Gem Instrument Company

Gem Instrument has been a leading manufacturer of precision instruments for over 50 years. We are manufacturers of swivel clamps, dial indicators and magnetic bases as well as custom products. Our state-of-the-art computerized numerical controlled machines ensure quality products. We provide products to manufacturing, assembly and service industries.

Gem Adjustable Swivel Clamps

Swivels designed for your exact applications

Our standard material for swivel clamps is 12L14 carbon steel with a black oxide finish.

  • Anti-vibration lock provides positive, rigid holding power
  • Any combination of 17 standard size holding diameters:
  • Heavy Duty: from 3/8" x 3/8" to 1" x 1" diameter
  • Medium Duty: from 5/32" x 1/4" to 1/2" x 3/8" diameter
  • Available in: stainless steel for sanitary and corrosion-resistant applications
  • Special sizes available | Available with flanged hex nut for greater torque


  • All Clamps available with color coding
  • Stainless steel or other materials as required
  • Metric and special sizes available on request
  • Positive Locks