SHAFT LOK INC. since 1979
New Berlin, Wisconsin 53151 USA

Contact Anne at:


Phone:1 262 786 6800

Leave a message if the machine answers. We will return your call. We are usually available Monday through Friday 9am to 4pm Central Standard Time.

May 15, 2021

We have tried to answer FAQ but should you have ideas that would help us improve this web page please let us know.

Sailors, just like you, enjoy sailing a little more since using Shaft Lok. While sailing Shaft Lok locks the propeller in the most efficient position, vertical in the rudder and keel opening (if that is what you desire), for the best boat speed, quiet operation and without transmission or propeller shaft bearing wear life. The propeller is held stationary regardless of yacht speed. All that is necessary to release the lock is to start the engine and engage the transmission. Shaft Lok automatically unlocks.

Shaft Lok Prices:

Mod I $310 United States Dollars, Maximum Bore is 1 1/4 inches.

Mod II Easy Lok Bore 1.250 and smaller is $880, greater than 1 1/4" is $950, 50mm or larger is $1130,

Maximum Bore is 2.250.

Mod II Easy Lok, High Torque is $1180

Maximum Bore is 2.250.

Mod III Easy Lok $1,340 with 64mm or smaller, $1,385 with 65mm or larger Maximum Bore is 80mm.

Mod III Easy Lok, High Torque $1,685 Maximum Bore is 80mm.

Mod IV Easy Lok Price on Application Maximum Bore is 4.3 inches or 110mm.

The above prices include these Bore sizes currently in stock:

Mod I: 1.125 and 1.250. Mod II: 1.000, 1.250, 1.500, 2.125 inches and 35, 40, 45 and 50mm. Mod III: 2.000".

All other bores are custom: Mod I and II EL $260, Mod III EL is $310 each.


1 to 5 feet $175, 6 to 10 feet $156, 11' to 15' $175, 16' to 20' $230, 21' to 25' $220 and 26' to 30' is $215.

Custom length Cables are included ie; 5.9 feet is $140.

Maximum Cable length is 30 feet. Custom length Cables are available, allow one week for shipment.

A Simple Spring Locking System

The SSLS is $96, in lieu of a cable, three inches long fitted to the top of a Shaft Lok Mod II EL or Mod III EL Unit.

Approximate Boxed Shipping Weight in pounds: Mod I 11, Mod II EL 15,Mod III EL 23.

TO ORDER indicate unit (Mod I, II or Mod III), shaft size and cable length. Bank Wire transfers are accepted. If paying by Check the instrument must be drawn on a United States of America bank in USA dollars. The minimum order is $30.00.

To insure the Shaft Lok unit will fit use a cardboard rotor template cut in half; 6.75 diameter for Mod II EL and 11.75 for Mod III EL, with centered hole for propeller shaft.

Changes of the bulletin back cover backcover_photo.htm since publication: (dimensions shown on the back cover page)


Maximum Bore 2.250 & 3.000/80mm
Width 2.000 & 2.690
Diameter 6.702 & 11.750
Weights 15 & 23 pounds.

For faster and quieter sailing...

Kenneth R. Nigel