The slug of a side outlet punch feeds through the exhaust chute machined into the side of the punch. Side outlet punches are used when your application calls for scrap to be ejected – as in feed thru – but this punch does not require the use of a bolster plate. Other than the location of the exhaust hole for the slugs, differences between the feed thru punch and the side outlet are that the side outlet is machined out of a solid piece of steel, and it’s use of a shoulder. A side outlet shoulder is defined as the machined area of the punch from the top to the cut edge to just above the exhaust chute.
The most common type of side outlets is standard and heavy duty. The heavy-duty side outlet is used for thicker, heavier, abrasive materials, has an elongated shoulder often includes a “knurl”. A knurl is raised portion located at the bottom of the punch similar to the texture to a ratchet handle. It is approximately .005″ to .010″ larger than the base size of the punch and is 1/4″ wide. The knurl is used to prevent the punch form spinning or becoming misaligned in the dieboard. The standard side outlet is used for easier to cut, medium to thin materials. It has a shorter shoulder than does the heavy duty and does not include a knurl unless specified. A quality side outlet should be razor sharp, free of tool marks, scale and burrs. It should include a slight support bevel on the inside for strength as well as the undercut, which prevents the slug from jamming the punch before it enters the exhaust chute.