3/8"-24 Knobs | McMaster-Carr

Filter by

System of Measurement

Thread Size

Mount Type

Threaded Through Hole

Material

Grip Style

Head Diameter

Color

Thread Depth

Stud Length

Thread Direction

Hub Diameter

Insert Material

Handle Style

Length

Hub Height

Stud Material

Hole Shape

Head Height

Export Control Classification Number (ECCN)

EAR99

RoHS

Compliant

Compliant with Exemptions

Not Compliant

DFARS Specialty Metals

REACH

Finish

Handle Length

Maximum Temperature

Minimum Temperature

65 Products

Threaded-Hole-Mount Ball Knobs


Style 1	Style 3

Install these traditional, easy-to-grip ball knobs on a threaded stud. They're good for control levers and push-pull rods.

303 Stainless Steel—303 stainless steel knobs have excellent corrosion resistance, making them the best choice for harsh environments. They also have good chemical resistance.

Aluminum—Aluminum knobs have mild corrosion resistance, are lightweight, and are nonmagnetic.

Brass—Brass knobs have good corrosion resistance and are nonmagnetic.

Phenolic—Phenolic knobs are a lightweight alternative to metal. They resist oil, grease, and solvents. Phenolic has good scratch resistance.

	Thread		Head					Each
	Size	Dp.	Dia.	Ht.	Insert Material	Temp. Range, ° F		1-9	10-Up
Style 1







				Steel

				3/8"-24	5/8"	1 3/8"	—	—	—	0000000	00000	00000


				3/8"-24	3/4"	1 7/8"	—	—	—	0000000	00000	00000




						303 Stainless Steel

						3/8"-24	5/8"	1 3/8"	—	—	—	0000000	00000	00000


						3/8"-24	3/4"	1 7/8"	—	—	—	0000000	00000	00000




								Aluminum

								3/8"-24	5/8"	1 3/8"	—	—	—	0000000	0000	0000


								3/8"-24	3/4"	1 7/8"	—	—	—	0000000	00000	00000




										Brass

										3/8"-24	5/8"	1 3/8"	—	—	—	00000000	00000	00000


										3/8"-24	3/4"	1 7/8"	—	—	—	00000000	00000	00000




												Black Phenolic

												3/8"-24	1/2"	1"	—	Brass	-30 to 400	0000000	0000	0000


												3/8"-24	1/2"	1 1/4"	—	Brass	-30 to 400	0000000	0000	0000
												3/8"-24	5/8"	1 3/8"	—	Brass	-30 to 400	0000000	0000	0000
												3/8"-24	7/8"	1 15/16"	—	Zinc-Plated Steel	-30 to 400	0000000	0000	0000
												3/8"-24	7/8"	2"	—	Zinc-Plated Steel	-30 to 400	0000000	0000	0000




														Red Phenolic

														3/8"-24	5/8"	1 3/8"	—	Brass	-30 to 400	0000000	0000	0000


3/8"-24	7/8"													1 15/16"	—	Zinc-Plated Steel	-30 to 400	0000000	0000	0000


Style 3







														Black Phenolic

														3/8"-24	5/8"	2"	1 9/16"	Zinc-Plated Steel	-30 to 400	0000000	0000	0000

Threaded-Hole Knobs


Style 1	Style 20	Style 23

Install these knobs on a threaded stud. They provide a secure grip to position, tighten, and hold fixtures, equipment, and machinery.

Style 1—Knurled-Head Grip

Style 1

Black-Oxide Steel—Steel knobs have a black-oxide finish for mild rust resistance.

303 Stainless Steel—303 stainless steel knobs have excellent corrosion resistance, making them the best choice for harsh environments. They also have good chemical resistance.

Brass—Brass knobs have good corrosion resistance and are nonmagnetic.

	Thread		Head		Hub			Each
	Sz.	Dp.	Dia.	Ht.	Dia.	Ht.		1-9	10-Up
Black-Oxide Steel



		3/8"-24	5/8"	2"	3/8"	1"	3/4"	0000000	00000	00000


		303 Stainless Steel



				3/8"-24	5/8"	2"	3/8"	1"	3/4"	00000000	00000	00000


				Brass



						3/8"-24	5/8"	2"	3/8"	1"	3/4"	0000000	00000	00000

Style 20—Three-Arm Grip

Style 20

Phenolic—Plastic knobs are a lightweight alternative to metal. They resist oil, grease, and solvents. Phenolic has good scratch resistance.

	Thread		Head		Hub					Each
	Sz.	Dp.	Dia.	Ht.	Dia.	Ht.	Insert Material	Temp. Range, ° F		1-9	10-Up
Black Phenolic



		3/8"-24	5/8"	2"	5/8"	3/4"	3/8"	Brass	-10 to 275	00000000	00000	00000

Style 23—Four-Arm Grip

Style 23

Phenolic—Plastic knobs are a lightweight alternative to metal. They resist oil, grease, and solvents. Phenolic has good scratch resistance.

	Thread		Head		Hub					Each
	Sz.	Dp.	Dia.	Ht.	Dia.	Ht.	Insert Material	Temp. Range, ° F		1-9	10-Up
Black Phenolic



		3/8"-24	5/8"	2"	1/2"	7/8"	1/2"	Brass	-10 to 275	0000000	00000	00000

Threaded Through-Hole Knobs


Style 1	Style 6

Long shafts can thread through these knobs for mounting versatility. The knobs provide a secure grip to position, tighten, and hold fixtures, equipment, and machinery.

Style 1—Knurled-Head Grip

Style 1

Black-Oxide Steel—Black-oxide steel knobs are stronger than iron and have mild rust resistance.

303 Stainless Steel—303 stainless steel knobs have excellent corrosion resistance, making them the best choice for harsh environments. They also have good chemical resistance.

	Thread		Head		Hub			Each
	Sz.	Dp.	Dia.	Ht.	Dia.	Ht.		1-9	10-Up
Black-Oxide Steel



		3/8"-24	1 1/8"	2"	3/8"	1"	3/4"	0000000	00000	00000


		303 Stainless Steel



				3/8"-24	1 1/8"	2"	3/8"	1"	3/4"	00000000	00000	00000

Style 6—Four-Arm Grip

Style 6

Phenolic—Plastic knobs are a lightweight alternative to metal. They resist oil, grease, and solvents. Phenolic has good scratch resistance.

	Thread		Head		Hub					Each
	Sz.	Dp.	Dia.	Ht.	Dia.	Ht.	Insert Material	Temp. Range, ° F		1-9	10-Up
Black Phenolic



		3/8"-24	5/8"	2"	1/2"	7/8"	1/2"	Brass	-30 to 400	0000000	00000	00000

Threaded-Stud Knobs

Style 1

Mount these knobs into a threaded hole. They provide a secure grip to position, tighten, and hold fixtures, equipment, and machinery.

Style 1—Knurled-Head Grip

Style 1

Black-Oxide Steel—Black-oxide steel knobs are stronger than iron and have mild rust resistance.

303 Stainless Steel—303 stainless steel knobs have excellent corrosion resistance, making them the best choice for harsh environments. They also have good chemical resistance.

Brass—Brass knobs have good corrosion resistance and are nonmagnetic.

			Head		Hub				Each
	Thread Size	Stud Lg.	Dia.	Ht.	Dia.	Ht.	Stud Material		1-9	10-Up
Black-Oxide Steel



		3/8"-24	1 3/4"	2"	3/8"	1"	3/4"	Steel	0000000	000000	000000


		303 Stainless Steel



				3/8"-24	1 3/4"	2"	3/8"	1"	3/4"	Stainless Steel	0000000	00000	00000


				Brass



						3/8"-24	1 3/4"	2"	3/8"	1"	3/4"	Stainless Steel	0000000	00000	00000

Oval Threaded-Hole-Mount Ball Knobs

Mount these oval, easy-to-grip ball knobs on a threaded stud. They're good for control levers and push-pull rods. Made of plastic, all resist oil, grease, and solvents.

Thread		Head						Each
Size	Dp.	Dia.	Ht.	Hub Dia.	Insert Material	Temp. Range, ° F		1-9	10-Up







			Black Phenolic

			3/8"-24	5/8"	1 1/8"	1 1/2"	1/2"	Brass	-30 to 400	0000000	00000	00000




					Red Phenolic

					3/8"-24	5/8"	1 1/8"	1 1/2"	1/2"	Brass	-30 to 400	00000000	0000	0000

Tapered Lever Handles

Style 3 (Fixed)

Use these handles as grips on hand wheels and cranks to operate machinery.

Style 3—Threaded Hole with Smooth Fixed Handle


Style 3 (Fixed)

Threaded-hole handles install on a threaded stud.

Phenolic—Phenolic has good scratch resistance. Phenolic handles are a lightweight alternative to metal. They resist oil, grease, and solvents.

	Thread			Dia.			Temp., ° F			Each
	Size	Dp.	Handle Lg.	(A)	(B)	Insert Material	Min.	Max.		1-9	10-Up
Black Phenolic



		3/8"-24	5/8"	3 7/8"	1"	5/8"	Brass	-30	400	00000000	00000	00000


		3/8"-24	2"	3 7/8"	1"	5/8"	Brass	-30	400	00000000	0000	0000

Knob-Grip Retractable Spring Plungers

With the most versatile handle we offer, these fit in tight spaces while still giving you something to grab. A tug retracts the nose so you can make controlled adjustments. Use these spring plungers for everything from positioning workpieces to changing the height of tables and platforms.

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.

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



		3/8"-24	0.67"	0.197"	0.197"	1.6	3.6	Black-Oxide Steel	1.58"	Nylon	13/16"	0000000	000000	———	0


		3/8"-24	0.67"	0.2"	0.2"	1.5	3.5	Black-Oxide Steel	1.81"	Nylon	13/16"	———	0	0000000	000000

Handle Nuts

Style A

Image of Attribute. Front orientation. Contains Annotated.

Use these handles for quick assembly and disassembly. Their offset grip provides leverage, making them a good alternative to wing nuts. Long shafts can thread through these handles for mounting versatility.

Zinc-Plated Iron—Zinc-plated iron handle nuts have corrosion resistance.

302 Stainless Steel—302 stainless steel handle nuts have excellent corrosion resistance, making them the best choice for harsh environments. They also have good chemical resistance.

		Thread
	Style	Size	Dp.	Handle Lg.	Projection	Hub Projection		Each
Threaded Through-Hole Mount







				Iron

				A	3/8"-24	5/8"	3 3/4"	1 13/16"	5/8"	000000000	00000




						Zinc-Plated Iron

						A	3/8"-24	5/8"	3 3/4"	1 13/16"	5/8"	000000000	0000




								302 Stainless Steel

								A	3/8"-24	3/4"	4 1/8"	1 5/8"	3/4"	00000000	00000

Ball-Lever Shafts

Attach a ball knob (not included) to one of these shafts to create custom handles for operating machinery. Mount the other end into a threaded hole. These shafts can also be used to create your own gear levers.

Black Oxide Steel—Steel shafts have a black-oxide finish for mild rust resistance.

303 Stainless Steel—Stainless steel shafts have excellent corrosion resistance, making them the best choice for harsh environments. They also have good chemical resistance.

		Stud						Each
	Thread Size	Lg. 1	Lg. 2	Handle Lg.	Dia.	Stud Material		1-9	10-Up
Threaded-Stud Mount







				Black Oxide Steel

				3/8"-24	1/2"	1/2"	2 5/8"	1/2"	Steel	0000000	000000	000000


				3/8"-24	1/2"	1/2"	6 5/8"	1/2"	Steel	0000000	00000	00000




						303 Stainless Steel

						3/8"-24	1/2"	1/2"	2 5/8"	1/2"	303 Stainless Steel	0000000	00000	00000


						3/8"-24	1/2"	1/2"	6 5/8"	1/2"	303 Stainless Steel	0000000	00000	00000

Push/Pull Mechanical Control Cables

Use the attached knob to control these flexible, ready-to-use cables. Weave them around obstructions to operate valves, throttle controls, and HVAC damper controls from a distance. The cables can be cut to length. They can also be panel mounted.

	Cable				Dynamic Load Cap., lb.			Knob				Panel Mount
	Lg., ft.	Outer Dia.	Core Dia.	Max. Stroke Lg.	Push	Pull	Bend Radius	Material	Dia.	Thread Size	Temp. Range, ° F		Each
Stainless Steel Cable Core with Plastic Cover



		10.75	0.31"	0.085"	5"	50	50	6"	Plastic	2"	3/8"-24	-40 to 225	000000	000000


		15.75	0.31"	0.085"	5"	50	50	6"	Plastic	2"	3/8"-24	-40 to 225	000000	00000

Stay-Put Threaded-Stud-Mount Folding Pull Handles

Detents keep these handles in the extended or folded position—they won't move until you reposition them. Insert studs into holes in your surface and secure from the backside to open and close a variety of doors and drawers on chests, crates, furniture, machines, and equipment. All of these handles have round grips that allow your hand to pivot in any direction.

303 Stainless Steel—Stainless steel handles have excellent corrosion resistance, making them the best choice for harsh environments. They also have good chemical resistance.

Anodized Aluminum—Aluminum handles have mild corrosion resistance, are lightweight, and are nonmagnetic.

	Stud Lg.	Grip Dia.	Projection	Pull Cap.	Mounting Fasteners Included		Each
Round Grip with Two Detents







	303 Stainless Steel—Dull

	90°	3"	3/8"-24	5/8"	5/16"	1 9/16"	Not Rated	Yes	0000000	000000


	90°	4"	3/8"-24	5/8"	5/16"	1 9/16"	Not Rated	Yes	0000000	00000
	90°	5"	3/8"-24	5/8"	5/16"	1 9/16"	Not Rated	Yes	0000000	00000
	90°	6"	3/8"-24	5/8"	5/16"	1 9/16"	Not Rated	Yes	0000000	00000




			Anodized Aluminum—Dull

			90°	3"	3/8"-24	5/8"	5/16"	1 9/16"	Not Rated	Yes	0000000	00000


			90°	4"	3/8"-24	5/8"	5/16"	1 9/16"	Not Rated	Yes	0000000	00000
			90°	5"	3/8"-24	5/8"	5/16"	1 9/16"	Not Rated	Yes	0000000	00000
			90°	6"	3/8"-24	5/8"	5/16"	1 9/16"	Not Rated	Yes	0000000	00000


			Round Grip with Three Detents







							303 Stainless Steel—Dull

							180°	3"	3/8"-24	5/8"	5/16"	1 9/16"	Not Rated	Yes	000000	00000


							180°	4"	3/8"-24	5/8"	5/16"	1 9/16"	Not Rated	Yes	000000	00000
							180°	5"	3/8"-24	5/8"	5/16"	1 9/16"	Not Rated	Yes	0000000	00000
							180°	6"	3/8"-24	5/8"	5/16"	1 9/16"	Not Rated	Yes	0000000	00000




									Anodized Aluminum—Dull

									180°	3"	3/8"-24	5/8"	5/16"	1 9/16"	Not Rated	Yes	000000	00000


									180°	4"	3/8"-24	5/8"	5/16"	1 9/16"	Not Rated	Yes	000000	00000
									180°	5"	3/8"-24	5/8"	5/16"	1 9/16"	Not Rated	Yes	000000	00000
									180°	6"	3/8"-24	5/8"	5/16"	1 9/16"	Not Rated	Yes	000000	00000

Create-Your-Own Push/Pull Mechanical Control Cables

Panel Mount

Pair these cables with a knob or lever (not included) to operate valves, throttle controls, and HVAC damper controls from a distance. They're flexible for weaving around obstructions.

Panel Mount—Panel-mount cables are also known as bulkhead mount cables. They have threaded fittings with hex nuts and washers at each end for mounting through a panel.

	Thread				Dynamic Load Cap., lb.					Panel Mount
	Size	Lg.	Overall Lg., ft.	Max. Stroke Lg.	Push	Pull	Bend Radius	Fitting Material	Temp. Range, ° F	For Panel Cutout Dia.	Fitting Lg.		Each
Stainless Steel Cable Core with Plastic Cover



		3/8"-24	1 3/8"	6	4"	500	500	6"	Zinc-Plated Steel	-65 to 225	3/4"	12 37/64"	00000000	0000000


		3/8"-24	1 3/8"	6	6"	300	300	6"	Zinc-Plated Steel	-65 to 225	3/4"	15 37/64"	00000000	000000

Accessories for Mechanical Control Cables

For Thread Size	Material	Relubrication	Includes		Each
3/8"-24	Zinc-Plated Carbon Steel	Required	External Spring	0000000	000000

For Thread Size	Material	Includes		Each
3/8"-24	Carbon Steel	Clevis Pin, Cotter Pin	0000000	000000

Threaded-Stud-Mount Pull Handles

Style 1

Insert studs into holes in your surface and secure from the backside to open and close a variety of doors and drawers, including those on furniture, machines, and equipment. All have round grips that allow your hand to pivot in any direction.

303 Stainless Steel—Stainless steel handles have excellent corrosion resistance, making them the best choice for harsh environments. They also have good chemical resistance.

	Grip Dia.	Projection	Pull Cap.	Mounting Fasteners Included		Each
Style 1—Round Grip







	303 Stainless Steel—Polished

	4"	3/8"-24	5/8"	3/8"	1 1/2"	Not Rated	Yes	0000000	000000

Extra-Long Threaded-Hole-Mount Pull Handles

Style 1

For applications that require a large gripping area, these handles have a center-to-center distance of 12" or more. Thread screws through holes from the back of your surface into the handles to open and close a variety of doors and drawers on furniture, machines, and equipment. Some handles have legs that are a different material.

Round Grip—Round grips allow your hand to pivot in any direction.

Anodized Aluminum—Aluminum handles have mild corrosion resistance, are lightweight, and are nonmagnetic.

	Mounting Hole		Thread
	No. of	Ctr.-to-Ctr. Wd.	Size	Dp.	Grip Dia.	Projection	Pull Cap.	Mounting Screw Lg.	Mounting Fasteners Included		Each
Style 1—Round Grip







				Anodized Aluminum—Dull

				2	33 1/16"	3/8"-24	1"	1"	2 1/4"	Not Rated	2 5/8"	Yes	000000	000000


				2	45 1/16"	3/8"-24	1"	1"	2 1/4"	Not Rated	2 5/8"	Yes	000000	000000