| 摘要 |
An apparatus for measuring mechanical strain in a bolt, stud or other tensile member includes a measuring rod which is held in a fixed position with respect to a selected point in an axial bore in the tensile member being measured. A bolt extension tube extends into the axial bore to provide a wrench support function and is held in a fixed position with respect to a second point on the tensile member. Straining the tensile member results in a relative displacement between the rod and the tube which is proportional to tensile member elongation. Means are provided for setting a preselected strain, measuring strain, displaying strain and providing a control signal to control straining of the tensile member.
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