Safety Caps | McMaster-Carr

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Product Family

Air Conditioner Service Valve Caps

Air Conditioner Service Valves

Bolt-Together Framing and Fittings

Material

Aramid/Carbon Fiber Fabric

Hastelloy C276 Nickel

System of Measurement

Pipe Size

Shape

Adjustable-Angle Elbow

Fitting Type

Thread Type

Chicago Fire Department

Gender

Thread Size

Color

Brown/Dark Brown/White

For Use With

90° Angles

Abrasive Materials

ABS Pipe

Alcohol-Based Solvents

Deutsch Style Connectors

Number of Poles

Length

REACH

RoHS

Compliant with Exemptions

Not Compliant

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Export Control Classification Number (ECCN)

DFARS Specialty Metals

Performance

Connect Under Pressure

Attachment Type

Band-and-Buckle Clamp

Clamp On

Cord

Crimp-On Hose Ferrule

Pipe Material

Maximum Temperature

Pressure Class

Electrical Connection

Apple-Compatible 30 Pin

17,877 Products

Most Likely Products

Protective Caps

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

1,069 products

Power Connector Caps

Cover pin-and-sleeve power connectors when they're not in use

38 products

Gas Tank Safety Caps

Protect valves on high-pressure gas tanks without having to remove the regulator

1 product

All Results

Building and Machinery Hardware

Protective Caps

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

1,069 products

Protective Plugs

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

1,009 products

Strut Channel Framing and Fittings

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

111 products

Press-Fit Framing End Caps

Push into press-fit rails for a finished look that keeps out debris

2 products

Clamp-On Framing End Caps

Fit into the end of clamp-on framing rails to use as a cover or foot

1 product

Bolt-Together Framing End Caps

Cover the rough ends of bolt-together framing rails for a finished look

1 product

T-Slotted Framing and Fittings

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

127 products

Locking-Slotted Framing End Caps

Snap onto locking-slotted rails to protect the ends and keep out dust and grime

1 product

Slip-On Framing and Fittings

Insert rails into fittings and tighten screws to make guards, railings, and racks

27 products

Protective Feet

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

279 products

Leveling Mounts

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

10 products

Leveling Mount Inserts

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

113 products

Lockouts

Ensure that machines stay turned off to prevent accidents during maintenance work

4 products

Keyhead Covers

Color-code your keys for easy identification

2 products

Door Drip Guards

Divert rain and snow away from door openings

13 products

Knobs

Position, tighten, and secure fixtures and equipment

503 products

Corner Guards

Shield corners on walls and other surfaces from impact

6 products

Hand Grips

Cover handles so they're more comfortable and secure to hold

182 products

Electrical Power, Networking, and Controlling

Power Connector Caps

Cover pin-and-sleeve power connectors when they're not in use

38 products

Power Connectors

Plugs, sockets, receptacles, and other connectors for powering equipment

930 products

Mil. Spec. Connectors

Meet strict military standards or are compatible with Mil. Spec. connectors

167 products

Ecomate Connectors

Connect machine tools, robots, and other vibrating equipment

14 products

Audio Connectors

Plugs, sockets, receptacles, and adapters to make audio connections

10 products

USB Connectors

Plugs, sockets, receptacles, and adapters to make USB connections

20 products

Coaxial Connectors

Plugs, sockets, receptacles, and adapters to make coaxial connections

59 products

Solenoid Valve Sockets

Pair with plugs or receptacles to connect solenoid components

11 products

RJ45 Connectors

Plugs, sockets, and receptacles to make Ethernet connections

38 products

Ballast Connectors

Avoid exposure to live wires when replacing fluorescent ballasts

2 products

ix Industrial Sockets

Pair with plugs to add ix Industrial connections to printed circuit boards

6 products

AMP Connectors

Build-your-own and ready-to-use AMP connectors

80 products

Molex Connectors

Plugs, sockets, and housings for making Molex connections

160 products

Breakaway Connectors

If pulled or stressed, these disconnect without damaging cables and equipment

3 products

Latching Connectors

Protect connections in wet or harsh environments while keeping them accessible

206 products

Sure Seal Connectors

A PVC housing keeps out liquids and dust and resists chemicals

6 products

DMX Connectors

Replace damaged plugs and sockets on lighting cables

2 products

Mini Connectors

Plugs, sockets, and receptacles send power and control signals to equipment and automated systems

24 products

Micro 360 Connectors

Plugs and sockets to make control and data connections in tight spaces

24 products

Metric Circular Connectors

Plugs, sockets, receptacles, and adapters for equipment with metric connections

334 products

Amphenol Connectors

Attach wires to a circuit board

32 products

D-Sub Connectors

Plugs, sockets, receptacles, and adapters for connecting computers, monitors, and printers

145 products

Han Connectors

Plugs and sockets to make Han connections

8 products

CB Radio Sockets

Pair with receptacles to connect CB radios

1 product

HDMI Adapters

Convert one HDMI size or style to another

14 products

RJ45 Connector Caps

Protect sockets and maintain the IP67 rating when not in use

1 product

RJ45 Connector Security Clips

Lock Ethernet cords in place to prevent unauthorized removal from ports

3 products

Coaxial Connector Caps

Terminate the end of an unused coaxial cable

2 products

USB Connector Caps

Shield unused USB connectors from damage, contaminants, and moisture

3 products

Metric Circular Connector Caps

Keep metric circular connectors safe when they're not in use

11 products

RJ45 Connector Repair Clips

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

1 product

Mil. Spec. Connector Caps

Protect Mil. Spec. connectors when they're not in use

12 products

Mini Connector Caps

Shield mini connectors when they're not in use

13 products

Wire Splices, Connectors, and Taps

Join wire and protect the connection

378 products

Terminal and Splice Kits

Maintain a supply of extra terminals and splices to join and terminate wire

17 products

Terminal Covers

Block out dirt and corrosion to protect battery terminals

20 products

Wire Splice Bits

Install twist-on wire splices using a power screwdriver or drill

2 products

Wire Splice Screwdrivers

Install twist-on wire splices

2 products

Wire Splice Covers

Seal out dust and moisture to protect electrical connectors

3 products

Data Port Locks

Block USB or Ethernet ports from unauthorized use

9 products

Data Port Plugs

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

3 products

Metric Circular Cords

Send power and control signals to equipment with metric connections

500 products

Power Cords

Connect equipment and devices to a power source

9 products

USB Chargers

Power up mobile devices and other electronics

27 products

Welding Cable Connectors

Plugs and sockets to deliver power to welding cable

13 products

USB Cords

Transfer data between computers, printers, and mobile devices

260 products

Electrical Insulating Wire Caps

Cover live wire ends to protect against shock from accidental contact

3 products

Circuit Breaker Box Filler Plates

Conceal live electrical components in circuit breaker boxes to prevent injury and damage

2 products

Fuse Block Safety Covers

Prevent accidental shocks when handling fuse blocks and fuses

4 products

Heat-Shrink Tubing End Caps

Seal moisture out of crimped electrical connections

22 products

Electrical Enclosure Plugs

Block or seal holes in outlet boxes and enclosures to keep out debris, dust, and moisture

77 products

Outlet Boxes

House electrical components such as on-off switches, receptacles, and dimmer knobs

7 products

Electrical Enclosure Vents

Attach to sealed enclosures so air can flow to equalize temperature and pressure

10 products

Electrical Enclosure Drains

Release moisture to keep components dry

4 products

Weatherheads

Bring power into buildings and protect the entry point from rain and snow

10 products

Outlet Box Covers

Enclose wiring for outlets and switches or block off unused components

85 products

DIN Rail Caps

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

2 products

Cold-Shrink Tubing End Caps

Seal crimped electrical connections without heat or tools to protect against moisture

4 products

Electrical Enclosure Drain Vents

Prevent moisture from getting trapped inside enclosures while letting air flow through

6 products

Battery Vent Caps

Flip open to check water levels and fill wet-cell batteries

1 product

Capacitor Boots

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

3 products

Circuit Board Connectors

Connect flat flexible cable to circuit boards

10 products

Containers, Storage, and Furniture

Gas Tank Safety Caps

Protect valves on high-pressure gas tanks without having to remove the regulator

1 product

Gas Tank Safety Collars

Protect valves on acetylene tanks without having to remove the regulator

1 product

Drum Plug Caps

Access inside drums to fill them

4 products

Fuel Caps

Seal fuel tanks on trailers, compressors, and other equipment

2 products

Drum Plugs

Seal drum lid openings

27 products

Drum Locks

Secure drum lids and openings to prevent tampering

2 products

Dust Covers

Stretch over drums, pails, and other objects to keep out dust and debris

16 products

Drum Covers

Protect drum lids from damage and rust

10 products

Vial Caps

Take samples from vials without removing the cap

15 products

Drum Locking Rings

Clamp lids onto drums for a tight seal

7 products

Drum Lids

Replace the lid on your drum

16 products

Pail Lids

Replace the lid on your pail with one that quickly screws open and closed

2 products

Hard Hat Bags

Protect your hard hat from sunlight and other damaging elements to extend its life

1 product

Helmet Bags

Carry your helmet and shield it from scratches, dents, and rain

1 product

Stacking Caps and Targets

Turn the ends of posts into stackable shelving and rack systems

6 products

Pegboard Hook End Caps

Slide onto the end of pegboard hooks to protect items from scratches

2 products

Hard Hat Racks

Keep hard hats close at hand, but out of the way

6 products

Knife Sheaths

Safely store knives while protecting them from damage

7 products

Safety Equipment

Toe and Foot Guards

Slip over shoes or boots to shield feet and toes from impact

27 products

Hats

Shield your head from sun, rain, cold, and sparks

28 products

Earplugs

Protect your hearing in loud environments without the bulk of earmuffs

98 products

Bandanas

Keep sun, dust, and sweat off your face

3 products

Hard Hat Cooling Pads

Soak in water to keep your head cool

5 products

Hard Hats

Protect your head from falling objects

97 products

Hard Hat Liners

Layer under your hard hat for extra warmth

17 products

Bump Caps

Guard against minor head bumps and scrapes

50 products

Hard Hat Windsocks

Stretch over your hard hat to block wind and cold

5 products

Hoods

Shield your head and neck from dirt, heat, cold, and electrical and welding sparks

41 products

Face Shields

Protect your face from dirt, chemical splashes, and electrical and welding sparks

4 products

Clothing Kits

Head-to-toe protection from electrical arc flashes, chemical splashes, welding sparks, and more

11 products

Earmuffs

Dampen loud noises to protect hearing

31 products

Hair Covers

Catch stray hairs before they contaminate food

12 products

Sweatbands

Absorb sweat from your head or arms

8 products

Bump Cap Inserts

Tuck inside a baseball cap to protect your head from bumps and scrapes

4 products

Earmuff and Headset Covers

Keep shared earmuffs, headsets, and headphones germ-free without sterilizing them

2 products

Ear Warmers

Wrap behind your head to shield your ears from the cold and wind

1 product

Bicycle Helmets

A multi-directional impact protection system (MIPS) reduces injury risk

1 product

Neck Gaiters

Protect your neck and face from cold, heat, flames, and electrical hazards

6 products

Earplug Fit Testers

Confirm your earplugs deliver the right level of hearing protection

1 product

Fire Hydrant Plugs

Pair with a hook-style spanner wrench to quickly seal fire hydrants and washdown equipment

3 products

Fire Hydrant Caps

Pair with a hook-style spanner wrench to quickly cover and uncover fire hydrants

6 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

Bearing Guards

Shield bearings from dirt, and protect fingers and tools from moving parts

20 products

Material Handling

Ladder Pads

Cushion the top of ladders to protect surfaces

1 product

Conveyor Guide Mounting Rod Caps

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

7 products

Valve Stem Caps

Keep dust and debris out of tire valves

2 products

Pallet Load Covers

Fit over boxes on pallets to shield the tops and edges from strapping gouges and impact

3 products

Fluid Handling

Pipe and Fittings

Generally thicker and more rigid than tubing for distributing liquids and gases

3,510 products

Hose Fittings

Create threaded, barbed, quick-disconnect, and other types of connections between lengths of hose

1,560 products

Tube Fittings

Make threaded, push to connect, barbed, and other types of connections between lengths of tube

1,139 products

Tubing Flow Stops

Temporarily block water flow to make soldering repairs without waiting for your line to drain

18 products

Pipe Vent Caps

Keep rain and debris out of vertical exhaust pipe

5 products

Pressure-Relief Valves

Protect equipment by opening at a set pressure and closing when the pressure drops; for repeated use

17 products

Breather Vents

Maintain even pressure and vacuum as temperatures change by allowing airflow in tanks and enclosures

155 products

Expansion Plugs

Seal pipe and tubing lines when checking for leaks

346 products

Sights

Observe and monitor the contents of pipes, tanks, and other containers

243 products

Heat Exchanger Plugs

Plug leaky internal tubes in heat exchangers

17 products

Air Vent Valves

Eliminate air pockets from fluid lines to maintain consistent flow and prevent surges

39 products

Bore Sealing Plugs

Permanently seal unthreaded holes in pneumatic and hydraulic components

95 products

Facility and Grounds Maintenance

Rebar Caps

Brightly colored to alert workers to exposed rebar and pipe

4 products

Protective Coatings

Shield surfaces from the surrounding environment

1 product

Sink Drain Strainers

Catch debris to prevent clogs and plug drains to fill sinks

6 products

Sink Drains

Empty liquids from sinks into sewer lines

47 products

Sink Drain Stoppers

Plug drains to fill up sinks and tubs

5 products

Chain Link Fencing

Everything you need to build or repair a chain link fence, from posts to gates

5 products

Fence Posts

Secure and hold up fencing

10 products

Drain Cleanouts

Create an access point to inspect and clean floor drain pipelines

3 products

Shampoo Caps

Remove contaminants from your hair with no rinsing required

2 products

Lubricating

Grease Fitting Adapters

Mate grease fittings when the sizes and thread types don't match

41 products

Grease Fittings

Create an inlet on equipment and machinery for injecting lubricant; also known as Zerk fittings

360 products

Grease Fitting Manifolds

Lubricate multiple points with the same amount and type of grease using one grease fitting

3 products

Grease Fitting Repair Tools

Remove and repair broken or clogged grease fittings and re-tap threaded holes

2 products

Grease Fitting Caps

Protect grease fittings from dirt, debris, and moisture

14 products

Grease Fitting Installation Tools

Tap to insert grease fittings in unthreaded holes

2 products

Grease Fitting Cleaning Tools

Flush out old grease, dirt, and debris from clogged fittings

2 products

Grease Fitting Junction Blocks

Send different types and amounts of grease from multiple grease fittings to lubricate several points

9 products

Communication

Labels

Stick onto items to identify or convey information about them

17 products

Tamper-Evident Seals

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

2 products

Marking Cones

Designate areas for material identification, inventory control, and pallet staging

6 products

Headsets

Make calls from computers and other devices or communicate over two-way radios

3 products

Fastening and Joining

Press-Fit Nuts

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

2 products

Push Nuts

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

7 products

Threaded Inserts

Create new threads or repair stripped threads

1 product

Cap Nuts

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

423 products

Retaining Rings

Hold components on a shaft

296 products

Quick-Release Pin Receptacles

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

36 products

Standoff Caps

Create a finished look on standoffs and protect them from dirt and debris

66 products

Quick-Release Pin Retaining Caps

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

23 products

Socket Retaining Rings

Secure sockets and adapters to impact tools

39 products

Cartridge Sealing Caps

Slip over the tips of adhesive and sealant cartridges to keep contents from hardening

1 product

Measuring and Inspecting

Variance Indicator Caps

Cover and color-code the spindle on your variance indicator

1 product

Caliper Battery Covers

Protect the battery inside your caliper

8 products

Voltage Detectors

Check for voltage in receptacles, cables, and electrical components

3 products

Fabricating and Machining

Clamp Holding Screw Tips

Cover metal holding screws to protect workpieces from scratches

12 products

Clamp Holding Screws

Replace worn holding screws in clamps or customize with different sizes or styles

52 products

Vise Jaw Liners

Place over vise jaws to protect workpieces from marring

50 products

Tooling Ball Covers

Protect tooling balls when not in use

3 products

Tweezer Tip Caps

Protect tweezer tips from damage

1 product

Sanding Bits

Smooth out small, recessed, and hard-to-reach areas, and also remove paint and rust

210 products

Jaw Covers for Pliers

Cover the jaws of slip-joint pliers to protect the finish of your workpiece

2 products

Fixture Plate Plugs

Keep chips and shavings from clogging or damaging unused holes on fixture plates in milling machines

8 products

Power Transmission

Die Spring Screw Caps

Brace springs and control tension in die sets while simplifying maintenance

10 products

Heating, Ventilation, and Air Conditioning

Duct and Fittings

Circulate air through HVAC systems using round, rectangular, and fabric duct

145 products

Air Diverters

Guide air toward your workspace or deflect unwanted drafts

9 products

Air Conditioner Service Valves

Tap into refrigerant lines to drain and fill your system

18 products

Air Conditioner Service Valve Caps

Seal off AC service valves to prevent refrigerant from leaking out

2 products

Temperature-Controlled Outlet Adapters

Automatically turn heating and cooling devices on and off as temperatures rise and fall

3 products

Chimney Vent Caps

Cover chimneys to reduce downdrafts and block out debris

12 products

Sealing

Drum Plug Gaskets

Form a tighter seal in drum openings than with a drum plug alone

7 products

Drum Gaskets

Seal lids onto steel and stainless steel drums

6 products