Starrett 159M Metric Screw Pitch Gauge 28-Leaf 0.5-11.5mm 60° Thread

The Starrett 159M Screw Pitch Gauge is a precision metric thread-identification tool designed for machinists, mechanics, and quality control professionals. It quickly and accurately determines the pitch of metric threads ranging from 0.5mm to 11.5mm, conforming to the International Metric Standard 60° thread form.

The gauge features a durable steel case housing 28 folding leaves, each precisely machined with teeth corresponding to a specific metric pitch value stamped directly on the leaf for easy identification. A thumb-screw locking device at both ends of the case holds the selected leaf firmly in position during measurement, ensuring consistent and reliable readings.

Key Features:

• 28 precision steel leaves covering pitches: 0.5, 0.75, 1, 1.25, 1.5, 1.75, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, and 11.5mm
• Metric pitch range: 0.5mm to 11.5mm
• International Metric Standard 60° thread form compatibility
• Narrow leaf design permits checking both internal threads (nuts, tapped holes) and external threads (bolts, screws)
• Locking device at both ends secures leaves in position for hands-free use
• Pitch value stamped on each individual leaf for fast, accurate identification
• Substantial steel construction for durability in workshop environments
• Made in the USA

Starrett screw pitch gauges — also known as thread pitch gauges or thread gages — are among the most essential tools in any machinist's or mechanic's toolbox. The 159M is the ideal choice for identifying metric fastener threads across a wide range of industrial and maintenance applications. Also referenced as Starrett catalog number 50591.