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

86732575 Spline Shank & Ring for Montabert HC25 Drills

The 86732575 Spline Shank + Ring Assembly is a workhorse part made for the Montabert HC25 rock drill when paired with an FT160C air leg. It takes the hammering impact and rotation from the drill and passes it straight through to the bit. The shank is machined from hardened steel—built to take a beating without deforming—and the splines are cut tight so power transfer stays efficient. The ring keeps everything lined up, cutting down on vibration that normally wears out surrounding parts faster. If your work is underground mining, tunnel rounds, or heavy civil drilling, this assembly helps the drill run smoother and last longer between rebuilds.

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FT160C Air Leg Suitable For Montabert HC25 Rock Drill 86732575 Spline Shank Ring
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FT160C Air Leg Suitable For Montabert HC25 Rock Drill 86732575 Spline Shank Ring detail image 1
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FT160C Air Leg Suitable For Montabert HC25 Rock Drill 86732575 Spline Shank Ring detail image 7
Highlights
Key Advantages
  • Splines are machined to a tight tolerance so torque doesn't get wasted in slack—transfers rotation directly from the rifle bar to the bit.
  • Through-hardened steel isn't just surface tough; it resists mushrooming and spline twist even after thousands of rod changes in hard rock.
  • The ring isn't an afterthought—it keeps the shank centered under load, which cuts down side-load wear on the chuck and front head bushings.
  • Slips right into an HC25 on an FT160C leg with no mods—no shimming, no grinding, no surprises.
  • We've seen these hold up in abrasive conditions where standard shanks start showing spline wear in half the time.
Use Cases
Applications
  • Development drifting and production drilling in underground metal/non-metal mines
  • Tunnel face drilling and rock bolting in civil tunneling projects
  • Foundation drilling and micropile installation in urban construction
  • Quarry bench drilling for aggregate and dimensional stone
  • Demolition and secondary breaking in heavy civil jobs
  • Geothermal and water well drilling in hard rock formations
Specs
Technical Specifications
Part Number86732575
Compatible Rock DrillMontabert HC25
Compatible Air LegFT160C
MaterialHardened alloy steel, through-hardened
Shank TypeSpline drive with integrated ring
Hardness ProfileCore hardness 40-45 HRC; spline area locally induction hardened for wear resistance
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 a Montabert HC28 or HC40?
No, this assembly is specific to the HC25. Shank diameter, spline count, and ring dimensions are different on other models. Using it in an HC28 or HC40 will cause fitment issues or early failure. Check your drill's parts book or give us a call with your serial number to double-check.
What comes in the box?
One spline shank and one ring. Part number 86732575 covers both pieces. No need to order them separately.
How fast can I get one on site?
Stock parts normally go out within 1-2 business days. If we have stock in a warehouse near your region, you might get it in 3-5 days. Urgent orders can ship same day if placed before noon local time—call or email for a live inventory check.
I'm using an FT160 air leg—any difference?
The FT160C is the common air leg paired with the HC25. If your leg is an older FT160 (no 'C'), the interface is usually identical, but confirm the leg's mounting specs and thrust bushing dimensions. When in doubt, send us a photo of the leg tag.
When should I pull the shank for inspection?
Pull it every 30-40 hours of hammer time in hard rock, or sooner if you notice increased vibration, loss of rotation speed, or difficulty coupling rods. Look for steps worn into the splines or a flared striking end. Catching it early saves the chuck and piston.
Is this an OEM Montabert part or aftermarket?
It's a premium aftermarket replacement. We hold the material specs and heat treat to match or exceed the OEM's requirements. The steel grade and hardness range are verified with batch testing, and dimensional checks are done on every run.
Stock
Check Stock & Get a Quote
Tell us where you're located and how many you need. We'll get back with pricing, real-time stock, and delivery times—usually within a couple of hours during business days.
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