Assembly-line slang for a second tightening attempt on a joint already at torque, whether by accident or to clear a fault. Because the fastener barely rotates, a torque-only tool can record a pass even when the first rundown was bad, so tightening controllers watch angle and flag a rehit when torque arrives in too few degrees. Repeated rehits also creep preload up on soft joints.
That OK on station six is a rehit, three degrees of angle, the bolt was already tight from the repair bay.
Also heard as
- re-hit
- double hit
Related terms
Rundown
One complete tightening cycle by a powered tool on an assembly line, from first thread to final torque or angle.
Nut runner
A powered tightening spindle, handheld or fixtured, that drives nuts and bolts to a controlled torque or angle.
Breakaway torque
The torque needed to start a tightened fastener turning again, used to audit joints and rate locking features.
Hard joint
A bolted joint that goes from snug to final torque in very little rotation, typically under about 30 degrees.