Thread repair insert for fixing damaged M4 bolt holes in equipment.

Go ring gauge for verifying M4 metric threads in production.

Calibrated ring gauge for checking small M4 threaded holes in components.

Thread plug gauge for checking M4 bolt thread quality and pitch diameter accuracy.

Precision ring thread gauge for M4 x 0.7 metric threads with calibration certificate.

Calibrated plug gauge for checking small M4 metric thread specifications.

No-go ring thread gauge for M4 fastener verification and quality inspection.

Black nylon terminal post for low-voltage testing up to 10 amperes.

Red nylon terminal post for low-voltage testing with 10 amp capacity.

Black 10-amp 125V terminal post for light-duty testing.