R38 170 - 190mm Underground Mining Drill Threaded Coupling

R38 170 - 190mm Underground Mining Drill Threaded Coupling

Description

Coupling sleeves are available with both half-bridge and full-bridge types, as well as adapter couplings.
Semi-bridge coupling, by far is the most popular, has a small non-threaded bridge in the centre. The drill rod cannot thread past the centre of the couplings, and the smaller diameter rods portions butt together in the centre bridge area of the coupling. Semi-bridge couplings are most suited to high torque machines. Most rope (R) and Trapezoidal (T) threaded couplings are semi-bridged.

Full bridge coupling has a great advantage that it positively eliminates the potential for the coupling to creep along the threaded joints. These couplings, are typically used in a Trapezoidal thread, in surface drilling application, have better uncoupling characteristics and tend to maintain tighter joints. Full-bridge couplings have less chance of jamming and are best suited to machines equipped with independent rotation.

Standard coupling using R38 thread system

Threaded coupling sleeve are made of high quality of alloy steels and CNC machining guarantee our reliable and consistent quality control of coupling sleeves.

Both semi-bridge and full-bridge coupling sleeves are manufactured by us in different sizes as below:Thread sizes: R22, R25, R28, R32, R35, R38, T38, T45, T51;
Two catagories: Standard coupling sleeves, adapter(crossover) coupling sleeves;

• R38 thread system
• Widely used in drifting and tunneling

Color: Green or Based on Customer requirements

Material: Tungsten carbide and high strength alloy steel

Processing: CNC milling and proprietary heat treatment process

Type: R38 Standard Coupling

Applications
• Underground Mining
• Tunneling

Competitive Advantage
High strength chromium-molybdenum steel with high fatigue strength and excellent wear resistance

Specification