Starrett 156M Metric Screw Pitch Gauge 28 Leaves 0.25-2.50mm 60° Threads

The Starrett 156M Metric Screw Pitch Gauge is a precision thread-identification tool designed for machinists, mechanics, and engineers who need to quickly and accurately determine the pitch of metric screws, bolts, and threaded fasteners. Featuring 28 folding steel leaves covering a range of 0.25 to 2.50 mm, this gauge handles the full spectrum of International Metric Standard 60° thread pitches encountered in everyday machining and maintenance work.

Key Features:

• 28 hardened steel leaves covering pitches: 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 1.00, 1.10, 1.20, 1.25, 1.30, 1.40, 1.50, 1.60, 1.70, 1.75, 1.80, 1.90, 2.00, and 2.50 mm
• Designed for International Metric Standard 60° threads
• Pitch value clearly marked on each individual leaf for fast identification
• Locking device at both ends of the case securely holds selected leaves in position during use
• Specially designed narrow leaf profile permits checking both internal threads (nuts, tapped holes) and external threads
• Substantial steel case construction for durability in shop environments
• Meets or exceeds accuracy and performance requirements of national and international standards — traceable to NIST
• Made in USA — EDP No. 50589

The Starrett 156M is an essential thread-pitch reference tool for any toolbox, inspection area, or machine shop. Its compact folding design keeps all 28 leaves organized and protected, while the dual locking mechanism ensures reliable, hands-free measurement during use.