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Designation system

The designations of SKF bearing accessories follow a system that consists of a product type and size identification with or without a suffix.

Examples and the applicable options for lock nuts with a lock washer, locking clip or locking plate are given below.
Basic bearing designation system

Examples

Lock nut
KML 24
whereKML =
24 =

Lock washer
MB 15 AwhereMB =
15 =
A =

Locking clip
MS 31/710
whereMS 31 =
710 =

Locking plate
PL 68wherePL =
68 =

Applicable options for lock nuts with a lock washer, locking clip or locking plate


Product type
AN
Lock nut, dimensions in accordance with ANSI standard, normal series
HM
Lock nut with a trapezoidal thread
HME
HM lock nut with a recessed outside diameter
HML
HM lock nut, light series
HMLL
HML lock nut with a lower sectional height
KMLock nut dimensions in accordance with ISO standard
KMLLock nut with a lower sectional height
NLock nut, dimensions in accordance with ANSI standard
N lock nuts are available in two series; N 00 normal series and N 000 low profile series
MBLock washer, dimensions in accordance with ISO standard for a KM lock nut
MBLLock washer, dimensions in accordance with ISO standard for a KML lock nut
MS 30Locking clip, dimensions in accordance with ISO standard for an HM 30 lock nut
MS 31Locking clip, dimensions in accordance with ISO standard for an HM 31 lock nut
PLLocking plate, dimensions in accordance with ANSI standard
WLock washer, dimensions in accordance with ANSI standard
W lock washers are available in two series; W 00 for lock nuts in normal series (AN and N) and W 000 for lock nuts in low profile series (N 0) without an axial tab


Size identification
for metric dimensions
010 mm thread diameter
112 mm thread diameter
2
15 mm thread diameter
3
17 mm thread diameter
4 to
(x5) 20 mm thread diameter
96
(x5) 480 mm thread diameter
/500 to
500 mm thread diameter
/1120
1120 mm thread diameter
for inch dimensions 
0
0.391 in. thread diameter
1
0.469 in. thread diameter
2
0.586 in. thread diameter
3
0.664 in. thread diameter
4 to
0.781 in. thread diameter
96
18.894 in. thread diameter
500 to
19.682 in. thread diameter
950
37.410 in. thread diameter


Suffixes
BWhitworth thread
TTrapezoidal thread
AIncreased plate thickness for MB lock washers
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