RUKO HGB-DIN352-HSS-60°-5/16 UNC Bottoming Tap

Precision-ground HSS bottoming tap for UNC 5/16 inch threads, DIN 352 compliant, with a 60° thread angle and 18 TPI for clean, accurate internal threading in unalloyed and low-alloyed steels.

Overview

The RUKO HGB-DIN352-HSS-60°-5/16 is a bottoming tap (Fertigschneider) designed to cut full threads to the bottom of blind holes. Manufactured from high-speed steel, it offers durability and sharpness for general-purpose threading tasks. The tap features a nominal diameter of 5/16 inch (7.938 mm), 18 threads per inch (pitch 1.411 mm), and a thread tolerance class of 2B. With four flutes and a right-hand cutting direction, it ensures efficient chip evacuation and smooth operation.

What stands out

• Bottoming tap geometry allows threading close to the bottom of blind holes.
• HSS material provides good wear resistance and cutting performance.
• DIN 352 standard ensures dimensional compatibility with common holders.
• Bright surface treatment reduces friction and improves chip flow.

Technical details

• Thread Type: UNC (Unified National Coarse)
• Nominal Diameter: 5/16 inch (7.938 mm)
• Threads Per Inch (TPI): 18
• Pitch: 1.411 mm
• Standard: DIN 352
• Material: HSS (High-Speed Steel)
• Thread Angle: 60°
• Tap Type: Bottoming Tap (Fertigschneider)
• Overall Length (L1): 70 mm
• Thread Length (L2): 22 mm
• Shank Diameter (d2): 6.3 mm
• Square Size (k): 4.9 mm
• Number of Flutes: 4
• Thread Tolerance Class: 2B
• Cutting Direction: Right Hand
• Application Material: General purpose for unalloyed and low-alloyed steels
• Surface Treatment: Bright

Our verdict

A reliable bottoming tap for machinists needing precise UNC threads in blind holes. Its HSS construction and DIN 352 compliance make it a solid choice for workshop use.