50 Degree Frog for No. 4 & 5 Bench Planes Lie-Nielsen Toolworks

50 Degree Frog for No. 4 & 5 Bench Planes



50° High Angle Frog

Until now, all Stanley-type bench plane irons were bedded at 45°, or Common Pitch. But the famous English Smoothers like Norris are usually 50° (York Pitch) or 55° (Middle Pitch). The higher pitches make smoothing difficult wood easier. York Pitch will handle most tear-out prone wood well. Middle Pitch is for the most difficult woods.

These unique High Angle Frogs quickly convert our bench planes (No.3 - No.7) to York Pitch. Will not fit other makes of planes.

Notes on Using the High Angle Frog with a Conventional Chipbreaker

Conventional bench planes have the blade set in the tool, or pitched, at an angle of 45°. Our unique High Angle Frogs pitch the blade 5° to 10° higher.

If you have our old style Chipbreaker with a very fine mouth setting, shavings may clog the throat. This is especially true if you prefer to set your chip breaker (back iron) very close to the cutting edge. Because our blades are so thick, you will probably find that you can move the chip breaker back, creating more clearance.

If you still get clogging, then file the leading edge of the mouth at a slight angle to allow chip clearance. It is best if you do not file all the way to the sole, but leave a small flat. To make it easier to see what you are filing, blacken the area with a magic marker.


Manganese Bronze, Brass and Steel.


Materials and workmanship are guaranteed for the life of your tool. Call for repairs or replacement parts. We are available for advice if you ever have a problem using your tool.

Proposition 65 Notice:

Bronze and brass alloys contain lead, a chemical known to the State of California to cause cancer and birth defects, or other reproductive harm. Wash hands after handling.