KMT and KMTA Precision Lock Nuts are used to locate bearings in machines and equipment that require high precision such as lathes, grinders, milling machines, motors, shut-off valves, spindle and ball screws.

These nuts have 3 brass pins angularly distributed around its circumference which are tightened against the shaft by screws. The pins are machined to match the shaft thread and its tilt is equal to nut thread angle so the nuts are not subject to axial loads or deformation, allowing locking in the exact position. Although they use the same locking system, the KMT and KMTA nuts differ by the external profile and tightening tools required.

Precision lock nuts are made of Carbon steel as standard with optional choice of Stainless Steel.

Assembling

The KMT nuts are usually mounted with hook spanners, however, sizes up KMT 15 can be mounted using wrenches. The KMTA are mounted using pin wrenches or a pin-type face spanner and both of them are equipped with through-body screws. Once assembled, the bolts should be tighten lightly until each brass pin touches the shaft thread and only then tighten the screws alternately with a torque wrench until the recommended torque value is achieved for all the three bolts.

Removal 

When removing the precision nuts KMT and KMTA, first loosen the three screws. Note that the brass pins can still be attached to the shaft thread, in order to proceed, tap the nuts near the pins using a copper or rubber hammer to loosen them. Only then remove the nut. 

Drawing and Technical Data Sheet of KMT & KMTA Series Precision Lock Nuts

Lock Nut No.	d1	d3	d4	d5
	mm	mm	mm	mm
KMT 0	23	28	11	21
KMT 1	25	30	13	23
KMT 2	28	33	16	26
KMT 3	33	37	18	29
KMT 4	35	40	21	32
KMT 5	39	44	26	36
KMT 6	44	49	32	41
KMT 7	49	54	38	46
KMT 8	59	65	42	54
KMT 9	64	70	48	60
KMT 10	68	75	52	64
KMT 11	78	85	58	74
KMT 12	82	90	62	78
KMT 13	87	95	68	83
KMT 14	92	100	72	88
KMT 15	97	105	77	93
KMT 16	100	110	83	98
KMT 17	110	120	88	107
KMT 18	115	125	93	112
KMT 19	120	130	98	117
KMT 20	125	135	103	122
KMT 22	134	145	112	132
KMT 24	144	155	122	142
KMT 26	154	165	132	152
KMT 28	164	175	142	162
KMT 30	174	185	152	172
KMT 32	184	195	162	182
KMT 34	192	205	172	192
KMT 36	204	215	182	202
KMT 38	214	225	192	212
KMT 40	224	235	202	222
KMTA 5	35	42	26	20
KMTA 6	40	48	32	20
KMTA 7	47	53	38	20
KMTA 8	52	58	42	22
KMTA 9	58	68	48	22
KMTA 10	63	70	52	24
KMTA 11	70	75	58	24
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