Six-Arm Knobs | McMaster-Carr

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For Screw Head Type

Color

Stud Length

Hub Diameter

Hole Diameter

Total Number of Pieces

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Head Height

Fastener Head Type

Hole Shape

Threading

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U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

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Compliant with Exemptions

Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

92 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"	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

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	4273T81	00000	00000


		M8 × 1.25 mm	18	40	15	21	13	Brass	0 to 240	4273T82	0000	0000
		M8 × 1.25 mm	18	50	17	24	15	Brass	0 to 240	4273T84	0000	0000
		M10 × 1.5 mm	18	40	15	21	13	Brass	0 to 240	4273T83	0000	0000
		M10 × 1.5 mm	18	50	17	24	15	Brass	0 to 240	4273T85	0000	0000
		M12 × 1.75 mm	18	50	17	24	15	Brass	0 to 240	4273T86	0000	0000
		M12 × 1.75 mm	25	60	20	28	15	Brass	0 to 240	4273T87	0000	0000
		M16 × 2 mm	25	60	20	28	15	Brass	0 to 240	4273T88	00000	0000
		M16 × 2 mm	25	70	21	32	21	Brass	0 to 240	4273T89	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	91165A880	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	91165A440	000000

Six-Arm Plastic-Head Thumb Screws

These thumb screws have the largest head of any we offer. They're often found on stops, plates, and jigs. The six arms leave extra space to fit your fingers for easy twisting. These thumb screws combine the strength of stainless steel with a lightweight plastic head that won't rust.

Length is measured from under the head.

18-8 Stainless Steel with Acetal Head—With a stainless steel body and an acetal head, these screws resist moisture and are chemical resistant.

		Head
	Lg.	Dia.	Ht.	Temp. Range, ° F	Color	Threading	Tensile Strength	Pkg. Qty.		Pkg.
18-8 Stainless Steel with Acetal Head







				1/4"-20

				3/8"	1 1/2"	15/32"	32 to 180	Black	Fully Threaded	Not Rated	10	91185A801	000000


				1/2"	1 1/2"	15/32"	32 to 180	Black	Fully Threaded	Not Rated	10	91185A803	00000
				5/8"	1 1/2"	15/32"	32 to 180	Black	Fully Threaded	Not Rated	10	91185A805	00000
				3/4"	1 1/2"	15/32"	32 to 180	Black	Fully Threaded	Not Rated	10	91185A807	00000
				7/8"	1 1/2"	15/32"	32 to 180	Black	Fully Threaded	Not Rated	10	91185A809	00000
				1"	1 1/2"	15/32"	32 to 180	Black	Fully Threaded	Not Rated	10	91185A811	00000
				1 1/4"	1 1/2"	15/32"	32 to 180	Black	Fully Threaded	Not Rated	10	91185A813	00000
				1 1/2"	1 1/2"	15/32"	32 to 180	Black	Partially Threaded	Not Rated	10	91185A815	00000
				1 3/4"	1 1/2"	15/32"	32 to 180	Black	Partially Threaded	Not Rated	5	91185A817	0000
				2"	1 1/2"	15/32"	32 to 180	Black	Partially Threaded	Not Rated	5	91185A819	0000




						1/4"-28

						3/8"	1 1/2"	15/32"	32 to 180	Black	Fully Threaded	Not Rated	10	91185A821	00000


						1/2"	1 1/2"	15/32"	32 to 180	Black	Fully Threaded	Not Rated	10	91185A823	00000
						5/8"	1 1/2"	15/32"	32 to 180	Black	Fully Threaded	Not Rated	10	91185A825	00000
						3/4"	1 1/2"	15/32"	32 to 180	Black	Fully Threaded	Not Rated	10	91185A827	00000
						7/8"	1 1/2"	15/32"	32 to 180	Black	Fully Threaded	Not Rated	10	91185A829	00000
						1"	1 1/2"	15/32"	32 to 180	Black	Fully Threaded	Not Rated	10	91185A831	00000
						1 1/4"	1 1/2"	15/32"	32 to 180	Black	Fully Threaded	Not Rated	10	91185A833	00000




								5/16"-18

								1/2"	1 1/2"	13/32"	32 to 180	Black	Fully Threaded	Not Rated	10	91185A835	00000


								5/8"	1 1/2"	13/32"	32 to 180	Black	Fully Threaded	Not Rated	5	91185A837	0000
								3/4"	1 1/2"	13/32"	32 to 180	Black	Fully Threaded	Not Rated	5	91185A839	0000
								7/8"	1 1/2"	13/32"	32 to 180	Black	Fully Threaded	Not Rated	5	91185A841	0000
								1"	1 1/2"	13/32"	32 to 180	Black	Fully Threaded	Not Rated	5	91185A843	0000
								1 1/4"	1 1/2"	13/32"	32 to 180	Black	Fully Threaded	Not Rated	5	91185A845	0000
								1 1/2"	1 1/2"	13/32"	32 to 180	Black	Fully Threaded	Not Rated	5	91185A847	0000




										5/16"-24

										1/2"	1 1/2"	13/32"	32 to 180	Black	Fully Threaded	Not Rated	5	91185A849	0000


										5/8"	1 1/2"	13/32"	32 to 180	Black	Fully Threaded	Not Rated	5	91185A851	0000
										3/4"	1 1/2"	13/32"	32 to 180	Black	Fully Threaded	Not Rated	5	91185A853	00000
										7/8"	1 1/2"	13/32"	32 to 180	Black	Fully Threaded	Not Rated	5	91185A855	0000
										1"	1 1/2"	13/32"	32 to 180	Black	Fully Threaded	Not Rated	5	91185A857	0000
1 1/4"										1 1/2"	13/32"	32 to 180	Black	Fully Threaded	Not Rated	5	91185A859	0000
1 1/2"	1 1/2"									13/32"	32 to 180	Black	Fully Threaded	Not Rated	5	91185A861	0000




		3/8"-16

		3/4"	1 1/2"							15/32"	32 to 180	Black	Fully Threaded	Not Rated	5	91185A863	0000


		7/8"	1 1/2"							15/32"	32 to 180	Black	Fully Threaded	Not Rated	5	91185A865	0000
		1"	1 1/2"							15/32"	32 to 180	Black	Fully Threaded	Not Rated	5	91185A867	0000
		1 1/4"	1 1/2"							15/32"	32 to 180	Black	Fully Threaded	Not Rated	5	91185A869	00000
		1 1/2"	1 1/2"							15/32"	32 to 180	Black	Fully Threaded	Not Rated	5	91185A871	00000




										M6 × 1 mm

										10 mm	38 mm	12.2 mm	32 to 180	Black	Fully Threaded	Not Rated	10	96016A501	00000


				12 mm						38 mm	12.2 mm	32 to 180	Black	Fully Threaded	Not Rated	10	96016A505	00000
				16 mm	38 mm					12.2 mm	32 to 180	Black	Fully Threaded	Not Rated	10	96016A509	00000
				20 mm	38 mm					12.2 mm	32 to 180	Black	Fully Threaded	Not Rated	10	96016A513	00000
				25 mm	38 mm					12.2 mm	32 to 180	Black	Fully Threaded	Not Rated	10	96016A517	00000




										M8 × 1.25 mm

										12 mm	38 mm	10 mm	32 to 180	Black	Fully Threaded	Not Rated	5	96016A602	0000


										16 mm	38 mm	10 mm	32 to 180	Black	Fully Threaded	Not Rated	5	96016A606	0000
										20 mm	38 mm	10 mm	32 to 180	Black	Fully Threaded	Not Rated	5	96016A610	0000
						25 mm				38 mm	10 mm	32 to 180	Black	Fully Threaded	Not Rated	5	96016A614	0000

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	94052A041	00000


		5/16"	1 1/2"	13/32"	35 to 180	Black , Gray , Red , Yellow	10	94052A043	0000
		3/8"	1 1/2"	15/32"	35 to 180	Black , Gray , Red , Yellow	10	94052A046	0000
		M6	38 mm	12.2 mm	35 to 180	Black , Gray , Red , Yellow	10	91175A071	0000
		M8	38 mm	10.4 mm	35 to 180	Black , Gray , Red , Yellow	10	91175A072	0000
		M10	38 mm	12.5 mm	35 to 180	Black , Gray , Red , Yellow	10	91175A073	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"	61515K212	00000	00000


		3/8"-16	3/4"	2"	5/8"	1"	7/8"	61515K222	0000	0000

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"	61515K211	00000	00000


		3/8"	7/8"	2"	9/16"	1"	1"	61515K221	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"	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 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"	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

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	93228A250	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	93228A500	00000