M3 Plungers | McMaster-Carr

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10 Products

Ball-Nose Spring Plungers

Align, position, and lock moving parts for most machining and assembly tasks. These spring plungers have a spring-loaded ball that compresses when a part presses against it, and then pops out into a notch or groove to hold the part in place. Unlike long-nose spring plungers, the ball rolls easily in and out of position, so they're a great fit for applications that require consistent, smooth movement, such as positioning parts in an assembly line and aligning fixtures and jigs when cutting or drilling.

Spring plungers are available with or without a threadlocker. Those with a threadlocker won't wiggle loose from vibration. Spring plungers without a threadlocker are easier to remove.

440C Stainless Steel Nose—The strongest, most wear-resistant stainless steel noses, these grind against hard metal surfaces without denting or scratching. However, they are not as corrosion resistant as 316 stainless steel.

Nylon Nose—Extra soft to avoid scratching delicate surfaces. Nylon is best for use on soft materials, such as aluminum. It will swell and weaken when exposed to moisture, however, so it should only be used in dry environments.

		Nose, mm		Nose Force, lbf		Body		Drive Style
	Thread Size	Extended Lg.	Dia.	Extended	Compressed	Material	Lg., mm	Front	Back		Each
440C Stainless Steel Nose



		M3 x 0.5 mm	0.4	1.5	0.7	1	18-8 Stainless Steel	7	Spring Plunger Driver	Slotted	00000000	000000


		M3 x 0.5 mm	0.4	1.5	0.7	1	Steel	7	Spring Plunger Driver	Slotted	0000000	0000


		Nylon Nose



				M3 x 0.5 mm	0.4	1.5	0.7	1	18-8 Stainless Steel	7	Spring Plunger Driver	Slotted	0000000	0000


				M3 x 0.5 mm	0.4	1.5	0.7	1	Steel	7	Spring Plunger Driver	Slotted	0000000	0000

Vacuum Cups


Male	Male

Use cups with a vacuum system to grip, lift, and move flat materials, such as sheet metal and plastic. Cups with diameters larger than 5 _1/2" have threaded mounting holes in addition to the threaded air port.

Warning: Never use to lift people or items over people.

Buna-N Cups—Buna-N cups are abrasion resistant and have better oil resistance than vinyl plastic cups.

	Vacuum Cups												Replacement Vacuum Cups
								Temp., ° F		Male
	Wt. Cap. @ Vacuum	Cup Dia.	Compressed Cup Ht.	Cup Ht.	Thread Size	Thread Type	For Use With	Min.	Max.	Overall Ht.		Each		Each
For Smooth Surfaces







				Buna-N Cups

				0.02 lb. @ 24 in. Hg	0.08"	0.14"	0.16"	M3	Metric	Sheet Metal, Plastic	-30	210	0.35"	00000000	000000	00000000	00000


				0.09 lb. @ 24 in. Hg	0.14"	0.14"	0.16"	M3	Metric	Sheet Metal, Plastic	-30	210	0.35"	00000000	00000	00000000	0000

Quick-Release Pins for Blind Holes

Often used to position and hold parts during assembly and inspection, mate these pins with a receptacle to secure them in blind holes. Install the receptacle (sold separately) in the hole so you can insert the pin to join components. Three retaining balls lock pins in place until released.

Twist Knob

No button to hold down, these pins secure and release with just a quarter turn of the knob.

Nickel-Plated Carbon Steel—With a durable finish, these pins resist rust, salt water, and mild chemicals.

	Quick-Release Pins												Receptacles
	Dia., mm	Usable Lg., mm	For Panel Thk., mm	Mounting Flange Dia., mm	Double Shear Breaking Strength	Min. Hardness	Handle Color	Handle Material	Ball Material	Mounting Fasteners Included		Each		Each
Nickel-Plated Carbon Steel



		10	10.5	6 to 14	34	Not Rated	Not Rated	Black	Plastic	Stainless Steel	Yes	000000000	000000	000000000	000000