Professional factory selling ASTM A193 B7 Combination Studs Step Down Studs Wholesale to Iran
Product Detail
ASTM A193/A193M B7 Combination Studs Step Down Studs
Alloy steel bolting for pressure vessels, valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications.
Standard: According to drawing
Inch Size: 1/4”-4” with various lengths
Metric Size: M6-M100 with various lengths
Other Available Grade:
ASTM A193/A193M B7, B7M, B16 B8 Class 1 & 2, B8M Class 1 & 2,
ASTM A320/A320M L7, L7M, L43, B8 Class 1 & 2, B8M Class 1 & 2, and so on.
Finish: Plain, Black Oxide, Zinc Plated, Zinc Nickel Plated, Cadmium Plated, PTFE etc.
Packing: Bulk about 25 kgs each carton, 36 cartons each pallet
Advantage: High Quality and Strict Quality Control, Competitive Price,Timely Delivery; Technical Support, Supply Test Reports
Please feel free to contact us for more details.
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Professional factory selling ASTM A193 B7 Combination Studs Step Down Studs Wholesale to Iran Related Video:
It has come to my attention that an identical machine has already been conceptualized and patented US patent # 20030012675 A1
It seems everything has already been invented 
Models:
https://docs.google.com/open?id=0Bz85oSr4b0ZAMmIxYzlkZTEtMzExNS00ZTgzLWJmZmItNDVjMWI2NmFkYzNi
The current screw profile is not sealed ie: some leakage can occur from one discrete air pocket to the next, and the current profile would leak. I believe there may be an air tight profile tho, as some more complicated profiles have been used in screw compressors.