4-40 Feet | McMaster-Carr

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17 Products

Load-Rated Reinforced Threaded-Stud Bumpers

Style 1

Tested to support the load of your application. These bumpers support a wide range of equipment—from a 50 lb. saw to a 5,000 lb. air compressor. They also help reduce vibration and protect whatever they’re mounted to. 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.

Abrasion-Resistant Polyurethane Rubber with Steel Stud and Base Plate

Style 1

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.

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.	OD	Ht.	Max. Load, lb.	Deflection @ Cap.	Hardness	Hardness Rating	Color	Temp., ° F	Nonmarking	For Use Outdoors		Each
Style 1



		4-40	7/32"	9/32"	5/16"	4	Not Rated	Durometer 48A	Medium	Black	60 to 160	No	No	93115K71	00000

Rubber Blend with Steel Stud and Base Plate

Style 1

A good choice for outdoor use, these withstand sunlight, rain, and ozone better than Buna-N bumpers.

	Thread
	Size	Lg.	OD	Ht.	Max. Load, lb.	Deflection @ Cap.	Hardness	Hardness Rating	Color	Temp., ° F	Nonmarking	For Use Outdoors		Each
Style 1



		4-40	7/32"	9/32"	5/16"	0.5	Not Rated	Durometer 19A	Soft	Black	-10 to 150	No	Yes	93115K95	00000

Load-Rated Reinforced Threaded-Hole Bumpers

Style 1

Tested to ensure they’ll bear the weight of your application, these bumpers support everything from a 50-pound saw to a 2,000-pound air compressor. They also help reduce vibration and protect whatever they're mounted to. All have a metal base plate for added strength and a longer 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.

Abrasion-Resistant Polyurethane Rubber with Steel Base Plate

Style 1

	Thread
	Size	Dp.	OD	Ht.	Max. Load, lb.	Deflection @ Cap.	Hardness	Hardness Rating	Color	Temp., ° F	Nonmarking	For Use Outdoors		Each
Style 1



		4-40	1/8"	9/32"	5/16"	2	Not Rated	Durometer 48A	Medium	Black	60 to 100	No	No	93115K81	00000

Rubber Blend with Steel Base Plate

Style 1

A good choice for outdoor use, these withstand sunlight, rain, and ozone better than Buna-N bumpers.

	Thread
	Size	Dp.	OD	Ht.	Max. Load, lb.	Deflection @ Cap.	Hardness	Hardness Rating	Color	Temp., ° F	Nonmarking	For Use Outdoors		Each
Style 1



		4-40	1/8"	9/32"	5/16"	0.3	Not Rated	Durometer 19A	Soft	Black	-10 to 150	Yes	Yes	93115K92	00000

Vibration-Damping Sandwich Mounts with Stud and Insert

Install 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. They also muffle noise so you can work or hold a conversation around buzzing and thumping machinery.

Chemical-Resistant Polyurethane Rubber About Chemical-Resistant Polyurethane Rubber

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

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

								Thread						Each
	Thread Size	Cap. per Mount, lb.	Deflection @ Cap.	Shear Cap. per Mount, lb.	Deflection @ Shear Cap.	Ht.	Dia.	Lg.	Dp.	Hardness	Temp. Range, ° F	Color		1-24	25-99	100-Up
Zinc-Plated Steel Stud and Steel Insert



		4-40	2	0.02"	0.8	0.08"	5/16"	5/16"	3/16"	1/8"	Durometer 58A	0 to 140	Black	96905K35	00000	00000	00000

Vibration-Damping Sandwich Mounts with Studs

Install 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. They also muffle noise so you can work or hold a conversation around buzzing and thumping machinery.

Chemical-Resistant Polyurethane Rubber About Chemical-Resistant Polyurethane Rubber

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

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

													Each
	Thread Size	Cap. per Mount, lb.	Deflection @ Cap.	Shear Cap. per Mount, lb.	Deflection @ Shear Cap.	Ht.	Dia.	Thread Lg.	Hardness	Temp. Range, ° F	Color		1-24	25-99	100-Up
Zinc-Plated Steel Stud



		4-40	4	0.04"	1.5	0.15"	5/16"	5/16"	3/16"	Durometer 58A	0 to 140	Black	96905K31	00000	00000	00000

Threaded-Stud Bumpers


Style 1	Style 2

These bumpers absorb impact to protect equipment, walls, and floors from dents and scuffs. They're found everywhere from access panels to the bases of equipment. The rubber construction also stifles noise and absorbs vibration to prevent wear and tear to your machinery and nearby surfaces. No separate fasteners are needed—just twist them into a threaded hole.

Multipurpose SBR Rubber About Multipurpose SBR Rubber


Style 1	Style 2

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	Lg.	OD	Ht.	Counterbore Dia.	Hardness	Hardness Rating	Color	Temp., ° F	Stud Material	Nonmarking	For Use Outdoors	Pkg. Qty.		Pkg.
Style 1



		4-40	1/4"	1/4"	1/4"	—	Durometer 40A	Medium Soft	Black	-20 to 180	Steel	No	No	10	8687N21	00000


		4-40	1/4"	1/4"	1/4"	—	Durometer 70A	Hard	Black	-20 to 180	Steel	No	No	10	8687N19	0000


		Style 2



				4-40	3/8"	1/2"	1/4"	17/64"	Durometer 70A	Hard	Black	0 to 180	Steel	No	No	10	8687N41	0000

Dual-Clamping Fixture Clamps

Set one of these clamps between two workpieces in a fixture and tighten the screw to push the clamp's sides out for a secure hold. The minimal contact leaves more of the workpieces free for machining.

				Thread		Drive					Each		Package
Lg.	Wd.	Ht.	Max. Clamping Force, lbf	Size	Lg.	Size	Style	Material	Screw Material	Wedge Material		Each	Pkg. Qty.		Pkg.



	15/32"	3/8"	3/8"	300	4-40	1/2"	3/32"	Hex	Aluminum	Steel	Steel	8693A16	000000	6	8693A66	000000

Low-Profile Fixture Clamps

Blunt Edge

Knife Edge

Install these clamps into a slot in your fixture to grip at the bottom of workpiece edges, giving the cutting tool maximum access to your workpiece. Thread the clamp into a tapped hole and give the center screw a half turn for quick clamping.

Blunt Edge—Clamps with a blunt edge are less likely to mar your workpiece.

Knife Edge—Clamps with a knife edge bite into your workpiece for faster and more aggressive machining.

Brass Head—Clamps with brass heads are nonmarring when used with steel and aluminum workpieces.

	Head								Thread		Drive			Each		Package
	Lg.	Wd.	Ht.	Max. Movement	Material	Max. Clamping Force, lbf	Min. Workpiece Contact	For Slot Dp.	Size	Lg.	Size	Style	Screw Material		Each	Pkg. Qty.		Pkg.
Blunt Edge



		3/8"	3/8"	7/32"	0.008"	Brass	200	0.075"	0.14"	4-40	7/32"	1/16"	Hex	Steel	2172A59	000000	8	2172A51	000000


		3/8"	3/8"	7/32"	0.008"	Steel	650	0.075"	0.14"	4-40	1/4"	3/32"	Hex	Steel	2172A13	00000	8	2172A33	00000


		Knife Edge



				3/8"	3/8"	7/32"	0.008"	Steel	650	0.075"	0.14"	4-40	1/4"	3/32"	Hex	Steel	2172A12	00000	8	2172A32	00000