Repair / Repairs / Add leverage safely to a tight nut or bolt

Repair

Add leverage safely to a tight nut or bolt

Rider jobNo special toolsTime: 5 to 15 min (estimate)

A tight nut on an axle or engine mount sometimes needs more turning force than the handle of one spanner gives. A longer handle gives that force. This page shows safe ways to add length.

Safety

  • A longer handle can slip or break a fastener. Make sure the spanner or socket is square on the nut and fully engaged before you pull.
  • Pull towards you where you can. If you must push, keep your open hand flat so a slip does not hurt your knuckles.
  • Keep your face and body out of the line of the handle. The bike can fall if the stand is weak: check it is stable first.
  • Do not use a long handle on small bolts, aluminium threads or anything with a low torque value. A long lever can snap them. For tightening, use a torque wrench: Use a torque wrench correctly.

Options, from shortest to longest

  1. Joined spanners. Take a second combination spanner of similar size. Hook the closed ring of one onto the open end of the other. The two together make a longer handle.
  2. Breaker bar. A long, strong handle that takes sockets. It is made for loosening, not for tightening.
  3. Pipe or tube over the handle. Slip a steel pipe over the handle of a spanner or breaker bar. An old fork tube works, and so does any strong tube.
  4. A tube with the end squeezed. If the tube is too wide, squeeze the end in a vice until the bar fits inside.

Steps

  1. Spray the fastener with penetrating oil and wait. See Remove a rounded, seized or broken fastener.
  2. Fit the socket or ring spanner fully on the nut. A six-point socket grips better than a twelve-point socket: see Choose and use spanners and sockets.
  3. Add the extra handle. Check it is firmly seated.
  4. Pull steadily. Do not jerk.
  5. If the nut still does not move, stop. Heat, more oil or an impact driver is the next step: Loosen a tight screw with an impact driver.

Check your work

  • The nut turned without rounding its corners.
  • The threads and the part are not damaged.

If it did not fix the problem

Problems this repair helps with

Sources

Values marked K-Light 125 are for that reference bike. Use your own bike's manual for its values. Text CC BY-SA 4.0, Transitions Lab.