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  Thread Vented Screws  
   
 

What is a Virtual Leak?
Vacuum systems often experience problems known as virtual leaks due to trapped volumes. A virtual leak is a source of gas that is released very slowly inside a vacuum system. A typical source of a virtual leak is a blind tapped hole within the vacuum system. Vented screws can be used to allow the trapped gas to rapidly escape.

How do Thread Vented Screws Help?
Signet thread vented screws are slotted along the threads and into the screw head. This slot along the threads allows the gas to be pumped rapidly from the bottom of the blind tapped hole and the screw threads which results in the avoidance of virtual leaks. The elimination of virtual leaks improves system performance. Signet thread vented screws provide the following benefits:

  • Elimination of Virtual Leaks
  • Retain More Mechanical Strength Compared to Other Venting Methods
  • Vents the Threads as well as the Bottom of the Blind Tapped Hole
  • Thread Venting may be the only way Longer Screws can be Vented

Signet thread vented screws are 18-8 series stainless steel and can be coated with parting agents to reduce galling or seizing. Coating options are molybdenum disulfide and tungsten disulfide. Signet thread vented screws can also be plated with silver. Thread vented screws can also be manufactured with other materials upon request.

The following thread vented screw types are available. Other head types are available upon request. A minimum quantity of 55 each per line item is required. There is more information about our Thread Vented Screws on our Product Data Sheet

  
     
  Vacuum & Coating Magazine article on Impediments to Good Vacuum on page 14 at this link.  
 
 
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Head Type
Description Type Abbrev.
00-xxxx
Milled Slot Across Threads to Vent
00-x0xx
Socket Head Cap
SHC
00-x1xx
Phillips Flat Head
PFH
00-x2xx
Binding Head Slotted
BHS
00-x3xx
Hex Head
HH
00-x4xx
Socket Flat Head
SkFH
00-x5xx
Phillips Pan Head
PPH
00-X6XX
Cup Point Set
CPS
00-x7xx
Button Head
BH
00-x8xx
Slotted Pan Head
SPH
00-x9xx
Slotted Round Head
SRH
00-xAxx
Slotted Flat Head
SFH
00-xBxx
Flat Point Set
FPS
00-xCxx
Slotted Cheese Head bin84a (metric)
SCH
00-xDxx
Slotted Fillister Head
SFH
00-xExx
Slotted Pan Head Self-Sealing (o-ring)
SPH
00-xFxx
Round Head Slotted
RHS
00-xGxx
Socket Set Screw - Cone Point
SSS
00-xHxx
Socket Head Cap Shoulder Screw (xx=L)
SHCSH
   
 
     
 
Copyrights Signet Products, Corp. 2017
  
 		  
 
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0Last update June 15, 2015
    
 
     
 
Signet Products, Corporation
521 Mount Hope Street, Suite 302
North Attleboro, MA 02760
Phone: (650) 592-3575