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Threaded Closures

Posted in Pipeline Products & Equipment

S-500 Threaded Quick Opening Closures

The Stark S-500 Threaded Closure represents historically the most widely used closure style in the oil and gas sector. Based on the industry desire for robust and cost-effective solutions, Stark improved upon the industry standard design to bring operation to a new level. Features to avoid hammering and strengthen operator control were incorporated into the otherwise proven design. The S-500 is manufactured in diameters ranging from 2” to 52” (DN50 to DN1300) and pressure series 150 through 1500.


• Proven and robust design

• Economically priced

• Certified to ASME B31.3/B31.4/B31.8/CSA Z662 Cat. I

• Flat sealing surface for best seal results on all sizes 

• Bidirectional Hinge design allows the cap to open to left and right side



• 2” to 4” (DN50 to DN100) closures designed for wrench opening

• Opening tool supplied with 6” to 52” (DN150 to DN1300) closures 

• PAV per UG-35.2 of ASME BPVC VIII Div. 1 on 6” and larger (2” to 4” optional) 

• Cap designed per ASME BPVC VIII Div. 1, U-Stamp compliant 

• Nace MR0175 compliant material

• -50° to + 400°F (-45° to 204°C)



• Flanged Closure - welded connection or one piece

• ASME BPVC VIII Div. 1 with U-Stamp for whole closure (cap and hub)

• Opening Wrench for 2” to 4” (DN50 to DN100)

• PAV per UG-35.2 of ASME BPVC VIII Div. 1 on 2” to 4” (DN50 to DN100)

• Stainless Steel and Inconel weld overlay on sealing surfaces

• Custom Wall Thickness, vents, and other modifications 

• Special Materials and O-Rings 

• Horizontal, Vertical, or Inclined hinging