Key Features
Application Rotary foundation drilling, earth auger, drill bucket for soil, sand and soft rock formation.
B85/2 • 38mm OD / 30mm ID • Heavy-Duty Alloy Steel with Embedded Tungsten Carbide Beads
The B85/2 Bullet Tooth Holder is an engineered solution for rotary foundation drilling in demanding soil, sand, and soft rock formations. Designed for direct welding onto auger flights or drill buckets, it delivers exceptional wear resistance and structural integrity under high-torque, high-impact conditions — where standard holders fail prematurely.
Engineered for contractors who prioritize uptime over replacement cycles, this holder extends bullet tooth service life by up to 40% compared to conventional designs — reducing downtime, labor costs, and unplanned maintenance across multi-shift operations.
Precision-embedded WC beads (17.5–22mm) form a continuous abrasion-resistant zone on the outer surface — not just at edges — significantly extending service life in abrasive soils and weathered rock.
Hot-forged from premium 42CrMo alloy steel ensures uniform grain structure, superior tensile strength (>900 MPa), and fatigue resistance — critical for sustained heavy-load drilling cycles.
Optimized 38mm OD / 30mm ID geometry ensures perfect fitment with industry-standard bullet teeth (B47K22H, 3050/3055/3060 series) and enables rapid, repeatable welding installation on auger flights or bucket walls.
Primary application for CFA and rotary bored piles in urban infrastructure projects — withstands repeated impact loading and lateral stress during deep-hole excavation.
Direct integration into earth augers for utility pole foundations, wind turbine bases, and geotechnical sampling — optimized for soil, clay, gravel, and decomposed granite.
Proven performance in fractured limestone, marl, shale, and highly compacted glacial till — where carbide retention and body toughness prevent chipping and cracking.
| Parameter | Value |
|---|---|
| Model | B85/2 |
| Outer Diameter | 38 mm |
| Inner Bore Diameter | 30 mm |
| Compatible Teeth | B47K22H, 3050 / 3055 / 3060 series |
| Base Material | 42CrMo alloy steel (forged) |
| Wear Protection | Embedded tungsten carbide beads (17.5 / 19 / 22 mm options) |
| Hardness (Body) | 28–32 HRC |
| Hardness (Carbide Zone) | ≥17.5 HRA (equivalent to ≥82 HRC) |
| Weight (per unit) | 35.0 kg |
| Origin | Zhuzhou, Hunan, China |
Yes. We offer full OEM/ODM support — including dimensional customization, material specification, carbide bead pattern optimization, and packaging adaptation — based on your engineering drawings or physical samples.
Each batch undergoes 100% dimensional inspection (CMM), hardness verification (Rockwell & Vickers), ultrasonic flaw detection, and destructive tensile testing. Full traceability via heat lot documentation is provided.
Yes. We manufacture and supply compatible tungsten carbide bullet teeth (B47K22H, 3050/3055/3060 series) with identical metallurgical specs — enabling complete system reliability and simplified inventory management.
Specify B85/2 today — backed by Zhuzhou Site’s 10+ years of tungsten carbide expertise and ISO 9001-certified manufacturing.
