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Impact spanners

High impact forces without nut damage

SKF impact spanners are designed for safely tightening and loosening larger locknuts, especially after driving up a large bearing onto a tapered seating. They are not intended to be used to drive the bearing up a tapered seating.
  • Avoids shaft and nut damage
  • Safe and user friendly
  • Impact applied effectively to the nut
  • Suitable for nuts of series KM, HM..T, HML..T, HM 30, HM 31, AN.., N.. and N... (for nut sizes 23 and above)
  • Special wide impact face

Design of TMFN 23-30 and TMFN 30-40 (fig 1)
Design of other sizes TMFN impact spanners (fig 2)
Technical data
Designation
Locknut diameter

mm
in
TMFN 23-30
150
190
5.9
7.5
TMFN 30-40
195
245
7.7
9.6
TMFN 40-52
250
310
9.8
12.2
TMFN 52-64
320
385
12.6
15.2
TMFN 64-80
400
495
15.7
19.5
TMFN 80-500
520
620
20.5
24.4
TMFN 500-600
630
735
24.8
28.9
TMFN 600-750
750
950
29.5
37.4
Selection table
DesignationSuitable for nuts of series

HM .. (HM .. E)
TMFN 23-30
 
 
 
TMFN 30-40
 
 
 
TMFN 40-52
3044 - 3052
 
 
TMFN 52-64
3056 - 3064
3160
 
TMFN 64-80
3068 - 3084
3164 - 3176
 
TMFN 80-500
3088 -3096
3180 - 3196
30/500
TMFN 500-600
30/530 - 30/630
31/500 - 31/560
 
TMFN 600-750
30/670 - 30/800
31/600 - 31/750
 
Selection table
DesignationSuitable for nuts of series

HM .. (HM .. E)
HM .. T
TMFN 23-30
 
 
 
 
TMFN 30-40
 
 
 
 
TMFN 40-52
3044 - 3052
 
 
42 - 48
TMFN 52-64
3056 - 3064
3160
 
50, 52, 56
TMFN 64-80
3068 - 3084
3164 - 3176
 
 
TMFN 80-500
3088 -3096
3180 - 3196
30/500
 
TMFN 500-600
30/530 - 30/630
31/500 - 31/560
 
 
TMFN 600-750
30/670 - 30/800
31/600 - 31/750
 
 
Selection table
DesignationSuitable for nuts of series

AN ..
N ..
DIN 1804 (M)
TMFN 23-30
AN 22 -
AN 28
N 022 -
N 032
 
M105x2 - M130x3
TMFN 30-40
AN 30 -
AN 38
N 034 -
N 040
 
M140x3 - M180x3
TMFN 40-52
AN 40
N 044 -
N 052
N 44
M190x3, M200x3
TMFN 52-64
 
N 056 -
N 064
 
 
TMFN 64-80
 
N 068 -
N 084
 
 
TMFN 80-500
 
N 088 -
N 096
N500
 
TMFN 500-600
 
N 530 -
N 630
 
 
TMFN 600-750
 
N 670 -
N 800
 
 
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