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Telescoping Gage Set, 6-Piece 5/16 - 6", Starrett

Telescoping Gage Set, 6-Piece 5/16 - 6", Starrett - Main image
$223.99 $349.99 In stock

Starrett telescoping gages are used for determining the true size of holes, slots, and recesses up to 6" (152 mm). The ends of both contacts are hardened and ground to a radius to allow proper clearance on the smallest hole the gage will enter. These tools must be slightly "rocked" in the hole being measured to ensure that the tool is on the proper diameter before it is locked and withdrawn. The final hole size is obtained by measuring over the gage contacts with a micrometer.

The No. 579 Series telescoping gages have handles that are rigidly attached to the contact plungers and are automatically self-centering. Also, the No. 579 gages have two telescoping contacts.

The handles are approximately 2-3/8" (60 mm) long. Constant spring tension gives uniform contact pressure and both plungers are easily locked at any desired setting.

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Customer Reviews (4.8 / 5 · 5 reviews)

Ella P. ★★★★★

I've been chasing true hole sizes for years and these finally give me readings that actually match my micrometers. The hardened contacts slide smoothly into slots without binding, and the lock mechanism holds firm enough to trust the measurement every time.

Madison Q. ★★★★★

The hardened and ground radius on the contact points make these easy to slide into bores without catching on edges. I was able to get a consistent, repeatable reading on a 2-inch hole within a few tries.

Nicholas ★★★★★

I needed a set of telescoping gages for measuring some odd-sized slots on a repair job, and the hardened contacts on these slid into place without any binding. The lock mechanism feels solid and holds the measurement exactly where I set it, which gives me confidence in the reading.