Chapter 6 Fastening Operation
PAGE 6-24
6-5-1 Example of Fastening Reject item Display
1. Torque High Limit Judgment
Peak Torque High limit Reject
Cause: Seizing / locking of threads, excessive speed
Torque Inhibit High limit Reject
Cause: Workpiece problem, Torque required during thread cutting is too
high
2. Angle High Limit Judgment
Angle High limit Reject
Cause: Elongation of screw during final fastening, threads starting to strip,
wrong gasket material
3. Rate High/Low Limit Judgment
Rate1 Low limit Reject
Cause: Thread problem – large rotation with little torque rise,
thread/fastener yielding
Rate1 High limit Reject
Cause: Thread Problem – very little rotation with a large torque rise:
Crossthread, trying to fasten on a bolt already torqued, fastener being
torqued into blind hole (fastener hits bottom)
Rate2 Low limit Reject
Cause: Fastener or thread is yielding (stretching)
Rate2 High limit Reject
Cause: Trying to fasten on a pre-torqued bolt, tapped
threads ended in hole – cutting threads, blind hole
Rate3 Low limit Reject
Cause: Fastener or thread is yielding (stretching)
Rate3 High limit Reject
Cause: Trying to fasten on a pre-torqued bolt,
Seized bolt
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