About Us / Quality Control

Quality Assurance System

1.Equal quality as famous brand (SKF & FAG)

2.Bearings qualified rate can reach more than 99.9%

3.1-month free replacement, 12-month free maintenance

4.Recall any unqualified products unconditionally

Return Policies

If you receives goods have any quality problems or describe discrepancy condition or differs from your sample, or damaged or lost in transit, we support 100% refunds or unconditional return policy within 7 days of your receipt of the goods.

Manufacturing Quality Control

Leading-edge technology allows for submicron precision. We produce high-quality shapes, reflecting our technology onto every product. We inspects each bearing through the advanced instrument and mild technology by the established quality-controlling department.

Below the following is Jobst’s production process and corresponding quality inspection:

♦ Material incoming: 100% inspection

♦ Inner & outer rings turning: 100% inspection

♦ Heat treatment: random inspection

♦ Face grinding: 100% inspection

♦ Centerless grinding: 100% inspection

♦ Bore grinding: 100% inspection

♦ Inner & outer groove grinding: random inspection

♦ Inner & outer grooves superfinish grinding: 100% inspected

♦ Assembly: 100% inspection

♦ Grese filling: 100% inspection

♦ Noise & vibration testing: 100% inspection

♦ Packing & storing: the final 10% inspection before the formal shipment

Strict Quality Process Controls

Quality is built into many production processes with innovative “mistake-proofing” devices. Kilian systems are well documented and robust. The assembly process pictured below measures bearing components so the optimum ball size is selected. This optimized selection allows accurate control of the amount of play in the assembled bearings. Examples:

♦ Optical comparators confirm component geometry

♦ Electronic and other gauges conform to ANSI standards

♦ Metallurgical, hardness and plating inspection

♦ Bearing life cycle and durability testing

♦ O.C. testing of all components before assembly