What is the seal screw

Sealing screw is marked with a screw products, what is the seal screw some basic characteristics
Sealing screws standard types: GB cargo seal
Standard Number: GB65-85
Category: screw
Sealing screw head types: cylinder head
Sealing screw Groove: Cross
Mode of action: Fingertight
Applications: Mechanical fasteners for industrial use
Sealing screw thread size: universal
Nominal length: General (mm)
Sealing screw thread tolerance: 4h
Surface treatment: galvanized
Sealing screw Material grade: carbon steel Q235
Sealing Screws Product Grade: A Grade
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