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You are here: Home > Piston Rings > Probe Piston Rings > File Fit


The main advantage of a file fit piston ring is that it promotes a better combustion seal by setting exact tolerances, which helps to reduce blow-by and, more importantly, prevents the rings from butting up against one another and scoring the cylinder walls.
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Probe Piston Rings
Probe - AP Steel Ring Set - 3.552 - 1.2 1.5 3.0 - File Fit

P/N: 1412-40000
  • AP Steel Top Ring
  • Cast Second Ring
  • Standard Tension Oil
  • 3.552 Base Bore
  • 8 Cylinder Set
Available Bore Sizes: 3.552, 3.572, 3.582
Probe Piston Rings
Probe Gas-Nitrided AP Steel Ring Set - 3.552 - 1.2 1.2 3.0 - File Fit

P/N: 1414-40010
  • AP Steel Top Ring (Nitrided)
  • Cast Second Ring
  • Standard Tension Oil
  • 3.552 Base Bore
  • +.005 File Fit
  • 8 Cylinder Set
Available Bore Sizes: 3.552, 3.572, 3.582
Probe Piston Rings
Probe Gas-Nitrided Stainless Steel Moly Ring Set - 4.000 - 1.2 1.2 3.0 - File Fit

P/N: 1411-20002
  • Stainless Steel Moly Top Ring (Nitrided)
  • Napier Second Ring (Martensitic)
  • Standard Tension Oil (Flex-Vent)
  • 4.000 Base Bore
  • +.005 File Fit
  • 8 Cylinder Set
Available Bore Sizes: 4.005, 4.025, 4.035, 4.045, 4.055, 4.065
Probe Piston Rings
Probe Gas-Nitrided Stainless Steel Ring Set - 3.630 - 1.2 1.5 3.0 - File Fit

P/N: 1412-40001
  • AP Steel Top Ring
  • Cast Second Ring
  • Standard Tension Oil
  • 3.630 Base Bore
  • 8 Cylinder Set
Available Bore Sizes: 3.630, 3.650
Probe Piston Rings
Probe Gas-Nitrided Stainless Steel Ring Set - 3.780 - 1.5 1.5 3.0 - File Fit

P/N: 1413-10000
  • Stainless Steel Top Ring (Nitrided)
  • Napier Second Ring (Martensitic)
  • Standard Tension Oil (Flex-Vent)
  • 3.780 Base Bore
  • +.005 File Fit
  • 8 Cylinder Set
Available Bore Sizes: 3.780, 3.810, 3.820, 3.840
Probe Piston Rings
Probe Gas-Nitrided Stainless Steel Ring Set - 4.000 - 1.2 1.5 3.0 - File Fit

P/N: 1412-30002
  • Stainless Steel Top Ring (Nitrided)
  • Napier Second Ring (Martensitic)
  • Standard Tension Oil (Flex-Vent)
  • 4.000 Base Bore
  • +.005 File Fit
  • 8 Cylinder Set
Available Bore Sizes: 4.005, 4.020, 4.030, 4.040, 4.050, 4.060
Probe Piston Rings
Probe Gas-Nitrided Stainless Steel Ring Set - 4.000 - 1.5 1.5 3.0 - File Fit

P/N: 1413-10003
  • Stainless Steel Top Ring (Nitrided)
  • Napier Second Ring (Martensitic)
  • Standard Tension Oil (Flex-Vent)
  • 4.000 Base Bore
  • Pre Fit
  • 8 Cylinder Set
Available Bore Sizes: 4.000, 4.020, 4.030, 4.040, 4.050, 4.060
Probe Piston Rings
Probe Gas-Nitrided Steel Ring Set - 4.000 - 1.5 1.5 3.0 - File Fit

P/N: 1410-10002
  • Steel Top Ring
  • Standard Tension Oil (11 lb)
  • 4.000 Base Bore
  • +.005 File Fit
  • 8 Cylinder Set
Available Bore Sizes: 4.005, 4.035, 4.045