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Spiral Wound Gaskets
Manufacturing Capabilities and Tolerances
Recommended Design Parameters
Gasket Maximum Maximum Recommended
Thickness Inside Recommended Compressed
Dimension Crossectional Width Thickness **
0.0625” Up to 6” 3/8” 0.050” / 0.055”
0.0625” 6” to 15” 1/4” 0.050” / 0.055”
0.100” 10” 1/2” 0.075” / 0.080”
0.125” Up to 20” 1” 0.090” / 0.100”
0.125” * 20” to 40” 3/4” 0.090” / 0.100”
0.175” Up to 40” 1” 0.125” / 0.135”
0.175” * 40” to 60” 1” 0.125” / 0.135”
0.175” * 60” to 70” 7/8” 0.125” / 0.135”
0.175” * 70” to 75” 3/4” 0.125” / 0.135”
0.250” 90” 1” 0.180” / 0.200”
0.285” 185” 1” 0.200” / 0.220”
Preferred size range in relation to thickness shown in bold type.
* PTFE filled FLEXITALLIC gaskets in this size range are unstable and are subject to “springing apart” in shipping and
handling. Specify next gasket thickness up.
** The recommended compressed thickness is what experience has indicated to be the optimum range in order to
achieve maximum resiliency of the gasket. Additional compression of 0.010” may be tolerated on all gasket thicknesses
with the exception of the 0.0625” and the 0.100” thick gaskets. This is on the assumption that the flange surface
finishes are relatively smooth. Refer to “Surface Finish Requirements” on page 46. When attempting to contain
hard to hold fluids, or pressures above 1000 psi, it is suggested that compression be maintained at the lower range of
the recommended compressed thickness.
Tolerances
Gasket Diameter Inside Diameter Outside Diameter
Up to 10” ± 1/64” ± 1/32”
10” to 24” ± 1/32” ± 1/16”
24” to 60” ± 3/64” ± 1/16”
60” & Above ± 1/16” ± 1/16”
Tolerance on gasket thickness is ± 0.005”, (measured across metal winding) on all
thicknesses.
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