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FT160C Air Leg Suitable For Montabert HC25 Rock Drill 86732575 Spline Shank Ring

A shank assembly that actually lasts in hard rock

The 86732575 Spline Shank + Ring Assembly is a straight swap for the Montabert HC25 rock drill and works with the FT160C air leg. It's built to move impact energy and rotation into the bit without slop or vibration eating your drill internals. The steel is hardened through and through—not just surface treated—so it holds shape under constant pounding in mine headings, tunnel faces, and heavy civil jobs. The ring isn't an afterthought; it locks alignment and cuts lateral play that normally chews up seals and bearings.

FT160C Air Leg Suitable For Montabert HC25 Rock Drill 86732575 Spline Shank Ring
#196
Highlights
Key Advantages
  • Through-hardened steel, not case-hardened—resists mushrooming and cracking even in granite or hard sandstone
  • Splines are ground, not just milled, to match HC25 drive geometry and avoid torque slip or fretting
  • Stabilizing ring clamps the shank path, dropping side-to-side movement that wears front heads and piston guides
  • One-piece ring design can't walk loose under high-frequency vibration—common issue with two-piece retainers
  • Tested on FT160C air leg setups in 12-hour shift cycles; no premature step wear on shank shoulders
Use Cases
Applications
  • Transferring rotation and impact from the HC25 drifter straight to the rod—no adapter plate needed
  • Keeping the shank centered inside the drill housing when the air leg takes side load on uneven ground
  • Cutting downtime in production drilling: fewer shank changes because the ring absorbs alignment shock
  • Underground headings where water and muck constantly wash over the assembly—corrosion-resistant alloy chosen for wet drilling
  • Bench drilling with FT160C leg where feed force varies; ring prevents binding on retraction strokes
Specs
Technical Specifications
Part Number86732575
Rock Drill FitMontabert HC25
Air Leg FitFT160C
MaterialThrough-hardened alloy steel (core hardness 40-44 HRC, surface 56-60 HRC)
AssemblySolid spline shank + one-piece retaining ring
What It DoesPasses impact + rotation, keeps shank aligned, knocks down vibration before it reaches the drill body
Spline TypeInvolute spline, ground finish, 16-tooth standard for HC25
Details
Detailed Description

The Spline Shank + Ring Assembly (Part Number 86732575) is a robust and precisely engineered component set designed specifically for the Montabert HC25 rock drill. This assembly plays a crucial role in the efficient transfer of impact energy and rotational torque from the rock drill to the drill bit, ensuring optimal performance in demanding drilling environments. Below is a detailed description:

Description

The Spline Shank is crafted from high-strength, hardened steel, featuring precision-machined splines to provide a secure connection with the drill's drive system. The accompanying Ring enhances stability and alignment, ensuring smooth operation and reduced wear on associated components.

This assembly is designed to endure high-impact forces, rotational stress, and extreme working conditions typically encountered in mining, tunneling, and construction applications. The combination of the spline shank and the guide ring ensures effective energy transfer, minimizes vibration, and protects critical internal components from premature wear.

Key Features

  1. Durable Materials: Both the spline shank and the ring are made of hardened steel or a specialized alloy to resist wear, impact, and deformation under heavy-duty use.

  2. Precision Splines: Machined for a perfect fit with the rock drill’s internal drive, ensuring efficient torque transfer and smooth operation.

  3. Stabilizing Ring: Provides additional support and alignment for the spline shank, reducing vibration and protecting surrounding components.

  4. Impact and Wear Resistance: Designed to withstand repeated high-energy impacts and abrasive conditions, extending the lifespan of the assembly.

  5. Compatibility: Specifically engineered for the Montabert HC25 rock drill, ensuring seamless integration and optimal performance.

Applications

  • Energy Transfer: Facilitates the transmission of impact and rotational energy from the drill mechanism to the drill bit.
  • Shank Alignment: Maintains proper alignment of the shank within the drill housing, reducing wear and operational stress.
  • Component Protection: Prevents excessive vibration and misalignment, protecting the drill’s internal mechanisms.

Introduction

The 86732575 Spline Shank + Ring Assembly is essential for maintaining the performance and reliability of the Montabert HC25 rock drill. By ensuring efficient energy transfer and proper alignment, this assembly supports high drilling efficiency while minimizing wear on critical components.

The durable construction of the spline shank and ring is tailored to withstand the harsh conditions of rock drilling, offering exceptional reliability and reduced maintenance needs. This assembly is indispensable for operators seeking to optimize the lifespan and performance of their HC25 rock drill.

Conclusion

The Spline Shank + Ring Assembly (86732575) is a high-quality, durable solution for the Montabert HC25 rock drill, ensuring smooth and efficient drilling operations. With its precision engineering, wear resistance, and robust design, this assembly is a key component in maximizing the productivity and longevity of the HC25 in even the most challenging drilling environments.

FAQ
FAQ
Will this fit my Montabert HC28 or HC40?
No—it's machined strictly for HC25 spline and shank diameter. HC28/HC40 use different drive geometry. If you're not sure, grab the serial off your drill and we'll confirm.
We run FT160C legs—does the ring interfere with the leg clamp?
No interference. The ring sits inside the front head bore; the leg clamp attaches externally. We've run this exact setup underground with no clearance issues.
What's the expected life compared to OEM?
Depends entirely on your ground and air pressure, but most crews get 80–90% of OEM life at roughly 60% of the cost. The ring usually outlasts two shanks.
Can I buy just the ring or just the shank?
We sell the assembly complete because the ring seats against a shoulder on the shank that wears as a set. Mixing new and used parts almost always causes early failure.
How fast can you get this to a mine site in Nevada?
We ship from Salt Lake City—UPS or FedEx ground is next day to most Nevada operations. Air freight for same-day if you're down and losing production.
Stock
Check Stock & Get a Quote
Tell us how many you need and where you're drilling. We'll get you a quote with actual ship times—no bots, no forms that disappear into a black hole.