Starrett 178A Radius Gage Set 1/32-1/4" Inch Reading 30 Leaves Concave & Convex

The Starrett 178A is a professional-grade fillet and radius gage set designed for precision measurement of both concave and convex radii. Covering a range of 1/32" to 1/4" in 64ths-inch increments across 30 individual leaves, this set is an essential tool for tool and die makers, machinists, screw machine operators, and patternmakers who need to accurately lay out and inspect radii on tools, dies, patterns, and other precision components.

Key Features:

• 30 stainless steel leaves covering 1/32" to 1/4" range in 64ths increments
• Measures both concave and convex radii — each leaf is double-ended
• Each leaf is clearly stamped with its radius size for fast, easy identification
• Integrated locking device secures any selected leaf firmly in position during use
• Precision-finished edges for accurate, consistent readings
• Satin chrome finish for corrosion resistance and durability
• Compact folding design — 4-1/64" L x 15/32" W x 1-59/64" H
• Made in the USA from high-quality steel

The 178A is part of Starrett's trusted 178 Series radius gage family, available in both inch and metric sizes to suit a wide range of shop applications. Whether checking fillets on machined parts or laying out radius curves on patterns, the 178A delivers the precision and reliability that Starrett has been known for since 1880.