Ultra Fine Bolts | McMaster-Carr

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117 Products

Precision-Adjust Stainless Steel Ball-Tip Set Screws

These set screws make the finest adjustments of any we sell. With ultra-fine threads, these screws are found on measuring devices and photonic equipment, where minute adjustments and tight tolerances are critical. They also fine-tune sensors on automated equipment and ensure repeatable positioning on jigs and fixtures. Generally used in dry, controlled environments, the alloy steel tip can oxidize in wet or outdoor environments.

	Lg.	Tip Dia.	Drive Size	Ball Movement	Hardness		Each
18-8 Stainless Steel with Alloy Steel Tip







				6-80

				3/8"	0.094"	5/64"	Fixed	Not Rated	000000000	000000


				7/16"	0.094"	5/64"	Fixed	Not Rated	000000000	00000
				1/2"	0.094"	5/64"	Fixed	Not Rated	000000000	00000
				37/64"	0.094"	5/64"	Fixed	Not Rated	000000000	00000
				3/4"	0.094"	5/64"	Fixed	Not Rated	000000000	00000
				7/8"	0.094"	5/64"	Fixed	Not Rated	000000000	00000
				1"	0.094"	5/64"	Fixed	Not Rated	000000000	00000
				1 1/8"	0.094"	5/64"	Fixed	Not Rated	000000000	00000
				1 1/4"	0.094"	5/64"	Fixed	Not Rated	000000000	00000
				1 1/2"	0.094"	5/64"	Fixed	Not Rated	000000000	00000




						3/16"-100

						3/8"	0.156"	3/32"	Fixed	Not Rated	000000000	0000


						1/2"	0.156"	3/32"	Fixed	Not Rated	000000000	0000
						3/4"	0.156"	3/32"	Fixed	Not Rated	000000000	00000
						1"	0.156"	3/32"	Fixed	Not Rated	000000000	00000
						1 1/4"	0.156"	3/32"	Fixed	Not Rated	000000000	00000
						1 1/2"	0.156"	3/32"	Fixed	Not Rated	000000000	00000
						1 3/4"	0.156"	3/32"	Fixed	Not Rated	000000000	00000
						2"	0.156"	3/32"	Fixed	Not Rated	000000000	00000




								1/4"-80

								3/8"	0.156"	3/32"	Fixed	Not Rated	000000000	00000


								1/2"	0.156"	3/32"	Fixed	Not Rated	000000000	00000
								3/4"	0.156"	3/32"	Fixed	Not Rated	000000000	00000
								1"	0.156"	3/32"	Fixed	Not Rated	000000000	00000
								1 1/4"	0.156"	3/32"	Fixed	Not Rated	000000000	00000
								1 1/2"	0.156"	3/32"	Fixed	Not Rated	000000000	00000
								1 3/4"	0.156"	3/32"	Fixed	Not Rated	000000000	00000
								2"	0.156"	3/32"	Fixed	Not Rated	000000000	00000
								2 1/4"	0.156"	3/32"	Fixed	Not Rated	000000000	00000
								2 1/2"	0.156"	3/32"	Fixed	Not Rated	000000000	00000
								2 3/4"	0.156"	3/32"	Fixed	Not Rated	000000000	00000


								3"	0.156"	3/32"	Fixed	Not Rated	000000000	00000
								3 1/4"	0.156"	3/32"	Fixed	Not Rated	000000000	00000
								3 1/2"	0.156"	3/32"	Fixed	Not Rated	000000000	00000
								3 3/4"	0.156"	3/32"	Fixed	Not Rated	000000000	00000
								4"	0.156"	3/32"	Fixed	Not Rated	000000000	00000




								1/4"-100

		3/8"						0.156"	3/32"	Fixed	Not Rated	000000000	00000


		1/2"	0.156"					3/32"	Fixed	Not Rated	000000000	00000
		3/4"	0.156"					3/32"	Fixed	Not Rated	000000000	00000
		1"	0.156"					3/32"	Fixed	Not Rated	000000000	00000
		1 1/4"	0.156"					3/32"	Fixed	Not Rated	000000000	00000
		1 1/2"	0.156"					3/32"	Fixed	Not Rated	000000000	00000
		1 3/4"	0.156"					3/32"	Fixed	Not Rated	000000000	00000
		2"	0.156"					3/32"	Fixed	Not Rated	000000000	00000
		2 1/4"	0.156"					3/32"	Fixed	Not Rated	000000000	00000
		2 1/2"	0.156"					3/32"	Fixed	Not Rated	000000000	00000
		2 3/4"	0.156"					3/32"	Fixed	Not Rated	000000000	00000


		3"	0.156"					3/32"	Fixed	Not Rated	000000000	00000
		3 1/4"	0.156"					3/32"	Fixed	Not Rated	000000000	00000
		3 1/2"	0.156"					3/32"	Fixed	Not Rated	000000000	00000
		3 3/4"	0.156"	3/32"				Fixed	Not Rated	000000000	00000
		4"	0.156"	3/32"	Fixed			Not Rated	000000000	00000




				M2.5 × 0.2 mm

				8 mm	1.5 mm			1.5 mm	Fixed	Not Rated	000000000	00000


				10 mm	1.5 mm			1.5 mm	Fixed	Not Rated	000000000	00000
				12 mm	1.5 mm			1.5 mm	Fixed	Not Rated	000000000	00000
				15 mm	1.5 mm			1.5 mm	Fixed	Not Rated	000000000	00000
				20 mm	1.5 mm			1.5 mm	Fixed	Not Rated	000000000	00000
				25 mm	1.5 mm			1.5 mm	Fixed	Not Rated	000000000	00000




						M3 × 0.2 mm

						8 mm	1.6 mm	1.5 mm	Fixed	Not Rated	000000000	00000


						10 mm	1.6 mm	1.5 mm	Fixed	Not Rated	000000000	00000
						12 mm	1.6 mm	1.5 mm	Fixed	Not Rated	000000000	00000
						15 mm	1.6 mm	1.5 mm	Fixed	Not Rated	000000000	00000
						20 mm	1.6 mm	1.5 mm	Fixed	Not Rated	000000000	00000
						25 mm	1.6 mm	1.5 mm	Fixed	Not Rated	000000000	00000
						30 mm	1.6 mm	1.5 mm	Fixed	Not Rated	000000000	00000
						33 mm	1.6 mm	1.5 mm	Fixed	Not Rated	000000000	00000
						36 mm	1.6 mm	1.5 mm	Fixed	Not Rated	000000000	00000
						39 mm	1.6 mm	1.5 mm	Fixed	Not Rated	000000000	00000




								M3 × 0.25 mm

								8 mm	1.6 mm	1.5 mm	Fixed	Not Rated	000000000	00000


10 mm	1.6 mm							1.5 mm	Fixed	Not Rated	000000000	00000
12 mm	1.6 mm							1.5 mm	Fixed	Not Rated	000000000	00000
15 mm	1.6 mm							1.5 mm	Fixed	Not Rated	000000000	00000
20 mm	1.6 mm							1.5 mm	Fixed	Not Rated	000000000	00000
25 mm	1.6 mm							1.5 mm	Fixed	Not Rated	000000000	00000
30 mm	1.6 mm							1.5 mm	Fixed	Not Rated	000000000	00000
33 mm	1.6 mm							1.5 mm	Fixed	Not Rated	000000000	00000
36 mm	1.6 mm							1.5 mm	Fixed	Not Rated	000000000	00000
39 mm	1.6 mm							1.5 mm	Fixed	Not Rated	000000000	00000

Threaded Inserts

Install these inserts with ultra-fine threads into unthreaded holes to create a secure mounting point for your precision-adjust set screws.

		Flange
	Installed Lg.	Dia.	Thk.	For Max. Hole Dia.	Drill Bit Size		Each
Brass







				6-80

				1/4"	1/4"	0.03"	7/32"	7/32"	000000000	00000


				3/8"	1/4"	0.03"	7/32"	7/32"	000000000	0000




						3/16"-100

						5/16"	0.29"	0.01"	1/4"	1/4"	000000000	0000


						7/16"	0.29"	0.01"	1/4"	1/4"	000000000	0000
						5/8"	0.29"	0.01"	1/4"	1/4"	000000000	0000
						3/4"	0.29"	0.01"	1/4"	1/4"	000000000	0000




								1/4"-80

								5/16"	0.352"	0.01"	5/16"	5/16"	000000000	0000


								7/16"	0.352"	0.01"	5/16"	5/16"	000000000	0000
								5/8"	0.352"	0.01"	5/16"	5/16"	000000000	0000
								3/4"	0.352"	0.01"	5/16"	5/16"	000000000	0000




										1/4"-100

										5/16"	0.352"	0.01"	5/16"	5/16"	000000000	0000


										7/16"	0.352"	0.01"	5/16"	5/16"	000000000	0000
										5/8"	0.352"	0.01"	5/16"	5/16"	000000000	0000
										3/4"	0.352"	0.01"	5/16"	5/16"	000000000	0000




												M2.5 × 0.2 mm

												7 mm	4.5 mm	0.5 mm	4 mm	4 mm	000000000	0000




														M3 × 0.2 mm

														5 mm	4.95 mm	0.25 mm	4.5 mm	4.5 mm	000000000	0000


7 mm	4.95 mm													0.25 mm	4.5 mm	4.5 mm	000000000	0000
9 mm	4.95 mm													0.25 mm	4.5 mm	4.5 mm	000000000	0000




		M3 × 0.25 mm

		5 mm	4.95 mm											0.25 mm	4.5 mm	4.5 mm	000000000	0000


		7 mm	4.95 mm											0.25 mm	4.5 mm	4.5 mm	000000000	0000
		9 mm	4.95 mm											0.25 mm	4.5 mm	4.5 mm	000000000	0000

Precision-Adjust Ball-Tip Thumb Screws

Make precise adjustments where tight tolerances are critical. With ultra-fine threads, these thumb screws are often found on measuring devices and photonic equipment. The rolling ball tip maintains contact and swivels 360° so you can make adjustments without loosening the screw. The narrow width of the head allows these thumb screws to fit in spaces with limited clearance. The knurled texture creates extra grip as you twist. 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.	Color	Tip Dia.	Threading	Tensile Strength, psi		Each
18-8 Stainless Steel with Acetal Head







				3/16"-100

				3/4"	3/8"	7/16"	Black	1/8"	Fully Threaded	60,000	000000000	000000


				1"	3/8"	7/16"	Black	1/8"	Fully Threaded	60,000	000000000	00000
				1 1/4"	3/8"	7/16"	Black	1/8"	Fully Threaded	60,000	000000000	00000
				1 1/2"	3/8"	7/16"	Black	1/8"	Fully Threaded	60,000	000000000	00000
				1 3/4"	3/8"	7/16"	Black	1/8"	Fully Threaded	60,000	000000000	00000




						1/4"-80

						3/4"	1/2"	3/4"	Black	3/16"	Fully Threaded	60,000	000000000	00000


						1"	1/2"	3/4"	Black	3/16"	Fully Threaded	60,000	000000000	0000
						1 1/4"	1/2"	3/4"	Black	3/16"	Fully Threaded	60,000	000000000	0000
						1 1/2"	1/2"	3/4"	Black	3/16"	Fully Threaded	60,000	000000000	0000
						2"	1/2"	3/4"	Black	3/16"	Fully Threaded	60,000	000000000	00000
						3"	1/2"	3/4"	Black	3/16"	Fully Threaded	60,000	000000000	00000
						3 1/2"	1/2"	3/4"	Black	3/16"	Fully Threaded	60,000	000000000	00000

Threaded Inserts

Install in unthreaded holes to create a secure mounting point for your precision-adjust thumb screws.

		Flange
	Installed Lg.	Dia.	Thk.	For Max. Hole Dia.	Drill Bit Size		Each
Brass







				3/16"-100

				5/16"	0.29"	0.01"	1/4"	1/4"	000000000	00000


				7/16"	0.29"	0.01"	1/4"	1/4"	000000000	0000
				5/8"	0.29"	0.01"	1/4"	1/4"	000000000	0000
				3/4"	0.29"	0.01"	1/4"	1/4"	000000000	0000




						1/4"-80

						5/16"	0.352"	0.01"	5/16"	5/16"	000000000	0000


						7/16"	0.352"	0.01"	5/16"	5/16"	000000000	0000
						5/8"	0.352"	0.01"	5/16"	5/16"	000000000	0000
						3/4"	0.352"	0.01"	5/16"	5/16"	000000000	0000

Threaded Rods

Anchor, connect, or hang components in a wide variety of applications, from mounting I-beams to suspending light fixtures.

Stainless Steel

More corrosion resistant than steel rods and comparable in strength to low-strength steel.

18-8 Stainless Steel—The choice for wet and outdoor environments, these rods resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

	Pkg. Qty.		Pkg.
18-8 Stainless Steel







	1"-14

	4"	70,000	Rockwell B70	1	000000000	000000


	6"	70,000	Rockwell B70	1	000000000	00000
	8"	70,000	Rockwell B70	1	000000000	00000
	1 ft.	70,000	Rockwell B70	1	000000000	00000
	2 ft.	70,000	Rockwell B70	1	000000000	00000
	3 ft.	70,000	Rockwell B70	1	000000000	000000
	4 ft.	70,000	Rockwell B70	1	000000000	00000
	6 ft.	70,000	Rockwell B70	1	000000000	000000