Metric Fasteners | McMaster-Carr

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39,742 Products

Fastening and Joining

Socket Head Screws

Socket Head Screws

With a deeper drive than flat and rounded head screws, these withstand more torque for a tighter hold

Rounded Head Screws

Rounded Head Screws

Sit just above the surface for a low-profile finish and hold tighter than flat head screws

Hex Head Screws

Hex Head Screws

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

Flat Head Screws

Flat Head Screws

Fit in countersunk holes for a flush finish

Set Screws

Exert pressure at the tip to hold parts in place, unlike screws that hold material together with threads

Shoulder Screws

Shoulder Screws

Rotate parts around the cylinder under the head to guide and align them during installation

Tapping Screws

Fasten a range of materials together without needing to tap the hole first

Tighten and loosen by hand without the need for tools

Fastener Assortments

Fastener Assortments

Stay prepared by keeping fasteners in common sizes and materials on hand

12-Point Screws

12-Point Screws

12 contact points handle more torque than a hex head while a flange eliminates the need for a washer

Carriage Bolts

A smooth head provides a finished look while a square neck keeps the bolt in place when using a nut

Captive Panel Screws

Captive Panel Screws

Secure panels and enclosures while still having access to them

Studs

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

Wood Screws

Fasten material to wood or pieces of wood to each other

Elevator Bolts

Create a flush joint to allow movement in tight spaces such as grain elevators and belting systems

Hanger Bolts

Suspend pipe and other fixtures with wire or cable ties

Hex Nuts

Handle most general fastening needs

Flange Nuts

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

Locknuts

Hold fasteners in place to prevent loosening from vibration

Panel Nuts

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

Coupling Nuts

Connect and extend threaded rods

Easy to tighten and loosen by hand for making frequent adjustments

Cap Nuts

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

Tamper-Resistant Nuts

Tamper-Resistant Nuts

Hard to detach without special tools to prevent unwanted removal

Square Nuts

Flat sides won’t spin in channels and square holes

Slotted Round Nuts

Slotted Round Nuts

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

Split Nuts

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

Socket Nuts

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

Sealing Nuts

Prevent leaks and block out contaminants with a rubber seal

Threaded Inserts

Threaded Inserts

Create new threads or repair stripped threads

Clip-On Nuts

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

Press-Fit Nuts

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

Rivet Nuts

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

Adhesive-Mount Nuts

Adhesive-Mount Nuts

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

Weld Nuts

Weld to metal surfaces to add permanent threads

Snap-In Nuts

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

Push Nuts

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

Threaded Rods

Anchor, connect, or hang components in a wide variety of applications

Washers

Nearly every size and shape imaginable, from flat washers to clipped to curved

Lock Washers

Resist vibration to prevent fasteners from loosening

Sealing Washers

Sealing Washers

Prevent fluids from leaking around fasteners

Finishing Washers

Finishing Washers

Screw heads sit flush to prevent snagging and to create a neat, finished appearance

Leveling Washers

Leveling Washers

Curved or tapered to compensate for uneven mounting surfaces

Insulating Washers

Insulating Washers

Isolate screws from electrical current and prevent corrosion from mating different metals

Cushioning Washers

Cushioning Washers

Cushion joints to dampen vibration and protect them from wear

Quick-Release Pins

Quick-Release Pins

Fasten or remove components on equipment with a spring-loaded retaining ball

Quick-Release Pin Receptacles

Quick-Release Pin Receptacles

Secure quick-release pins when you don’t have a through hole

Quick-Release Pin Retaining Caps

Quick-Release Pin Retaining Caps

Hold quick-release pins in holes that are oversized or out of round

Dowel Pins

Align parts before assembly or use as a pivot, shaft, or hinge to join moving components

Spring Pins

Squeeze and insert into tight holes to hold parts in place with tension

Clevis Pins

Secure parts in place and lock with a cotter pin or retaining ring

Captive Pins

Press into holes in thin materials like panels and circuit boards to permanently join or align them

Cotter Pins

Secure the ends of clevis pins and shafts to keep components in place

Taper Pins

Fit snugly into tapered holes to secure, position, and align components

Standoffs

Threaded to separate or connect parts as well as position components in assemblies

Spacers

Unthreaded to create space between two surfaces or objects, often to align them

Rivets

Join materials together permanently, especially when too thin or fragile to fasten with screws

Retaining Rings

Retaining Rings

Hold components on a shaft

Thread Adapters

Thread Adapters

Join threads of a different type, size, and gender

Binding Barrels and Screws

Binding Barrels and Screws

Thread together for a low-profile fastener

Single-End Studs

Single-End Studs

Use the unthreaded end as a pivot point, hinge, shaft, or locator pin

Anchors

Secure structural joints in concrete, brick, and other building materials

Shims

Level, align, and adjust spacing on fasteners, shafts, and machine components

Shim Stock

Cut into custom shapes for leveling and aligning fasteners, machinery components, and more

Unthreaded Inserts

Unthreaded Inserts

Reinforce, align, and adjust joints as you tighten a fastener

Push Nut Installation Tools

Push Nut Installation Tools

Press nuts and retaining rings onto threaded fasteners and shafts

Rivet Nut Tools

Rivet Nut Tools

Install rivet nuts

Power Transmission

Bearing Nuts

Hold bearings, bushings, pulleys, and gears in place on threaded shafts and spindles

Bearing Lock Washers

Bearing Lock Washers

Lock bearing nuts in place to prevent loosening due to vibration

Shock Absorber Mounting Nuts

Shock Absorber Mounting Nuts

Secure shock absorbers after threading them into mounting blocks

Lead Screws and Nuts

Lead Screws and Nuts

Components travel along a screw with broad, square threads to clamp and lift heavy loads

Rod Ends

Use with connecting rods to support loads and control steering, tensioning, or pivoting motion

Rod End Nuts

Attach to rods, pipe, and tubing to make pivot and hinge points

Connecting Rods

Connecting Rods

Use with rod ends and swivel joints to link components in push/pull assemblies

Ball Screws and Nuts

Ball Screws and Nuts

Internal ball bearings roll on screws for low friction when moving components at high speeds

Ball Screw/Splines

Ball Screw/Splines

Transmit rotary power, move loads along the shaft, or do both at once

Roller Screws and Nuts

Roller Screws and Nuts

More contact points to move heavier loads than ball and lead screw assemblies

Lead and Ball Screw End Supports

Lead and Ball Screw End Supports

Brace and secure the ends of lead screws and ball screws

Building and Machinery Hardware

T-Slotted Framing Fasteners

T-Slotted Framing Fasteners

Secure brackets and other accessories to T-slotted rails

T-Slotted Framing Structural Brackets

T-Slotted Framing Structural Brackets

Join T-slotted rail surfaces and corners to build virtually any structure

T-Slotted Framing Braces

T-Slotted Framing Braces

Reinforce joined corners of T-slotted rails for a sturdier connection than structural brackets

T-Slotted Framing Brace Ends

T-Slotted Framing Brace Ends

Pair with a T-slotted rail to make a brace of any length

Strut Channel Framing and Fittings

Strut Channel Framing and Fittings

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

Locking-Slotted Framing and Fittings

Locking-Slotted Framing and Fittings

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

Knobs

Position, tighten, and secure fixtures and equipment

Cam Handles

For fast clamping, push down on the handle to draw two parts together

Machine Handles

Machine Handles

Arms give you extra leverage to secure and position jigs, fixtures, and other equipment

Handle Nuts

Attach to threaded shafts to quickly turn the shafts by hand

Leveling Mount Inserts

Leveling Mount Inserts

Slip onto equipment and furniture to add threaded-stud leveling feet

Material Handling

Loop Clamps

Hold pipe snug against the mounting surface to prevent movement that may cause breakage

U-Bolts

Anchor heavy pipe, tube, and conduit; stronger than routing clamps and hangers

Eyebolts

Route rope through the loop or attach hooks and shackles for lifting

Hoist Rings

Pivot to resist stress that would bend or break an eyebolt when lifting at an angle

Eye Nuts

Pair with bolts or threaded rod to lift and hang components

Cable Holders

Mount to a surface to secure and route cable

Fabricating and Machining

Setup Studs

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

T-Slot Bolts

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

T-Slot Nuts

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

T-Slot Covers

Snap into T-slots to block chips, debris, and small parts from falling in

T-Slot Cleaners

T-Slot Cleaners

Scrape debris out of machine table T-slots

T-Slot Nut and Setup Stud Kits

T-Slot Nut and Setup Stud Kits

Mount fixtures of different sizes to your machine table

Drill Bushings

Fit in holes to guide drill bits and other cutting tools for precise and repeatable holes and cuts

Clamps

Hold workpieces securely in place

Ejector Pins

Push finished parts out of molds

Core Pins

Add to molds and pour in plastic to form holes in finished parts

Lathe Chuck Jaw Nuts

Lathe Chuck Jaw Nuts

Secure jaws to a CNC lathe chuck

Fluid Handling

Hose and Hose Fittings

Hose and Hose Fittings

Flexible and stronger than tubing; often used to convey liquids and gases under pressure

Pipe and Pipe Fittings

Pipe and Pipe Fittings

Generally thicker and more rigid than tubing for distributing liquids and gases through your facility

Tube and Tube Fittings

Tube and Tube Fittings

Typically more flexible than pipe for carrying liquids and gases in short runs around equipment

Electrical

Conduit and Conduit Fittings

Conduit and Conduit Fittings

Protect wiring from impact and the environment in runs indoors, outdoors, and underground

DIN Rail Mounting Adapters

DIN Rail Mounting Adapters

Attach to components not made for DIN rail and clip on to install

Communication

Reference Charts

Reference Charts

Check decimal equivalents, drill sizes, or specifications for socket screws

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