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BRUCKNER DEAD CENTERS
255, 256, 257,258 FORMS

Forms 255-258

Common Technical Features:
  • Material:  High quality tool steel, through-hardened.
  • Out of Roundness:  Max. 0.003 mm (.0001")
  • Taper Shank Tolerance:  The deviation of taper Z is < AT4 (guage accuracy) to DIN 228.  This means a precise seating of the center in the tailstock sleeve.

     

Form 255
  • For small and large centerbores
  • To DIN 807 and extended, 60°
Technical Data:
Form Morse Taper ID No. D (mm) G SW lC L Draw-off Nut

255

 MT2 2552 18 M22x1.5 17 48 112 M252
MT3 2553 24.1 M27x1.5 22 57 138 M253
MT3 2553-150 24.1 M27x1.5 22 69 150 M253
MT3 2553-170 24.1 M27x1.5 22 89 170 M253
MT4 2554 31.6 M36x1.5 27 72.5 175 M254
MT4 2554-190 31.6 M36x1.5 27 87.5 190 M254
MT4 2554-230 31.6 M36x1.5 27 127.5 230 M254
MT5 2555 44.7 M48x1.5 41 87.5 217 M255
MT5 2555-250 44.7 M48x1.5 41 120.5 250 M255
MT6 2556 63.8 M68x1.5 55 108 290 M256
Metr. taper 80 1:20 2557.20 80 M85x2 - 134 330 M257
Metr. taper 80 1:10 2557.10 80 M85x2 - 130 330 M257

 

Form 256
  • For limited work space
  • Copying center, 60°/40°
Technical Data:
Form Morse Taper ID No. D (mm) d G SW lC L Draw-off Nut

256

 MT2 2562 18 6 M22x1.5 17 48 112 M252
MT3 2563 24.1 8 M27x1.5 22 57 138 M253
MT4 2564 31.6 10 M36x1.5 27 72.5 175 M254
MT5 2565 44.7 12 M48x1.5 41 87.5 217 M255
MT6 2566 63.8 15 M68x1.5 55 108 290 M256

 

Form 257
  • For threading and for centerbores deep inside a workpiece
  • Slim Design, 60°/30°
Technical Data:
Form Morse Taper ID No. D (mm) d G SW I lC L Draw-off Nut

257

 MT2 2572.06-120 18 6.5 M22x1.5 17 15 52 120 M252
2572.09-120 18 9 M22x1.5 17 17 52 120 M252
2572.11-120 18 11 M22x1.5 17 21 52 120 M252
MT3 2573.09-150 24.1 9 M27x1.5 19 17 69 150 M253
2573.13-150 24.1 13 M27x1.5 19 25 69 150 M253
MT4 2574.09-190 31.6 9 M36x1.5 27 17 87.5 190 M254
2574.13-190 31.6 13 M36x1.5 27 27 87.5 190 M254
2574.19-190 31.6 19 M36x1.5 27 53 87.5 190 M254

 

Form 258
  • For large centerbores
  • Bullnose Dead Center, 60°
Technical Data:
Form Morse Taper ID No. D (mm) d G SW lC L Draw-off Nut
258 MT2 2582.40 40 1 M22x1.5 36 64 128 M252
2582.80x20 80 20 M22x1.5 36 88 152 M252
MT3 2583.80x20 80 20 M27x1.5 36 89 170 M253
MT4 2584.80x20 80 20 M36x1.5 36 89.5 192 M254
2584.125x65 125 65 M36x1.5 36 89.5 192 M254
MT5 2585.80x20 80 20 M48x1.5 46 100.5 230 M255
2585.100x50 100 50 M48x1.5 46 90.5 220 M255
2585.125x65 125 65 M48x1.5 46 100.5 230 M255

Draw-off Nut to DIN 807:

ID No. d3 1A 1B
M 252 M22x1.5 15.5 32
M253 M27x1.5 17.5 41
M254 M36x1.5 21 55
M255 M48x1.5 23 75
M256 M68x1.5 25.5 100
M257 M85x2.0 40 130

 

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