Description
RockHound’s shank adapters for the Secoma Hydrastar 200 and 300 series are engineered to match — and in fatigue life, often outlast — OEM specifications. Available in R32, R38, and T38 thread configurations, each unit is manufactured from 23CrNiMo alloy steel and processed through a full 20-hour carburizing heat treatment cycle, delivering hardened case depth of 1.5–2.0 mm with a core hardness of 38–42 HRC. The result: a rock drill rod shank adapter that stays in service longer and costs meaningfully less per meter drilled.
Features
23CrNiMo Premium Alloy — Higher Ni content (2.75–3.25%) delivers superior low-temperature impact toughness; Mo suppresses temper brittleness under sustained percussion loading. See material comparison →
20-Hour Carburizing Cycle — Case depth reaches 1.5–2.0 mm vs. the industry-standard 0.8 mm from rapid 4–8 hr cycles. Surface hardness: 58–62 HRC. Why this matters →
Fatigue-Optimized Thread Root — R32,R38 & T38 thread profiles are geometrically tuned to reduce reflected stress wave energy, a primary cause of premature thread fracture.
CNC-Precision Spline Geometry — Micron-level tolerance on the drive splines minimizes rotational wear against the chuck sleeve, protecting your drifter’s internal seals.
External Flushing Design — Ensures reliable cuttings evacuation in broken or fractured ground conditions.
100% OEM-Interchangeable — Drop-in replacement; no modifications to your Secoma drifter required.
Specifications
| Product Code | Drifter | Thread | Length (mm) | Diameter (mm) | Weight (kg) |
|---|---|---|---|---|---|
| 468-3848-5154 | Secoma 200, 300 | R32 | 485 | 38 | 3.9 kg |
| 468-3848-5156 | Secoma 200, 300 | R38 | 485 | 38 | 4.2 kg |
| 468-3848-5176 | Secoma 200, 300 | T38 | 485 | 38 | 4.1 kg |
Flushing type: External (TU) | Spline interface: Standard Secoma Hydrastar chuck
Competitor Cross-Reference
| Brand | Applicable Drifter | Thread | Length (mm) | OEM Part No. / Ref. |
|---|---|---|---|---|
| Sandvik | Hydrastar 200/300/X2 | R32 | 485 | 7803-3590-03 |
| Sandvik | Hydrastar 200/300/X2 | R38 | 485 | 7804-3590-03 |
| Sandvik | Hydrastar 200/300/X2 | T38 | 485 | 7304-3590-03 |
| RockHound | Secoma 200, 300 | R32 / R38 / T38 | 485 | 468-3848-51XX |
RockHound parts are geometrically identical to Sandvik OEM references and deliver comparable or superior fatigue life — at 30–50% lower cost per unit. No adapter sourcing from multiple suppliers. One qualified partner, full interchangeability.
Applications
- Underground Hard Rock Mining — Narrow-vein stoping with the Secoma Hydrastar 200’s compact drifter profile demands a shank that absorbs asymmetric lateral loads without galling the chuck.
- Drill-and-Blast Tunneling — In civil infrastructure projects, the T38 configuration transfers peak impact energy more efficiently into competent rock (UCS 130–180 MPa).
- Rock Bolting & Ground Support — The Secoma Quasar and similar bolters rely on shank geometry precision to hold hole diameter tolerances for systematic bolt patterns.
How to Select the Right Shank
- Match your drifter exactly. Secoma 200 and 300 share the same spline geometry; use the product codes above.
- R32 suits general construction and smaller-diameter blast holes where moderate energy transfer is adequate.
- R38 bridges R32 and T38 — a good fit for intermediate-hardness formations.
- T38 is the preferred choice for sustained hard-rock production drilling — its larger thread cross-section handles higher fatigue loading without accelerated root cracking.
- Confirm your flushing circuit (external vs. internal) before ordering — mismatched flushing will shorten drifter seal life regardless of shank quality. Complete selection guide →
Maintenance Guidelines
Field data from RockHound customer callbacks consistently points to one culprit behind early shank failures: inadequate lubrication. Before each shift, confirm that the drifter’s shank lube mist system is delivering oil film to the spline interface — no film means metal-to-metal contact and rapid fretting wear. On thread inspection, use a profile gauge weekly; once flank geometry sharpens noticeably, replace the shank before it damages your rod couplings.
Keep push pressure matched to actual rock strength: blank firing (piston cycling without bit-to-rock contact) generates destructive tensile stress waves that cause characteristic “mushrooming” at the impact face. When you see it, stop — it means energy is reflecting back into the drifter.
Custom Laser Marking
B2B buyers can request logo/brand marking up to 100 × 100 mm at no performance cost.
FAQ
Yes. The Secoma Hydrastar 200 and 300 share the same spline interface geometry. RockHound's 485mm shank adapters (codes 468-3848-5154 / 5156 / 5176) are validated for both models across R32, R38, and T38 thread variants.
Yes. RockHound offers laser marking up to 100 × 100 mm per unit — ideal for distributors and rental fleets. Provide a vector-format logo file and your order quantity to receive a branded sample before bulk production.
Thread root fracture is almost always a fatigue failure, not an overload event. Root causes include: undersized case depth (insufficient ECD), excessive blank firing, mismatched push pressure, or worn couplings transmitting misaligned loads. RockHound's deeper carburizing and optimized thread geometry are specifically designed to arrest micro-crack propagation at this high-stress zone.
Conventional rapid carburizing (4–8 hours) yields a case depth of roughly 0.8 mm — adequate for moderate impact, but prone to spalling in hard-rock applications. RockHound's 20-hour cycle drives carbon diffusion to 1.5–2.0 mm, building a residual compressive stress field that counteracts the tensile stress waves piston impact generates at thread roots.
23CrNiMo's elevated nickel content raises low-temperature impact toughness, which is critical during cold start-up percussion. Chromium homogenizes case hardness through the carburized layer, and molybdenum arrests temper embrittlement during prolonged high-cycle loading. Together, they extend fatigue life well beyond what plain chromium steels deliver in hard-rock top hammer drill systems.