JX-21JG504-M20, JX-DN type square lock nut is square in shape,

Body material: DIN C45

Surface treatment: sandblasted black

Tempering hardness: 28-32HRC

Thread accuracy: ISO 4H precision turning

Plane deflection: 0.002-0.005mm

Screw grade: 12.9 grade

Locking metal: phosphor bronze

Specification: M5-M40

JX-DN type square lock nut is square in shape, its fixing copper is radially fixed, and the internal thread and end face are machined at the same time, which can ensure the accuracy of assembly. It can eliminate the need for a locking spacer and keyway. This type of square nut is mostly used for screw support seats.

Precision locknuts are used in working conditions that require high axial force and high runout accuracy and rigidity, and the threads and axial end faces of the locknuts are machined in one clamping, so their runout accuracy is very high.

Lock nut use: precision lock nut can effectively improve the assembly accuracy, improve the spindle deflection, simple installation, not easy to loosen, and extend the service life of the workpiece, widely used in the need for precision, strong, safe locking precision institutions. Precision locknuts are available for machine tools, textiles, printing, centrifuges, turbo compressors, air conditioners, land and marine operations, transportation equipment, aviation equipment, marine equipment, nuclear industry, agriculture and food industry, construction machinery, special machinery and other applications of various structural forms of locknuts.

1. Material: The precision lock nuts are made of high-quality 42CrMo, with a blackened surface and oil dipping treatment. Also can choose 45 steel, 40 chromium, stainless steel, and other different materials of the nut, the nut surface can also be customized according to the different use of the bad situation of galvanization, nickel plating, phosphating, and other treatments.

2. Lock nut installation: The assembly of the precision lock nut is simple, using a hook wrench or insert wrench to tighten with the rated tightening torque, the necessary tightening torque depends on the necessary pre-tightening. When pre-tightening the body of the nut, firstly, the locking screw should be gently tightened by the hexagonal wrench in turn until it feels obstructed. The maximum tightening torque of the locking screws is shown in the catalog.

3. Disassembly: The nut without a locking pin can be disassembled by loosening the locking screw, while the nut with a locking pin is not loosened to engage the shaft thread even if the locking screw is loosened.

Packing: Inner is Poly foam, out is carton. Then pallet. Carton size: 29*19*19.5CM and 23.5*17.5*8, CM and pallet size is: 215*100*90CM, or as your requirement.

Packaging & Delivery and Packaging Details

1. Shrink film+wooden box

2. Cardboard box+pallet

3. Color box

4. As per the customer's request