1"-8 Plungers | McMaster-Carr

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23 Products

Ring-Grip Retractable Spring Plungers

Spring Plunger

Loop a lanyard through the ring to secure these spring plungers to machinery and prevent accidental drops. Pull the ring back to manually retract the nose and position, align, and lock components as needed for your job.

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.

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.

Twist-to-Lock—Free up both hands to adjust your workpiece or switch out parts without the plunger springing back and getting in the way. Pull back the handle and twist to lock the nose in its retracted position.

			Nose		Nose Force, lbf		Body		Handle		Nonlocking		Twist-to-Lock
	Thread Size	Thread Lg.	Extended Lg.	Dia.	Extended	Compressed	Material	Lg.	Material	Dia.		Each		Each
Steel Nose



		1"-8	1"	0.63"	0.5"	1.8	7	Zinc-Plated Steel	1.75"	Steel	1 1/8"	8487A77	000000	———	0


		18-8 Stainless Steel Nose



				1"-8	1"	0.63"	0.5"	1.8	7	18-8 Stainless Steel	1.75"	18-8 Stainless Steel	1 1/8"	8500A57	00000	———	0


				316 Stainless Steel Nose



						1"-8	1"	0.63"	0.5"	1.8	7	316 Stainless Steel	1.75"	316 Stainless Steel	1 1/8"	8691A37	00000	8691A45	000000


						1"-8	3.25"	0.9"	0.68"	8	20	316 Stainless Steel	4.63"	316 Stainless Steel	1.4"	8691A53	00000	8691A61	00000


						Brass Nose



								1"-8	1"	0.63"	0.5"	1.8	7	Brass	1.75"	Steel	1 1/8"	8482A36	00000	8482A76	00000


								1"-8	3.25"	0.9"	0.68"	8	20	Brass	4.63"	Steel	1.4"	8482A46	00000	8482A24	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.

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



		1"-8	0.5"	—	0.498"	4	31	Black-Oxide Steel	2.41"	Spring Plunger Driver	—	3126A72	000000	3382A21	000000


		1"-8	0.5"	—	0.498"	16	68	Black-Oxide Steel	2.41"	Spring Plunger Driver	—	3126A73	00000	3382A21	00000
		1"-8	0.5"	0.5"	—	4	31	Black-Oxide Steel	2.41"	External Hex	—	3360A77	00000	———	0
		1"-8	0.5"	0.5"	—	16	68	Black-Oxide Steel	2.41"	External Hex	—	3360A51	00000	———	0


		18-8 Stainless Steel Nose



				1"-8	0.5"	—	0.498"	4	31	18-8 Stainless Steel	2.41"	Spring Plunger Driver	—	84975A79	00000	3382A21	00000


				1"-8	0.5"	—	0.498"	4	31	Black-Oxide Steel	2.41"	Spring Plunger Driver	—	8490A78	00000	3382A21	00000
				1"-8	0.5"	—	0.498"	16	68	18-8 Stainless Steel	2.41"	Spring Plunger Driver	—	84975A83	00000	3382A21	00000
				1"-8	0.5"	—	0.498"	16	68	Black-Oxide Steel	2.41"	Spring Plunger Driver	—	8490A67	00000	3382A21	00000


				316 Stainless Steel Nose



						1"-8	0.5"	—	0.498"	16	68	316 Stainless Steel	2.41"	Spring Plunger Driver	Hex	8688A24	00000	3382A21	00000


						Brass Nose



								1"-8	0.5"	—	0.498"	16	68	Brass	2.41"	Spring Plunger Driver	Hex	8689A24	00000	3382A21	00000

Long-Nose Spring Plungers For Ejecting

Punch large parts free from presses or dies with a nose that’s three times longer than others. These spring plungers also have a long spring that doesn’t need to compress as far to retract the nose, so it can handle high speed, repetitive ejecting jobs without wearing down.

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.

		Nose		Nose Force, lbf		Body
	Thread Size	Extended Lg.	Wd.	Extended	Compressed	Material	Lg.	Drive Style		Each
Steel Nose



		1"-8	1.5"	0.5"	4	31	Zinc-Plated Steel	5"	External Hex	33705A61	000000


		1"-8	1.5"	0.5"	16	68	Black-Oxide Steel	5"	External Hex	33705A41	00000

Spring Plunger Drivers

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

	For Spring Plunger Nose Type		Each
Steel



	1"-8	Ball, Long	3382A21	000000