Six-Lobe Knobs | McMaster-Carr

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47 Products

Threaded Through-Hole Knobs


Style 11	Style 12	Style 13

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 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

Style 13—Six-Arm Grip

Style 13

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

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



		M6 × 1 mm	18	40	15	21	13	Brass	0 to 240	0000000	00000	00000


		M8 × 1.25 mm	18	40	15	21	13	Brass	0 to 240	0000000	0000	0000
		M8 × 1.25 mm	18	50	17	24	15	Brass	0 to 240	0000000	0000	0000
		M10 × 1.5 mm	18	40	15	21	13	Brass	0 to 240	0000000	0000	0000
		M10 × 1.5 mm	18	50	17	24	15	Brass	0 to 240	0000000	0000	0000
		M12 × 1.75 mm	18	50	17	24	15	Brass	0 to 240	0000000	0000	0000
		M12 × 1.75 mm	25	60	20	28	15	Brass	0 to 240	0000000	0000	0000
		M16 × 2 mm	25	60	20	28	15	Brass	0 to 240	0000000	00000	0000
		M16 × 2 mm	25	70	21	32	21	Brass	0 to 240	0000000	00000	00000

Screw-Head Mount Knob Assortments


Inch Assortment	Metric Assortment

Keep a convenient selection of knobs on hand. To build a custom knob or thumb screw, pair one of these knobs with a socket head screw. Press the knob and screw together using a bench vise or an arbor press. Use these knobs to provide a secure grip to position, tighten, and hold fixtures, equipment, and machinery. Made of plastic, they resist oil, grease, and solvents.

	For Screw Size	Temp. Range, ° F		Each
Black Acetal







	For Socket Head Screws

	295	Knurled Head Single Arm Two Arm Six Arm	140 15 80 60	No. 4, No. 6, No. 8, No. 10, 1/4", 5/16" No. 10, 1/4", 5/16" No. 10, 1/4", 5/16", 3/8" 1/4", 5/16", 3/8"	35 to 180	000000000	0000000


	260	Knurled Head Two Arm Six Arm	120 80 60	M3, M4, M5, M6, M8 M5, M6, M8, M10 M6, M8, M10	35 to 180	000000000	000000

Screw-Head Mount Knobs


Style 7 (Front View)	Style 7 (Back View)

To build a custom knob or thumb screw, pair one of these knobs with a hex or socket head screw and press the knob and screw together. All of these knobs provide a secure grip to position, tighten, and hold fixtures, equipment, and machinery. Made of plastic, they resist oil, grease, and solvents. Use color to identify equipment controls and components at a glance.

Style 7—Six-Arm Grip


Style 7 (Front View)	Style 7 (Back View)

		Head
	For Screw Size	Dia.	Ht.	Temp. Range, ° F	Choose a Color	Pkg. Qty.		Pkg.
Acetal—For Socket Head Screws



		1/4"	1 1/2"	15/32"	35 to 180	Black , Gray , Red , Yellow	10	000000000	00000


		5/16"	1 1/2"	13/32"	35 to 180	Black , Gray , Red , Yellow	10	000000000	0000
		3/8"	1 1/2"	15/32"	35 to 180	Black , Gray , Red , Yellow	10	000000000	0000
		M6	38 mm	12.2 mm	35 to 180	Black , Gray , Red , Yellow	10	000000000	0000
		M8	38 mm	10.4 mm	35 to 180	Black , Gray , Red , Yellow	10	000000000	0000
		M10	38 mm	12.5 mm	35 to 180	Black , Gray , Red , Yellow	10	000000000	0000

Threaded-Hole Knobs

Style 27

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

Style 27—Six-Arm Grip

Style 27

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

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



		1/4"-20	3/4"	1 1/2"	7/16"	7/8"	7/8"	000000000	00000	00000


		3/8"-16	3/4"	2"	5/8"	1"	7/8"	000000000	0000	0000

Unthreaded Through-Hole Knobs

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 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

Unthreaded-Hole Knobs

Style 10

Tap custom threads or secure with a set screw to provide a firm grip to position, tighten, and hold fixtures, equipment, and machinery.

Style 10—Six-Arm Grip

Style 10

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

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



		1/4"	3/4"	1 1/2"	7/16"	7/8"	7/8"	000000000	00000	00000


		3/8"	7/8"	2"	9/16"	1"	1"	000000000	0000	0000

Machinable-Hub Knobs

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 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"	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


		319 Aluminum



				1 1/2"	1/2"	3/4"	7/8"	00000000	0000	0000


				2"	3/4"	1"	7/8"	00000000	0000	0000

Threaded-Stud Precise-Control Indicating Knobs

Six-Arm Grip

Mount these knobs into a threaded hole. Turn the knob to move the stud 0.005" per graduation and make precise adjustments. Secure with the included locknut. Made of acetal, these knobs resist oil, grease, and solvents.

		Head		Stud
	Thread Size	Dia.	Ht.	Lg.	Material	Temp. Range, ° F	Features		Each
Six-Arm Grip







				Black Acetal

				1/4"-20	1 1/2"	1/2"	3"	Steel	35 to 180	Locknut	000000000	00000

Screw-Head Mount Precise-Control Indicating Knobs

Six-Arm

Grip

To build a custom precise-control knob or thumb screw, pair one of these knobs with a socket head screw. Press the knob and screw together using a bench vise or an arbor press. Then, turn the knob to move the screw 0.005" per graduation and make precise adjustments. Made of acetal, these knobs resist oil, grease, and solvents.

		Head
	For Thread Size	Dia.	Ht.	For Screw Head Type	Temp. Range, ° F		Each
Six-Arm Grip







				Black Acetal

				1/4"-20	1 1/2"	1/2"	Socket	35 to 180	000000000	00000