An engineered high temperature resistant steelButton Head

  • Excellent high temperature stability
  • Very oxidation and carburization resistant to 2100°F
  • Good resistance to thermal shock and quenching
  • Alloy 330 vented screw features and benefits

Alloy 330 vented screws are specifically designed for high temperature furnace applications. Alloy 330 screws unique combination of properties allow 330 screws to handle thermal shock from quenching, be oxidation and carburization resistant as well as handle thermal cycling well.  As a result, alloy 330 vented screws are found in high temperature applications like vacuum furnaces, heat treating and brazing applications. 

Resources: Alloy 330 Torque Specs

Alloy 330 Screw TypesButton Head Cap ScrewsFlat Head ScrewsHex Cap ScrewsPan Head ScrewsSet ScrewsSocket Head Cap ScrewsTorx Screws


Alloy 330 Vented Screw Features & Benefits

Alloy 330 vented screws are ideal for use in high vacuum (UV) and ultra high vacuum (UHV) equipment, as well as other high pressure environments and applications where gas pockets can form. Center vented screws have a center bore drilled through their axis from the head through the threaded shank of the screw. This feature provides an outlet for the complete evacuation of trapped air and gas contaminants to be pumped away from blind-tapped screw holes, bottoms, sides and shoulders. In addition to vented screws, washers with vent grooves can be made to ensure the venting of the cavity found under the screw head.

Alloy 330 Vented Screws Benefits
•   Enables faster, more efficient pump-down of HV & UHV systems
•   Eliminates virtual leaksVented Screw TextCrop
•   Relieves pressure from blocked gases
•   Provides means to vent contaminants found in screw voids
•   Promotes higher system throughput and improved yield
•   Allows for constant pressure and temperature equalization

Alloy 330 Vented Screws Are Available In:
•  Socket Head Cap Screw
•  Hex Head Cap Screw

vented washer

What is a vented washer?
When a screw is tightened over a flat washer, or directly an application without a washer, volumes of gas can be trapped in the space and beneath the fastener head along the screw shaft. Vented washers feature two bored canals on opposite sides of the flat face which provide an escape route for trapped gases.  

What is a virtual leak?
A virtual leak is comprised of gases that are trapped physically within a pocket with only a miniscule escape path from the trapped pocket of gas into the chamber proper.


330 Tensile Curve

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