulating

Extra Clearance

Extra-Strong Grip

Fastener Holding

Flame Retardant

Fastener Strength Rating

Thread Fit

Metric Class 6g

Metric Class 6G

Metric Class 6H

Unified Standard Class 2A

Unified Standard Class 2B

Unified Standard Class 3B

Color

Length

RoHS

Compliant with Exemptions

DFARS Specialty Metals

REACH

Washer Material

Stainless Steel

Export Control Classification Number (ECCN)

How can we improve?

12,557 Products

Fastening and Joining

Hex Nuts

Handle most general fastening needs

Locknuts

Hold fasteners in place to prevent loosening from vibration

Flange Nuts

The flange distributes pressure, so you don't need a washer

Cap Nuts

Cover and protect threads while adding a finished look; also known as acorn nuts

Coupling Nuts

Connect and extend threaded rods

Panel Nuts

Extremely thin for tight spots such as electrical panels; also known as dress nuts

Sealing Nuts

Prevent leaks and block out contaminants with a rubber seal

Tamper-Resistant Nuts

Tamper-Resistant Nuts

Hard to detach without special tools to prevent unwanted removal

Split Nuts

Swivel to attach at any point on a threaded rod for quick installation

Push-Button Nuts

Push-Button Nuts

Disengage the threads to quickly slide along threaded rods

Easy to tighten and loosen by hand for making frequent adjustments

Thread Adapters

Thread Adapters

Join threads of a different type, size, and gender

Push Nuts

Press onto threads for a light duty hold that’s faster to install than typical nuts

Hex Head Screws

Hex Head Screws

Used with nuts to create a stronger joint than flat and rounded screws

Fastener Assortments

Fastener Assortments

Keep a variety of common screws, nuts, and washers on hand

Joint Clamps for Wood

Joint Clamps for Wood

Make secure joints between boards, butcher blocks, and countertops

Nut Starters

Begin turning nuts in hard-to-reach spots

Nutdrivers

Tighten and loosen nuts and bolts

Nutdriver Bits

Pair with nutdrivers to turn hex nuts and cap screws

Screwdriver/Nutdrivers

Screwdriver/Nutdrivers

Quickly switch between driving screws and driving nuts

Sockets

Turn fasteners with an external drive style without slipping and damaging the drive

Socket Wrenches

Socket Wrenches

Apply torque to turn nuts, bolts, and other fasteners without rounding the heads

Fabricating and Machining

Clamping Screws

Clamping Screws

Apply pressure through a flat-tipped screw to hold material in place

Material Handling

Turnbuckle Nuts

Turnbuckle Nuts

Tighten against a turnbuckle body to prevent the end fitting from unscrewing

Building and Machinery Hardware

T-Slotted Framing and Fittings

T-Slotted Framing and Fittings

The most versatile system, attach fittings along the continuous slots to build virtually anything

Power Transmission

Lead Screws

Pair with lead screw nuts to move components in a straight line

Electrical

Electrical Enclosure Fasteners

Electrical Enclosure Fasteners

Mount components to your enclosure without worrying about leaks

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)