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	98625A400	000000


				7/16"	0.094"	5/64"	Fixed	Not Rated	98625A404	00000
				1/2"	0.094"	5/64"	Fixed	Not Rated	98625A406	00000
				37/64"	0.094"	5/64"	Fixed	Not Rated	98625A409	00000
				3/4"	0.094"	5/64"	Fixed	Not Rated	98625A411	00000
				7/8"	0.094"	5/64"	Fixed	Not Rated	98625A415	00000
				1"	0.094"	5/64"	Fixed	Not Rated	98625A420	00000
				1 1/8"	0.094"	5/64"	Fixed	Not Rated	98625A425	00000
				1 1/4"	0.094"	5/64"	Fixed	Not Rated	98625A427	00000
				1 1/2"	0.094"	5/64"	Fixed	Not Rated	98625A436	00000




						3/16"-100

						3/8"	0.156"	3/32"	Fixed	Not Rated	98625A110	0000


						1/2"	0.156"	3/32"	Fixed	Not Rated	98625A130	0000
						3/4"	0.156"	3/32"	Fixed	Not Rated	98625A160	00000
						1"	0.156"	3/32"	Fixed	Not Rated	98625A190	00000
						1 1/4"	0.156"	3/32"	Fixed	Not Rated	98625A220	00000
						1 1/2"	0.156"	3/32"	Fixed	Not Rated	98625A230	00000
						1 3/4"	0.156"	3/32"	Fixed	Not Rated	98625A250	00000
						2"	0.156"	3/32"	Fixed	Not Rated	98625A280	00000




								1/4"-80

								3/8"	0.156"	3/32"	Fixed	Not Rated	98625A620	00000


								1/2"	0.156"	3/32"	Fixed	Not Rated	98625A650	00000
								3/4"	0.156"	3/32"	Fixed	Not Rated	98625A680	00000
								1"	0.156"	3/32"	Fixed	Not Rated	98625A710	00000
								1 1/4"	0.156"	3/32"	Fixed	Not Rated	98625A740	00000
								1 1/2"	0.156"	3/32"	Fixed	Not Rated	98625A750	00000
								1 3/4"	0.156"	3/32"	Fixed	Not Rated	98625A770	00000
								2"	0.156"	3/32"	Fixed	Not Rated	98625A800	00000
								2 1/4"	0.156"	3/32"	Fixed	Not Rated	98625A100	00000
								2 1/2"	0.156"	3/32"	Fixed	Not Rated	98625A108	00000
								2 3/4"	0.156"	3/32"	Fixed	Not Rated	98625A120	00000


								3"	0.156"	3/32"	Fixed	Not Rated	98625A125	00000
								3 1/4"	0.156"	3/32"	Fixed	Not Rated	98625A128	00000
								3 1/2"	0.156"	3/32"	Fixed	Not Rated	98625A143	00000
								3 3/4"	0.156"	3/32"	Fixed	Not Rated	98625A161	00000
								4"	0.156"	3/32"	Fixed	Not Rated	98625A169	00000




								1/4"-100

		3/8"						0.156"	3/32"	Fixed	Not Rated	98625A172	00000


		1/2"	0.156"					3/32"	Fixed	Not Rated	98625A185	00000
		3/4"	0.156"					3/32"	Fixed	Not Rated	98625A195	00000
		1"	0.156"					3/32"	Fixed	Not Rated	98625A200	00000
		1 1/4"	0.156"					3/32"	Fixed	Not Rated	98625A223	00000
		1 1/2"	0.156"					3/32"	Fixed	Not Rated	98625A249	00000
		1 3/4"	0.156"					3/32"	Fixed	Not Rated	98625A301	00000
		2"	0.156"					3/32"	Fixed	Not Rated	98625A344	00000
		2 1/4"	0.156"					3/32"	Fixed	Not Rated	98625A349	00000
		2 1/2"	0.156"					3/32"	Fixed	Not Rated	98625A351	00000
		2 3/4"	0.156"					3/32"	Fixed	Not Rated	98625A356	00000


		3"	0.156"					3/32"	Fixed	Not Rated	98625A360	00000
		3 1/4"	0.156"					3/32"	Fixed	Not Rated	98625A361	00000
		3 1/2"	0.156"					3/32"	Fixed	Not Rated	98625A364	00000
		3 3/4"	0.156"	3/32"				Fixed	Not Rated	98625A376	00000
		4"	0.156"	3/32"	Fixed			Not Rated	98625A391	00000




				M2.5 × 0.2 mm

				8 mm	1.5 mm			1.5 mm	Fixed	Not Rated	98625A455	00000


				10 mm	1.5 mm			1.5 mm	Fixed	Not Rated	98625A485	00000
				12 mm	1.5 mm			1.5 mm	Fixed	Not Rated	98625A498	00000
				15 mm	1.5 mm			1.5 mm	Fixed	Not Rated	98625A503	00000
				20 mm	1.5 mm			1.5 mm	Fixed	Not Rated	98625A504	00000
				25 mm	1.5 mm			1.5 mm	Fixed	Not Rated	98625A507	00000




						M3 × 0.2 mm

						8 mm	1.6 mm	1.5 mm	Fixed	Not Rated	98625A546	00000


						10 mm	1.6 mm	1.5 mm	Fixed	Not Rated	98625A547	00000
						12 mm	1.6 mm	1.5 mm	Fixed	Not Rated	98625A553	00000
						15 mm	1.6 mm	1.5 mm	Fixed	Not Rated	98625A563	00000
						20 mm	1.6 mm	1.5 mm	Fixed	Not Rated	98625A565	00000
						25 mm	1.6 mm	1.5 mm	Fixed	Not Rated	98625A568	00000
						30 mm	1.6 mm	1.5 mm	Fixed	Not Rated	98625A569	00000
						33 mm	1.6 mm	1.5 mm	Fixed	Not Rated	98625A570	00000
						36 mm	1.6 mm	1.5 mm	Fixed	Not Rated	98625A580	00000
						39 mm	1.6 mm	1.5 mm	Fixed	Not Rated	98625A581	00000




								M3 × 0.25 mm

								8 mm	1.6 mm	1.5 mm	Fixed	Not Rated	98625A511	00000


10 mm	1.6 mm							1.5 mm	Fixed	Not Rated	98625A515	00000
12 mm	1.6 mm							1.5 mm	Fixed	Not Rated	98625A518	00000
15 mm	1.6 mm							1.5 mm	Fixed	Not Rated	98625A527	00000
20 mm	1.6 mm							1.5 mm	Fixed	Not Rated	98625A528	00000
25 mm	1.6 mm							1.5 mm	Fixed	Not Rated	98625A529	00000
30 mm	1.6 mm							1.5 mm	Fixed	Not Rated	98625A541	00000
33 mm	1.6 mm							1.5 mm	Fixed	Not Rated	98625A543	00000
36 mm	1.6 mm							1.5 mm	Fixed	Not Rated	98625A544	00000
39 mm	1.6 mm							1.5 mm	Fixed	Not Rated	98625A545	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

				0.250"	1/4"	0.03"	0.219"	7/32"	98625A624	00000


				0.375"	1/4"	0.03"	0.219"	7/32"	98625A847	0000




						3/16"-100

						0.313"	0.29"	0.01"	0.250"	1/4"	98625A320	0000


						0.438"	0.29"	0.01"	0.250"	1/4"	98625A330	0000
						0.625"	0.29"	0.01"	0.250"	1/4"	98625A340	0000
						0.750"	0.29"	0.01"	0.250"	1/4"	98625A350	0000




								1/4"-80

								0.313"	0.352"	0.01"	0.313"	5/16"	98625A950	0000


								0.438"	0.352"	0.01"	0.313"	5/16"	98625A960	0000
								0.625"	0.352"	0.01"	0.313"	5/16"	98625A970	0000
								0.750"	0.352"	0.01"	0.313"	5/16"	98625A980	0000




										1/4"-100

										0.313"	0.352"	0.01"	0.313"	5/16"	98625A586	0000


										0.438"	0.352"	0.01"	0.313"	5/16"	98625A591	0000
										0.625"	0.352"	0.01"	0.313"	5/16"	98625A599	0000
										0.750"	0.352"	0.01"	0.313"	5/16"	98625A602	0000




												M2.5 × 0.2 mm

												7 mm	4.5 mm	0.5 mm	4 mm	4 mm	98625A848	0000




														M3 × 0.2 mm

														5 mm	4.95 mm	0.25 mm	4.5 mm	4.5 mm	98625A879	0000


7 mm	4.95 mm													0.25 mm	4.5 mm	4.5 mm	98625A892	0000
9 mm	4.95 mm													0.25 mm	4.5 mm	4.5 mm	98625A965	0000




		M3 × 0.25 mm

		5 mm	4.95 mm											0.25 mm	4.5 mm	4.5 mm	98625A849	0000


		7 mm	4.95 mm											0.25 mm	4.5 mm	4.5 mm	98625A852	0000
		9 mm	4.95 mm											0.25 mm	4.5 mm	4.5 mm	98625A858	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	97424A110	000000


				1"	3/8"	7/16"	Black	1/8"	Fully Threaded	60,000	97424A140	00000
				1 1/4"	3/8"	7/16"	Black	1/8"	Fully Threaded	60,000	97424A170	00000
				1 1/2"	3/8"	7/16"	Black	1/8"	Fully Threaded	60,000	97424A200	00000
				1 3/4"	3/8"	7/16"	Black	1/8"	Fully Threaded	60,000	97424A230	00000




						1/4"-80

						3/4"	1/2"	3/4"	Black	3/16"	Fully Threaded	60,000	97424A560	00000


						1"	1/2"	3/4"	Black	3/16"	Fully Threaded	60,000	97424A590	0000
						1 1/4"	1/2"	3/4"	Black	3/16"	Fully Threaded	60,000	97424A620	0000
						1 1/2"	1/2"	3/4"	Black	3/16"	Fully Threaded	60,000	97424A650	00000
						2"	1/2"	3/4"	Black	3/16"	Fully Threaded	60,000	97424A680	00000
						3"	1/2"	3/4"	Black	3/16"	Fully Threaded	60,000	97424A740	00000
						3 1/2"	1/2"	3/4"	Black	3/16"	Fully Threaded	60,000	97424A770	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

				0.313"	0.29"	0.01"	0.250"	1/4"	98625A320	00000


				0.438"	0.29"	0.01"	0.250"	1/4"	98625A330	0000
				0.625"	0.29"	0.01"	0.250"	1/4"	98625A340	0000
				0.750"	0.29"	0.01"	0.250"	1/4"	98625A350	0000




						1/4"-80

						0.313"	0.352"	0.01"	0.313"	5/16"	98625A950	0000


						0.438"	0.352"	0.01"	0.313"	5/16"	98625A960	0000
						0.625"	0.352"	0.01"	0.313"	5/16"	98625A970	0000
						0.750"	0.352"	0.01"	0.313"	5/16"	98625A980	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	95412A358	000000


	6"	70,000	Rockwell B70	1	95412A359	00000
	8"	70,000	Rockwell B70	1	95412A104	00000
	1 ft.	70,000	Rockwell B70	1	98804A519	00000
	2 ft.	70,000	Rockwell B70	1	98805A038	00000
	3 ft.	70,000	Rockwell B70	1	98848A038	000000
	4 ft.	70,000	Rockwell B70	1	95412A105	000000
	6 ft.	70,000	Rockwell B70	1	98921A038	000000