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Ultra Small Size B16 B19 B22 Transition Coupling With Blue Anti Rust Coating For Coal Mine Anchor Drill Rod Reducer Adapter
B16 B19 B22 Transition Coupling
Core Definition of B - Series Hex Drill Rod Marking Standard
The letter B stands for hollow hexagonal drill rod specially designed for underground wet bolting drilling. The central inner hole allows water flow to flush coal dust and meets coal mine explosion proof dust removal requirements. The numbers after B refer to hex opposite side dimension in millimeters :
B16 : Hex opposite side 16mm - the smallest specification for ultra narrow heading auxiliary anchoring , used for thin rock bolt hole drilling in narrow coal drift
B19 : Hex opposite side 19mm - mainstream universal size of hand held pneumatic rock drill for routine mine roof bolting
B22 : Hex opposite side 22mm - matched with medium sized airborne anchor drill for high load side wall drilling
Our ultra small reducer coupling adopts stepped variable diameter structure with multi hexagon clamping lugs , precisely designed for mutual conversion between the three B - type drill rod sizes. The blue anti rust paint coating is customized for damp , coal slurry rich underground mine environments.
Select Reducer Adapter Based on 3 Typical Underground Working Scenarios
1. Ultra Narrow Low Height Roadway Drilling
In low seam coal mines where roadway height is less than 1.2m , only compact small hand held wind drills can work. Select B19 to B16 transition coupling to convert standard B19 rig connector to tiny B16 drill rod for micro shallow anchor holes. The small sized adapter avoids getting stuck in confined working spaces , greatly improving drilling efficiency for thin coal layer supporting.
2. Mixed Specification Bolting Construction on Same Working Face
Many medium coal mines stock both B19 and B22 drill rods for different rock hardness construction. B19 to B22 reducer adapter enables single anchor rig to switch between two kinds of drill rods flexibly, cutting spare drill rig purchasing expenses by over 28% for mine owners.
3. Emergency Replacement for Damaged Drill Rod On Site
When partial B22 drill rods crack or wear out during continuous tunneling without instant supplement , operators use B22 to B19 transition coupling to reuse existing intact B19 drill rods , avoiding production shutdown caused by sudden consumable shortage.
Key Quality Inspection Points Before Bulk Purchase
Material : Premium alloy steel forging body with overall quenching treatment to resist impact wear from frequent percussive drilling underground. Inferior adapters easily crack at thread parts under repeated impact loads.
Thread Precision : Fine processed inner and outer threads ensure tight fit with B - series hex rods , preventing thread slipping and drill rod falling during high speed drilling.
Anti corrosion Treatment : Uniform blue electrostatic spray coating isolates underground muddy water and corrosive mine gas , prolonging service life in humid mine environments.
Practical Daily Maintenance Guide for Mini Transition Coupling
After each shift operation , clean coal mud and rock debris stuck on coupling threads and outer hex grooves with high pressure water gun.
Apply a thin layer of anti rust lubricating grease on threads before storage to avoid rust locking caused by long term damp stacking.
Store unused reducers in dry ventilated warehouse away from coal slurry and chemical mine wastewater.
Conclusion
Reasonable matching of ultra small size coal mine anchor drill rod reducer adapter is an effective cost saving measure for modern underground bolting projects. Our factory supports customized non standard B - series transition coupling according to clients' exclusive drill rod parameters. We have supplied bulk mini B16 / B19 / B22 couplings to dozens of coal mining enterprises in Russia , Indonesia and South Africa since early 2026. Feel free to send your drill rig and drill rod detailed specifications to get free customized matching suggestions.
HENGLONG is an internationally recognized and leading producer of superior percussive rock drilling tools.Our high performance products include top hammer drill bits extension and tunneling rods,integral and tapered rods,shank adapters,coupling,drag bits,blast furnace tapping tools,self dr... HENGLONG is an internationally recognized and leading producer of superior percussive rock drilling tools.Our high performance products include top hammer drill bits extension and tunneling rods,integral and tapered rods,shank adapters,coupling,drag bits,blast furnace tapping tools,self dr...
