Spherical Rest Buttons | McMaster-Carr

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100 Products

Threaded Locating and Support Buttons


	Flat Head

Domed Head

Use these buttons to support and position workpieces and fixtures from the bottom or side. Threading makes these buttons easier to replace than press-fit, so they are a good choice for high-wear applications. They’re also known as rest buttons.

Hardened Heat Treatment—Hardened steel buttons are stronger and resist wear better than steel buttons. They are precision ground, which helps them maintain their shape and size, even with repeated use. This makes them a good choice for use in modular fixtures where repeatability and exact positioning are important.

Domed Head—Buttons with a domed head support rounded or irregularly shaped workpieces with minimal contact.

Hex—Their hex shape lets you screw them into a threaded hole with a wrench or socket.

			Thread
	Lg.	Wd.	Size	Lg.	Lg. Tolerance	Shape	Specs. Met		Each
Steel with Flat Head



		3/16"	1/4"	8-32	3/16"	0" to 0.015"	Hex	—	8479A13	00000


		3/16"	5/16"	10-32	1/4"	0" to 0.015"	Hex	—	8479A14	0000
		3/16"	3/8"	1/4"-28	5/16"	0" to 0.015"	Hex	—	8479A15	0000
		1/4"	3/8"	1/4"-20	3/8"	-0.003" to 0.012"	Hex	—	8479A111	0000
		1/4"	3/8"	1/4"-28	5/16"	0" to 0.015"	Hex	—	8479A11	0000
		1/4"	1/2"	3/8"-16	1/2"	-0.003" to 0.012"	Hex	—	8479A116	0000
		1/4"	1/2"	3/8"-24	7/16"	0" to 0.015"	Hex	—	8479A37	0000
		1/4"	5/8"	1/2"-13	5/8"	-0.003" to 0.012"	Hex	—	8479A122	0000
		1/4"	3/4"	5/8"-11	3/4"	0" to 0.012"	Hex	—	8479A127	0000
		3/8"	3/8"	1/4"-20	3/8"	-0.003" to 0.012"	Hex	—	8479A112	0000
		3/8"	3/8"	1/4"-28	5/16"	0" to 0.015"	Hex	—	8479A12	0000


		3/8"	1/2"	3/8"-16	1/2"	-0.003" to 0.012"	Hex	—	8479A117	0000
		3/8"	1/2"	3/8"-24	7/16"	0" to 0.015"	Hex	—	8479A38	0000
		3/8"	5/8"	1/2"-13	5/8"	-0.003" to 0.012"	Hex	—	8479A123	0000
		3/8"	3/4"	5/8"-11	3/4"	0" to 0.012"	Hex	—	8479A128	0000
		1/2"	3/8"	1/4"-20	3/8"	-0.003" to 0.012"	Hex	—	8479A113	0000
		1/2"	1/2"	3/8"-16	1/2"	-0.003" to 0.012"	Hex	—	8479A118	0000
		1/2"	1/2"	3/8"-24	1/2"	0.005" to 0.015"	Hex	—	8479A4	0000
		1/2"	5/8"	1/2"-13	5/8"	-0.003" to 0.012"	Hex	—	8479A124	0000
		1/2"	5/8"	1/2"-20	1/2"	0.005" to 0.015"	Hex	—	8479A7	0000
		1/2"	3/4"	1/2"-20	9/16"	0" to 0.015"	Hex	—	8479A68	0000


		1/2"	3/4"	5/8"-11	3/4"	0" to 0.012"	Hex	—	8479A129	0000
		3/4"	3/8"	1/4"-20	3/8"	-0.003" to 0.012"	Hex	—	8479A114	0000
		3/4"	3/8"	1/4"-28	3/8"	0.005" to 0.015"	Hex	—	8479A2	0000
		3/4"	1/2"	3/8"-16	1/2"	-0.003" to 0.012"	Hex	—	8479A119	0000
		3/4"	1/2"	3/8"-24	1/2"	0.005" to 0.015"	Hex	—	8479A5	0000
		3/4"	5/8"	1/2"-13	5/8"	-0.003" to 0.012"	Hex	—	8479A125	0000
		3/4"	5/8"	1/2"-20	1/2"	0.005" to 0.015"	Hex	—	8479A8	0000
		3/4"	3/4"	5/8"-11	3/4"	0" to 0.012"	Hex	—	8479A131	0000
		1"	3/8"	1/4"-20	3/8"	-0.003" to 0.012"	Hex	—	8479A115	0000
		1"	3/8"	1/4"-28	3/8"	0.005" to 0.015"	Hex	—	8479A3	0000


		1"	1/2"	3/8"-16	1/2"	-0.003" to 0.012"	Hex	—	8479A121	0000
		1"	1/2"	3/8"-24	1/2"	0.005" to 0.015"	Hex	—	8479A6	0000
		1"	5/8"	1/2"-13	5/8"	-0.003" to 0.012"	Hex	—	8479A126	0000
		1"	5/8"	1/2"-20	1/2"	0.005" to 0.015"	Hex	—	8479A9	0000
		1"	3/4"	5/8"-11	3/4"	0" to 0.012"	Hex	—	8479A132	0000
		10 mm	10 mm	M6 × 1 mm	11 mm	-0.2 mm to 0.2 mm	Hex	DIN 6320	3078N11	0000
		15 mm	13 mm	M8 × 1.25 mm	13 mm	-0.2 mm to 0.2 mm	Hex	DIN 6320	3078N12	0000
		20 mm	17 mm	M10 × 1.5 mm	16 mm	-0.2 mm to 0.2 mm	Hex	DIN 6320	3078N13	0000
		25 mm	19 mm	M12 × 1.75 mm	20 mm	-0.2 mm to 0.2 mm	Hex	DIN 6320	3078N14	0000


		Hardened Steel with Flat Head



				10 mm	17 mm	M8 × 1.25 mm	10 mm	-0.01 mm to 0.01 mm	Hex	—	3078N15	00000


				10 mm	19 mm	M10 × 1.5 mm	12 mm	-0.01 mm to 0.01 mm	Hex	—	3078N16	00000
				10 mm	22 mm	M12 × 1.75 mm	14 mm	-0.01 mm to 0.01 mm	Hex	—	3078N17	00000


Hardened Steel with Domed Head



				10 mm	17 mm	M8 × 1.25 mm	10 mm	-0.1 mm to 0.1 mm	Hex	—	3078N18	00000


				10 mm	19 mm	M10 × 1.5 mm	12 mm	-0.1 mm to 0.1 mm	Hex	—	3078N19	00000
				10 mm	22 mm	M12 × 1.75 mm	14 mm	-0.1 mm to 0.1 mm	Hex	—	3078N21	00000

Press-Fit Locating and Support Buttons

Support and position workpieces and fixtures from the bottom or side. These buttons press into a drilled hole for permanent installation. Also known as rest buttons.

Stainless Steel—Stainless steel buttons are a good choice to avoid corrosion when working with stainless steel workpieces or fixtures.

			Stud		Tolerance
	Dia.	Lg.	Dia.	Lg.	Lg.	Stud Dia.	Specs. Met		Each
Steel



		1/4"	1/8"	1/8"	7/32"	0" to 0.001"	0.001" to 0.0015"	—	8511A17	00000


		1/4"	1/4"	3/16"	7/32"	0.01" to 0.015"	0.0005" to 0.001"	—	8511A11	0000
		3/8"	1/8"	1/8"	7/32"	0" to 0.001"	0.001" to 0.0015"	—	8511A18	0000
		3/8"	1/4"	3/16"	7/32"	0.01" to 0.015"	0.0005" to 0.001"	—	8511A12	0000
		3/8"	1/4"	1/4"	1/2"	0" to 0.001"	0.0005" to 0.001"	—	8511A21	0000
		3/8"	3/8"	3/16"	3/8"	0" to 0.001"	-0.0005" to 0"	—	8511A415	0000
		3/8"	1/2"	3/16"	3/8"	0" to 0.005"	0.0005" to 0.001"	—	8511A23	0000
		1/2"	1/8"	1/8"	7/32"	0" to 0.001"	0.001" to 0.0015"	—	8511A19	0000
		1/2"	1/4"	1/4"	1/2"	0" to 0.005"	0.0005" to 0.0015"	—	8511A24	0000
		1/2"	3/8"	1/4"	1/2"	0" to 0.005"	0.0005" to 0.0015"	—	8511A25	0000
		1/2"	1/2"	1/4"	1/2"	0" to 0.005"	0.0005" to 0.0015"	—	8511A26	0000


		5/8"	1/4"	3/8"	15/32"	0.01" to 0.015"	0.0005" to 0.001"	—	8511A16	0000
		5/8"	5/16"	5/16"	1/2"	0" to 0.001"	-0.0005" to 0"	—	8511A413	0000
		5/8"	3/8"	3/8"	1/2"	0" to 0.005"	0.0005" to 0.0015"	—	8511A28	0000
		5/8"	7/16"	5/16"	1/2"	0" to 0.001"	-0.0005" to 0"	—	8511A418	0000
		5/8"	1/2"	3/8"	1/2"	0" to 0.005"	0.0005" to 0.0015"	—	8511A29	0000
		5/8"	5/8"	3/8"	1/2"	0" to 0.005"	0.0005" to 0.0015"	—	8511A31	0000
		5/8"	3/4"	3/8"	1/2"	0" to 0.005"	0.0005" to 0.0015"	—	8511A32	0000
		5/8"	7/8"	5/16"	1/2"	0" to 0.001"	-0.0005" to 0"	—	8511A433	0000
		5/8"	1"	3/8"	1/2"	0" to 0.005"	0.0005" to 0.0015"	—	8511A33	0000
		3/4"	1 1/2"	1/2"	1/2"	0" to 0.01"	0.0005" to 0.0015"	—	8511A35	0000


		7/8"	1/4"	1/2"	5/8"	0" to 0.001"	-0.0005" to 0"	—	8511A411	0000
		7/8"	5/16"	1/2"	5/8"	0" to 0.001"	-0.0005" to 0"	—	8511A414	0000
		7/8"	3/8"	1/2"	5/8"	0" to 0.001"	-0.0005" to 0"	—	8511A416	00000
		7/8"	7/16"	1/2"	5/8"	0" to 0.001"	-0.0005" to 0"	—	8511A419	0000
		7/8"	1/2"	1/2"	5/8"	0" to 0.001"	-0.0005" to 0"	—	8511A421	0000
		7/8"	9/16"	1/2"	5/8"	0" to 0.001"	-0.0005" to 0"	—	8511A424	0000
		7/8"	5/8"	1/2"	5/8"	0" to 0.001"	-0.0005" to 0"	—	8511A425	0000
		7/8"	11/16"	1/2"	5/8"	0" to 0.001"	-0.0005" to 0"	—	8511A427	0000
		7/8"	3/4"	1/2"	5/8"	0" to 0.001"	-0.0005" to 0"	—	8511A428	0000
		7/8"	13/16"	1/2"	5/8"	0" to 0.001"	-0.0005" to 0"	—	8511A432	0000


		7/8"	7/8"	1/2"	5/8"	0" to 0.001"	-0.0005" to 0"	—	8511A434	0000
		7/8"	15/16"	1/2"	5/8"	0" to 0.001"	-0.0005" to 0"	—	8511A435	00000
		7/8"	1"	1/2"	5/8"	0" to 0.001"	-0.0005" to 0"	—	8511A436	0000
		1"	3/8"	5/8"	3/4"	0" to 0.001"	-0.0005" to 0"	—	8511A417	00000
		1"	1/2"	5/8"	3/4"	0" to 0.001"	-0.0005" to 0"	—	8511A422	00000
		1"	5/8"	5/8"	3/4"	0" to 0.001"	-0.0005" to 0"	—	8511A426	0000
		1"	3/4"	5/8"	3/4"	0" to 0.001"	-0.0005" to 0"	—	8511A429	0000
		1 1/2"	1/4"	1"	1 3/8"	0" to 0.001"	-0.0005" to 0"	—	8511A412	00000
		1 1/2"	1/2"	1"	1 3/8"	0" to 0.001"	-0.0005" to 0"	—	8511A423	00000
		1 1/2"	3/4"	1"	1 3/8"	0" to 0.001"	-0.0005" to 0"	—	8511A431	00000


		1 1/2"	1"	1"	1 3/8"	0" to 0.001"	-0.0005" to 0"	—	8511A437	00000
		6 mm	5 mm	4 mm	6 mm	-0.03 mm to 0 mm	0 mm to 0.02 mm	DIN 6321	3097N11	00000
		10 mm	6 mm	6 mm	9 mm	-0.03 mm to 0 mm	0 mm to 0.02 mm	DIN 6321	3097N12	00000
		16 mm	8 mm	8 mm	12 mm	-0.036 mm to 0 mm	0 mm to 0.04 mm	DIN 6321	3097N13	00000
		25 mm	10 mm	12 mm	18 mm	-0.036 mm to 0 mm	0 mm to 0.04 mm	DIN 6321	3097N14	00000


		Stainless Steel



3/8"	1/4"			3/16"	1/4"	0" to 0.001"	0" to 0.001"	—	8511A111	0000


3/8"	3/8"			3/16"	1/4"	0" to 0.001"	0" to 0.001"	—	8511A112	0000
3/8"	1/2"			3/16"	1/4"	0" to 0.001"	0" to 0.001"	—	8511A113	0000
1/2"	1/4"			1/4"	5/16"	0" to 0.001"	0" to 0.001"	—	8511A114	0000
1/2"	3/8"			1/4"	5/16"	0" to 0.001"	0" to 0.001"	—	8511A115	0000
1/2"	1/2"			5/16"	5/16"	0" to 0.001"	0" to 0.001"	—	8511A116	0000
1/2"	3/4"			5/16"	5/16"	0" to 0.001"	0" to 0.001"	—	8511A117	0000
1/2"	1"			5/16"	5/16"	0" to 0.001"	0" to 0.001"	—	8511A118	0000