Walter-prototyp 5076108 Machine Tap M1.4x0.30 Cobalt

Product Description

The WALTER-PROTOTYP 5076108 is a straight-flute machine tap designed for cutting M1.4 x 0.30 metric internal threads in small-bore applications. Built from M35-grade cobalt high-speed steel with a bright uncoated finish, it handles the thermal demands of tapping harder non-ferrous metals and engineered plastics without coating-induced dimensional buildup. The 3-flute straight-flute geometry suits both blind-hole and through-hole threading operations. Overall length is 40 millimeters with a thread length of 6.5 millimeters and a shank diameter of 2.5 millimeters. The modified bottoming chamfer allows threading close to the bottom of blind holes while retaining enough lead to start cleanly. Class of fit is 6H. This tap is installed by machinists and precision assembly technicians working in production or toolroom environments.

This tap is suited for small-diameter metric threading in both production machining and precision assembly applications. It performs in blind-hole and through-hole scenarios across a range of workpiece materials including aluminum, gray cast iron, malleable cast iron, spheroidal cast iron, vermicular cast iron, non-ferrous metals, plastics, fiber reinforced plastics, and graphite. The modified bottoming chamfer makes it particularly useful in confined bore depths where a standard taper or plug tap cannot reach full thread depth. Series 20311 from WALTER-PROTOTYP targets consistent thread quality in light-duty and micro-threading applications.

Key Features

• M35 cobalt HSS construction for improved heat resistance over standard HSS in harder workpiece materials
• Modified bottoming chamfer enables threading close to the base of blind holes
• 3-flute straight-flute design supports both blind-hole and through-hole threading
• 6H class of fit for standard metric tolerance threads
• Bright uncoated finish avoids coating buildup in micro-diameter applications
• No coolant-through requirement simplifies setup on standard tapping machines and CNC equipment

Compatibility

Designed for M1.4 x 0.30 metric thread cutting in blind and through-hole applications across aluminum, non-ferrous metals, cast iron grades, plastics, fiber reinforced plastics, and graphite workpieces. Part of WALTER-PROTOTYP Series 20311.

Installation Notes

This tap is installed by machinists using tapping machines, CNC machining centers, or manual tap wrenches with appropriate collet or tap holder adapters for the 2.5 millimeter shank. Ensure the spindle is fully stopped and the workpiece is secured before tool changes. Use a tapping fluid or cutting oil appropriate to the workpiece material to extend tool life and maintain thread quality. Verify pre-drill hole diameter against the M1.4 x 0.30 metric drill chart before tapping to avoid tap breakage in this micro-diameter range.