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 guarantees secure shank coupling, efficient rotational torque transfer, and exceptional resistance to wear, corrosion, and fatigue—even under high-vibration, high-dust conditions.

Ideal for mining, tunneling, and heavy civil construction applications where reliability and uptime are non-negotiable.

Key Advantages

  • ISO 2768-mK precision-machined internal splines for exact Montabert HC 28 shank engagement
  • AISI 4140 hardened steel (HRC 58–62) with black oxide + wax corrosion protection
  • Zero-play fit design reduces operational vibration by up to 32% vs. standard replacements
  • Validated for continuous duty at 1,800–2,200 rpm and peak torque ≥ 1,450 N·m
  • Direct OEM-equivalent replacement — no adapter or modification required
  • Certified to ISO 9001:2015 manufacturing with full traceability (heat lot documented)

Applications

  • Montabert HC 28 hydraulic rock drills (all serial ranges)
  • Underground mining drilling rigs with HC-series compatibility
  • Tunnel boring support equipment requiring HC 28 shank interface
  • Civil infrastructure projects: bridge foundations, slope stabilization, pile drilling
  • Rental fleet maintenance programs seeking certified OEM-spec spares
  • Emergency field replacement in remote or high-dust environments

Technical Specifications

Part Number86778529
Compatible ModelMontabert HC 28
MaterialAISI 4140 hardened steel (HRC 58–62)
Surface TreatmentBlack oxide + protective wax coating
Spline TypeInternal straight splines (12 teeth, 18.5° pressure angle)
Dimensions (OD × ID × L)Φ62.0 mm × Φ38.1 mm × 85.0 mm (±0.02 mm)
Torque Rating1,450 N·m (continuous), 2,100 N·m (peak)

FAQ

Is this sleeve compatible with all Montabert HC 28 production years?
Yes — validated across HC 28 units manufactured from 2009–2024, including pre- and post-2016 spline geometry revisions.
What’s the typical lead time for bulk orders (50+ units)?
Standard lead time is 5–7 business days ex-warehouse; expedited shipping (2-day air) available for urgent orders.
Does it require special tools or calibration for installation?
No — installs using standard HC 28 torque wrench (1,250–1,350 N·m) and OEM-recommended thread lubricant.
How does its wear life compare to generic alternatives?
Average service life exceeds 1,800 operating hours — ~3.2× longer than non-hardened carbon steel sleeves per independent field audit.

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 24-month warranty and technical support from rock drill specialists.

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