RUKO STB-HSS-TiN porraspora 3/16"-1/2" (4,8-12,7 mm) TiN-pinnoitettu HSS

Electricians and sheet metal workers use this step drill bit to create clean, burr-free holes in control panels and junction boxes. The TiN-coated HSS body steps from 3/16" to 1/2" in six increments, letting one tool replace a full set of twist drills for thin materials.

Key specifications

• Drill bit type: Step drill bit
• Material: High-speed steel (HSS) with titanium nitride (TiN) coating
• Diameter range: 3/16" - 1/2" (4.8 mm - 12.7 mm)
• Number of steps: 6
• Step increments: 3/16", 1/4", 5/16", 3/8", 7/16", 1/2"
• Shank type: Straight shank, 6 mm diameter
• Total length: 67 mm
• Point angle: 118°
• Flute type: Two-flute spiral
• Self-centering: Yes
• Deburring capability: Yes
• Standard: DIN 1412 C

Why choose it

The TiN coating reduces friction and heat build-up, extending tool life when drilling stainless steel up to 2 mm thick. The two-flute design clears chips efficiently, while the 118° point starts accurately without a center punch.

Ideal use cases

• Enlarging existing holes in sheet metal up to 4 mm thick
• Drilling clean holes in non-ferrous metals, plastics, and thin steel
• Deburring hole edges in one operation

Good to know

Use cutting fluid or coolant for best results. The step drill is not intended for thick plate or hardened steel.