Nuts and locking devices

Nuts and locking devices

Information

Locknuts are used to install, remove and secure bearings and other machine parts. Depending on how they are used, locknuts are referred to as mounting nuts, shaft nuts or removal nuts. So-called hook spanners or impact spanners are generally used for securing or releasing purposes. Bearings are pressed onto the taper of a shaft or adapter sleeve using locknuts. The adapter sleeve can also be pulled into the tapered bearing bore. Shaft nuts are used to insert withdrawal sleeves into the tapered bearing bore. Withdrawal sleeves are dismounted by screwing a removal nut onto the sleeve thread and rotating it against the inner ring of the bearing until it slides out from the bearing. Nuts (except removal nuts) are used to secure the bearing on the taper. These in turn are secured with locking devices (MB, MBL, or MS) to prevent them from coming loose.

Locknut product codes

The product codes for locknuts start with HM or KM.

Locknuts of types KM, KML or HM, HML, and HMLL have four grooves on their outer diameter. By contrast, the HM 30.. and HM 31.. ranges have eight grooves on their outer diameter and eight thread bores for securing a locking clip.

Suffixes

Different suffixes (letters) distinguish the various locknuts within the ranges. A distinction is made between H and HS designs.

H = Locknuts with the suffix H have additional thread bores right through them. This makes it possible to mount them with additional screws.
HS = Locknuts with the suffix HS have additional thread bores right through them and come with the relevant mounting screws.

Type MB.. H mounting washers are used during mounting/dismounting with mounting screws. These mounting washers prevent the mounting screws from damaging the bearing's inner ring or the sleeve.

Open configuration options

Use of locking devices

Lock washers from the MB and MBL ranges are used to secure type KM, KML, and HM.. T locknuts. Locking clips from the MS 30.. and MS 31.. ranges are used to secure type HM 30.. and HM 31.. locknuts.

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Bezeichnung G l (mm) D (mm)
KM 21 M 105x2 18 140
KM 21 H M 105x2 18 140
KM 21 HS M 105x2 18 140
KM 22 M 110x2 19 145
KM 22 H M 110x2 19 145
KM 22 HS M 110x2 19 145
KM 23 M 115x2 19 150
KM 23 H M 115x2 19 150
KM 23 HS M 115x2 19 150
KM 24 M 120x2 20 155
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Bezeichnung G l (mm) D (mm)
HM 136 THS Tr 680x6 72 820
HM 144 T Tr 720x7 72 870
HM 144 TH Tr 720x7 72 870
HM 144 THS Tr 720x7 72 870
HM 152 T Tr 760x7 75 910
HM 152 TH Tr 760x7 75 910
HM 152 THS Tr 760x7 75 910
HM 160 T Tr 800x7 75 950
HM 160 TH Tr 800x7 75 950
HM 160 THS Tr 800x7 75 950
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Bezeichnung G (Inch) l (Inch) D (Inch)
N-022 4.325 0.791 5.318
N-024 4.716 0.823 5.693
N-026 5.106 0.885 6.13
N-028 5.497 0.948 6.505
N-03 0.664 0.354 1.13
N-030 5.888 0.979 7.13
N-032 6.284 1.041 7.505
N-034 6.659 1.073 7.88
N-036 7.066 1.104 8.255
N-038 7.472 1.135 8.693
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Bezeichnung b (mm) h (mm) e (mm)
MS 3064 24 15 21
MS 3072 28 15 20
MS 3076 28 15 24
MS 3084 32 15 24
MS 3088 32 15 28
MS 3096 36 15 28
MS 31/1000 70 21 88
MS 31/1060 70 21 88
MS 31/1120 70 21 88
MS 31/1180 70 21 88
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Bezeichnung d3 (mm) f (mm) d1 (mm)
MB 28 192 135 140
MB 29 202 140 145
MB 3 32 15.5 17
MB 30 205 145 150
MB 31 212 147.5 155
MB 32 217 154 160
MB 33 222 157.5 165
MB 34 232 164 170
MB 36 242 174 180
MB 38 252 184 190
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Bezeichnung d3 (Inch) f (Inch) d1 (Inch)
W-09 2.734 1.684 1.792
W-10 2.922 1.884 1.992
W-11 3.109 2.069 2.182
W-12 3.344 2.267 2.4
W-13 3.578 2.455 2.588
W-14 3.828 2.658 2.791
W-15 4.109 2.831 2.973
W-16 4.375 3.035 3.177
W-17 4.625 3.253 3.395
W-18 4.938 3.418 3.582
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Bezeichnung d1 d2 (mm) s (mm)
MB 96 H 482 580 2.5