Solid Hub Knobs | McMaster-Carr

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61 Products

Machinable-Hub Knobs


Style 1	Style 2	Style 3	Style 4

Style 5	Style 6	Style 7	Style 8

Mill specific holes or keyways in the hub to meet your specifications, or weld in place. These knobs provide a secure grip to position, tighten, and hold fixtures, equipment, and machinery.

Style 1—Knurled-Head Grip

Style 1

Black-Oxide 1215 Carbon Steel—Steel knobs are stronger than iron. They 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.

6061 Aluminum—Aluminum knobs have mild corrosion resistance, are lightweight, and are nonmagnetic.

	Head		Hub			Each
	Dia.	Ht.	Dia.	Ht.		1-9	10-Up
Black-Oxide 1215 Carbon Steel



		3/4"	1/4"	1/2"	3/8"	6121K91	00000	00000


		1"	1/4"	5/8"	1/2"	6121K92	0000	0000
		1 1/2"	5/16"	3/4"	11/16"	6121K93	0000	0000
		2"	3/8"	1"	3/4"	6121K94	0000	0000
		2 1/2"	9/16"	1 1/2"	15/16"	6121K95	00000	0000
		3"	5/8"	1 3/4"	1 1/8"	6121K96	00000	00000


		303 Stainless Steel



				3/4"	1/4"	1/2"	3/8"	60205K34	0000	0000


				1"	1/4"	5/8"	1/2"	60205K35	0000	0000
				1"	3/8"	1/2"	7/16"	6399K41	00000	00000
				1 1/2"	5/16"	3/4"	11/16"	60205K36	00000	00000
				2"	3/8"	1"	3/4"	60205K37	00000	00000
				2"	9/16"	13/16"	9/16"	6399K42	00000	00000
				2 1/2"	9/16"	1 1/2"	15/16"	60205K38	00000	00000
				3"	5/8"	1 3/4"	1 1/8"	60205K39	00000	00000
				3"	11/16"	1 1/4"	9/16"	6399K43	00000	00000


				Brass



						3/4"	1/4"	1/2"	3/8"	5125K51	0000	0000


						1"	1/4"	5/8"	1/2"	5125K52	0000	0000
						1 1/2"	5/16"	3/4"	11/16"	5125K53	00000	00000
						2"	3/8"	1"	3/4"	5125K54	00000	00000


						6061 Aluminum



								1"	3/8"	1/2"	7/16"	6077K12	0000	0000


								2"	9/16"	13/16"	9/16"	6077K14	00000	00000
								3"	11/16"	1 1/4"	9/16"	6077K16	00000	00000

Style 2—Ribbed Grip

Style 2

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

	Head		Hub				Each
	Dia.	Ht.	Dia.	Ht.	Temp. Range, ° F		1-9	10-Up
Black Phenolic



		1 1/4"	3/8"	5/8"	3/8"	-30 to 400	6479K13	00000	00000


		1 3/4"	3/8"	3/4"	3/8"	-30 to 400	6479K31	0000	0000

Style 3—Four-Arm Grip

Style 3

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

6061 Aluminum—Aluminum knobs have mild corrosion resistance, are lightweight, and are nonmagnetic.

	Head		Hub			Each
	Dia.	Ht.	Dia.	Ht.		1-9	10-Up
Brass



		1"	3/8"	1/2"	1/2"	5125K55	00000	00000


		1 1/2"	1/2"	5/8"	3/8"	5125K56	00000	00000
		2"	1/2"	13/16"	1/2"	5125K57	00000	00000


		6061 Aluminum



				1"	3/8"	1/2"	1/2"	61135K11	0000	0000


				1 1/2"	1/2"	5/8"	3/8"	61135K12	0000	0000
				2"	1/2"	13/16"	1/2"	61135K13	0000	0000
				2 1/2"	9/16"	1"	9/16"	61135K14	0000	0000
				3"	5/8"	1 1/4"	5/8"	61135K15	00000	00000

Style 4—Four-Arm Grip

Style 4

	Head		Hub			Each
	Dia.	Ht.	Dia.	Ht.		1-9	10-Up
Iron



		1 1/8"	5/16"	9/16"	3/8"	6042K37	00000	00000


		1 1/2"	7/16"	5/8"	9/16"	6042K38	0000	0000
		2"	7/16"	3/4"	9/16"	6042K39	0000	0000
		2 1/2"	1/2"	1"	1 3/4"	6042K42	00000	00000
		2 9/16"	1/2"	1 1/8"	1"	6042K41	0000	0000

Style 5—Four-Arm Grip

Style 5

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

	Head		Hub			Each
	Dia.	Ht.	Dia.	Ht.		1-9	10-Up
319 Aluminum



		1 1/4"	5/16"	9/16"	9/16"	6047K11	00000	00000


		1 1/2"	3/8"	11/16"	11/16"	6047K12	0000	0000
		2 1/8"	1/2"	7/8"	15/16"	6047K13	0000	0000
		3"	11/16"	1 3/8"	1 1/4"	6047K14	0000	0000

Style 6—Five-Arm Grip

Style 6

	Head		Hub			Each
	Dia.	Ht.	Dia.	Ht.		1-9	10-Up
Iron



		3"	1/2"	1 1/4"	1 1/4"	6042K43	000000	000000


		3 1/4"	1/2"	1 1/2"	1 1/4"	6042K44	00000	00000

Style 7—Six-Arm Grip

Style 7

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

	Head		Hub			Each
	Dia.	Ht.	Dia.	Ht.		1-9	10-Up
Iron



		1 1/2"	1/2"	7/8"	1 1/2"	6042K31	00000	00000


		2"	1/2"	7/8"	1/2"	6042K36	0000	0000
		2"	1/2"	7/8"	1 1/2"	6042K32	00000	0000
		2 3/4"	1/2"	1 1/4"	3/4"	6042K33	00000	00000
		2 3/4"	1/2"	1 1/4"	1 1/2"	6042K34	00000	00000
		3 1/2"	5/8"	1 5/8"	7/8"	6042K35	00000	00000


		319 Aluminum



				1 1/2"	1/2"	3/4"	7/8"	61515K11	0000	0000


				2"	3/4"	1"	7/8"	61515K12	0000	0000

Style 8—Eight-Arm Grip

Style 8

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

	Head		Hub			Each
	Dia.	Ht.	Dia.	Ht.		1-9	10-Up
319 Aluminum



		3 1/2"	3/4"	1 1/4"	1 1/8"	61515K14	00000	00000

Machinable-Hub Knobs with Handle

A handle makes these knobs easy to turn. Mill specific holes or keyways in the hub to meet your specifications, or weld in place. These knobs provide a secure grip to position, tighten, and hold fixtures, equipment, and machinery.

Knurled-Head Grip

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.

6061 Aluminum—6061 aluminum knobs have mild corrosion resistance, are lightweight, and are nonmagnetic.

	Head		Hub		Handle			Each
	Dia.	Ht.	Dia.	Ht.	Lg.	Material		1-9	10-Up
303 Stainless Steel



		2"	9/16"	13/16"	9/16"	1 9/32"	Chrome-Plated Brass	6399K47	000000	000000


		3"	9/16"	1 1/4"	11/16"	1 1/2"	Chrome-Plated Brass	6399K48	00000	00000


		6061 Aluminum



				2"	9/16"	13/16"	9/16"	1 1/4"	Chrome-Plated Brass	6077K18	00000	00000


				3"	11/16"	1 1/4"	9/16"	1 1/2"	Chrome-Plated Brass	6077K21	00000	00000

Machinable-Hub Bar Knobs

Mill specific holes or keyways in the hub to meet your specifications, or weld in place. Insert a bar between the arms and twist. The bar provides maximum leverage to tighten knobs securely. Made of iron, these knobs have a zinc-plated finish for corrosion resistance.

Four-Arm Grip

		Head		Hub			Each
	For Max. Bar Dia.	Wd.	Ht.	Dia.	Ht.		1-9	10-Up
Zinc-Plated Iron



		7/16"	2"	1 1/4"	1 1/4"	7/8"	6145K1	000000	000000


		11/16"	2 1/2"	1 7/16"	1 1/2"	15/16"	6145K2	00000	00000

Palm-Grip Machinable-Hub Knobs

The domed top allows you to firmly hold these knobs in the palm of your hand. Mill specific holes or keyways in the hub to meet your specifications, or weld in place. Use these knobs to position, tighten, and hold fixtures, equipment, and machinery. Made of aluminum, all have mild corrosion resistance, are lightweight, and are nonmagnetic.

Knurled-Head Grip

	Head		Hub			Each
	Dia.	Ht.	Dia.	Ht.		1-9	10-Up
6061 Aluminum



		1"	1/2"	5/8"	7/16"	7762K61	000000	000000


		2"	11/16"	1"	1/2"	7762K62	00000	00000
		2 1/4"	3/4"	1 1/4"	5/8"	7762K63	00000	00000