M6 Nuts | McMaster-Carr

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Corrosion-Resistant Coated

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Unified Standard Class 2A

Unified Standard Class 2B

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1,391 Products

Fastening and Joining

Hex Nuts

Handle most general fastening needs

57 products

Locknuts

Hold fasteners in place to prevent loosening from vibration

34 products

Flange Nuts

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

34 products

Cap Nuts

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

10 products

Thumb Nuts

Easy to tighten and loosen by hand for making frequent adjustments

22 products

Coupling Nuts

Connect and extend threaded rods

15 products

Square Nuts

Flat sides won’t spin in channels and square holes

7 products

Socket Nuts

Install in recessed holes and tight spots where a wrench won’t fit; also known as Allen nuts

2 products

Tamper-Resistant Nuts

Hard to detach without special tools to prevent unwanted removal

9 products

Slotted Round Nuts

Fasten with a screwdriver in tight spots where there's no room for a wrench

1 product

Sealing Nuts

Prevent leaks and block out contaminants with a rubber seal

1 product

Split Nuts

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

1 product

Press-Fit Nuts

Push into drilled or punched holes to add threads to thin panels

29 products

Rivet Nuts

Add threads to thin panels with access from only one side; also known as blind inserts

56 products

Weld Nuts

Weld to metal surfaces to add permanent threads

30 products

Clip-On Nuts

Slide onto the edge of thin panels to create a fastening point

12 products

Threaded Inserts

Create new threads or repair stripped threads

155 products

Snap-In Nuts

Push into square holes in thin materials to add bolts for aligning off-center parts

10 products

Adhesive-Mount Nuts

Attach threads to material that’s too thin for a threaded insert

18 products

Binding Barrels

Create custom low-profile fasteners with binding barrel posts, caps, and screws

24 products

Thread Adapters

Join threads of a different type, size, and gender

395 products

Standoffs

Separate, position, or connect components in assemblies

74 products

Studs

Press, weld, or screw in place to add a threaded fastening point

27 products

Thumb Screws

Tighten and loosen by hand without the need for tools

Install and remove blind, solid, hollow, and other types of rivets

1 product

Sockets

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

1 product

Building and Machinery Hardware

T-Slotted Framing Fasteners

Secure brackets and other accessories to T-slotted rails

48 products

Locking-Slotted Framing and Fittings

Make platforms, bases, and other structures that stand up to more movement than T-slotted framing

3 products

Clamp-On Framing and Fittings

Two-piece fittings let you modify assembly stations, conveyors, and racks without dismantling them

1 product

Strut Channel Framing and Fittings

Secure fittings in the U-shaped channel to route conduit and pipe or build other structures

13 products

Fabricating and Machining

T-Slot Nuts

Combine with setup studs or bolts to mount fixtures to machine tables

13 products

T-Slot Bolts

Secure clamps and workpieces to machine tables with quicker setup than a T-slot nut and stud

9 products

Setup Studs

Secure setup clamps and fixtures to your machine table or assemble heavy machines

40 products

Fixture Clamps

Secure your workpiece to a fixture table so it won't move during machining

6 products

Lathe Chuck Jaw Nuts

Secure jaws to a CNC lathe chuck

1 product

Power Transmission

Lead Screw Collars

Position components and limit travel along a lead screw

2 products

Ball Screws and Nuts

Provide smooth travel where high speeds, accurate positioning, and repeatable movement are required

4 products

Material Handling

Eye Nuts

Pair with bolts or threaded rod to lift and hang components

5 products