4-40 Hex Head Screws (HHS)

#4-40 Hex Head Screws

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

Quantity

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

Quantity

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

Quantity

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

Quantity

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.