1/4" SS, #4-40 Vented Hex Head Screw
Part Number: 210367
Vented #4-40, 18-8 Stainless Steel, Hex Head Screw, 1/4" long. 10 per pack.
$12.00
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#4-40 Vented Hex Head Screws
3/8" SS, #4-40 Vented Hex Head Screw
Part Number: 210368
Vented #4-40, 18-8 Stainless Steel, Hex Head Screw, 3/8" long. 10 per pack.
$22.00
1/2" SS, #4-40 Vented Hex Head Screw
Part Number: 210369
Vented #4-40, 18-8 Stainless Steel, Hex Head Screw, 1/2" long. 10 per pack.
$27.00
3/4" SS, #4-40 Vented Hex Head Screw
Part Number: 210370
Vented #4-40, 18-8 Stainless Steel, Hex Head Screw, 3/4" long. 2 per pack.
$20.00
4-40 Hex Head (HHS)
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 4-40 hex head screws are manufactured from vacuum compatible 18-8 grade stainless steel.