Cast Iron Knobs | McMaster-Carr

Filter by

Thread Size

Grip Style

Mount Type

Threaded Through Hole

Unthreaded Through Hole

Material

Head Diameter

Hub Height

Stud Length

Hub Diameter

Hole Diameter

Head Height

Thread Depth

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

REACH

RoHS

Compliant with Exemptions

Head Width

Hole Depth

For Maximum Bar Diameter

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"	0000000	000000	00000


		5/16"-18	1"	1 1/2"	7/16"	5/8"	9/16"	0000000	00000	0000
		3/8"-16	1"	2"	7/16"	3/4"	9/16"	0000000	00000	00000
		1/2"-13	1 1/2"	2 9/16"	1/2"	1 1/8"	1"	0000000	00000	00000
		5/8"-11	2 1/4"	2 1/2"	1/2"	1"	1 3/4"	0000000	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	0000000	000000	000000


		1/2"-13	1 1/2"	2 9/16"	1/2"	1 1/8"	1"	1/4"-20	Yes	0000000	00000	00000
		5/8"-11	2 1/4"	2 1/2"	1/2"	1"	1 3/4"	1/4"-20	Yes	0000000	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"	0000000	000000	000000


		3/4"-10	1 3/4"	3 1/4"	1/2"	1 1/2"	1 1/4"	0000000	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	0000000	000000	000000


		3/4"-10	1 3/4"	3 1/4"	1/2"	1 1/2"	1 1/4"	1/4"-20	Yes	0000000	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"	00000000	000000	000000


		3/8"-16	2"	1 1/2"	1/2"	7/8"	1 1/2"	0000000	00000	00000
		3/8"-16	2"	2"	1/2"	7/8"	1 1/2"	0000000	00000	00000
		1/2"-13	1 1/4"	2 3/4"	1/2"	1 1/4"	3/4"	0000000	00000	00000
		1/2"-13	2"	2 3/4"	1/2"	1 1/4"	1 1/2"	0000000	00000	00000
		3/4"-10	1 1/2"	3 1/2"	5/8"	1 5/8"	7/8"	0000000	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	0000000	000000	000000


		1/2"-13	1 1/4"	2 3/4"	1/2"	1 1/4"	3/4"	1/4"-20	Yes	0000000	00000	00000
		1/2"-13	2"	2 3/4"	1/2"	1 1/4"	1 1/2"	1/4"-20	Yes	0000000	00000	00000
		3/4"-10	1 1/2"	3 1/2"	5/8"	1 5/8"	7/8"	1/4"-20	Yes	0000000	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-Up
Zinc-Plated Iron



		1/4"-20	1 3/4"	1 1/2"	3/8"	5/8"	1/2"	Steel	0000000	000000	00000


		1/4"-20	3"	1 1/2"	3/8"	5/8"	1/2"	Steel	0000000	00000	00000
		5/16"-18	1 3/4"	2"	3/8"	3/4"	1/2"	Steel	0000000	00000	00000
		5/16"-18	3"	2"	3/8"	3/4"	1/2"	Steel	0000000	00000	00000
		3/8"-16	1 3/4"	2"	3/8"	3/4"	1/2"	Steel	0000000	00000	00000
		3/8"-16	3"	2"	3/8"	3/4"	1/2"	Steel	000000	00000	00000
		1/2"-13	1 3/4"	2 1/2"	1/2"	1 1/8"	1"	Steel	0000000	00000	00000
		1/2"-13	3"	2 1/2"	1/2"	1 1/8"	1"	Steel	0000000	00000	00000
		5/8"-11	1 3/4"	2 1/2"	1/2"	1 1/8"	1"	Steel	0000000	00000	00000
		5/8"-11	3"	2 1/2"	1/2"	1 1/8"	1"	Steel	0000000	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-Up
Iron



		1/4"-20	1 3/4"	1 1/2"	3/8"	5/8"	1/2"	Steel	00000000	00000	00000


		1/4"-20	3"	1 1/2"	3/8"	5/8"	1/2"	Steel	00000000	00000	00000
		5/16"-18	1 3/4"	2"	3/8"	3/4"	5/8"	Steel	00000000	00000	0000
		5/16"-18	3"	2"	3/8"	3/4"	5/8"	Steel	00000000	00000	00000
		3/8"-16	1 3/4"	2"	3/8"	3/4"	5/8"	Steel	00000000	00000	0000
		3/8"-16	3"	2"	3/8"	3/4"	5/8"	Steel	00000000	00000	00000
		1/2"-13	1 3/4"	2 1/2"	1/2"	1 1/8"	1"	Steel	00000000	00000	00000
		1/2"-13	3"	2 1/2"	1/2"	1 1/8"	1"	Steel	00000000	00000	00000
		5/8"-11	1 3/4"	2 1/2"	1/2"	1 1/8"	1"	Steel	00000000	00000	00000
		5/8"-11	3"	2 1/2"	1/2"	1 1/8"	1"	Steel	00000000	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"	0000000	00000	00000


		1 1/2"	7/16"	5/8"	9/16"	0000000	0000	0000
		2"	7/16"	3/4"	9/16"	0000000	0000	0000
		2 1/2"	1/2"	1"	1 3/4"	0000000	00000	00000
		2 9/16"	1/2"	1 1/8"	1"	0000000	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"	0000000	000000	000000


		3 1/4"	1/2"	1 1/2"	1 1/4"	0000000	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"	0000000	00000	00000


		2"	1/2"	7/8"	1/2"	0000000	0000	0000
		2"	1/2"	7/8"	1 1/2"	0000000	00000	0000
		2 3/4"	1/2"	1 1/4"	3/4"	0000000	00000	00000
		2 3/4"	1/2"	1 1/4"	1 1/2"	0000000	00000	00000
		3 1/2"	5/8"	1 5/8"	7/8"	0000000	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"	0000000	000000	00000


		5/16"	1"	1 1/2"	7/16"	5/8"	9/16"	0000000	00000	0000
		3/8"	1"	2"	7/16"	3/4"	9/16"	0000000	00000	00000
		1/2"	1 1/2"	2 9/16"	1/2"	1 1/8"	1"	0000000	00000	00000
		5/8"	2 1/4"	2 1/2"	1/2"	1"	1 3/4"	0000000	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"	00000000	000000	000000


		3/8"	2"	1 1/2"	1/2"	7/8"	1 1/2"	0000000	00000	00000
		3/8"	2"	2"	1/2"	7/8"	1 1/2"	0000000	00000	00000
		1/2"	1 1/4"	2 3/4"	1/2"	1 1/4"	3/4"	0000000	00000	00000
		1/2"	2"	2 3/4"	1/2"	1 1/4"	1 1/2"	0000000	00000	00000
		3/4"	1 1/2"	3 1/2"	5/8"	1 5/8"	7/8"	0000000	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"	0000000	000000	000000


		1/2"-13	1 3/8"	7/16"	2"	1 1/4"	1 1/4"	7/8"	0000000	00000	00000
		1/2"-13	1 1/2"	11/16"	2 1/2"	1 7/16"	1 1/2"	15/16"	0000000	00000	00000
		5/8"-11	1 3/8"	7/16"	2"	1 1/4"	1 1/4"	7/8"	0000000	00000	00000
		5/8"-11	1 1/2"	11/16"	2 1/2"	1 7/16"	1 1/2"	15/16"	0000000	00000	00000
		3/4"-10	1 1/2"	11/16"	2 1/2"	1 7/16"	1 1/2"	15/16"	0000000	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"	000000	000000	000000


		11/16"	2 1/2"	1 7/16"	1 1/2"	15/16"	000000	00000	00000