1.Promotion short section is used for special tools during the drilling of oil, gas and geological exploration. The promotion short section of unitary structure is divided into 18 degree shoulder and 90 degree shoulder. You can choose the homologous promotion short section according to structural form of the lift sub when use it.
2.The size of Non-magnetic heavy weight drill pipe
Nominal size In(mm)
Joint OD (mm)
Chamfering diameter (mm)
We have organized several common questions for our clients，may help you sincerely：
①How about your company？
A world class manufacturer & supplier of castings forging in carbon steel and alloy steel，is one of the large-scale professional investment casting production bases in China,consisting of both casting foundry forging and machining factory. Annually more than 8000 tons Precision casting and forging parts are exported to markets in Europe,America and Japan. OEM casting and forging service available according to customer’s requirement.
②How to guarantee the quality of the products？
We have established the international advanced quality management system，every link from raw material to final product we have strict quality test；We resolutely put an end to unqualified products flowing into the market. At the same time, we will provide necessary follow-up service assurance.
③How long can we receive the product after purchase?
In the purchase of product within three working days, We will arrange the factory delivery as soon as possible. The pecific time of receiving is related to the state and position of customers.Commonly 7 to 10 working days can be served.
- Q:SKF bearing samples provide full set of SKF bearing samples, and other brand samples
- Bearing samples directly to the company, want it to send ah ~ we are all so ~ even if I have, how to give you?
- Q:Why are the front fork bearings of the GY6 so difficult to buy, smaller than others?
- if the big nut steering column, in the absence of special sleeve case, can use spanner or hook wrench assembly.
- Q:Are there any differences between bearings used on fans and other ordinary bearings?
- the fan usually has two ends adjustable heart or one end of the cylinder with diagonal contact at one end.
- Q:Motor vibration is too large, in addition to bearing problems, there are other reasons?
- It is estimated that the bearing clearance is too large to cause vibration. If the original pump work environment temperature of 20 degrees, now 5 degrees. When the thermal expansion of the bearing decreases and the clearance becomes larger, the vibration of the motor will be too large. It is suggested that the clearance bearings be selected according to the running temperature and speed of the motor.
- Q:What are the world bearing giants?
- International bearing giants:Sweden: SKF (SKF group)Germany: INA/FAG (Schaeffler group)United States: TIMKEN (The Timken Company)Japan: NSK (Nske) NTN (NTN) KOYO (Guang Yang) NACHI (fujikoshi)NMB (Mei Beiya) THK (main line, unit FYH (bearing) main bearings etc.)
- Q:In the customs tariff classification,
- Also called the "Bush", is in the shape of half cylinder tile.
- Q:What are the advantages of ceramic ball bearings versus other bearings?
- 1, insulation bearings;2, light weight, less heat, you can have higher working limit speed.
- Q:Hello, I'd like to ask what kind of bearings PN307 is?
- Hello, please check the model of this bearing in detailThere is no PN307 modelWith RN307, cylindrical roller bearings, bore 35Then consult me
- Q:In the end is one-way bearings skidding or other reasons, the following reasonable interpretation of the phenomenon
- Is the quality of bearings, the size is not standard, because the axis tolerances are limited, resulting in a loose tight. Replace the bearings of better quality.In principle, the general transition fit, one-way needle, this structure is too simple, and the accuracy is not high, the domestic small factory product quality is not stable.A one-way bearing is a type of bearing that can be turned freely in one direction and locked in another direction. One-way bearings, also known as overrunning clutch, but according to different industries, the role of different naming.
- Q:What is the cause of a large bearing vibration of a turbine and other bearings?
- Because other bearing vibration is normal, can eliminate unbalance, misalignment and rubbing may, bearing vibration large connection stiffness problems, such as lack of lubricating oil, bearing, bearing seat, platen and the foundation of the existence of deficiencies and possible loosening of the tight force.
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