The LiMARĀ® Knuckle Jar is designed to provide a point of flexibility along the length of a wireline toolstring as well as providing a short bi-directional mechanical jarring action.

The Knuckle Jar is often used within a toolstring to convey downhole data acquisition tools where a long stroke mechanical type jar may cause damage to the internal components of downhole gauges. Configuring a Knuckle Jar within the toolstring also enables it to pass unrestricted over nipple shoulders, tubing crossovers and other points where a rigid toolstring may encounter difficulty.

Download PDF


  • To provide a point of flexibility and short stroke jarring action within a wireline toolstring


  • 10 degree deflection angle from centre line
  • Contingent fish necks on lower components to enable recovery
  • Connection options to suit customer requirements
  • Simple, robust design ensuring ease of operation for the end user
  • Selected components QPQ treated
  • Hexagonal flats for safe make-up & break-out
Assembly Part No. Actual OD Fish Neck Connection Contingent Fish Neck Stroke Make up Length (Closed)
1034-1250-XXX-RX 1.250" 1.187" Optional 1.187" 2" 13.37" (LQK)
1034-1500-XXX-RX 1.500" 1.375" Optional 1.375" 2" 15.17" (LQK)
1034-1750-XXX-RX 1.750" 1.375" Optional 1.375" 2" 15.50" (LQK)
1034-1875-XXX-RX 1.875" 1.750" Optional 1.750" 2" 15.63" (LQK)
1034-2125-XXX-RX 2.125" 1.750" Optional 1.750" 2" 15.88" (LQK)
1034-2500-XXX-RX 2.500" 2.313" Optional 2.313" 2" 20.28" (LQK)

XXX - Last 3 digits of part number denotes connection type
For additional sizes or further information please contact sales

Ask our team a question?

Contact us


Our highly skilled engineering and technical sales staff are on hand to offer customisable, fast-response solutions for your well servicing needs.

Contact us