BGL KMT3 lock nut

BGL KMT3 belongs to lock nut, part of our Bushings and sleeves range. Tell us how many you need by WhatsApp or email and we'll get back to you promptly with a quote for KMT3 and any equivalents.

Precision lock nuts in the BGL KMT series hold bearings firmly in place on machine tool spindles and rotating shafts. Three bolts spaced at 120 degrees press angled pins against the shaft thread, so the nut stays put and can be reset to the same position each time. A hook or nut wrench does the tightening, and the body is carbon steel.

Reading the code is the first step in selection. After KMT comes a digit that marks the size step, running from KMT0 up through KMT7. That digit is a size reference, not a measurement you can take off the part, and each step covers its own thread and dimension range. What you actually need before ordering is the shaft thread together with its diameter. The KMTA version does the same job but takes a screw wrench rather than a hook wrench.

Typical installations include lathe, milling, grinding and machining center spindles, plus motors and other precision equipment where bearing adjustment has to hold. Machine tool maintenance, component production and equipment repair all rely on this type of nut, particularly where vibration or axial load would work a lesser fastener loose. Rotating shaft applications that call for compact, low-profile retention are another common fit.

Before mounting, confirm the shaft thread, diameter and pitch, and decide which wrench you have on hand, since that determines whether KMT or KMTA suits you. The shaft should be clean and free of burrs. Thread the nut on, then bring the three bolts down firmly against the shaft. Check that the bearing is aligned and stay within the recommended tightening torque so nothing deforms. Lubrication of the assembly also affects how the nut performs.

Other manufacturers use their own designations for precision lock nuts, and equivalents are matched on thread and diameter dimensions. If you are holding a code from a different brand or a part you cannot identify, send it over and we can locate the corresponding BGL nut. Whether a substitute works depends on the thread, the diameter and the wrench type lining up.

Send your KMT or KMTA code, or the measurement you need, by WhatsApp or email and our team will prepare a quote. Bring a competitor's code and we will point you to the compatible option.