H22 Tapered Drill Rod (Hex 22mm) - Integral Drill Steel

H22 Tapered Drill Rod (Hex 22mm): High-Fatigue Carburized Rock Drill Steel

The H22 Tapered Drill Rod (Hex 22mm) is the most widely used drill steel in the world. Topking H22 rods are manufactured from premium hollow alloy steel and undergo a rigorous Carburization process. This ensures the rod has a hard surface to resist wear and a tough core to absorb the high impact energy from rock drills.

Featuring a standard Hex 22mm x 108mm shank, this rod is the perfect partner for handheld pneumatic rock drills such as YT24, YT27, YT28, and Y19A. It is the go-to solution for granite quarrying, small-scale mining, and tunneling projects.

Selection Guide: H22 vs. H25 Drill Rods

💡 Complete Quarrying Workflow: Drill & Crack

Step 1: Use H22 Rods + Tapered Bits to drill holes fast.

Step 2: Use Topking Expansive Mortar (HSCA) to split the stone blocks silently and safely.

Technical Specifications:

• Product Name: H22 Tapered Drill Rod (Hollow Steel)

• Shank Size: Hex 22mm * 108mm (Standard)

• Taper Degree: 7°, 11°, 12°

• Steel Grade: 95CrMo / Z708 (Premium Drill Steel)

• Available Lengths: 0.6m to 4.8m (Customizable up to 8m)

• Heat Treatment: Full-length Carburization for high fatigue resistance.

DRILL ROD SPECIFICATIONS & STRUCTURE

H22 Tapered Drill Rod FAQs & Maintenance Guide

Q1: What is the main difference between H22 and H25 tapered drill rods?

A: H22 (Hex 22mm) is the global standard for handheld and lightweight air-leg rock drills. H25 (Hex 25mm) is a heavy-duty version providing higher rigidity and anti-bending performance. H25 is preferred for holes deeper than 4 meters or when using high-power machines like the YT29A to minimize energy loss.

Q2: How do I choose between a 7-degree and a 12-degree taper for H22 rods?

A: The 7-degree taper is standard for lighter drills (Y24, Y26) in soft to medium rock. The 11-degree and 12-degree tapers are engineered for high-impact air-leg drills (YT28). A larger taper degree provides a wider contact area, ensuring the drill bit remains securely attached under massive pneumatic stress.

Q3: How can I effectively prevent rod breakage during underground tunneling?

A: Rod breakage is often caused by fatigue. To prevent it, ensure your FY250B line oiler is always functioning to lubricate the rotation. Avoid "dry hammering" (impacting without enough thrust). Expandag H22 rods use a carburization process that creates a flexible core to absorb these shock waves, significantly extending the rod's life.

Q4: What are the technical benefits of Full-length Carburized 95CrMo steel?

A: Carburization diffuses carbon into the surface of the 95CrMo alloy steel, creating a diamond-hard exterior while maintaining a tough inner core. This "hard-shell" prevents surface scratches from developing into cracks, increasing the rod’s fatigue strength by up to 50% compared to standard induction-hardened steels.

Q5: Will these rods fit my standard YT24 or YT28 rock drill?

A: Yes. Our H22 tapered rods feature the industry-standard Hex 22mm x 108mm (4-1/4") shank. This precision-forged shank is specifically designed to fit the rotation sleeves of all major international rock drill brands, ensuring 100% compatibility and efficient power transfer.

Q6: How do I maintain the taper end to prevent drill bits from slipping?

A: The taper end (7°/11°/12°) must be clean and free of rust. Before mounting a bit, wipe the taper end of the H25 or H22 rod. If the taper becomes deformed or "mushroomed" due to excessive wear, it should be trimmed or replaced to prevent the bit from becoming permanently stuck or detaching during blasthole drilling.

Recommended Products:

• Expansive Mortar (HSCA)

• Match with: Tapered Button Bits (Q7/Q8)

• Match with: Hand Held Rock Drills

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