High-Vacuum Bolts | McMaster-Carr

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30,000 psi to 99,999 psi

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EAR99

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54 Products

Cleaned and Bagged Socket Head Screws for High Vacuum

Install these screws in high-vacuum systems where even a small amount of contamination could affect performance. These are cleaned and double-bagged in an ISO Class 5 (Fed. Std. Class 100) clean room. The deep, six-point socket keeps hex keys from slipping out and damaging the drive.

Length is measured from under the head.

Silver-Plated 18-8 Stainless Steel—18-8 stainless steel screws release gas at a slower rate than other metal screws, so your system can reach higher levels of vacuum. The silver plating helps the screw slide smoothly when tightening or loosening it in the mounting surface.

		Head
	Lg.	Dia.	Ht.	Threading	Thread Spacing	Tensile Strength, psi	Clean Room Std.		Each
Silver-Plated 18-8 Stainless Steel







				4-40

				1/2"	0.183"	0.112"	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90843A110	000000


				3/4"	0.183"	0.112"	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90843A160	00000
				1"	0.183"	0.112"	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90843A210	00000




						6-32

						1/2"	0.226"	0.138"	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90843A120	00000


						3/4"	0.226"	0.138"	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90843A170	00000
						1"	0.226"	0.138"	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90843A220	00000




								8-32

								1/2"	0.27"	0.164"	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90843A130	00000


								3/4"	0.27"	0.164"	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90843A180	00000
								1"	0.27"	0.164"	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90843A230	00000




										10-32

										1/2"	5/16"	0.19"	Fully Threaded	Fine	70,000	Fed. Std. Class 100, ISO Class 5	90843A140	00000


										3/4"	5/16"	0.19"	Fully Threaded	Fine	70,000	Fed. Std. Class 100, ISO Class 5	90843A190	00000
										1"	5/16"	0.19"	Fully Threaded	Fine	70,000	Fed. Std. Class 100, ISO Class 5	90843A240	00000




												1/4"-20

												1/2"	3/8"	1/4"	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90843A150	00000


												3/4"	3/8"	1/4"	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90843A200	00000
												1"	3/8"	1/4"	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90843A250	00000




														M3 × 0.5 mm

8 mm														5.5 mm	3 mm	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90843A260	00000


10 mm	5.5 mm													3 mm	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90843A300	00000
12 mm	5.5 mm													3 mm	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90843A340	00000




		M4 × 0.7 mm

		8 mm	7 mm											4 mm	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90843A270	00000


		10 mm	7 mm											4 mm	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90843A310	00000
		12 mm	7 mm											4 mm	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90843A350	00000




				M5 × 0.8 mm

				8 mm	8.5 mm									5 mm	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90843A280	00000


				10 mm	8.5 mm									5 mm	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90843A320	00000
				12 mm	8.5 mm									5 mm	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90843A360	00000




						M6 × 1 mm

						8 mm	10 mm							6 mm	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90843A290	00000


						10 mm	10 mm							6 mm	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90843A330	00000
						12 mm	10 mm							6 mm	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90843A370	00000

Cleaned and Bagged Venting Socket Head Screws for High Vacuum

Reduce the time it takes to reach vacuum conditions in high-vacuum systems. A vent in these screws allows fluid and gas to escape. Cleaned and double-bagged in an ISO Class 5 (Fed. Std. Class 100) clean room, use them these screws in places where even a small amount of contamination could affect performance. The deep, six-point socket keeps hex keys from slipping out and damaging the drive.

Length is measured from under the head.

18-8 Stainless Steel—Release gas at a slower rate than other metals, allowing your system to achieve higher levels of vacuum.

		Head
	Lg.	Dia.	Ht.	Vent Dia.	Threading	Thread Spacing	Tensile Strength, psi	Clean Room Std.		Each
18-8 Stainless Steel







				4-40

				1/2"	0.183"	0.112"	0.036"	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90841A110	000000


				3/4"	0.183"	0.112"	0.036"	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90841A160	00000
				1"	0.183"	0.112"	0.036"	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90841A210	00000




						6-32

						1/2"	0.226"	0.138"	0.04"	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90841A120	00000


						3/4"	0.226"	0.138"	0.04"	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90841A170	00000
						1"	0.226"	0.138"	0.04"	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90841A220	00000




								8-32

								1/2"	0.27"	0.164"	0.042"	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90841A130	00000


								3/4"	0.27"	0.164"	0.042"	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90841A180	00000
								1"	0.27"	0.164"	0.042"	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90841A230	00000




										10-32

										1/2"	5/16"	0.19"	0.052"	Fully Threaded	Fine	70,000	Fed. Std. Class 100, ISO Class 5	90841A140	00000


										3/4"	5/16"	0.19"	0.052"	Fully Threaded	Fine	70,000	Fed. Std. Class 100, ISO Class 5	90841A190	00000
										1"	5/16"	0.19"	0.052"	Fully Threaded	Fine	70,000	Fed. Std. Class 100, ISO Class 5	90841A240	00000




												1/4"-20

												1/2"	3/8"	1/4"	0.063"	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90841A150	00000


												3/4"	3/8"	1/4"	0.063"	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90841A200	00000
												1"	3/8"	1/4"	0.063"	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90841A250	00000




														M3 × 0.5 mm

8 mm														5.5 mm	3 mm	1 mm	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90841A260	00000


10 mm	5.5 mm													3 mm	1 mm	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90841A300	00000
12 mm	5.5 mm													3 mm	1 mm	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90841A340	00000




		M4 × 0.7 mm

		8 mm	7 mm											4 mm	1.1 mm	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90841A270	00000


		10 mm	7 mm											4 mm	1.1 mm	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90841A310	00000
		12 mm	7 mm											4 mm	1.1 mm	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90841A350	00000




				M5 × 0.8 mm

				8 mm	8.5 mm									5 mm	1.3 mm	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90841A280	00000


				10 mm	8.5 mm									5 mm	1.3 mm	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90841A320	00000
				12 mm	8.5 mm									5 mm	1.3 mm	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90841A360	00000




						M6 × 1 mm

						8 mm	10 mm							6 mm	1.6 mm	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90841A290	00000


						10 mm	10 mm							6 mm	1.6 mm	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90841A330	00000
						12 mm	10 mm							6 mm	1.6 mm	Fully Threaded	Coarse	70,000	Fed. Std. Class 100, ISO Class 5	90841A370	00000