HMZ Locknuts.pdf
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HMZ Locknuts
– simple and reliable locking devices
Technical Product Information
A Member of the
Schaeffler Group
HMZ Locknuts
Application · Characteristics
Application
Characteristics
Material
The new HMZ locknuts are easy to
handle, permitting accurate and
secure axial locking of bearings
and other machine parts on shafts.
They are already being successfully
used in paper machines and wind
turbines.
FAG locknuts of series 30
*)
(HMZ30)
can, as a rule, be used for the
same applications as grooved nuts
or locknuts (KM, HM) with lock
washers or locking clamps (MB, MS)
and are reliable locking devices
that provide a frictional connection.
They are used to fasten and lock
bearings on cylindrical and tapered
shafts or on adapter sleeves.
Design characteristics
HMZ locknuts are made of steel
with a minimum tensile strength
of 350 MPa.
Characteristics of HMZ locknuts:
• No retention grooves in the OD.
• The locknuts’ internal thread is
axially split by an annular groove
(slot).
• 4(8) threaded countersunk holes
in the side face for the clamping
screws.
• 4(8) threaded holes (offset in the
OD circumference relative to the
countersunk holes) for the
threaded rod which is used to
screw the locknut onto the shaft
thread.
Threads
Locknuts with a thread diameter
of up to 200 mm have a metric
finepitch thread to DIN 13 and
quality grade 6H. Larger HMZ
locknuts have a trapezoid thread
to DIN 103/ISO 2903 and quality
grade 7H.
The corresponding shaft threads
must be made to quality grade 7e.
Scope of delivery
Dimensions
The scope of delivery includes the
HMZ locknut, one threaded rod and
the clamping screws.
On delivery, the HMZ locknuts are
protected from corrosion by oil.
On request, they will be delivered
in a long-term packaging.
The main dimensions and the
material of HMZ locknuts are
identical with those of conventional
grooved nuts and comply with the
standard specifications for series
KM30, HM30 (DIN 981, ISO 2982-2).
*) HMZ locknuts of series 31 on request.
On request, the locknuts can
additionally be provided with a
protective surface coating:
zinc phosphated, Corrotect,
electroplated, etc.
2
HMZ Locknuts
Advantages · Mounting · Dismounting
Advantages
Mounting
Please note:
After mounting the
bearing, check if there is sufficient
thread contact between locknut
and shaft. If necessary, insert a
shim.
• No retention groove in the shaft
required (no notch effect, higher
strength, lower cost due to
simplified production process).
• No grooves in the locknut OD, no
lock washers or locking clamps
(cost savings, simplified design).
• Simplified mounting (no fitting of
lock washers or locking clamps).
• Easy to screw onto shafts thanks
to shaft thread without retention
groove.
• Secure grip is provided by axial
clamping screws that permit
uniform locking/clamping over
the locknut OD (preventing
damage to the shaft thread and
sleeve thread).
• Bearings can be locked in any
axial position (the locknut does
not have to be turned back).
• No replacement of damaged lock
washers or locking clamps
required when bearings are
replaced.
• Full interchangeability with
conventional locknuts.
• Frictional connection prevents
the locknuts from working loose.
For bearings with HMZ locknuts,
FAG generally recommends to use
the hydraulic method. Mounting is
effected in a similar manner as HM
locknuts:
• Prior to mounting, check the shaft
thread and contact surfaces for
cleanliness and screw the threaded
rod into one of the radial threaded
holes.
• Place HMZ locknut onto the shaft
thread with the chamfer facing
the contact surface and screw it
on as far as possible.
The locknut can be screwed on
more easily if the thread is thinly
coated with lubricant and the
locknut is slightly lifted (instead
of pulled) while being turned.
• After the locknut has been
screwed on, clamp and lock it by
means of the 4 (8) clamping
screws with the tightening torque
specified in the table.
As the screws are tightened, the
locknut’s thread flanks are
pressed against the shaft thread,
(see sketch), providing a frictional
connection that prevents the
HMZ locknut from working loose.
• If bearings with a cylindrical bore
have to be heated prior to
mounting, they must be locked
immediately after mounting by
means of the HMZ locknut in
order to prevent creeping of the
inner ring as it cools down. If a
gap has formed between locknut
and contact surface and between
bearing and shaft shoulder after
the ring has cooled down, the
locknut must be readjusted.
• After the mounting process,
remove the threaded rod and
keep it for the dismounting
process.
Sketch
Dismounting
• Unscrew the axial clamping
screws.
• Unscrew the HMZ locknut by
means of the threaded rod.
Caution! The bearing fit on the
tapered seat may be released
abruptly. This axial movement
must be limited by the locknut.
For this reason, the locknut
should be turned back slightly
farther than the normal drive-up
distance but not completely.
The technical and economic
advantages are particularly
attractive to machine manufacturers,
but machine users can also benefit
from them when a machine has to
be repaired and/or bearings need
to be replaced.
Important maintenance information:
If, during operation, a gap forms
between HMZ locknut and contact
area as a result of the loads acting
on them, the locknut must be
readjusted during regular
maintenance activities.
3
HMZ Locknuts
d
s
D
m
d
2
D
a
b
1
HMZ Locknuts M90~2 – Tr340~5
Thread
Dimensions
Clamping
Mass
Code
Tightening torque
screws
W
per clamping screw
d
2
D
m
b
1
D
a
d
s
Number
M
AL
mm
kg
FAG
Nm
M90~2
120
16
108
M5
4
0,6
HMZ18
6
M95~2
125
17
113
M5
4
0,7
HMZ19
6
M100~2
130
18
120
M6
4
0,8
HMZ20
11
M105~2
140
18
126
M6
4
0,9
HMZ21
11
M110~2
145
19
133
M6
4
1,0
HMZ22
11
M115~2
150
19
137
M6
4
1,1
HMZ23
11
M120~2
155
20
138
M6
4
1,1
HMZ24
11
M125~2
160
21
148
M6
4
1,3
HMZ25
11
M130~2
165
21
149
M6
4
1,3
HMZ26
11
M135~2
175
22
160
M6
4
1,6
HMZ27
11
M140~2
180
22
160
M6
4
1,6
HMZ28
11
M145~2
190
24
171
M6
4
2,2
HMZ29
11
M150~2
195
24
171
M6
4
2,2
HMZ30
11
M155~3
200
25
182
M6
4
2,4
HMZ31
11
M160~3
210
25
182
M6
4
2,6
HMZ32
11
M165~3
210
26
193
M8
4
2,8
HMZ33
27
M170~3
220
26
193
M8
4
2,9
HMZ34
27
M180~3
230
27
203
M8
4
3,2
HMZ36
27
M190~3
240
28
214
M8
4
3,5
HMZ38
27
M200~3
250
29
226
M8
4
3,9
HMZ40
27
Tr220~4
260
30
242
M8
4
3,4
HMZ3044
27
Tr240~4
290
34
270
M10
4
5,4
HMZ3048
54
Tr260~4
310
34
290
M10
4
5,8
HMZ3052
54
Tr280~4
330
38
310
M10
4
6,9
HMZ3056
54
Tr300~4
360
42
336
M10
4
10,0
HMZ3060
54
Tr320~5
380
42
356
M10
4
10,6
HMZ3064
54
Tr340~5
400
45
376
M12
4
12,1
HMZ3068
93
4
HMZ Locknuts
d
s
D
m
d
2
D
a
b
1
HMZ Locknuts Tr360~5 – Tr1500~8
Thread
Dimensions
Clamping
Mass
Code
Tightening torque
screws
W
per clamping screw
d
2
D
m
b
1
D
a
d
s
Number
M
AL
mm
kg
FAG
Nm
Tr360~5
420
45
394
M12
4
12,5
HMZ3072
93
Tr380~5
450
48
422
M12
4
16,7
HMZ3076
93
Tr400~5
470
52
442
M16
4
19,1
HMZ3080
230
Tr420~5
490
52
462
M16
4
19,8
HMZ3084
230
Tr440~5
520
60
490
M16
4
27,8
HMZ3088
230
Tr460~5
540
60
510
M16
4
29,1
HMZ3092
230
Tr480~5
560
60
530
M16
4
30,1
HMZ3096
230
Tr500~5
580
68
550
M20
4
35,7
HMZ30/500
464
Tr530~6
630
68
590
M20
4
46,9
HMZ30/530
464
Tr560~6
650
75
610
M20
4
48,5
HMZ30/560
464
Tr600~6
700
75
660
M20
4
58,7
HMZ30/600
464
Tr630~6
730
75
690
M20
4
61,2
HMZ30/630
464
Tr670~6
780
80
740
M20
4
77,5
HMZ30/670
464
Tr710~7
830
90
780
M20
4
99,5
HMZ30/710
464
Tr750~7
870
90
820
M20
4
104,5
HMZ30/750
464
Tr800~7
920
90
870
M20
4
111,3
HMZ30/800
464
Tr850~7
980
90
925
M20
4
118,7
HMZ30/850
464
Tr900~7
1030
100
975
M24
8
141,8
HMZ30/900
798
Tr950~8
1080
100
1025
M24
8
150,2
HMZ30/950
798
Tr1000~8
1140
100
1085
M24
8
173,3
HMZ30/1000
798
Tr1060~8
1200
100
1145
M24
8
183,8
HMZ30/1060
798
Tr1120~8
1260
100
1205
M24
8
194,3
HMZ30/1120
798
Tr1180~8
1320
100
1265
M24
8
205,8
HMZ30/1180
798
Tr1250~8
1390
110
1335
M24
8
244,7
HMZ30/1250
798
Tr1320~8
1460
110
1405
M24
8
257,3
HMZ30/1320
798
Tr1400~8
1540
110
1485
M24
8
272,0
HMZ30/1400
798
Tr1500~8
1650
110
1595
M24
8
311,9
HMZ30/1500
798
5
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