The lock nut is a common nut widely used in machinery and other industries.
Nuts
The first is to use two identical nuts to be screwed onto the same bolt, and a tightening torque is added between the two nuts so that the bolt connection is reliable. The second type is a special locking nut that needs to be used with a type of locking washer. The special lock nut is not a hex nut but a round nut. There are 3, 4, 6 or 8 notches on the circumference of the nut (depending on the size of the nut and the manufacturer's product series), this Several gaps are both the focus of the tightening tool and the snap-in of the bayonet washer.
The third method is to drill threaded holes (generally two, 90 distributed on the outer surface) from the outer surface of the nut to the inner surface of the threaded surface. It is used to screw in a small-diameter countersunk head screw in order to give the thread. Apply a centripetal force to prevent the lock nut from loosening. The relatively good quality lock nut currently sold on the market is provided with a small piece of copper that matches the thread of the lock nut on the inner surface of the nut to prevent the radial tightening screw from directly contacting the locked thread and being damaged. By.
This type of lock nut gradually starts to be applied in the case where the shaft end of the rotary motion type is locked, such as the loosening of the ball screw mounting end bearing.
Standard size
1 Scope This standard specifies the size of the lock nut (referred to as a nut), the locking device, technical requirements, acceptance rules and measurement methods. This standard applies to the design, production, inspection and user acceptance of tapered bushing nuts and locking devices.
2 Reference Standards The following standards contain provisions that, through reference in this standard, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards will be revised and all parties using this standard should explore the possibility of using the latest version of the following standards. GB/T 192—1981 General thread basic thread form GB/T 196—1981 General thread size (diameter 1~600 mm) GB/T 272—1993 Rolling bearing code method GB/T 699—1988 High quality carbon structural steel technical condition GB/T 1804—1992 Uncalibrated tolerances for linear dimensions of general tolerances GB/T 2516—1981 Ordinary thread deviation gauges (diameter 1 to 355 mm) GB/T 5796.1—1986 Trapezoidal thread form GB/T 5796.3—1986 Trapezoidal thread basics Size GB/T 5796.4-1986 Trapezoidal thread tolerance GB/T 6930-1986 Rolling bearing vocabulary GB/T 8597-1988 Rolling bearing packaging JB/T 3574-1997 Rolling bearing product sign JB/T 8921-1999 Rolling bearing and its commodity parts inspection rules.
3 Terminology The terms used in this standard comply with the provisions of GB/T 6930.
This standard specifies the marking system, indexes, test methods and signs for the mechanical and working performance of the effective moment type steel hexagonal locking nut. This standard applies to carbon steel or alloy steel, the width of the opposite side of GB 3104, the nominal height ≥ 0.8D, required to ensure that the load and effective torque, thread diameter of 3 ~ 39mm coarse teeth 6H class nuts. In addition to the effective torque portion, its thread size and tolerances are specified in GB 193, GB 196 and GB 197. The working temperature range of the nut shall be in accordance with: All-metal nuts without electroplating: -50°C～+300°C. All-metal nuts with electroplating:: -50°C～+230°C Nuts with non-metallic elements embedded: -50 °C ~ +120 °C This standard does not apply to nuts with special performance requirements (such as welding performance and corrosion resistance). Fine tooth locking nut or thin nut made of carbon steel or alloy steel for stainless steel and non-ferrous metals, the agreement of both parties can adopt the performance index and test method of effective torque stipulated in this standard.