8 mm Sirius Thimble Prusik

The Sirius thimble prusik is a length of 8 mm cord with an eye at each end protected by a thimble. Thimble eyes hold their shape and resist wear at the connector, which makes this style popular for friction hitches on climbing systems and for rigging tie-offs.

Why thimble eyes

A plain sewn or spliced eye squeezes down on a carabiner and wears where it bears. A thimble keeps the eye open and spreads the load over the connector, so the eye lasts longer and the hitch sits consistently. That is why thimble prusiks are common for rope grabs on rigging lines and for climbers who want a durable hitch cord.

The 8 mm size suits many 11 to 13 mm climbing and rigging ropes, but hitch performance depends on both cord and host rope. Test it before relying on it. Browse our hitch cord for other sizes.

Thimble prusiks are also used on rigging lines as a tie-off or to hold the line when resetting a lowering device. Make sure the cord and thimbles are rated for the use you put them to.

Use and inspection

Tie the hitch you have been trained on and set it low to test grip and release. Watch for glazing, heat damage and wear near the eyes.

Hitch cord used in a climbing system is life-support equipment. Follow the manufacturer's instructions and ANSI Z133, inspect it before every use and retire it at the first sign of damage.