Indexable Drill Bits – U-Drills with Replaceable Inserts

Indexable U-Drills (also known as indexable drill bits) are the most cost-effective solution for drilling medium to large diameter holes (typically Ø12–50 mm) in high-volume production. Unlike solid carbide drills, the cutting edges are replaceable carbide inserts, resulting in extremely low cost per hole and easy maintenance.

Amony offers U-Drills in 2D, 3D, 4D and 5D lengths, compatible with two popular insert types: SPGT/SPMG (high-feed, high stability) and WCMT (general-purpose, balanced cutting force). These drills are widely used in steel, cast iron, stainless steel, alloy steel, and non-ferrous materials.

Key Advantages of Indexable U-Drills

• Lowest cost per hole – only replace inserts, not the whole drill body

• Large diameter range (12–50 mm and above with extensions)

• High metal removal rate (MRR) – suitable for roughing and semi-finishing

• Through-tool coolant channels for excellent chip evacuation and heat control

• Adjustable insert positioning for size compensation and wear compensation

When to Choose Indexable U-Drills Over Solid Carbide Drills

Indexable U-Drills are preferred when:

• Hole diameter > 20 mm

• Hole depth ≤ 5×D

• High-volume production or roughing operations

• Machine power allows high feed rates

• Cost per hole is a primary concern

For precision holes, deep holes (>8×D), or very small diameters (<12 mm="">

Insert Type Comparison

All Amony indexable U-Drills use high-rigidity tool bodies with through-coolant capability and accept industry-standard inserts. Custom diameters and lengths are available upon request.