Bonding Pressure Calculator
Enter the details of your bonder's ram/piston and the friction ring you are bonding into the calculator here to find the piston pressure required to create the desired pressure at the ring.

Piston Diameter

Inner Diameter

Outer Diameter








Piston Pressure Required:
Minimum Pressure:
Maximum Pressure:


Torque converter clutch material is engineered by the OEMs to operate in conjunction with vehicle computer programming. To meet the varied needs of the aftermarket, Sonnax strives to offer a full line of friction products in a wide variety of sizes and materials. Rebuilders should choose the product that best matches their specific vehicle requirements.
Materials Designed for Slip Converters

HTS - Designed for high-thermal capacity applications. Replaces spun-wound, woven or other carbon-based materials.
WC - Genuine OE woven carbon material developed by OEMs for continuous slip GM and Ford applications.

Materials Designed for Full Lockup Converters

HTE - Thermal capacity of Kevlar®, with improved consistency and shudder resistance.
HTL - High thermal and exceptional torque capacity for the most demanding torque-holding applications.
XTL - 30% More torque holding capacity than HTL. Available only for a small range of extreme-duty lockup applications.
Learn more about Friction Rings

More From This Category

Cast Piston

Cast Piston

$100.64

KB Piston, 4 in. Bore, For Ford 302 Rod 5.090 Hollow Dome -14.7cc 2V, .060 Oversized, w/ Rings, Each

KB Piston, 4 in. Bore, For Ford 302 Rod 5.090 Hollow Dome -14.7cc 2V, .060 Oversized, w/ Rings, Each

$1,150.95

Motive Gear Differential Bearing Kit, Koyo, For AM GENERAL HUMMER 1992–2001, Kit

Motive Gear Differential Bearing Kit, Koyo, For AM GENERAL HUMMER 1992–2001, Kit

$256.79

Motive Gear Nv4500 M/S Chev P-Series (Bolt, Each

Motive Gear Nv4500 M/S Chev P-Series (Bolt, Each

$404.23

TURBOSMART Boost Reference Adapter, For VW Golf GTI Mk5/6, Black, Each

TURBOSMART Boost Reference Adapter, For VW Golf GTI Mk5/6, Black, Each

$61.67

Wilwood Caliper, AERO4-DS, Radial, 0.81 in. Rotor Width, 15.00 in. Rotor Dia, 1.12/1.12 in. Bore, Universal, Alum, Black, Each

Wilwood Caliper, AERO4-DS, Radial, 0.81 in. Rotor Width, 15.00 in. Rotor Dia, 1.12/1.12 in. Bore, Universal, Alum, Black, Each

$871.85