8-32 Plungers | McMaster-Carr

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64 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.

316 Stainless Steel Nose—With the best corrosion resistance of all, 316 stainless steel stands up to harsh weather, salt water, and chemicals. The nose is strong enough for most jobs, but won't withstand stress and vibration as well as steel.

Brass Nose—Similar to 18-8 stainless steel, brass is corrosion resistant enough to stand up to wet environments. Since brass is softer than other metals, these noses are less likely to dent surfaces, however, they could deform under high stress.

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.

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



		8-32	0.025"	0.094"	0.5	1.3	18-8 Stainless Steel	0.34"	Spring Plunger Driver	Slotted	3408A91	00000	3382A12	00000


		8-32	0.025"	0.094"	0.5	1.3	18-8 Stainless Steel	0.45"	Spring Plunger Driver	Hex	5901A32	0000	3382A12	0000
		8-32	0.025"	0.094"	0.5	1.3	Black-Oxide Steel	0.34"	Spring Plunger Driver	Slotted	3408A68	0000	3382A12	0000
		8-32	0.025"	0.094"	0.5	1.3	Black-Oxide Steel	0.45"	Spring Plunger Driver	Hex	5901A12	0000	3382A12	0000


		316 Stainless Steel Nose



				8-32	0.025"	0.094"	0.5	1.3	316 Stainless Steel	0.34"	Spring Plunger Driver	Slotted	8686A14	00000	3382A12	0000


				Brass Nose



						8-32	0.025"	0.094"	0.5	1.3	Brass	0.34"	Spring Plunger Driver	Slotted	8687A14	0000	3382A12	0000


						Nylon Nose



								8-32	0.025"	0.094"	0.5	1.3	18-8 Stainless Steel	0.34"	Spring Plunger Driver	Slotted	34085A5	0000	3382A12	0000


								8-32	0.025"	0.094"	0.5	1.3	Steel	0.34"	Spring Plunger Driver	Slotted	84805A54	0000	3382A12	0000

Spring Plunger Drivers

Install spring plungers from the nose end without depressing the nose.

	For Spring Plunger Nose Type		Each
Steel



	8-32, M4	Ball, Long	3382A12	00000

Long-Nose Spring Plungers

Lock heavy moving parts securely in place. Often used in indexing applications, these have a longer nose than ball-nose spring plungers to withstand greater side forces without disengaging. The nose compresses when a part presses against it, and then pops out into deep notches or grooves for a strong hold.

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.

Steel Nose—The strongest, most wear-resistant noses, these won't deform from stress and vibration. Steel is best for dry environments, however, since moisture will cause it to rust.

18-8 Stainless Steel Nose—The choice for wet and outdoor environments, 18-8 stainless steel resists rusting. It's strong enough for most jobs, but won't withstand stress and vibration as well as steel.

Acetal Nose—The best plastic for damp and wet environments, acetal won't swell or lose strength if exposed to moisture. These noses are extra soft to avoid scratching delicate surfaces. They are best for use on soft materials, such as aluminum.

	Spring Plungers											Spring Plunger Drivers
		Nose		Nose Force, lbf		Body		Drive Style
	Thread Size	Extended Lg.	Dia.	Extended	Compressed	Material	Lg.	Front	Back		Each		Each
Steel Nose



		8-32	0.052"	0.07"	0.5	1.5	Zinc-Plated Steel	0.44"	Spring Plunger Driver	Slotted	3126A76	00000	3382A12	00000


		8-32	0.052"	0.07"	1.5	4.8	Zinc-Plated Steel	0.44"	Spring Plunger Driver	Slotted	3126A77	0000	3382A12	0000
		8-32	0.093"	0.07"	1	3.3	Black-Oxide Steel	0.44"	Spring Plunger Driver	Slotted	3126A211	0000	3382A12	0000
		8-32	0.094"	0.07"	0.5	2	Black-Oxide Steel	0.5"	Spring Plunger Driver	Slotted	3126A78	0000	3382A12	0000
		8-32	0.094"	0.07"	0.5	4	Black-Oxide Steel	0.5"	Spring Plunger Driver	Slotted	3126A79	0000	3382A12	0000
		8-32	0.094"	0.07"	0.7	2.3	Black-Oxide Steel	0.63"	—	Hex	8495A21	0000	———	0
		8-32	0.094"	0.07"	0.7	2.3	Black-Oxide Steel	0.63"	Spring Plunger Driver	—	3126A4	0000	3382A12	0000
		8-32	0.094"	0.07"	2.7	7.3	Black-Oxide Steel	0.63"	—	Hex	8495A13	0000	———	0
		8-32	0.094"	0.07"	2.7	7.3	Black-Oxide Steel	0.63"	Spring Plunger Driver	—	3126A5	0000	3382A12	0000


		18-8 Stainless Steel Nose



				8-32	0.052"	0.07"	0.5	1.5	18-8 Stainless Steel	0.44"	Spring Plunger Driver	Slotted	84985A41	0000	3382A12	0000


				8-32	0.052"	0.07"	0.5	1.5	Zinc-Plated Steel	0.44"	Spring Plunger Driver	Slotted	8490A97	0000	3382A12	0000
				8-32	0.052"	0.07"	1.5	4.8	18-8 Stainless Steel	0.44"	Spring Plunger Driver	Slotted	84985A43	0000	3382A12	0000
				8-32	0.052"	0.07"	1.5	4.8	Zinc-Plated Steel	0.44"	Spring Plunger Driver	Slotted	8490A79	0000	3382A12	0000
				8-32	0.093"	0.07"	1	3.3	18-8 Stainless Steel	0.44"	Spring Plunger Driver	Slotted	84985A11	0000	3382A12	0000
				8-32	0.094"	0.07"	0.7	2.3	18-8 Stainless Steel	0.63"	—	Hex	8476A42	0000	———	0
				8-32	0.094"	0.07"	0.7	2.3	18-8 Stainless Steel	0.63"	Spring Plunger Driver	—	84975A42	0000	3382A12	0000
				8-32	0.094"	0.07"	0.7	2.3	Black-Oxide Steel	0.63"	Spring Plunger Driver	—	8490A69	0000	3382A12	0000
				8-32	0.094"	0.07"	2.7	7.3	18-8 Stainless Steel	0.63"	—	Hex	8476A34	0000	———	0
				8-32	0.094"	0.07"	2.7	7.3	18-8 Stainless Steel	0.63"	Spring Plunger Driver	—	84975A44	0000	3382A12	0000
				8-32	0.094"	0.07"	2.7	7.3	Black-Oxide Steel	0.63"	Spring Plunger Driver	—	8490A56	0000	3382A12	0000


				316 Stainless Steel Nose



						8-32	0.052"	0.07"	1.5	4.7	316 Stainless Steel	0.44"	Spring Plunger Driver	Slotted	8688A31	00000	3382A12	0000


						8-32	0.094"	0.07"	0.5	2	316 Stainless Steel	0.5"	Spring Plunger Driver	Slotted	8688A32	00000	3382A12	0000
						8-32	0.094"	0.07"	0.7	2.3	316 Stainless Steel	0.63"	Spring Plunger Driver	Hex	8688A12	00000	3382A12	0000
						8-32	0.094"	0.07"	2.7	7.3	316 Stainless Steel	0.63"	Spring Plunger Driver	Hex	8688A13	00000	3382A12	0000


						Brass Nose



								8-32	0.052"	0.07"	1.5	4.7	Brass	0.44"	Spring Plunger Driver	Slotted	8689A31	00000	3382A12	0000


								8-32	0.094"	0.07"	0.5	2	Brass	0.5"	Spring Plunger Driver	Slotted	8689A32	00000	3382A12	0000
								8-32	0.094"	0.07"	0.7	2.3	Brass	0.63"	Spring Plunger Driver	Hex	8689A12	00000	3382A12	0000
								8-32	0.094"	0.07"	2.7	7.3	Brass	0.63"	Spring Plunger Driver	Hex	8689A13	00000	3382A12	0000


								Acetal Nose



										8-32	0.052"	0.07"	0.5	1.5	18-8 Stainless Steel	0.44"	Spring Plunger Driver	Slotted	84765A11	0000	3382A12	0000


8-32	0.052"									0.07"	0.5	1.5	Zinc-Plated Steel	0.44"	Spring Plunger Driver	Slotted	8499A28	0000	3382A12	0000
8-32	0.052"									0.07"	1.5	4.8	18-8 Stainless Steel	0.44"	Spring Plunger Driver	Slotted	84765A14	0000	3382A12	0000
8-32	0.052"									0.07"	1.5	4.8	Zinc-Plated Steel	0.44"	Spring Plunger Driver	Slotted	8499A29	0000	3382A12	0000
8-32	0.093"									0.07"	1	3.3	18-8 Stainless Steel	0.44"	Spring Plunger Driver	Slotted	84765A311	0000	3382A12	0000
8-32	0.093"									0.07"	1	3.3	Black-Oxide Steel	0.44"	Spring Plunger Driver	Slotted	8499A811	0000	3382A12	0000
8-32	0.094"									0.07"	0.5	2	Black-Oxide Steel	0.5"	Spring Plunger Driver	Slotted	8499A49	0000	3382A12	0000
8-32	0.094"									0.07"	0.5	4	Black-Oxide Steel	0.5"	Spring Plunger Driver	Slotted	8499A51	0000	3382A12	0000
8-32	0.094"									0.07"	0.7	2.3	18-8 Stainless Steel	0.63"	—	Hex	2177A43	00000	———	0
8-32	0.094"									0.07"	0.7	2.3	18-8 Stainless Steel	0.63"	Spring Plunger Driver	—	84765A71	0000	3382A12	0000
8-32	0.094"									0.07"	0.7	2.3	Black-Oxide Steel	0.63"	—	Hex	2467A13	0000	———	0


8-32	0.094"									0.07"	0.7	2.3	Black-Oxide Steel	0.63"	Spring Plunger Driver	—	8499A11	0000	3382A12	0000
8-32	0.094"									0.07"	2.7	7.3	18-8 Stainless Steel	0.63"	—	Hex	2177A44	00000	———	0
8-32	0.094"									0.07"	2.7	7.3	18-8 Stainless Steel	0.63"	Spring Plunger Driver	—	84765A61	0000	3382A12	0000
8-32	0.094"	0.07"								2.7	7.3	Black-Oxide Steel	0.63"	—	Hex	2467A14	0000	———	0
8-32	0.094"	0.07"	2.7							7.3	Black-Oxide Steel	0.63"	Spring Plunger Driver	—	8499A12	0000	3382A12	0000

Spring Plunger Mounts


Style A	Style A

Mount ball-nose and long-nose spring plungers to fixture surfaces. Insert the plunger into the threaded hole. They're good for horizontal applications. Fasteners are not included.

Steel—Steel mounts are strong and wear resistant.

18-8 Stainless Steel—18-8 stainless steel mounts are chemical resistant and may be mildly magnetic.

					Mounting Holes		Steel		18-8 Stainless Steel
	Thread Size	Lg.	Wd.	Ht.	Dia.	Ctr.-to-Ctr.		Each		Each
Style A



		8-32	1/2"	11/16"	1/4"	0.125"	0.484"	8685A14	000000	1942A41	000000

Toggle Clamp Holding Screws


With Rubber Rigid Flat Tip	With Steel Rigid Flat Tip

Replace worn screws or customize your clamps.

	Holding Screw				Steel Clamp Holding Screws		Stainless Steel Clamp Holding Screws
	Thread Size	Thread Lg.	Tip Dia.	Overall Lg.		Each		Each
With Rubber Rigid Flat Tip



		8-32	3/4"	9/16"	1"	5147A56	00000	5147A88	00000


		8-32	1"	9/16"	1 1/4"	5147A57	0000	———	0


		With Steel Rigid Flat Tip



				8-32	1"	1/4"	1 3/32"	5147A97	0000	———	0

Compact Push/Pull Toggle Clamps


Internal Plunger Thread—Steel	Internal Plunger Thread—18-8 Stainless Steel

Smaller than standard push/pull toggle clamps, these are often used for electronics and small fixturing applications. A pushing or pulling motion holds workpieces from the side. Clamps secure in two positions—when the plunger is fully extended and when the plunger is fully retracted.

Internal Plunger Thread—Clamps with internally threaded plunger accommodate threaded holding screws and other threaded fixtures (not included).

18-8 Stainless Steel Body—Stainless steel clamps have good corrosion resistance.

		Plunger						When Clamped
	Holding Cap., lb.	Lg.	Ht.	Travel	Dia.	Thread Size	Thread Lg.	Overall Ht.	Overall Lg.		Each
Internal Plunger Thread—Steel



		100	1 1/4"	1/2"	5/8"	1/4"	8-32	1/2"	1 1/4"	2 5/8"	5093A55	000000


		150	1 1/8"	1/2"	5/8"	1/4"	8-32	1/2"	1 1/4"	2 5/8"	5093A19	00000


		Internal Plunger Thread—18-8 Stainless Steel



				100	1 1/4"	1/2"	5/8"	1/4"	8-32	1/2"	1 1/4"	2 5/8"	5093A68	00000


				150	1 1/8"	1/2"	5/8"	1/4"	8-32	1/2"	1 1/4"	2 5/8"	5093A33	00000

Create-Your-Own Spring Locating Pins

Thread in a screw, handle, or other part to create the right size and shape guide pin for your application. As the workpiece pushes against the pin head in one direction, the internal spring pushes back to hold it in place for clamping. Press into a drilled hole using the installation tool (sold separately).

	Body
Thread Size	Dia.	Lg.	Min. Spring Force	Max. Spring Force, lbf	Body Dia. Tolerance	Body Material		Each



	8-32	0.44"	0.43"	Not Rated	4.5	-0.002" to 0.002"	Aluminum	3076N11	00000