There are two styles of Heli-Coil® tanged screw thread inserts. The standard or “Free-Running” tanged insert provides a smooth free-running thread, while the “Screw-Locking” tanged insert provides self-locking torque on the male member by a series of “chords” on one or more of the insert coils. All tanged screw thread inserts offer savings in space, weight, and money through the elimination of lock wiring, lock nuts, lock washers, chemical compounds, plastic pellets/patches, and other locking mechanisms. These inserts from Stanley Engineered Fastening are the original coiled insert and have an extensive background of tension, torque, shear, vibration, and fatigue tests conducted by leading companies as well as the U.S. Military.
FEATURES:

• Require no staking, locking, swaging, keying or interference fit
• Automatically adjusts to any expansion or contraction of the parent material
• Anchor permanently in place against the tapped hole
• Positively secures threaded members against vibration or shock loosening
• Positive self-locking torque, complying with NSAM8846
• Available in inch and metric series