SJ Series Metal Sealed Bearing Tri-Cone Bit

Cutting Structure

Enhancing the wear-resistance of teeth with high-density premium tungsten carbide hardfacing on the tooth surfaces for steel tooth bit. Reinforcing the compressive mechanical properties of inserts by using premium tungsten carbide insert with new formula and new techniques for insert bit.

Gauge Structure

Multiple gauge protection with gauge trimmers on the heel and gauge inserts on the gauge surface of the cone, tungsten carbide inserts and hardfacing on the shirttail increases gauge holding capabilities and seal protection.

Bearing Structure

High precision journal bearing with two thrust faces. Balls lock cone. Hardfaced head bearing surface. Cone bearing inlaid with friction reducing alloy and then silver-plated. Abrasion resistance and seizure resistance of the bearing are improved, and suitable for high rotary speed.

Seal and Lubrication

The advanced metal seal package consists of two metal seals and two elastic rubber energizers. Energizers ensure good contact being kept on the two sealing surfaces of metal rings through elastic force generated by compression, and achieves the bearing sealing. In the drilling, the metal seals are relatively dynamic, and the energizers are static. This will increase the reliability and durability of bearing seal. The pressure compensator system and advanced grease can greatly increase the lubricating reliability.

Product Application

It is applicable for downhole motor and high-speed rotary reliability.

• Bit Size		Bit Model
  inch	mm
  7 7/8	200	SJ517G	SJ527G	SJ547GY	SJ617GY	SJ627G	SJ637GY
  8 1/2	215.9	SJT117GW	SJT127GW	SJT437GK	SJT447GK	SJT517G	SJT537G	SJT617GY	SJT627G	SJT637GY
  9 1/2	241.3	SJT117GW	SJT127GW	SJT437G	SJT517G	SJT537G	SJT547G	SJT617GY
  12 1/4	311.1	SJT117GW	SJT127GW	SJT437G	SJT517G	SJT537G	SJT617GY	SJT627G	SJT637GY
  17 1/2	444.5	SJT117GW	SJT127GW	SJT517G	SJT537G	SJT617GY	SJT627G	SJT637GY