Engineering Data/FAQs

Flange Types

Flat Face

Unconfined Gasket Flat Face
  • Mating faces of both flanges are flat

  • Gasket may be ring type, or full face, which covers the entire face both inside and outside the bolts

Raised Face

Unconfined Gasket Raised Face
  • Mating face is flat, but the area inside the bolt holes is raised 1/16" or 1/4"

  • Gasket is usually ring type, entirely within bolts

  • Flanges may be disassembled easily without springing the flange

Ring Joint

Also Called "API Joint" Ring Joint
  • Both flange faces have matching flat-bottomed grooves with sides tapered from the vertical at 23º

  • Gasket seats on flat section of flange between bore and ring joint groove

  • Garlock spiral wound gaskets can replace solid metal ring gaskets


Semi-Confined Gasket Male-Female
  • Depth of female (recessed) face normally equal to or less than height of male (raised) face, to prevent metal-to-metal contact during gasket compression

  • Recessed O.D. normally is not more than 1/16" larger than the O.D. of the male face

  • Joint must be pried apart for disassembly

Tongue and Groove

Fully Confined Gasket Tongue and Groove
  • Groove depth is equal to or less than tongue height

  • Groove usually not over 1/16" wider than tongue

  • Gasket dimensions will match tongue dimensions

  • Joint must be pried apart for disassembly

Groove to Flat

Fully Confined Gasket Groove to Flat
  • One flange face is flat, the other is recessed

  • For applications requiring accurate control of gasket compression

  • Only resilient gaskets are recommended —spiral wound, hollow metal O-ring, pressure-actuated, and metal-jacketed gaskets

Properties/application shown here are typical. Your specific application should not be undertaken without independent study and evaluation for suitability. For specific application recommendations consult Garlock. Failure to select the proper sealing products could result in property damage and/or serious personal injury.

Performance data published here has been developed from field testing, customer field reports and/or in-house testing.

While the utmost care has been used in compiling this information, we assume no responsibility for errors. Specifications subject to change without notice. This edition cancels all previous issues. Subject to change without notice.

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