1/2"-20 Knobs | McMaster-Carr

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24 Products

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



		1/2"-20	1 1/2"	2 1/2"	9/16"	1 1/2"	15/16"	6121K57	000000	000000


		303 Stainless Steel



				1/2"-20	1 1/2"	2 1/2"	9/16"	1 1/2"	15/16"	60205K84	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



		1/2"-20	5/8"	2"	1/2"	7/8"	5/8"	Brass	-30 to 400	5993K34	00000	00000

Threaded-Hole-Mount Ball Knobs

Style 1

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







				Steel

				1/2"-20	5/8"	1 3/8"	—	—	6045K48	00000	00000




						303 Stainless Steel

						1/2"-20	5/8"	1 3/8"	—	—	6954K34	00000	00000




								Aluminum

								1/2"-20	5/8"	1 3/8"	—	—	6940K48	0000	0000




										Brass

										1/2"-20	5/8"	1 3/8"	—	—	60215K69	00000	00000




												Black Phenolic

												1/2"-20	5/8"	1 1/4"	Brass	-30 to 400	6046K54	0000	0000


												1/2"-20	5/8"	1 3/8"	Zinc-Plated Steel	-30 to 400	6046K24	0000	0000
												1/2"-20	1 1/8"	1 15/16"	Brass	-30 to 400	6046K28	0000	0000




														Red Phenolic

														1/2"-20	5/8"	1 3/8"	Zinc-Plated Steel	-30 to 400	6146K24	0000	0000


														1/2"-20	1 1/8"	1 15/16"	Brass	-30 to 400	6146K28	0000	0000

Threaded-Hole Knobs


Style 1	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.

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



		1/2"-20	3/4"	2 1/2"	9/16"	1 1/2"	15/16"	6121K17	000000	000000


		303 Stainless Steel



				1/2"-20	3/4"	2 1/2"	9/16"	1 1/2"	15/16"	60205K49	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



		1/2"-20	5/8"	2"	1/2"	7/8"	5/8"	Brass	-10 to 275	5993K44	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.

			Head		Hub				Each
	Thread Size	Stud Lg.	Dia.	Ht.	Dia.	Ht.	Stud Material		1-9	10-99	100-Up
Black-Oxide Steel



		1/2"-20	1 3/4"	2 1/2"	9/16"	1 1/2"	15/16"	Steel	6079K35	000000	000000	000000


		303 Stainless Steel



				1/2"-20	1 3/4"	2 1/2"	9/16"	1 1/2"	15/16"	Stainless Steel	6091K64	00000	00000	00000

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	1/2"-20	5/8"	3 15/16"	1 7/8"	5/8"	91043A116	00000




						Zinc-Plated Iron

						A	1/2"-20	5/8"	3 15/16"	1 13/16"	5/8"	91044A116	0000




								302 Stainless Steel

								A	1/2"-20	3/4"	4 1/8"	1 5/8"	3/4"	3577K114	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

				1/2"-20	5/8"	5/8"	4 1/8"	5/8"	Steel	8384K48	000000	000000


				1/2"-20	5/8"	5/8"	6 1/8"	5/8"	Steel	8384K49	00000	00000




						303 Stainless Steel

						1/2"-20	5/8"	5/8"	4 1/8"	5/8"	303 Stainless Steel	8384K74	00000	00000


						1/2"-20	5/8"	5/8"	6 1/8"	5/8"	303 Stainless Steel	8384K75	00000	00000