Round nut nut
The stop washer for round nut, also known as the check washer, commonly known as the king eight pad, is a washer that prevents the round nut from loosening. It is widely used in electrical appliances, elevators, and machinery to fix rolling bearings to prevent loosening. Round nuts are generally fine-threaded and are mainly used for shaft end locking and are usually used with check washers. Round nuts and round nut stop washers have always been used together, see the following instructions for specific use.
Round nuts are often paired with locking washers. During assembly, the inner tongue of the washer is inserted into the groove on the shaft, while the outer tongue of the washer is inserted into the groove of the round nut, and the nut is locked; Alternatively, double nuts can be used to prevent loosening, often used as axial fixation for rolling bearings. Round nuts with thread specifications ranging from M10 × 1 to M200 × 3.
Marking Standard: The marking for round nuts with thread specification D=M16 × 1.5, material of 45 steel, groove or all heat treated hardness HRC35-45, and surface oxidation: Nut GB/T 812-88 M16 × 1.5.
Precautions for the installation of round nuts nut
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1. Orientation of the Chamfered Side: When the round nut is installed and used, the chamfered side should be towards the end of the compression. Install the round nut on the bolt with a stop washer by pressing it down, and pay attention to whether the chamfered side is facing down or the flat side is down. Some people say that the chamfered side is perpendicular to the thread axis and should be leaning on the locked surface. Actually, the chamfered side should be towards the pressing end. We have to see whether the width of the washer is consistent with the width of the circle on the chamfered side, and then see that the "eight claws" on the check washer have a certain angle.
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2. Tooth Alignment and Bending: There are teeth inside and outside the round nut stop washer, and the hole or groove should be made on the external thread matched with the round nut to incorporate the inner teeth of the washer. After the round nut is tightened in place, the external tooth of the washer corresponding to the nut wrench groove should be bent and embedded in the groove, so that the nut is fixed.
Frequently Asked Questions (FAQ)
What is the primary function of a round nut stop washer?
The stop washer (commonly known as the check washer) is designed to prevent the round nut from loosening. It is widely used in machinery, elevators, and electrical appliances to secure rolling bearings and maintain axial tightness under operational vibrations.
How do the round nut and the stop washer lock together?
During assembly, the inner tongue of the stop washer is placed into the shaft's groove, and the outer tongue of the washer is bent into one of the grooves on the outer circumference of the round nut. This interlocking design physically locks the nut and prevents rotation.
What are the standard thread specifications for round nuts?
Round nuts typically feature fine threads for more precise adjustment and secure locking. The standard thread specifications generally range from M10 × 1 to M200 × 3.
Which way should the chamfer face when installing a round nut?
During installation, the chamfered side of the round nut must face towards the end of the compression (facing the surface being clamped or locked) to ensure proper seating and contact alignment with the washer.
What does the marking "Nut GB/T 812-88 M16 × 1.5" indicate?
This standard marking indicates a round nut manufactured according to the GB/T 812-88 standard, featuring a thread specification of M16 with a 1.5mm pitch, typically made of 45 steel, heat-treated to HRC35-45, and finished with surface oxidation.