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RB 18. Standard Reference Bar #(--edpnumber)#

Standard Reference Bars
18" Reference Bar - Free Standing

These Standard Reference Bars are invaluable for use in checking table movement of machine tools, accuracy of vernier height gages, surface plate transfer measurement, and for final inspection of precision machine tools and coordinate measuring machines. The alternating gage block jaws and spacer blocks are permanently wrung and fastened together to form 1" increments.

A special bushing arrangement allows the master stack to conform to thermal conditions prevailing during use, thus providing a true master even under less than perfect laboratory conditions. Mating surfaces are treated during assembly to prevent corrosion.

Non-standard lengths and measuring increments are available on special order.

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  • Free Standing
  • Certificate of Calibration included
  • Furnished in a storage case


  • Type: Free Standing
  • Size: 18"
  • Unit Of Measure: Inch System
  • Tolerance (Stack) Max: 2.5L + 10L in inches
  • Tolerance (Stack) Min: - 10
  • Parallelism: 15 µin.
  • Uncertainy of Calibration: 10 + 2.0L in inches expressed in µin.


    Catalog 33 - Section 19 - Starrett-Webber Gage Blocks

    We offer high-grade steel gage blocks for shop floor use, longer lasting and non-corroding ceramic blocks. Top-of-the-line croblox® Chromium Carbide, are very stable, non-corrosive and have excellent wringability. A variety of sets are available in square- and rectangular block versions. We also offer individual replacement blocks and a range of related accessories.

    Precision Hand Tools (Catalog 33)

    612 page catalog featuring precision hand tool, force measurement, vison systems, optical comparators, laser measurement, and flat stock.

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