Q738-1122 Tapered Button Bit, 11° Taper

Description

Q738-1122 Tapered Button Bit — 11° Taper

The Q738-1122 is an 11°-taper button bit built with seven spherical tungsten carbide buttons, a 38 mm head diameter and a 22 mm bore. The drop-center face clears cuttings fast and keeps the hole tracking straight, making it a reliable bit for hand-held pneumatic rock drills such as the YT24, YT27 and YT28 in medium-to-hard rock.

Specification

• Model: Q738-1122
• Head diameter: 38 mm
• Button count: 7 spherical tungsten carbide buttons
• Taper angle: 11°
• Bore diameter: 22 mm
• Button shape: spherical tungsten carbide
• Face design: drop center
• Body material: heat-treated alloy steel
• Connection: 11° tapered socket for tapered drill rods
• Compatible rock drills: YT24, YT27, YT28 and similar hand-held / air-leg drills
• Applications: blast hole drilling, mining, tunneling, quarrying

Features

• Seven premium spherical tungsten carbide buttons give balanced cutting coverage and resist wear in abrasive rock.
• Drop-center face improves cuttings evacuation and keeps the bit tracking straight, raising penetration rates.
• Forged, heat-treated alloy steel body for high impact strength and long service life.
• Precision-machined 11° taper socket with 22 mm bore for a secure friction fit on tapered drill rods.
• Optimized flushing channels clear drill cuttings quickly and reduce button wear.

How to read the model number

Q738-1122 follows the RDT coding system: Q = spherical (ball) button bit, 7 = 7 carbide buttons, 38 = 38 mm head diameter, 11 = 11° taper angle, 22 = 22 mm bore diameter.

Frequently asked questions

What does the model number Q738-1122 mean?

In this series, Q stands for a spherical button bit, 7 is the number of tungsten carbide buttons, 38 is the head diameter in millimetres, 11 is the taper angle in degrees, and 22 is the bore diameter in millimetres. The bit fits any drill rod with a matching 11° taper.

Which taper angle should I choose, 11° or 12°?

Match the taper angle to your existing drill rods. The 11° taper is the most common standard for hand-held drills; the 12° taper gives a slightly stiffer socket fit. If you are unsure, send us a photo of your rod end and we will confirm the match.

Can I order other diameters or button shapes?

Yes. Head diameter, button count, button shape (spherical or ballistic) and face design can all be made to order. Send us the diameter, taper angle and rock hardness and we will quote.