Test #1
In our initial test, we found the following:
| Retention Knob Manufacturer | Inspection Results |
| Lyndex | *Heads are soft (possible shallow case) *Experienced breakage |
| Retention Knob Supply | *Undersized major diameter (65% thread) *Undersized pitch diameter *Un-even heat treat *Soft surface hardness |
| US Shop Tools | *Soft surface hardness *Thread relief too wide resulting in thread length not being long enough to support maximum pull |
| Command | *Undersized major diameter (60% thread) *Double thread condition |
Testing Results
The test results from J & M Machine can be viewed below in PDF format. (Click icon to download Adobe Reader 
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Third-Round Test Results
- BT40 Command Toolholder Tests 10/30/2009
- BT40 Techniks Toolholder Tests 10/30/2009
- BT40 Kennametal Toolholder Tests 10/30/2009
Second-Round Test Results
Retention Knob Torque Test.com 