Range: 5/16" - 6" (8mm to 150mm), 6 pc set includes:
1 gage: 5/16 - 1/2" range x 4.20" overall
1 gage: 1/2 - 3/4" range x 4.40" overall
1 gage: 3/4 - 1-1/4" range x 4.40" overall
1 gage: 1-1/4 - 2-1/8" range x 5.85" overall
1 gage: 2-1/8 - 3-1/2" range x 5.85" overall
1 gage: 3-1/2 - 6" range x 5.85" overall
Spring loaded with locking knurled knob
Stainless Steel Construction
Gage expands in a hole to be measured (locks in place and then removed to determine final hole size using a micrometer or calipers).
Get exact sizes of holes, slots, bores, or recesses
Rigid handle and double action design (self-centering) for quick checking of inside measurements
Constant spring tension for uniform feel
Contact points are hardened tool steel and precision ground in the end measuring radius
| Range | mm | 8-12.7 | 12.7-19 | 19-32 | 32-54 | 54-90 | 90-150 |
| in | |||||||
| L | mm | 102 | 102 | 102 | 127 | 127 | 127 |
| in | 4 | 4 | 4 | 5 | 5 | 5 |
Steps
Collapse the telescoping gage.
Secure the telescoped gage by turning the knurled ring, lightly tightening it.
Insert the gage into the bore to be measured.
Roughly align the handle parallel to the axis of the bore, and release the knurled ring. A little practice - before measuring - locking and unlocking the ring will give the user a knack for gradually extending the gages tubes against the bore without having them slap vigorously against the bores surfaces.
Lock the knurled ring very lightly, then rocks the gages handle about the bores axis. Properly accomplished, the user will discern a light "drag" on the gage as the lightly-rounded gage ends engage the bores surface at its largest diameter. If no drag is felt, the gage tubes are NOT ninety-degrees to the bores axis and aligned at its largest diameter. The user MUST wiggle the gage handle until this is accomplished.
Tighten the knurled ring a bit more to ensure that the gage ends are held in position for measuring.
Using an outside micrometer or a vernier caliper, rock the telescoping gage until a drag similar to that felt in the bore is felt against the faces of the measuring device
