Cast Iron Knobs | McMaster-Carr

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74 Products

Threaded Through-Hole Knobs


Style 7	Style 8	Style 9	Style 10	Style 11	Style 12

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 7—Four-Arm Grip

Style 7

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



		1/4"-20	11/16"	1 1/8"	5/16"	9/16"	3/8"	6042K77	000000	00000


		5/16"-18	1"	1 1/2"	7/16"	5/8"	9/16"	6042K78	00000	0000
		3/8"-16	1"	2"	7/16"	3/4"	9/16"	6042K79	00000	00000
		1/2"-13	1 1/2"	2 9/16"	1/2"	1 1/8"	1"	6042K81	00000	00000
		5/8"-11	2 1/4"	2 1/2"	1/2"	1"	1 3/4"	6042K82	00000	00000

Style 8—Four-Arm Grip

Style 8

	Thread		Head		Hub					Each
	Sz.	Dp.	Dia.	Ht.	Dia.	Ht.	Set Screw Thread Size	Set Screw Included		1-9	10-Up
Iron



		3/8"-16	1"	2"	7/16"	3/4"	9/16"	1/4"-20	Yes	3948T25	000000	000000


		1/2"-13	1 1/2"	2 9/16"	1/2"	1 1/8"	1"	1/4"-20	Yes	3948T26	00000	00000
		5/8"-11	2 1/4"	2 1/2"	1/2"	1"	1 3/4"	1/4"-20	Yes	3948T27	00000	00000

Style 9—Five-Arm Grip

Style 9

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



		5/8"-11	1 3/4"	3"	1/2"	1 1/4"	1 1/4"	6042K83	000000	000000


		3/4"-10	1 3/4"	3 1/4"	1/2"	1 1/2"	1 1/4"	6042K84	00000	00000

Style 10—Five-Arm Grip

Style 10

	Thread		Head		Hub					Each
	Sz.	Dp.	Dia.	Ht.	Dia.	Ht.	Set Screw Thread Size	Set Screw Included		1-9	10-Up
Iron



		5/8"-11	1 3/4"	3"	1/2"	1 1/4"	1 1/4"	1/4"-20	Yes	3948T28	000000	000000


		3/4"-10	1 3/4"	3 1/4"	1/2"	1 1/2"	1 1/4"	1/4"-20	Yes	3948T29	00000	00000

Style 11—Six-Arm Grip

Style 11

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



		3/8"-16	1"	2"	1/2"	7/8"	1/2"	6042K161	000000	000000


		3/8"-16	2"	1 1/2"	1/2"	7/8"	1 1/2"	6042K71	00000	00000
		3/8"-16	2"	2"	1/2"	7/8"	1 1/2"	6042K72	00000	00000
		1/2"-13	1 1/4"	2 3/4"	1/2"	1 1/4"	3/4"	6042K73	00000	00000
		1/2"-13	2"	2 3/4"	1/2"	1 1/4"	1 1/2"	6042K74	00000	00000
		3/4"-10	1 1/2"	3 1/2"	5/8"	1 5/8"	7/8"	6042K75	00000	00000

Style 12—Six-Arm Grip

Style 12

	Thread		Head		Hub					Each
	Sz.	Dp.	Dia.	Ht.	Dia.	Ht.	Set Screw Thread Size	Set Screw Included		1-9	10-Up
Iron



		3/8"-16	2"	2"	1/2"	7/8"	1 1/2"	1/4"-20	Yes	3948T21	000000	000000


		1/2"-13	1 1/4"	2 3/4"	1/2"	1 1/4"	3/4"	1/4"-20	Yes	3948T22	00000	00000
		1/2"-13	2"	2 3/4"	1/2"	1 1/4"	1 1/2"	1/4"-20	Yes	3948T23	00000	00000
		3/4"-10	1 1/2"	3 1/2"	5/8"	1 5/8"	7/8"	1/4"-20	Yes	3948T24	00000	00000

Threaded-Stud Knobs


Style 1	Style 14

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

Zinc-Plated Iron—Zinc-plated iron knobs have mild rust resistance.

			Head		Hub				Each
	Thread Size	Stud Lg.	Dia.	Ht.	Dia.	Ht.	Stud Material		1-9	10-99	100-Up
Zinc-Plated Iron



		1/4"-20	1 3/4"	1 1/2"	3/8"	5/8"	1/2"	Steel	6042K85	000000	00000	00000


		1/4"-20	3"	1 1/2"	3/8"	5/8"	1/2"	Steel	6042K86	00000	00000	0000
		5/16"-18	1 3/4"	2"	3/8"	3/4"	1/2"	Steel	6042K87	00000	00000	0000
		5/16"-18	3"	2"	3/8"	3/4"	1/2"	Steel	6042K88	00000	00000	0000
		3/8"-16	1 3/4"	2"	3/8"	3/4"	1/2"	Steel	6042K89	00000	00000	0000
		3/8"-16	3"	2"	3/8"	3/4"	1/2"	Steel	6042K9	00000	00000	00000
		1/2"-13	1 3/4"	2 1/2"	1/2"	1 1/8"	1"	Steel	6042K91	00000	00000	00000
		1/2"-13	3"	2 1/2"	1/2"	1 1/8"	1"	Steel	6042K92	00000	00000	00000
		5/8"-11	1 3/4"	2 1/2"	1/2"	1 1/8"	1"	Steel	6042K93	00000	00000	00000
		5/8"-11	3"	2 1/2"	1/2"	1 1/8"	1"	Steel	6042K94	00000	00000	00000

Style 14—Four-Arm Grip

Style 14

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



		1/4"-20	1 3/4"	1 1/2"	3/8"	5/8"	1/2"	Steel	62215K51	00000	00000	00000


		1/4"-20	3"	1 1/2"	3/8"	5/8"	1/2"	Steel	62215K52	00000	00000	0000
		5/16"-18	1 3/4"	2"	3/8"	3/4"	5/8"	Steel	62215K53	00000	0000	0000
		5/16"-18	3"	2"	3/8"	3/4"	5/8"	Steel	62215K54	00000	00000	0000
		3/8"-16	1 3/4"	2"	3/8"	3/4"	5/8"	Steel	62215K55	00000	0000	0000
		3/8"-16	3"	2"	3/8"	3/4"	5/8"	Steel	62215K56	00000	00000	0000
		1/2"-13	1 3/4"	2 1/2"	1/2"	1 1/8"	1"	Steel	62215K57	00000	00000	00000
		1/2"-13	3"	2 1/2"	1/2"	1 1/8"	1"	Steel	62215K58	00000	00000	00000
		5/8"-11	1 3/4"	2 1/2"	1/2"	1 1/8"	1"	Steel	62215K59	00000	00000	00000
		5/8"-11	3"	2 1/2"	1/2"	1 1/8"	1"	Steel	62215K61	00000	00000	00000

Unthreaded Through-Hole Knobs


Style 4	Style 7

Create custom threads or secure with a set screw to provide a firm grip to position, tighten, and hold fixtures, equipment, and machinery. Long shafts can pass through these knobs for mounting versatility.

Style 4—Four-Arm Grip

Style 4

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



		1/4"	11/16"	1 1/8"	5/16"	9/16"	3/8"	6042K57	000000	00000


		5/16"	1"	1 1/2"	7/16"	5/8"	9/16"	6042K58	00000	0000
		3/8"	1"	2"	7/16"	3/4"	9/16"	6042K59	00000	00000
		1/2"	1 1/2"	2 9/16"	1/2"	1 1/8"	1"	6042K61	00000	00000
		5/8"	2 1/4"	2 1/2"	1/2"	1"	1 3/4"	6042K62	00000	00000

Style 7—Six-Arm Grip

Style 7

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



		3/8"	1"	2"	1/2"	7/8"	1/2"	6042K162	000000	000000


		3/8"	2"	1 1/2"	1/2"	7/8"	1 1/2"	6042K51	00000	00000
		3/8"	2"	2"	1/2"	7/8"	1 1/2"	6042K52	00000	00000
		1/2"	1 1/4"	2 3/4"	1/2"	1 1/4"	3/4"	6042K53	00000	00000
		1/2"	2"	2 3/4"	1/2"	1 1/4"	1 1/2"	6042K54	00000	00000
		3/4"	1 1/2"	3 1/2"	5/8"	1 5/8"	7/8"	6042K55	00000	00000

Machinable-Hub Knobs


Style 4	Style 6	Style 7

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 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 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

	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

Threaded Through-Hole Bar Knobs

Install these knobs on a threaded stud. 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

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



		3/8"-16	1 3/8"	7/16"	2"	1 1/4"	1 1/4"	7/8"	6145K14	000000	000000


		1/2"-13	1 3/8"	7/16"	2"	1 1/4"	1 1/4"	7/8"	6145K15	00000	00000
		1/2"-13	1 1/2"	11/16"	2 1/2"	1 7/16"	1 1/2"	15/16"	6145K22	00000	00000
		5/8"-11	1 3/8"	7/16"	2"	1 1/4"	1 1/4"	7/8"	6145K16	00000	00000
		5/8"-11	1 1/2"	11/16"	2 1/2"	1 7/16"	1 1/2"	15/16"	6145K23	00000	00000
		3/4"-10	1 1/2"	11/16"	2 1/2"	1 7/16"	1 1/2"	15/16"	6145K24	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