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4-40 Hex Head Screws

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210367
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$11.00

Vented #4-40, 18-8 Stainless Steel, Hex Head Screw, 1/4" long. 10 per pack.

$11.00
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210368
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$20.00

Vented #4-40, 18-8 Stainless Steel, Hex Head Screw, 3/8" long. 10 per pack.

$20.00
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210369
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$24.00

Vented #4-40, 18-8 Stainless Steel, Hex Head Screw, 1/2" long. 10 per pack.

$24.00
3/4
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210370
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$18.00

Vented #4-40, 18-8 Stainless Steel, Hex Head Screw, 3/4" long. 2 per pack.

$18.00

4-40 - HHS, Vented Screws

The use of 'Vented' fasteners inside a vacuum environment is critical. A non-vented, blind-threaded hole creates a gas pocket that's difficult or impossible to evacuate (pump down) without an escape path. A trapped gas will manifest it self as a 'virtual leak', which is difficult to locate and causes unwanted downtime. Accu-Glass vented fasteners are manufactured from vacuum compatible 18-8 grade stainless steel.