Gem Instrument Contact ImageGem Instrument is a 3rd generation family- and woman-owned business. We have been a leading manufacturer of precision instruments for over 65 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

  • 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