Stoppers | McMaster-Carr

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Construction

Thread Length

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UN/UNF (SAE Straight)

19,463 Products

Building and Machinery Hardware

Bumpers

Absorb impact to protect equipment and surfaces from dents and scuffs

1,785 products

Door Stops

Keep doors from slamming into and damaging walls

70 products

Surface Guards

Protect walls and other flat surfaces from impact

89 products

Grommets

Protect wire, cable, and cords from holes with sharp or rough edges

786 products

Door Silencers

Close doors quietly and keep them from rattling in their frames

3 products

Crane Bumpers

Absorb impact to protect your crane—and surrounding walls and beams—when it comes to a stop

20 products

Lockset Bumpers

Protect knobs and hardware on doors from carts, dollies, and other equipment

4 products

Corner Guards

Shield corners on walls and other surfaces from impact

77 products

Edge Trim

Install on panels, boards, signs, and mirrors to protect edges from impact

114 products

Protective Film and Tape

Adhere to surfaces to keep them free of scratches, chemicals, moisture, and germs

93 products

Tubing Guards

Safeguard pipe, tubing, and other round equipment from impact

2 products

Wall Bases

Protect the bottom of walls from foot traffic and impact

12 products

Protective Plugs

Insert into holes in pipe, containers, panels, and parts to keep out debris

1,009 products

Protective Caps

Protect just about anything, including pipe, flanges, screws, and posts

957 products

Leveling Mounts

Level machines and workbenches on uneven surfaces, reduce vibration, and protect floors

249 products

Vibration-Damping Mounts

Attach to machinery to reduce vibration and noise and extend service life

996 products

Protective Feet

Add to furniture and light equipment to protect floors from scratches and wear

203 products

T-Slotted Framing Conveyor End Stops

Halt totes, boxes, and other objects at the end of a T-slotted framing conveyor line

1 product

Door Holders

Mount to doors, walls, or floors to keep doors open

90 products

Door Barricades

Stop intruders from opening doors in your facility during emergency lockdowns

2 products

Door Wedges

Simply slide under doors to keep them open

9 products

Door Chains

Keep free-swinging doors from opening too far and prevent damage to hinges, doors, and walls

7 products

Door Bumpers

Protect large swinging doors from impact where carts and vehicles often push them open

4 products

Door Guides

Keep hanging doors aligned by stopping the bottom from swinging

9 products

Door Tracks

Hang panels to slide over openings when there’s not space for a swinging door

26 products

Adjustable Handles

Lift and turn to easily position and tighten components; also called clamping handles

21 products

Slide-Bolt Latches

Slide the bolt to secure everything from swinging gates to overhead garage doors

9 products

Wheel Clamp Locks

Lock a wheel to prevent forklifts, tuggers, and other vehicles from moving

5 products

Weatherstripping

Seal gaps around doors, windows, and frames

131 products

Window Film

Apply to windows for privacy, insulation, less glare, and a lower chance of shattering

41 products

Fabricating and Machining

Locating and Support Buttons

Secure and position workpieces and fixtures from the bottom or side

168 products

Spring Stops

Push back against workpieces to hold them in place against stops and rails

34 products

Fixture Clamps

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

1 product

Locating Rails

Locate the side of a workpiece in your fixture without milling a permanent slot

8 products

Locating and Support Pads

Position larger workpieces and fixtures than locating and support buttons; also known as rest pads

6 products

Spring Locating Pins

Apply side force to workpieces to clamp them in place

59 products

Spring Locating Pin Installation Tools

Hold spring locating pins in place for installation

6 products

Work Supports

Reduce vibration and deformation by adjusting to secure your workpiece

20 products

Index Plungers

Align parts that have mating bushings for more precision than standard spring plungers

6 products

Fixture Tables

Add clamps, brackets, and other components to build fixtures for welding and assembly

70 products

Fixture Kits

Everything needed to mount workpieces of different sizes to your machine table

1 product

Vise Stops

Prevent horizontal movement within machine vises to keep workpieces in place

5 products

Bar Clamps

Secure large materials with adjustable arms for even pressure distribution

1 product

Drill Stops

Limit how far bits can drill to create identical hole depths every time

145 products

Milling Machine Depth Stops

Avoid cutting too deep by attaching to your machine’s quill

1 product

Lathe Chuck Stops

Consistently position short parts in lathe chucks without spacers to reduce setup time

4 products

Lathe Collet Stops

Prevent parts from pushing back into the collet while machining

3 products

Lathe Spindle Stops

Load material in the same spot every time for consistent machining from piece to piece

3 products

Countersinks

Cut a cone-shaped opening in a hole to install flat-head screws and rivets flush with the surface

67 products

Counterbores

Enlarge the top of a hole to install socket and hex head screws flush with the surface

29 products

Surface-Protection Compounds

Protect surfaces that you don't want to harden when heat treating steel parts

3 products

Power Transmission

Shock Absorbers

Slow and stop loads to reduce impact that can damage equipment like conveyors, lifters, and presses

76 products

Compression Springs

When squeezed, springs push back to their original length

64 products

Die Springs

Support heavy loads with minimal compression in high-impact jobs such as punching and stamping

21 products

Air Springs

Absorb vibration in moving equipment such as conveyors and transfer stations; lift and level loads

25 products

Shaft Collars

Hold and position parts on a shaft, or limit shaft movement

2,725 products

Stopper Cylinders

Extend to stop loads on a conveyor and retract to let them pass

8 products

Parts Metering Cylinders

Space out parts to control flow on conveyors and feeders

12 products

Cylinder Rod Locks

Hold the piston's position during an emergency stop or power loss to keep the load safely in place

6 products

Air Cylinders

Push and pull loads to do everything from stamping materials to sorting parts on conveyors

25 products

Lead Screw Collars

Position components and limit travel along a lead screw

55 products

Machinable Shaft Ends

Mill custom pulleys, threaded hubs, sprockets, collars, and sensor targets and mount them to shafts

56 products

Bearing Nuts

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

412 products

Safety Lockout Valves

Prevent accidental start-up when servicing equipment

40 products

Material Handling

Floor Locks

Stabilize carts, trucks, workbenches, and other mobile equipment during loading and unloading

29 products

Dock Bumpers

Prevent damage to docks and vehicles by absorbing impacts

74 products

Wheel Chocks

Secure wheels in place while loading, unloading, and servicing vehicles

50 products

Railcar Stoppers

Bring slow-moving railcars to a halt until you can install a permanent chock

1 product

Railcar Wheel Stops

Stop railcars at track ends and the approaches to buildings and doors

5 products

Railcar Wheel Chocks

Keep railcars stationary during loading, unloading, and servicing

9 products

Conveyor Guide Clamps

Connect conveyor guides to each other and secure them in place

39 products

Conveyor Guide Mounting Rods

Secure guides and other attachments to conveyors

138 products

Conveyor Guides

Direct and position items on conveyors while keeping them from falling off

114 products

Conveyor Guide Mounting Rod Caps

Cover the ends of conveyor guide mounting rods for a finished look

2 products

Conveyor Stops

Control product flow and let items accumulate

8 products

Conveyors

Roller, skate wheel, ball transfer, belt, and vacuum conveyors

6 products

Conveyor Brackets

Mount guide clamps, sensors, drip pans, and other attachments to conveyor frames

78 products

Conveyor Bracket Spacers

Add distance between brackets and conveyor frames

1 product

Conveyor Accessory Mounts

Position guides or sensors to the exact spot needed for your conveyor

61 products

Wire Rope Stops

Prevent wire rope from pulling out of cleats and guides or keep ends from fraying

33 products

Wire Rope Compression Sleeves

Install a permanent loop at wire rope ends using a compression tool

116 products

Rope Stops

Keep rope from slipping through pulleys and cleats or add a grip to a pull cord

4 products

Rope Compression Sleeves

Install a permanent loop at rope ends using a compression tool

25 products

Rope Ends

Prevent unraveling or seal ends that are starting to come apart

9 products

Compression Tools

Crimp sleeves around rope and wire rope to create loops for attaching fittings

55 products

Wire Rope Clamps

Form a removable loop at the ends of wire rope by tightening the nuts

161 products

Bungee Cord Locks

Position on bungee cords to create stops and keep the cords from rubbing against surfaces

7 products

Scaffold Guardrails

Add a barrier around your scaffold platform to prevent falls

3 products

Electrical Power, Networking, and Controlling

Terminal Blocks

Create tidy rows of wire connections that you can identify, test, and adjust on the spot

279 products

Ferrules

Turn stranded wire into one rigid wire for easy insertion

103 products

Electrical Connector Caps

Protect data connectors when not in use

1 product

Data Port Locks

Block USB or Ethernet ports from unauthorized use

9 products

RJ45 Connector Repair Clips

Snap onto broken Ethernet plugs to restore their ability to make secure connections

1 product

RJ45 Connector Security Clips

Lock Ethernet cords in place to prevent unauthorized removal from ports

3 products

Data Port Plugs

Keep dust, debris, and moisture out of unused computer ports

3 products

DIN Rail Spacers

Slide along rails to separate and organize terminal blocks, relays, and other components

1 product

Cord Stops

Control how much cord retracts into a reel to keep the end accessible

2 products

DIN Rail Stops

Keep components such as terminal locks and relays from shifting on rails

11 products

DIN Rail Caps

Guard the edges of DIN rail from damage and create a finished look

2 products

Wire Sleeving

Bundle wiring and protect from abrasion and heat

12 products

Disconnect Switches

Make sure equipment stays turned off during inspection and maintenance

262 products

Safety Switches

Protect people by cutting power to machines when access doors open; also known as interlock switches

59 products

Transfer Switches

Switch to backup power during an outage

7 products

Motor Switches

Turn motors, lighting, and electric heat circuits on and off

7 products

Switch Padding

Trigger an emergency stop when robot arms contact a worker or object

4 products

Lever Switches

Grip and twist the lever to turn circuits on and off, preventing accidental actuation

2 products

Enabling Switches

Equipment only runs while you press the switch; also known as deadman switches

10 products

Emergency Stop Switches

Cut power to equipment during emergencies

143 products

Pendant Switches

Control machinery, such as cranes, hoists, and trolleys, from a safe distance

15 products

Pull Switches

Tug on a cable or rope to turn on and off circuits, often for production lines along conveyors

2 products

Finger-Touch Switches

Lightly touch with your finger to turn circuits on and off

21 products

Rocker Switch Rockers

Combine with a base and lens to create a custom rocker switch

1 product

Push-Button Switches

Our most common switch type actuates circuits with the push of a button

196 products

Enclosure Door Switches

Control fans, lights, and other devices inside your enclosure when you open and close the door

2 products

Tablet Holders

Equip tablets with safety switches to halt robots, conveyors, and other machinery in an instant

3 products

Capacitor Boots

Shield capacitors and wire connections to extend their service life and reduce accidental shocks

3 products

Fluid Handling

Expansion Plugs

Seal pipe and tubing lines when checking for leaks

346 products

On-Off Valves

Start and stop flow through a line

4,242 products

Bore Sealing Plugs

Permanently seal unthreaded holes in pneumatic and hydraulic components

95 products

Heat Exchanger Plugs

Plug leaky internal tubes in heat exchangers

17 products

Pipe and Pipe Fittings

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

24 products

Injection Valves

Pump liquid into your process line or tank while preventing backflow

4 products

Containers, Storage, and Furniture

Hanging Hooks

Hang tools, hoses, garments, and other supplies on walls for easy access

2 products

Hose Stops

Prevent hose from winding all the way back onto reels; also known as bumper or ball stops

7 products

Workbench Back and End Stops

Keep tools and parts from sliding off workbenches

13 products

Fastening and Joining

Sealing Washers

Prevent fluids from leaking around fasteners

352 products

Cushioning Washers

Cushion joints to dampen vibration and protect them from wear

124 products

Threaded Rod Collars

Hold and position parts on a threaded rod

76 products

Brazing Stop-Off

Keep flux and metal from flowing into unwanted areas while brazing

2 products

Facility and Grounds Maintenance

Floor Drain Trap Seals

Stop sewer gases from escaping through rarely used floor drains if the P-trap dries out

4 products

Shower Stoppers

Push down to plunge and cut trapped material to prevent clogs

1 product

Sink Drain Stoppers

Plug drains to fill up sinks and tubs

5 products

Sink Drains

Empty liquids from sinks into sewer lines

35 products

Flush Valve Replacement Parts

Replace virtually any part in the most common flush valve brands

15 products

Rebar Caps

Brightly colored to alert workers to exposed rebar and pipe

4 products

Measuring and Inspecting

Coordinate Measuring Machine Plates and Fixtures

Raise workpieces and position them on a fixture plate

126 products

Straightedges

Draw straight lines and check the straightness of surfaces

4 products

Safety Equipment

Parking Curbs

Designate parking spaces and block drivers from pulling too far into a space

6 products

Bollards

Anchor to the ground or floor to block vehicle access

26 products

Guardrails

Protect pedestrian walkways from vehicles

92 products

Barricades

Panel, rail, cone-mount, barrel, and water-fill barricades

22 products

Spill-Control Berms

Form a barrier around leaks and spills to stop them from spreading

35 products

Spill-Control Drain Covers

Block grates and manholes so liquid can't get in and odors can't get out

7 products

Floor Drain Plugs

Prevent oil and other spills from going down your floor drain

3 products

Fire Sprinkler Head Stoppers

Prevent water from spraying without shutting down your entire fire sprinkler system

1 product

Fire Sprinkler Heads

Replace the heads in your fire sprinkler system

33 products

Spark-Resistant Film

Stick to vertical surfaces to shield them from sparks while welding or grinding

1 product

Fire Stops

Prevent fire and smoke from passing through holes in fire-resistant walls and floors

59 products

Communication

Legend Plates

Mark switches and lights on control panels for easy identification

15 products

Tamper-Evident Seals

Secure hasps, latches, and other connections to visibly indicate tampering

2 products

Lighting

Landscape Lights

A directed beam of light illuminates paths, signs, flags, and landscape elements

4 products

Sealing

Sealants

Fill and seal gaps in metal, plastic, wood, and other materials

3 products