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By certification 
The hob parts "bearing" made by the company adopt imported original products such as TIMKEN of US, SKF of Sweden and NTN of Japan and the sealing elements adopt UME of US, which ensures that all kinds of cutting tools have the performance features of high precision, high bearing, strong reliability and high life.
● Bearings: TIMKEN
● Floating seal:Trelleborg
● Floating seal seat, left and right end cap material: 40CrNiMoA HRC36 ± 3
● Mandrel material: 40CrNiMoA HRC42 ± 3
● Oil type: Shell SHEL460
DISC RINGS
Forgings are made by the closed die method as Germany. Subsequent processing consisting of two machining steps and four heat treatment steps are completed in China.
The steel manufacturing processes are designed to keep impurities to the lowest.Melting in an Electric Arc Furnace is followed by vacuum degassing. Ingot molds are filled from the bottom with the liquid steel shrouded in argon gas. Exceptionally clean steel ensures high resistance to fatigue, resulting in longer cutter disc life
BEARINGS
Carburized and case-hardened, uses Timken tapered roller bearings that outperform other bearings in dynamically loaded conditions and harsh environments. During assembly, the bearings are pre-loaded to effectively excavate hard rock in the most severe operating conditions.
SEALS
Durable metal-to-metal face seals eliminate ingress of foreign materials while silicone torics maintain elasticity even at high temperatures.
RETAINER
The patented compensation retainer has a superior piston design with a much larger surface area than other cutter manufacturers. The outer surfaces are carburized and case-hardened for extended life in harsh conditions.
HUB
Made of durable alloy steel, hubs are furnace heat-treated, quenched, and tempered for toughness. The disc-mounting surface is further induction hardened and finished by grinding.
SHAFT
shafts are made of the same alloy steel as the hubs, and go through an identical process of heat-treatment, quenching, and tempering. They are additionally gas nitride for surface hardness
All types of finished products of cutting rings: Standard cutter ring, heavy cutter ring, arc cutter ring, surface automatic surfacing wear-resistant welding cutting ring, bal-tooth cutting ring, insert cutter ring, etc
http://www.chinarzf.com/
