| 摘要 |
A thread gauge which attaches to an inside micrometer to measure the thread pitch diameter of internally threaded parts. A pair of anvils have external threads which match in pitch with the threads of the part. Each anvil has a bore which receives a ball and a slot which receives a stem projecting from the ball. Mounting sleeves connect the stems with the opposite ends of the micrometer. Each anvil can rotate on its ball about the stem axis so that the micrometer can be adjusted to position the anvils against the threaded part. The anvils can also move linearly on the balls to properly align with the threads of the part.
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