A Grip Neck or Wood Stem, as the name implies, is ideal for equipment made of wood. The design and function of the stem are similar to that of a grip ring, however, there are some noted distinctions. They are found only on furniture and institutional casters.
A grip neck stem, as the depiction to the right shows, uses a flanged top to capture the stem in the socket. Generally speaking, a grip neck or wood stem caster requires the use of a pre-manufactured socket, pictured below right. Though most commonly used on wood furniture, they are used on certain plastic and metal equipment.
Unlike a grip-ring stem, grip neck stems are available in one size, 5/16″ diameter x 1-1/2″ long. Given that, they are, by far, the easiest to find replacements for, should they break. As opposed to grip ring or threaded stem where a multitude of similar looking options exists.
There are a few noted disadvantages to using a grip neck stem. First, they are incredibly hard to remove from the socket once installed. Secondly, even though the measurements are the same, sometimes, using a different manufacturer for the stem and socket can cause issues.
A grip neck stem makes an excellent option for wood furniture that needs to be mobile. If you need more information, let us know.