The Ford Barn - View Single Post - Understanding Bolt Torque vs Clamping Force

johnneilson · 07-02-2020, 10:56 AM

Bob,

The attached chart shows the clamping force capability of the fasteners based on preventing "yield" of the fastener. The yield of the fastener is directly proportional to the "grade" or quality of the fastener and/or application.
It is a really good starting point, shows both dry and lubed torque values.

What the chart cannot factor in is the material of the assembled parts.
Usually in discussion is the head/gasket/block assembly.
The gasket creates a compressed material that is directly affected by the clamping forces applied. What most probably are not aware of is the distortion caused in the deck surface of the block when attempting to clamp too tightly, the result is inconsistent clamping and usually a leaking gasket.

This is a good topic of discussion, enjoy the 4th, John

07-02-2020, 10:56 AM	#5
johnneilson Senior Member Join Date: Jun 2010 Location: 34.22 N 118.36 W Posts: 1,057	Re: Understanding Bolt Torque vs Clamping Force Bob, The attached chart shows the clamping force capability of the fasteners based on preventing "yield" of the fastener. The yield of the fastener is directly proportional to the "grade" or quality of the fastener and/or application. It is a really good starting point, shows both dry and lubed torque values. What the chart cannot factor in is the material of the assembled parts. Usually in discussion is the head/gasket/block assembly. The gasket creates a compressed material that is directly affected by the clamping forces applied. What most probably are not aware of is the distortion caused in the deck surface of the block when attempting to clamp too tightly, the result is inconsistent clamping and usually a leaking gasket. This is a good topic of discussion, enjoy the 4th, John __________________ As Carroll Smith wrote; All Failures are Human in Origin.