/ Precision Measuring Tools / Precision Hand Tools / Slide Calipers / Vernier & Pocket Calipers / 456A * Not actual product image 52422 456A Gear Tooth Vernier Caliper 52422 Other similar products The Starrett 456 Gear Tooth Vernier Caliper is designed to measure in .001" or 0.02mm the thickness of gear teeth at the pitch line (the chordal thickness of the teeth) using the distance from the top of a tooth to the chord. For the same purpose, it can also be used for measuring hobs, form and thread tools, etc. 20-2 Diametral Pitch. Note:This item is discontinued. Please consider the recommended alternative listed above or contact our special order department at (978) 249-3551 x410 for more information. Features Specifications Parts Downloads Contact Starrett Features Can be used for measuring hobs, form and thread tools Adjusted independently by screws on the graduated bars Thickness of a tooth at the pitch line is measured by an adjustable jaw after the addendum is set by the adjustable tongue Specifications Range (in): 0 to 1-1/4" Graduations (in): .001" Accuracy (in): +/-.0005" per foot Parts Member of Kit Item #DescriptionPart No.QtyInformation 1BARNOT AVAILABLE 11* SEE NOTE 2VERTICAL JAW HOLDERNOT AVAILABLE 21* SEE NOTE 3HORIZONTAL JAW HOLDERNOT AVAILABLE 31* SEE NOTE 4VERNIER PLATENOT AVAILABLE 42* SEE NOTE 5CARRIER SUB ASSEMBLY05828-02 6GIB, CARRIER FILLER17972-04 7SCREW, .100-56 LOCK X .393 LONGPT079594 8NUT, .100-5605832-02 9ROD, .100-56 ADJ.02427-02 10SCREW, .085-60 SET X .389 LONG05834-01 11SCREW, #1-64 SLOT X .088 LONGPT01195A4 12PIN, .040D X .188L05835-01 13COLLAR, ADJ. SCREW05856-02 14* CUSTOM FIT AT FACTORYNO-NUMBER0 Downloads Catalog 33 - Section 2 - Slide Calipers Our calipers are light, comfortable, easy-to-use, and constructed with features that have made Starrett slide calipers the machinist's first choice for many years. Precision Hand Tools (Catalog 33) 612 page catalog featuring precision hand tool, force measurement, vison systems, optical comparators, laser measurement, and flat stock.