C251A Steel Beam Trammel 51205

251 Steel Beam Trammels and Attachments
Steel Beam Trammel, 9"

The Starrett C251A is a rigid, well-designed trammel for layout, scribing, and measuring distances and circles. The top of the beam is flattened so that when the trams are clamped in position, they will not turn from pressure on the points. Trammel, 9"-¥ (225mm) Dividing Range points.

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  • Rigid, well-designed
  • The top of the beam is flattened so that when the trams are clamped in position, they will not turn from pressure on the points
  • The 3" (75mm) points may be adjusted for length in the spring chucks and can be easily replaced with caliper legs or other attachments listed
  • The ball points with 3" (75mm) holder permit working from holes up to 1-1/2" (38mm) in diameter
  • A pair of 3" (75mm) caliper points is included with each trammel
  • One tram has a fine-adjusting screw for the points
  • Held in place by spring friction, which prevents them from sliding when the nuts are loosened for setting
  • Each tram has a knurled swivel grip at the top that turns freely, making it very convenient to swing the tool when scribing circles


  • Made in America: Yes
  • Maximum Dividing Range (in): 9"
  • Maximum Dividing Range (mm): 225mm
  • Maximum Scribing Diameter Range (in): 18"
  • Maximum Scribing Diameter Range (mm): 450mm
  • Beam Size (in): 10-1/2"
  • Beam Size (mm): 263mm


    Catalog 33 - Section 14 - Calipers, Dividers, and Trammels

    Manufacturing calipers and dividers since about 1890, we continue to build them with the same level of quality today. Even with many more options available today, these tools are still the best choice for many measurement transfer, scribing and other jobs. We also offer trammel heads, divider points and attachments.

    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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    California Proposition 65 Warning

      WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer, and birth defects or other reproductive harm. For more information go to: www.P65Warnings.ca.gov