H25 Tapered Drill Rod (Hex 25mm) - Heavy Duty Drill Steel

H25 Tapered Drill Rod (Hex 25mm): High-Rigidity Carburized Drill Steel

The H25 Tapered Drill Rod (Hex 25mm) is a heavy-duty drill steel designed for high-impact drilling. Unlike standard rods, Topking H25 rods undergo a special Carburization (Heat Treatment) process, which hardens the surface for wear resistance while keeping the core flexible to absorb shock waves.

This rod features a standard Hex 22mm or 25mm shank, making it the perfect match for powerful pneumatic rock drills like YT28, YT29A, and ETS82. It is widely used in underground mining and tunneling where deep holes and high durability are required.

💡 Mining Cycle Solution: Drill & Crack

Step 1: Use H25 Rods + Q7 Bits to drill deep holes efficiently.

Step 2: Use Topking Expansive Mortar (HSCA) to split the rock block safely and reduce waste.

Comparison Matrix: H25 vs. H22 Drill Rods

Technical Specifications:

• Steel Grade: High Carbon Alloy Steel (Carburized 95CrMo)

• Shank Size: Hex 25mm * 108mm / 159mm (Customizable)

• Taper Degree: 7°, 11°, 12°

• Available Lengths: 0.6m - 8.0m (Standard & Custom)

• Process: Full-length Carburization for maximum fatigue life.

• Application: Granite, Basalt, and Hard Ore Mining.

TAPERED DRILL ROD DIMENSIONS

H25 Tapered Drill Rod FAQs & Engineering Support

Q1: Why should I use H25 drill rods instead of H22 for holes deeper than 3 meters?

A: H25 (Hex 25mm) features a larger cross-sectional area, providing significantly higher rigidity. This extra stiffness effectively minimizes bending vibrations in deep-hole applications, resulting in straighter blastholes and preventing the drill bits from uneven carbide wear or jamming.

Q2: How does the full-length Carburization process increase the rod's service life?

A: Our carburizing heat treatment creates a high-carbon "hard shell" on the 95CrMo alloy steel surface. This shell resists external abrasion and micro-cracks, while the core remains ductile to absorb the high-frequency 78J+ shock waves from pneumatic rock drills, drastically reducing the risk of rod fatigue breakage.

Q3: Which rock drill models are the best match for H25 tapered rods?

A: H25 rods are engineered for high-power air-leg drills such as the YT28, YT29A, and ETS82. These heavy-duty machines deliver the necessary impact energy to fully utilize the H25's superior energy transmission efficiency in hard granite and basalt mining.

Q4: Why does the shank end of a drill rod sometimes break, and how do you prevent it?

A: Shank breakage is usually caused by poor fit in the rock drill's rotation sleeve or improper heat treatment. Expandag H25 rods use precision-forged shanks (Hex 22x108mm or 25x159mm) that are specifically induction-hardened to prevent "mushrooming" and snap-offs under high-torque conditions.

Q5: How do I choose the correct taper degree (7°, 11°, or 12°) for my mining project?

A: The choice depends on the impact energy of your drill. 7-degree is standard for light work, while 11° and 12° tapers are required for high-power heavy-duty drilling. A wider taper angle provides a larger contact area, which prevents the bit from slipping or becoming permanently wedged on the H25 rod during intense operation.

Q6: What is the maximum recommended drilling length for H25 tapered steel?

A: While we offer lengths up to 8.0 meters, the most efficient "sweet spot" for H25 rods in underground mining is between 2.4m and 4.8m. This range balances optimal penetration speed with ease of handling for the operator when using a standard FT160A air-leg support.

Recommended Products:

• Expansive Mortar (HSCA)

• Match with: Tapered Button Bits

• Match with: Rock Drills Machine

Get H25 Rods Price & Catalog