2PCS Engraved Size Marking Hand Tap M18 x 2.5mm / M20 x 2.5mm Straight Flute Tap Automotive Repair

Label:Yes - ALLOY TOOL STEEL CONSTRUCTION - Each tap is made from hardened alloy tool steel with H2 tolerance grade, providing durable cutting performance on steel, cast iron, aluminum alloy, and brass workpieces for machining and heavy equipment maintenance applications.

- TWO LARGE METRIC SIZES - This set covers two large-diameter metric coarse-thread sizes: M18 x 2.5mm pitch (drill 15.5mm) and M20 x 2.5mm pitch (drill 17.5mm), addressing common requirements for machinery base mounting, structural fastening, and heavy equipment repair tasks. - ENGRAVED SIZE MARKING - Each tap shank features clear size engraving (such as M18X2.5) for quick identification without referring to packaging, reducing selection errors when working with multiple tap sizes in the workshop.

- 4 STRAIGHT FLUTES DESIGN - The four-flute configuration facilitates chip evacuation during the tapping process and delivers stable thread formation across steel, cast iron, and aluminum materials in both manual and machine-driven use on large-diameter coarse-pitch threads. - TAPER AND PLUG TAP PAIR - Each size includes one taper tap for initial thread cutting and one plug tap for completing full-depth threading to specification, enabling two-pass tapping for clean and accurate internal threads on through-hole and blind-hole applications.

Specifications: Material: Alloy Tool Steel (Hardened) Flute Type: 4 Straight Flutes Tolerance Grade: H2 Thread Standard: Metric (ISO) Thread Direction: Right-Hand Finish: Polished / Black Oxide (varies by size) Shank Type: Square Drive End Size Marking: Engraved on Shank Color: Sliver

Size Options: - M18 x 2.5mm (Drill Diameter: 15.5mm / 0.61in) - M20 x 2.5mm (Drill Diameter: 17.5mm / 0.69in)

Compatibility: Suitable for cutting internal threads in steel, mild steel, cast iron, copper, brass, aluminum alloy, and plastic materials. Compatible with tap wrenches, drill press chucks, CNC lathe tool holders, tapping heads, and handheld tapping fixtures. The taper-and-plug pairing supports both through-hole and blind-hole threading applications in machining workshops, equipment repair, mold making, agricultural machinery maintenance, construction equipment service, marine hardware installation, and general metalworking tasks. Recommended for coarse-pitch (coarse thread) applications on machinery bases, mounting flanges, structural bolt holes, and large-diameter fastening points.

Package List: 2 x M18 x 2.5mm Machine Taps 2 x M20 x 2.5mm Machine Taps (Total: 6 pieces, 2 pieces per size)

Tips: 1.Due to the light and monitors effect, colors may have lightly difference. 2.Please allow slightly size errors due to manual measurement. Thank you for your understanding!