The Big Horn 17042 4-Inch Outside Caliper is a compact, high-accuracy tool designed for external measurements on smaller workpieces. Ideal for machinists, woodworkers, and metal fabricators, this caliper is perfect for transferring dimensions from round stock or irregular shapes to layout tools or measuring devices. Built from durable forged steel, it features hardened points for accurate marking and long-term wear resistance. The finely threaded adjustment screw provides smooth, infinite calibration, while the hardened fulcrum spring and tempered bow spring maintain consistent tension without side play—ensuring stability and precision every time.

Features:

• Ideal for External Measurements – Accurately gauges the outer dimensions of small round stock, pipes, or irregular surfaces.
• Compact 4-Inch Design – Perfect for fine detail work or tight spaces where larger calipers may be cumbersome.
• Forged Steel Construction – Ensures long-lasting strength and durability under frequent use.
• Hardened Points – Sharp, wear-resistant tips allow for precise, repeatable contact with the work surface.
• Threaded Spool Adjustment – Offers smooth, controlled, and infinite adjustment for accurate measurement settings.
• Self-Seating Washer & Nut – Allows for quick, secure adjustments that won’t shift during use.