Home / Rock Drill Parts / 86778529 Splined Nut Shank Spline Sleeve Suitable For Montabert HC 28 Rock Drill

86778529 Splined Nut Shank Spline Sleeve Suitable For Montabert HC 28 Rock Drill

OEM-Spec Spline Sleeve for Montabert HC 28 — Torque-Optimized • Wear-Resistant • Drop-In Replacement

High-strength 86778529 splined nut shank sleeve engineered exclusively for Montabert HC 28 rock drills. Precision-machined from hardened alloy steel with tight-tolerance internal splines, this bushing delivers reliable torque transfer, exceptional wear/corrosion resistance, and secure shank coupling — reducing vibration and extending tool life in demanding underground, quarry, and civil construction applications.

Manufactured to original equipment specifications, it features heat-treated surfaces and strict dimensional control (±0.01 mm) for guaranteed compatibility and performance consistency.

Key Advantages

  • Precision-ground internal splines matching Montabert HC 28 shank geometry for zero-slip torque transmission
  • AISI 4140 hardened steel (HRC 58–62) with black oxide + anti-corrosion coating
  • ISO 2768-mK tolerance class ensures vibration-free fit and extended mating component life
  • Drop-in replacement — no modification or recalibration required
  • Validated for continuous high-torque operation up to 1,200 N·m and 300 rpm
  • Traceable batch documentation & 100% dimensional inspection included

Applications

  • Montabert HC 28 hydraulic rock drills (primary application)
  • Underground mining drilling rigs requiring high-torque shank coupling
  • Tunnel boring support drilling systems with abrasive dust exposure
  • Quarry and civil construction blast-hole drilling operations
  • Retrofit upgrades for legacy HC 28 units seeking improved wear life

Technical Specifications

Part Number86778529
Compatible ModelMontabert HC 28
MaterialAISI 4140 hardened steel (HRC 58–62)
Surface TreatmentBlack oxide + corrosion-inhibiting sealant
Spline TypeInternal straight splines (12 teeth, 18° pressure angle)
Tolerance ClassISO 2768-mK
Max Operating Torque1,200 N·m

FAQ

Is this sleeve a direct OEM replacement for Montabert HC 28?
Yes — dimensionally and functionally identical to Montabert’s original 86778529 spline sleeve, including spline profile, hardness, and surface finish.
What is the typical lead time for bulk orders?
Standard lead time is 5–7 business days for quantities ≤50 pcs; expedited shipping available. Larger batches (≥200 pcs) require 12–15 days with confirmed PO.
Does it require special tools or calibration during installation?
No — installs using standard HC 28 maintenance procedures and factory-recommended torque specs (185 ±5 N·m). No re-calibration needed.
How does its wear life compare to standard carbon steel sleeves?
Up to 3.2× longer service life in abrasive conditions due to hardened core + corrosion-resistant surface treatment.

Detailed Description

The shank spline sleeve, also known as the spline bushing, is a key component in rock drills, including Montabert models, designed to facilitate the transfer of rotational torque from the drill’s drive mechanism to the drill shank. It plays a critical role in the effective operation of the rock drill by ensuring a secure connection between the shank and the rotating parts of the drill. Below is a detailed description and introduction to the shank spline sleeve:

Description

The shank spline sleeve for Montabert rock drills is typically made from durable, wear-resistant materials such as hardened steel or high-grade alloys. This component is designed with internal splines that match the external splines of the drill shank, allowing the transmission of rotational forces from the drill motor to the drill bit.

The spline sleeve is engineered to endure the heavy torque and rotational forces exerted during drilling operations. Its precise fit ensures smooth power transmission and minimizes wear on both the sleeve and the shank. Additionally, the surface of the spline sleeve may be treated with coatings or heat treatments to enhance its resistance to wear, corrosion, and fatigue.

Key Features

  1. Efficient Power Transmission: The internal splines of the sleeve are designed to match the shank, allowing for the efficient transfer of rotational force from the drill motor to the bit, enabling effective drilling performance.
  2. Durable Construction: Made from high-strength materials such as hardened steel, the spline sleeve is built to withstand high levels of stress and torque, providing long-lasting durability.
  3. Wear Resistance: The sleeve is treated with surface coatings or heat treatments to enhance its resistance to wear and corrosion, ensuring it maintains its performance over extended use.
  4. Precise Fit: The internal and external dimensions of the spline sleeve are precisely machined to ensure a tight, reliable fit with the drill shank, reducing vibration and wear during operation.
  5. Easy Replacement: The design of the spline sleeve allows for straightforward installation and replacement, minimizing downtime and making maintenance easier.

Introduction

The shank spline sleeve is an essential component in the power transmission system of Montabert rock drills, ensuring that the rotational force generated by the drill motor is effectively transferred to the drill bit. Its durable construction and precise engineering are crucial for maintaining the efficiency and reliability of the drill, particularly in demanding environments like mining, construction, and tunneling.

By securely holding the shank in place and facilitating smooth power transmission, the spline sleeve helps to reduce wear on other components, extend the life of the drill, and improve the overall drilling process. Its resistance to wear and corrosion also ensures that it can perform reliably in harsh conditions where dust, moisture, and other environmental factors are present.

In summary, the shank spline sleeve is a critical part of Montabert rock drills, designed for efficient torque transmission, durability, and ease of maintenance. Its robust design and wear-resistant properties make it indispensable for ensuring optimal drilling performance and equipment longevity.

Ensure Uninterrupted Drilling Performance

Order certified 86778529 spline sleeves today — backed by ISO 9001 quality assurance and 12-month functional warranty.

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