Kiwiprops™

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K4 - Attachment Options


Shaft     Taper      Shaft      Boss Thread O/D  Thread
Diameter     Ratio    Length Length       Type  Length     Keyway





  1.250"   SAE 1:16    3.500"   3.750"   0.875" UNC   1.650"     5/16"
  1.375"   SAE 1:16    3.750"  4.125"  1.000" UNC   1.810"   5/16"
  1.500"   SAE 1:16     4.250"  4.500"  1.125" UNC   2.000"   3/8"
1.125" SAE 1:16 3.125" 3.750" 0.750" UNC 1.450" 1/4" - 5/16"
  Saildrives    SAE 16/32 Spline       76    80

  M16-20 x 2.0  

   22

 Volvo-Yanmar  

  30mm   ISO 1:10
     70    80   M20 x 1.5    30    8 x 7
  35mm   ISO 1:10
     80    90   M24 x 2.0    32  10 x 8
  40mm   ISO 1:10      90   100   M24 x 2.0    35  12 x 8

A K4 unit can mount on an SAE 1.125" SAE shaft using a standard K4 1.250" boss and reducer bush / key ex Tacoma Propeller.

NB:  ISO 40 Bosses mount 20 mm down the taper so have an internal taper length of 80 which plus the 20 gives an effective 100. SAE 1.500" Bosses mount 30 mm or 1 3/16" down the taper to provide an effective 4.500" length. This allows for comon boss sizes with sufficient metal for keyways on larger shaft sizes.

Thread Measurement:

When measuring the thread on a shaft there are two critical dimensions. The diameter which is measured across the widest part of the thread and will equal to or be just under the diameter of the shaft from which the thread was originally cut.

The other measurement depends upon whether it is a metric or imperial  thread.

Pitch in metric terms is simply the distance between two successive threads or the distance a nut would advance over one full turn measured in mm. So an M20 x 2.0 thread would advance 2.0 mm with a single full turn of the thread.

Pitch in imperial terms is measured in threads per inch  ( tpi ) and is the number of threads included over 1" measured along the thread. If the first " hill " is counted as number 0 then for example the 8th " hill " if located 1" along the thread would indicate  8 tpi. Thus 8 turns on this thread would advance the nut by 1".