Hand Drilling, Countersinking & Spotfacing


RB(I) 258 Microstop Cage

Stroke 27mm | 1.06in

Cutter Thread M8 X 1 or 1/4”-28

Arrangement of drill components labeled as Basic Drill Cage, Mounting Base 9081507AW, Mounting Base 9081507F, Nose Piece.
  • High precision microstop cage, body in heat treated chrome steel, fully ground throughout. This ball mounted microstop cage includes two needle bearings for best utilisation.
  • When using the RB 258, any misalignment of the microstop cage is corrected by the unique ball pivoting spindle. This assembly ensures perpendicularity throughout the operation at all time.
  • High precision microstop cage, body in heat treated chrome steel, fully ground throughout. This ball mounted microstop cage includes two needle bearings for best utilisation.
  • Centring-cone of the cutter (120°) for perfect concentricity.
  • Microstop depth adjustment (1 scale division = .001”).
  • Microstop depth setting is held securely in place by locknut with seal. This patented feature allows an easy loosening of the lock-nut without damage to the drill cage.
MODEL INPUT STYLE SHANK CUTTER THREAD STROKE VACUUM MOUNTING
BASE STYLE
WINDOW
SIZE
NOSE INSERT
STYLE
DIAMETER
MAX
OVERALL
LENGTH
WEIGHT
IN MM MM MM MAX
MM
MIN
MM
G
10015500W BALL PIVOT 0.250 6.35 M6 X 1 27 NO TAPPED M19F FOR NOSE LARGE 29 156 141 250
10015500PT BALL PIVOT 0.250 6.35 M6 X 1 27 NO TAPPED M19F FOR NOSE SMALL NYLON 29 156 141 250
10015550W BALL PIVOT 0.250 6.35 1/4"-28 27 NO TAPPED M19F FOR NOSE LARGE 29 156 141 250
10015550 BALL PIVOT 0.250 6.35 1/4"-28 27 NO TAPPED M19F FOR NOSE SMALL NYLON 29 156 141 250
* High Resolution cages with 0.0001" are available.

Microstop Cage Parts

REFERENCE INDEX QTY DESCRIPTION
90025033 1 1 SPINDLE
90245100 2 31 BALL 2 MM DIA
90255005 3 1 PLUG
90405165 4 1 NEEDLE CAGE
90405295 5 1 NEEDLE CAGE
90495020 6 1 LOCKNUT
90505026 7 1 BODY
90620024 8 1 BUSH
90815077W 9 1 MOUNTING BASE LARGE WINDOW
90815077 9B 1 MOUNTING BASE
90825035 10 1 NOSE PIECE
91015011 11 1 RB 258 SLEEVE
91015012 11 1 RBI 258 SLEEVE
91216100 12 1 PIN
93045010 13 1 PAWN
93430020 14 1 SPRING
93430046 15 1 SPRING
93440010 16 1 WASHER
93605050 17 1 CIRCLIPS
94215020 18 1 VERNIER ASSEMBLY

RB258 Large Window Microstop Cage
RB258 Small Window Microstop Cage

Technical Data

Shank: Ø 6.35mm | 1/4in dia Weight: 250 g
Cutter thread: RB 258 M6 X 1 | RBI 258 1/4:-28F Overall length maxi: 156mm | 6.14in
Stroke: 27mm | 1.06in Overall length mini: 141mm | 5.55in
Ext. Maxi: Ø 29mm | 1.141in dia