Gap Fillers | McMaster-Carr

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Material

Calcium Sulfate (Gypsum)

For Use Outdoors

For Joining

Minimum Temperature

Pressure to Compress 25%

Adhesive Type

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Compliant with Exemptions

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DFARS Specialty Metals

Exempt

Cellular Skin Surface

5,041 Products

Sealing

Sealants

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

263 products

Backer Rods

Insert into gaps before caulking to reduce how much sealant you need and improve adhesion

35 products

Caulk Guns

Cartridge, sausage-pack, and bulk-load caulk guns

40 products

Caulk Gun Nozzles

Attach to caulk guns to change the shape and amount of sealant that's dispensed

12 products

Sealant Primers

Apply to surfaces before sealant to speed up drying times and improve adhesion

9 products

Thread Sealants

Create a seal between threaded connections to prevent loosening from vibration

184 products

Backer Rod Insertion Tools

Quickly set foam backer rods in caulk joints at a consistent depth without puncturing them

2 products

Raw Materials

Foam

Pockets of air make it lighter in weight than rubber; good for packing, insulating, and sealing

2,682 products

Heating, Ventilation, and Air Conditioning

Spray Foam Insulation

Expands to fill in cracks, gaps, and other hollow spaces for a tight seal against drafts and heat

15 products

Insulation Fill

Blow into walls to fill gaps in existing insulation, or mix as a filler in insulating cement

1 product

Thermal Insulation Sheets

Line the walls of furnaces, freezers, ductwork, and buildings to keep heat in or out

251 products

Pipe Insulation

Fit around pipe, tubing, and tanks to reduce heat loss or condensation

109 products

Fastening and Joining

Adhesives

Bond surfaces together

627 products

Retaining Compounds

Fill gaps to bond shafts, bearings, press-fit assemblies, and other cylindrical metal parts

80 products

Adhesive Dispensing Gun Nozzles

Pair with cartridges in dispensing guns to control the flow of adhesive

80 products

Adhesive Dispensing Gun Cartridge Plungers

Pair with syringes or dispensing-gun cartridges to push adhesive out

6 products

Adhesive Dispensing Guns

Apply beads of adhesive from a cartridge to surfaces

49 products

Tape

Bind, seal, and mark surfaces

103 products

Weld-Backing Tape

Stick to the back of welding seams to contain spatter and prevent gases from weakening the weld

11 products

Facility and Grounds Maintenance

Surface Fillers

Repair chips, cracks, and tears in various surfaces

197 products

Paint Primers

Extend the life of paint and coatings by preparing surfaces beforehand

37 products

Protective Coating Primers

Prepare metal surfaces for powder coating

2 products

Hoes

Dig, scrape, and cut vegetation; move and mix materials

6 products

Rakes

Collect leaves and debris; spread landscaping and construction materials

24 products

Stakes

Anchor objects to the ground and mark off areas

8 products

Stake Pullers

Remove stakes from concrete form boards

1 product

Concrete Edgers

Create a rounded, finished-looking edge on poured concrete slabs

1 product

Concrete Groovers

Add grooves to stop concrete slabs from cracking as they dry, settle, or freeze

1 product

Concrete Floats

Smooth the surface of concrete and release trapped air and water

3 products

Concrete Curing Vibrators

Increase the strength of concrete mix by shaking trapped air loose

1 product

Sealant Removers

Clean sealant and caulk off tools and other surfaces

2 products

Brooms

Sweep up dust, dirt, and other debris

1 product

Trowels

Spread and scrape mortar, concrete, drywall, and adhesives

18 products

Masonry Brushes

Sweep away hardened flecks of mortar, dirt, and other debris

1 product

Grout Floats

Smooth and spread grout between tiles

1 product

Brick Jointers

Rub along the mortar between bricks for a uniform, finished appearance

1 product

Seam Rollers

Press down the seams where wall coverings meet for a smooth, continuous appearance

7 products

Drywall Patches

Stick over holes in drywall and cover with drywall compound for quick repairs

3 products

Drywall Tape

Apply to seams and corners before spreading drywall compound for a finished appearance

2 products

Drywall Compound Hawks

Carry drywall compound in one hand so you can apply it with the other

1 product

Drywall Compound Mashers

Mix drywall compound in large containers

1 product

Containers, Storage, and Furniture

Drywall Compound Pans

Mix small batches of drywall compound and bring them to your work area; also known as mud pans

1 product

Tank Patches

Spin with a handheld electric router to seal holes in plastic tanks and containers

2 products

Concrete Mixing Boxes

Mix concrete in seamless boxes that won't crack or leak

2 products

Fabricating and Machining

Drywall Knives

Smoothly spread drywall compounds and also scrape off paint and debris

11 products

Material Handling

Dock Door Seals

Close the gap between dock doors and trailers to keep heated or cooled air in and dust out

3 products

Shipping Box Liners

Line cardboard boxes to keep the items inside at a consistent temperature

13 products

Safety Equipment

Fire Stops

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

52 products