Drill bit 1/4" (6.35 mm) 150 mm Topex 38D502

Twist drill bit Topex 38D502 with a 1/4" (6.35 mm) shank and 150 mm overall length is a straight-fluted drilling accessory intended for general-purpose use. The design provides extended reach for drilling through panels, deep holes and layered materials. It fits standard chucks that accept 1/4" shanks and is suitable for use in both handheld drills and drill presses when longer working depth is required.

Advantages

The drill bit combines a long 150 mm overall length with a commonly used 1/4" (6.35 mm) shank, enabling access to recessed or hard-to-reach drilling points. Its twist-flute geometry ensures efficient chip evacuation and stable cutting action in a range of materials. The shank size provides compatibility with a wide variety of standard drill chucks and quick-change adapters, facilitating fast tool changes and reliable clamping.

Suitable for

• Drilling metal sheets and thin-walled components where extended reach is needed
• Woodworking tasks such as through-holes in panels, laminated boards and furniture parts
• DIY repair and assembly projects requiring longer drill depth or access to confined spaces
• Use with handheld drills and drill presses equipped to accept 1/4" shanks

Key specifications

• Shank diameter: 1/4" (6.35 mm)
• Overall length: 150 mm
• Type: twist drill bit with straight/tapered flutes
• Compatibility: accepts standard 1/4" chucks and quick-change holders
• Typical materials: suitable for general-purpose drilling in metals, wood and common construction materials

How to use

Secure the drill bit in the tool chuck or quick-change adapter, ensuring the shank is fully seated and tightened to prevent slippage. Select an appropriate spindle speed and feed for the material being drilled; use lower speeds and steady feed for metals, and higher speeds for softer woods. Apply cutting fluid or lubricant when drilling metals to reduce heat and extend bit life. Withdraw the bit periodically when drilling deep holes to clear chips and improve cooling.

Usage recommendations

Use eye and hand protection when operating power tools. Match drill speed and lubrication to the work material, and avoid excessive side load to maintain bit concentricity and longevity.