M4 Bumpers | McMaster-Carr

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53 Products

Load-Rated Reinforced Threaded-Stud Bumpers

Style 1

These bumpers are tested to ensure they'll support the load of your application. They'll bear the weight of everything from a 50-pound saw to a 5,000-pound air compressor. All have a metal base plate for added strength and a longer service life than all-rubber bumpers. No separate fasteners are needed—just twist them into a threaded hole.

Style 1

Natural Rubber—These bumpers absorb impact well enough for most applications. However, they're not for use outdoors and break down when exposed to oil and harsh chemicals.

Stainless Steel Stud—Unlike bumpers with steel studs, these handle repeated washdowns without corroding.

Steel Stud—Durable and economical, these are the choice for most jobs.

Hardness Rating—The harder the bumper, the better it withstands impact and abrasion over time. The softer the bumper, the more cushioning it provides for objects made of glass, soft metal, and other fragile materials. Bumpers with a medium rating offer a balance of impact resistance and cushioning.

	Thread
	Size	Lg., mm	OD, mm	Ht., mm	Max. Load, lb.	Hardness	Hardness Rating	Color	Temp., ° F	Nonmarking	For Use Outdoors		Each
Natural Rubber with Steel Stud and Base Plate


		M4 × 0.7 mm	10	10	10	20	Durometer 55A	Medium	Black	-40 to 170	No	No	00000000	00000
		M4 × 0.7 mm	10	10	10	45	Durometer 70A	Hard	Black	-40 to 170	No	No	00000000	0000
		M4 × 0.7 mm	10	10	15	21	Durometer 55A	Medium	Black	-40 to 170	No	No	00000000	0000
		M4 × 0.7 mm	10	10	15	35	Durometer 70A	Hard	Black	-40 to 170	No	No	00000000	0000
		M4 × 0.7 mm	10	10	20	21	Durometer 55A	Medium	Black	-40 to 170	No	No	00000000	0000
		M4 × 0.7 mm	10	10	20	35	Durometer 70A	Hard	Black	-40 to 170	No	No	00000000	0000
		M4 × 0.7 mm	10	15	10	35	Durometer 55A	Medium	Black	-40 to 170	No	No	0000000	0000
		M4 × 0.7 mm	10	15	10	90	Durometer 70A	Hard	Black	-40 to 170	No	No	00000000	0000
		M4 × 0.7 mm	10	15	15	50	Durometer 50A	Medium	Black	-10 to 150	No	No	000000000	0000
		M4 × 0.7 mm	10	15	15	80	Durometer 70A	Hard	Black	-40 to 170	No	No	00000000	0000
		M4 × 0.7 mm	10	15	20	60	Durometer 50A	Medium	Black	-10 to 150	No	No	000000000	0000
		M4 × 0.7 mm	10	15	20	130	Durometer 70A	Hard	Black	-40 to 170	No	No	00000000	0000
		M4 × 0.7 mm	10	15	30	50	Durometer 55A	Medium	Black	-40 to 170	No	No	00000000	0000
		M4 × 0.7 mm	10	15	30	80	Durometer 70A	Hard	Black	-40 to 170	No	No	00000000	0000

		Natural Rubber with Corrosion-Resistant Stainless Steel Stud and Base Plate


				M4 × 0.7 mm	10	10	10	20	Durometer 55A	Medium	Black	-40 to 170	No	No	00000000	0000
				M4 × 0.7 mm	10	10	15	21	Durometer 55A	Medium	Black	-40 to 170	No	No	00000000	0000
				M4 × 0.7 mm	10	15	10	35	Durometer 55A	Medium	Black	-40 to 170	No	No	00000000	0000
				M4 × 0.7 mm	10	15	15	50	Durometer 50A	Medium	Black	-10 to 150	No	No	000000000	0000
				M4 × 0.7 mm	10	15	20	60	Durometer 50A	Medium	Black	-10 to 150	No	No	000000000	0000
				M4 × 0.7 mm	10	15	30	50	Durometer 55A	Medium	Black	-40 to 170	No	No	00000000	0000

Load-Rated Reinforced Threaded-Hole Bumpers


Style 1	Style 3

These bumpers are tested to ensure they'll support the load of your application. They'll bear the weight of everything from a 50-pound saw to a 2,000-pound air compressor. All have a metal base plate for added strength and a longer service life than all-rubber bumpers. Twist them onto a threaded stud on your equipment, or pair them with your own stud to create a custom-length bumper.

Style 1

Natural Rubber—These bumpers absorb impact well enough for most applications. However, they're not for use outdoors and break down when exposed to oil and harsh chemicals.

	Thread
	Size	Dp., mm	OD, mm	Ht., mm	Max. Load, lb.	Hardness	Hardness Rating	Color	Temp., ° F	Nonmarking	For Use Outdoors		Each
Natural Rubber with Steel Base Plate


		M4 × 0.7 mm	4	10	10	11	Durometer 40A	Medium Soft	Black	-40 to 170	Yes	No	00000000	00000
		M4 × 0.7 mm	4	10	10	13	Durometer 55A	Medium	Black	-20 to 150	Yes	No	000000000	0000
		M4 × 0.7 mm	4	10	10	45	Durometer 70A	Hard	Black	-40 to 170	Yes	No	00000000	0000
		M4 × 0.7 mm	4	10	15	15	Durometer 40A	Medium Soft	Black	-40 to 170	Yes	No	00000000	0000
		M4 × 0.7 mm	4	10	15	35	Durometer 70A	Hard	Black	-40 to 170	Yes	No	00000000	0000
		M4 × 0.7 mm	4	15	15	30	Durometer 40A	Medium Soft	Black	-40 to 170	Yes	No	00000000	0000
		M4 × 0.7 mm	4	15	15	50	Durometer 55A	Medium	Black	-20 to 150	Yes	No	000000000	0000
		M4 × 0.7 mm	4	15	15	85	Durometer 70A	Hard	Black	-40 to 170	Yes	No	00000000	0000
		M4 × 0.7 mm	4	15	20	30	Durometer 40A	Medium Soft	Black	-40 to 170	Yes	No	00000000	0000
		M4 × 0.7 mm	4	15	20	60	Durometer 55A	Medium	Black	-20 to 150	Yes	No	000000000	0000
		M4 × 0.7 mm	4	15	20	130	Durometer 70A	Hard	Black	-40 to 170	Yes	No	00000000	0000

		Natural Rubber with Corrosion-Resistant Stainless Steel Base Plate


				M4 × 0.7 mm	4	10	10	13	Durometer 55A	Medium	Black	-20 to 150	Yes	No	000000000	0000
				M4 × 0.7 mm	4	15	15	50	Durometer 55A	Medium	Black	-20 to 150	Yes	No	000000000	0000
				M4 × 0.7 mm	4	15	20	60	Durometer 55A	Medium	Black	-20 to 150	Yes	No	000000000	0000

Style 3

Abrasion-Resistant Polyurethane Rubber—Our toughest rubber bumpers, they keep their shape even when knocked and scraped by metal and other abrasive materials. They're often used on industrial vehicles, conveyors, and heavy construction equipment.

	Thread
	Size	Dp., mm	OD, mm	Ht., mm	Max. Load, lb.	Hardness	Hardness Rating	Color	Temp., ° F	Nonmarking	For Use Outdoors		Each
Abrasion-Resistant Polyurethane Rubber with Steel Base Plate


		M4 × 0.7 mm	6	19	13	3	Durometer 50 OO	Extra Soft	Black	-20 to 160	No	No	0000000	000000
		M4 × 0.7 mm	6	19	13	6	Durometer 70 OO	Soft	Black	-20 to 160	No	No	0000000	00000

Vibration-Damping Sandwich Mounts with Studs

Wedge these mounts between two holes inside or under equipment. Our jack-of-all-trades option, they isolate vibration to protect circuit boards, air compressors, and everything in between. The mounts also muffle noise so you can work or hold a conversation around buzzing and thumping machinery.

Multipurpose Neoprene

Image of Product. Front orientation. Vibration-Damping Mounts. Vibration-Damping Sandwich Mounts with Studs.

Resist wear and tear well enough for most applications. They won't break down when exposed to oil, grease, and gasoline, so they're a good choice for motors and pumps.

Zinc-Plated Steel Stud—An economical choice for equipment not facing moisture or harsh chemicals.

	Cap. per Mount, lb.	Deflection @ Cap.	Shear Cap. per Mount, lb.	Deflection @ Shear Cap.	Ht.	Dia.	Thread Lg.	Temp. Range, ° F	Color		Each
Zinc-Plated Steel Stud


	M4 × 0.7 mm	7	0.05"	0.75	0.04"	1/2"	3/8"	1/2"	10 to 180	Black	0000000	00000
	M4 × 0.7 mm	20	0.05"	3	0.06"	1/2"	5/8"	1/2"	10 to 180	Black	0000000	0000

Natural Rubber

These mounts don’t scuff or tear easily, and they stay strong and flexible at subfreezing temperatures.

Zinc-Plated Steel Stud—An economical choice for equipment not facing moisture or harsh chemicals.

Corrosion-Resistant 304 Stainless Steel Stud—Last longer than steel when exposed to water and mild chemicals, such as weak acids used in food production and the acetone found in degreasers.

	Cap. per Mount, lb.	Deflection @ Cap.	Shear Cap. per Mount, lb.	Deflection @ Shear Cap.	Ht.	Dia.	Thread Lg.	Temp. Range, ° F	Color		Each
Zinc-Plated Steel Stud


	M4 × 0.7 mm	7	0.05"	0.75	0.04"	1/2"	3/8"	1/2"	-10 to 150	Black	0000000	00000
	M4 × 0.7 mm	20	0.05"	3	0.06"	1/2"	5/8"	1/2"	-10 to 150	Black	0000000	0000

	Corrosion-Resistant 304 Stainless Steel Stud


			M4 × 0.7 mm	44	0.06"	4	0.06"	3/8"	5/8"	3/8"	-10 to 150	Black	0000000	00000

Vibration-Damping Sandwich Mounts with Stud and Insert

Wedge these mounts between a threaded stud and a hole inside or under equipment. Our jack-of-all-trades option, they isolate vibration to protect circuit boards, air compressors, and everything in between. The mounts also muffle noise so you can work or hold a conversation around buzzing and thumping machinery.

Multipurpose Neoprene

Image of Product. Front orientation. Vibration-Damping Mounts. Vibration-Damping Sandwich Mounts with Stud and Insert.

Resist wear and tear well enough for most applications. They won't break down when exposed to oil, grease, and gasoline, so they're a good choice for motors and pumps.

Zinc-Plated Steel Stud and Steel Insert—An economical choice for equipment not facing moisture or harsh chemicals.

								Thread
	Thread Size	Cap. per Mount, lb.	Deflection @ Cap.	Shear Cap. per Mount, lb.	Deflection @ Shear Cap.	Ht.	Dia.	Lg.	Dp.	Temp. Range, ° F	Color		Each
Zinc-Plated Steel Stud and Steel Insert


		M4 × 0.7 mm	7	0.05"	0.75	0.04"	1/2"	3/8"	1/2"	1/8"	10 to 180	Black	0000000	00000
		M4 × 0.7 mm	20	0.05"	3	0.06"	1/2"	5/8"	1/2"	3/16"	10 to 180	Black	0000000	0000

Natural Rubber

These mounts don’t scuff or tear easily, and they stay strong and flexible at subfreezing temperatures.

Zinc-Plated Steel Stud and Steel Insert—An economical choice for equipment not facing moisture or harsh chemicals.

Corrosion-Resistant 304 Stainless Steel Insert—Last longer than steel when exposed to water and mild chemicals, such as weak acids used in food production and the acetone found in degreasers.

								Thread
	Thread Size	Cap. per Mount, lb.	Deflection @ Cap.	Shear Cap. per Mount, lb.	Deflection @ Shear Cap.	Ht.	Dia.	Lg.	Dp.	Temp. Range, ° F	Color		Each
Zinc-Plated Steel Stud and Steel Insert


		M4 × 0.7 mm	7	0.05"	0.75	0.04"	1/2"	3/8"	1/2"	1/8"	-10 to 150	Black	0000000	00000
		M4 × 0.7 mm	20	0.05"	3	0.06"	1/2"	5/8"	1/2"	3/16"	-10 to 150	Black	0000000	0000

		Corrosion-Resistant 304 Stainless Steel Stud and Insert


				M4 × 0.7 mm	44	0.06"	4	0.08"	3/8"	9/16"	3/8"	5/32"	-10 to 150	Black	00000000	00000

Chemical-Resistant Polyurethane Rubber

Keep their strength and flexibility when exposed to a wide range of coatings, solvents, oils, and cleaners made with mild acids and bases.

Zinc-Plated Steel Stud and Steel Insert—An economical choice for equipment not facing moisture or harsh chemicals.

								Thread
	Thread Size	Cap. per Mount, lb.	Deflection @ Cap.	Shear Cap. per Mount	Deflection @ Shear Cap.	Ht.	Dia.	Lg.	Dp.	Temp. Range, ° F	Color		Each
Zinc-Plated Steel Stud and Steel Insert


		M4 × 0.7 mm	6	0.1"	Not Rated	Not Rated	1/2"	3/4"	1/2"	1/4"	-20 to 160	Black	00000000	000000
		M4 × 0.7 mm	12	0.1"	Not Rated	Not Rated	1/2"	3/4"	1/2"	1/4"	-20 to 160	Black	00000000	00000

Vibration-Damping Sandwich Mounts with Inserts

Wedge these mounts between studs inside or under equipment. Our jack-of-all-trades option, they isolate vibration to protect circuit boards, air compressors, and everything in between. The mounts also muffle noise so you can work or hold a conversation around buzzing and thumping machinery. With reinforcing metal bonded to the rubber, they'll support weight whether mounted underneath equipment (Cap. per Mount) or side mounted (Shear Cap. per Mount).

Multipurpose Neoprene

Image of Product. Bottom orientation. Vibration-Damping Mounts. Vibration-Damping Sandwich Mounts with Inserts.

Resist wear and tear well enough for most applications. They won't break down when exposed to oil, grease, and gasoline, so they're a good choice for motors and pumps.

Steel-Insert—An economical choice for equipment not facing moisture or harsh chemicals.

	Cap. per Mount, lb.	Deflection @ Cap.	Shear Cap. per Mount, lb.	Deflection @ Shear Cap.	Ht.	Dia.	Thread Dp.	Temp. Range, ° F	Color		Each
Steel-Insert


	M4 × 0.7 mm	7	0.05"	0.75	0.04"	1/2"	3/8"	1/8"	10 to 180	Black	0000000	00000
	M4 × 0.7 mm	25	0.03"	5	0.03"	1/2"	5/8"	3/16"	10 to 180	Black	0000000	0000

Natural Rubber

These mounts don’t scuff or tear easily, and they stay strong and flexible at subfreezing temperatures.

Steel-Insert—An economical choice for equipment not facing moisture or harsh chemicals.

Corrosion-Resistant 304 Stainless Steel-Insert—Last longer than steel when exposed to water and mild chemicals, such as weak acids used in food production and the acetone found in degreasers.

	Cap. per Mount, lb.	Deflection @ Cap.	Shear Cap. per Mount, lb.	Deflection @ Shear Cap.	Ht.	Dia.	Thread Dp.	Temp. Range, ° F	Color		Each
Steel-Insert


	M4 × 0.7 mm	7	0.05"	0.75	0.04"	1/2"	3/8"	1/8"	-10 to 150	Black	0000000	00000
	M4 × 0.7 mm	25	0.03"	5	0.03"	1/2"	5/8"	3/16"	-10 to 150	Black	0000000	0000

	Corrosion-Resistant 304 Stainless Steel-Insert


			M4 × 0.7 mm	30	0.1"	4	0.08"	1/2"	5/8"	5/32"	-10 to 150	Black	00000000	00000