5/8 inch drive Extensions

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5/8 inch drive extensions

The extensions are marked. The 6 inch and 12 inch are HD-6 and HD-12. The label is on the shaft, the receiver is unmarked and polished.

The picture to the right shows the catalog drawing on top, then a 1927 square extension and an undated (1931?) round extension. 1923 - 1929 are square shaft.

Below these are 3 labels, the one of the top is 1930-31, the center is 1926? to 1929. The lower one is 1923 - 1926?

 

Stock Number	Description	Date range
HD 6	Extension 6 inch (pre 1929 are square shank)	1923 – 1931
HD 12	Extension 12 inch (pre 1929 are square shank)	1923 – 1931

 

Stock Number	Description	Date range
IMB-81D	Impact ball type Universal Joint	1975
A-3031	Hexagon Power Shank	1975
PHD-6	6 inch Power Extension	1975
PHD-12	12 inch Power Extension	1975

 

 

HD-6 Extensions

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The same as about except the length, early extensions are square. There are 3 logos (same as above). This square example shows some torque.

 

 

 

 

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