Description
RockHound’s direct-replacement shank adapters for the Montabert HC-series were built around a single discipline: match OEM dimensional tolerances precisely, then outperform OEM service life through superior metallurgy and heat treatment. Whether you’re face-drilling in an underground development heading, anchor-bolting on a cut slope, or running a surface bench in hard granite, these adapters give you the same energy-transmission efficiency the drifter was designed to deliver — without the brand-name markup.
All three models HC25, HC40, and HC50, which are manufactured from 23CrNiMo alloy steel, the same grade used in premium European drill-string components, subjected to a 20-hour deep carburizing cycle that produces a hard, fatigue-resistant case over a tough, impact-absorbing core. The result is a shank adapter that doesn’t chip at the splines, doesn’t crack at the collar, and doesn’t hand you a fractured shank on a Friday afternoon.
Each unit is precision-machined on CNC turning centers, 100% dimensionally inspected, and available with custom logo marking (max imprint area 100 × 100 mm) for fleet or rental customers who want clear ownership identification in the field.
Features
| Feature | Description |
|---|---|
| 23CrNiMo Alloy Steel | Chrome for wear resistance, Nickel for impact toughness, Molybdenum to prevent temper brittleness. Superior combined strength and durability. |
| 20-Hour Deep Carburizing | 58–62 HRC hardened surface with tough 38–42 HRC core. Exceptional resistance to wear and impact fatigue. |
| CNC-Precision Spline & Thread | Tight-tolerance machining on shank and thread for minimal vibration, reduced chuck wear, and maximum energy transfer. |
| Full OEM Traceability | Dimensionally verified against Montabert master gauges. Cross-referenced to original part numbers. |
| Custom Logo Imprinting | Available for fleet management and anti-theft. Max area: 100 × 100 mm. |
| Worldwide Direct Shipping | Factory-direct B2B pricing with no distributor margin. From single unit to full pallet orders. |
Specifications
| Model Compatibility | Length (mm) | Front Ø (mm) | Thread Type | RockHound Part No. | Weight (kg) |
|---|---|---|---|---|---|
| Montabert HC25 | 205 | 45 | R32 | RH-468-4520-9153 | 2.1 |
| Montabert HC25 | 205 | 45 | R32 | RH-468-4520-9154 | 2.0 |
| Montabert HC40 | 275 | 45 | R32 | RH-468-4527-9054 | 3.6 |
| Montabert HC50 | 386 | 38 | R38 | RH-468-3838-9156 | 3.5 |
| Montabert HC50 | 386 | 38 | T38 | RH-486-3838-9176 | 3.5 |
Brand Comparison
| Parameter | Montabert OEM (Original) | Generic CN Supplier (Typical) | RockHound (rhdrill.com) |
|---|---|---|---|
| Steel Grade | Proprietary (approx. 23CrNiMo class) | 42CrMo or unspecified | 23CrNiMo (certified) |
| Carburizing Process | Deep case (proprietary) | Standard 8–12 hr | 20-hour deep carburizing |
| Case Hardness | ~60 HRC | 56–58 HRC (estimated) | 58–62 HRC |
| CNC Machining | Yes | Varies by supplier | Yes (all critical surfaces) |
| Dimensional Traceability | Full OEM standard | Often undocumented | Cross-referenced to OEM part no. |
| Typical Unit Price | $$$ (OEM premium) | $ (low cost, variable quality) | $$ (factory-direct, consistent quality) |
| Custom Branding | Not available (OEM parts) | Rarely available | ✅ Up to 100 × 100 mm logo |
| B2B Direct Supply | Through certified dealers | Through trading companies | ✅ Factory-direct |
| Drop-in Fit Guarantee | Yes | Not guaranteed | ✅ 100% OEM-interchangeable |
The RockHound position: You don’t need to pay OEM prices to get OEM-grade performance. But you also can’t afford to run the risk of an unverified generic component failing mid-round. RockHound occupies the space between those two options — documented steel grade, documented process, documented dimensions, at factory-direct pricing.
Applications
Shank adapters for the Montabert HC25, HC40, and HC50 are designed for anywhere these compact-to-mid-class hydraulic drifters are deployed:
Underground Mining & Development
Face drilling in development headings, production blasting rounds, and cross-cuts. The HC25’s compact form factor and HC50’s higher power output cover everything from small-section drives to full-face tunnel rounds.
Rock Bolt & Cable Bolt Installation
Both mechanical and resin bolt installation place high bending loads on the shank adapter during collaring. The 23CrNiMo core’s toughness is particularly valuable in these conditions.
Surface Bench Drilling Quarry benches, open-cut mining, and aggregate production drilling where the HC40 and HC50 are commonly carrier-mounted.
Civil Engineering & Construction Foundation anchoring, slope stabilisation, road-cut drilling, and trench preparation.
Drill & Split (Non-Blasting) Operations Hydraulic rock-splitting applications in urban or blasting-restricted environments where precise hole placement is critical.
How to Choose The Right Montabert HC25/40/50 Shank
Selecting the correct shank adapter for a Montabert HC-series drifter comes down to four matching criteria — get all four right, and the adapter will perform as intended; miss any one of them, and you’ll either damage the drifter, the drill rod, or both.
1. Match the Drifter Model Exactly The shank profile — overall length, shank diameter, spline or hex geometry — is designed to a specific chuck interface. An HC25 adapter will not seat correctly in an HC40 chuck. Refer to the specification table above and confirm your drifter model before ordering.
2. Match the Front Thread to Your Drill Rod System
- R32 (HC25, HC40): Used with the R32 top-hammer rod system. Standard choice for hole diameters of 32–51 mm.
- R38 (HC50): Suits the R38 rod system, typically 45–64 mm holes.
- T38 (HC50 alternate): Reverse-taper thread profile used where T38 drill rods are already on site. T-threads and R-threads are not interchangeable — match whatever rod system you’re running.
3. Consider Drilling Direction and Application Male-threaded shank adapters (as supplied here) are optimal for face drilling, tunnelling, and extension drilling where bending stresses from collar offset are present. Female configurations are used in space-limited rig setups; contact RockHound if you need a female-thread variant.
4. Consider Length in Multi-Rod Extension Drilling If you’re drilling longer rounds with extension rods, adapter length affects the minimum collaring clearance between the drifter and the drill-steel guide. Standard OEM-matched lengths are shown in the specification table.
Full selection guide: Shank Adapter — Function, Work, Choose & Maintenance
How to Maintenance Shank Adapter
A shank adapter is a consumable wear item. However, poor maintenance can cut its service life in half long before natural wear sets in. Follow these critical practices to maximize your tool life:
| Maintenance Item | Recommendation & Risk |
|---|---|
| Daily: Pre-Operational Inspection |
• Visual Check: Inspect splines/hex profiles for fretting, cracks, or deformation. • Thread Check: Feel front threads for roughness or chipped crests — replace immediately if damaged. Risk: Damaged shank can ruin chuck jaws, drill rods, or cause mid-hole fracture. |
| Daily: Lubrication |
• Apply OEM-specified lubricant (EP gear oil or dedicated rock drill oil) to chuck and shank surfaces. Risk: Dry running causes severe spline fretting within hours. |
| Periodic: Torque & Wear Monitoring |
• Check chuck retaining nut torque per drifter manual. • Monitor collar length — replace adapter once wear limit is reached. Risk: Loose components increase bending fatigue and reduce impact energy transfer. |
| Storage Best Practices |
• Store horizontally on rack — never vertically on thread end. • Coat threads and splines with rust inhibitor before long-term storage. |
Related Products
FAQ
Yes. RockHound HC-series shank adapters are 100% drop-in replacements engineered to Montabert OEM specifications. They require no modifications and cross-reference with the following OEM part numbers:
Montabert Parts: 468-4520-9153, 468-4520-9154, 468-4527-9054, 468-3838-9156, 486-3838-9176.
Compatible Drifters: Montabert HC25, HC40, and HC50.
The prefixes indicate the thread profile, while the numbers state the nominal diameter in millimeters. They are not interchangeable:
R-Threads (R32, R38): Rounded, buttress-based profile. (HC25 and HC40 use R32; HC50 uses R38).
T-Threads (T38): Straighter, steeply-flanked taper profile for heavy-duty drilling. (HC50 option).
Compatibility and nominal hole ranges are broken down below:
| Drifter Model | Thread Type | Length | Nominal Hole Diameter Range | Primary Applications |
| Montabert HC25 | R32 | 205 mm | 32–51 mm | Face drilling, bolting, small-section development |
| Montabert HC40 | R32 | 275 mm | 38–64 mm | Medium development, bench drilling |
| Montabert HC50 | R38 / T38 | 386 mm | 45–76 mm | Medium bench, underground production, bolting |
Under well-maintained conditions in medium-hard rock, a high-quality shank adapter on an HC50 drifter typically lasts 300–600 operating hours.
Life Reducers (<100 hours): Poor lubrication, misaligned feed, or worn chuck jaws.
Retirement Criteria: Replace immediately if you observe visible spline fretting, collar wear reaching the minimum mark, or surface cracks.
Yes. We offer custom logo imprinting (maximum marking area: 100 × 100 mm)—ideal for rental fleet tracking or large-site asset management. Please submit your vector artwork file with your inquiry.