Kelly Bar Guide Wear Strip (Cross-Ref: 218097.97665)
Compliance & Legal Disclaimer: All manufacturer names, model numbers, part numbers (e.g., BAUER® 218097.97665), and descriptions are utilized strictly for cross-reference, identification, and compatibility verification. All components offered are premium aftermarket replacement parts engineered to match or exceed original specifications and are not OEM products unless explicitly identified as such.
Protecting Kelly Bar Keyways from Abrasive Wear
The interface between the rotary drive sleeve and the telescopic Kelly bar absorbs heavy cyclic torque and axial thrust. When sliding guide plates degrade, metal-to-metal contact accelerates wear on Kelly drive ribs, leading to expensive weld overlays and structural realignment.
Our aftermarket wear strip, engineered to replace 218097.97665, provides high impact absorption and self-lubricating wear resistance. Available in both ultra-high molecular weight polymer (UHMW-PE 1000) and engineered aluminum bronze alloys, it protects Kelly bars while lowering scheduled maintenance costs.
Technical Specifications & Material Benchmarks
| Specification Metric | OEM Reference (218097.97665) | Aftermarket Polymer (UHMW-PE) | Aftermarket Bronze Alloy (Optional) |
|---|---|---|---|
| Material Base | Engineering Polymer / Alloy | UHMW-PE 1000 (MW ≥ 5×106 g/mol) | CuAl10Fe3Mn2 Cast Aluminum Bronze |
| Dynamic Friction (μ) | 0.15–0.20 | 0.10–0.12 (Self-lubricating) | 0.18–0.22 (Greased) |
| Charpy Impact Strength | ≥ 100 kJ/m² | ≥ 130 kJ/m² (ISO 11542-2) | ≥ 20 J |
| Compressive Yield | ≥ 25 MPa | ≥ 28 MPa (ISO 604) | ≥ 280 MPa |
| Shore D / Brinell Hardness | 62–66 Shore D | 65 ± 2 Shore D | HBW 150–180 |
| Application Scope | BG Series Kelly Guide | Standard & Abrasive Soil Drilling | Severe Hard Rock & High-Torque Coring |
Manufacturing Standards & Machining Accuracy
- CNC Machining: Milled on 5-axis CNC machining centers from virgin, stress-relieved plates to eliminate thermal warping and maintain bolt-hole center distances within ±0.15 mm.
- Beveled Edge Profiles: Chamfered entry and exit profiles prevent edge snagging during rapid Kelly bar telescoping.
- Abrasion Resistance Testing: Evaluated under ASTM G65 dry sand/rubber wheel abrasion tests, demonstrating up to 20% higher volume retention compared to standard industrial nylon grades.
Refurbishment & Field Replacement Protocol
- Clearance Measurement: Measure the gap between the guide plate and Kelly bar drive key. Replace the wear strip if radial play exceeds 3.0 mm.
- Backplate Preparation: Scrape off accumulated slurry and grease from the guide frame bracket. Inspect the mounting surfaces for planarity before fitting new strips.
- Fastener Securing: Use Grade 10.9 countersunk fasteners. Apply medium-strength threadlocker and torque to the recommended engineering limit to prevent fastener back-out under vibration.
Frequently Asked Questions (FAQ)
Q: Can this wear strip be installed without on-site modifications?
A: Yes. The strip is CNC-machined to match the bolt patterns, countersink depths, and channel dimensions of original 218097.97665 wear components for direct drop-in assembly.
Q: When should our workshop choose bronze over UHMW-PE wear strips?
A: Standard UHMW-PE strips are ideal for normal and abrasive soil drilling due to their low friction. Bronze alloy strips are recommended for continuous high-torque rock drilling with heavy lateral bending loads.
Q: How does the material formulation protect the Kelly bar steel keys?
A: The polymer formulation acts as a sacrificial wear layer. It absorbs abrasive slurry particles into its surface matrix without embedding sharp grit, preventing direct metal galling against the 25CrMo4 / 30CrNiMo drive keys.