Contact points are always available from Long Island Indicator Service. There are four components to take into consideration.
- ball diameter
- thread diameter
- contact point length
- ball composition
New indicators come supplied with .080" diameter balls as standard. We list the most common sizes below, but for special needs other diameters are often available. Thread diameters vary from manufacturer to manufacturer but are generally metric threads. Manufacturers differ in their method of measuring contact point lengths. It is imperative that the correct length point is used. Refer to the charts below for details on how the length is determined.
What are the contact points made of?
Our contact points are turned from #303 stainless steel and have carbide, ruby, Nylon or Teflon balls.
- "Alloy 303 is a non-magnetic, austenitic stainless steel that is not hardenable by heat treatment. It is the free machining modification of the basic 18% chromium / 8% nickel stainless steel." [source: pennstainless.com/stainless grades]
- austenite = a solid solution of carbon in a nonmagnetic form of iron, stable at high temperatures. It is a constituent of some forms of steel. [Oxford English Dictionary]
We recommend carbide balls over chrome or steel for its durability. For special applications you may need the ruby, sapphire, teflon, nylon or some other exotic. Please email special requests.
The contact points listed here are home grown. They're every bit as good as the originals yet they cost less. We give you the manufacturer's ordering number for ease of reference. If you'd rather have the manufacturer's own contact points please send us a request for quotation.
How to install a contact point
Most test indicators come with a little wrench of some sort designed to help you tighten—or loosen—a contact point. Some points have a little hole drilled through them so that you can insert a pin which can then be used to twist the point. Others have two flat spots designed to work with the wrenches supplied. Still others have a hexagonal area which works very well with a pair or small pliers. In all cases, small pliers can be used to remove and tighten contact points. Make sure they are nice and snug, hand tightened only. You don't want to force any contact point that refuses to co-operate. Try another point instead. The thread may be damaged, or you may be using a point with the wrong thread. If the thread breaks off inside the indicator, you may have a hard time getting it out and a repair might then be in order.
Xcelite L4G Sub-Miniature Needle Nose Plier with Green Cushion Grip Handle, Smooth Jaw, 4" Length, 13/16" Jaw Length