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Are you building or adding to a permanently mounted reference system?  The 1.5THR is made exactly for that purpose - establishing permanent target points on jigs, fixtures, tools, and machinery.  Use 1/4" bolts through the two counterbored holes in the base to provide secure mounting.  Then, two other 15/64th holes act as drill guides for placement of dowels.   Once the 1.5THR is bolted down, use a 15/64ths drill through these guide holes into the substrate, ream to 1/4", and insert dowels for a permanent fix on the target's position.

A lid is included to keep out dust and dirt when not in use, held in place by the same magnet that secures an SMR in the nest.  The lid overhangs the base slightly to aid in removal. For a tethered version of the same product, specify 1.5THR-TL (below, right).

Mounting holes:  0.266" (6.76mm) diameter, counterbored to 0.438" (11.13mm) dia., 0.250" (6.35mm) deep, on 1.750" (44.45mm) centers

Doweling holes:  0.235" (5.97mm) dia. through, on 1.750" (44.45mm) centers

Lid diameter:  2.250" (57.2mm)

Base and Lid Material:  Stainless steel

Hardness:  HRC 42-45

• Any 1.5" diameter SMR