Secoroc Rock Drilling Tools. Product catalogue Tophammer equipment

Transcription

1 Secoroc Rock Drilling Tools Product catalogue Tophammer equipment

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3 Contents Page Integral drill rods 4 Plug hole rods 5 Tapered drill steel equipment 6 Drifting 11 Bench and production drilling 27 Shank adapters 49 COPROD 63 Auxiliary tools 67 Index 71 1

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5 Integral drill rods Plug hole rods Tapered equipment Page Integral drill rods 4 Plug hole rods 5 Tapered drill steel equipment 6 Directional drilling for dimension stone splitting 10 3

6 Integral drill rods 19 mm ( 3 /4") Chisel bit integral. Rod 19 mm ( 3 /4"). Shank hex. 19 mm ( 3 /4") 108 mm (4 1 /4"). Chisel bit integral. Rod 19 mm ( 3 /4"). Shank hex. 22 mm ( 7 /8") 108 mm (4 1 /4"). Seal product code 9159 (if needed). Length (L) Bit diameter Series mm foot/inch mm inch , '3 3 /4" / , '7 5 /8" / , '7 1 /2" / , '3 3 /8" / , '11 1 /4" / , '3" / , '10 1 /2" / , '6" , '1 1 /2" / , '3 3 /4" / , '7 1 /2" / , '11 5 /8" / , '11 1 /4" / , '6 3 /4" / , '10 1 /2" / , '3 3 /4" / , '7 1 /2" / , '3 3 /4" / , '3 3 /4" / , '11 5 /8" / , '7 1 /2" / , '7 1 /2" / , '11 1 /4" / , '3" / , '6 3 /4" / , '10 1 /2" / mm ( 7 /8") Chisel bit integral. Rod 22 mm ( 7 /8"). Shank hex. 22 mm ( 7 /8") 108 mm (4 1 /4"). Seal 9159 (if needed). Length (L) Bit diameter Series mm foot/inch mm inch , '7 1 /2" / , '3" / , '10 1 /2" / , '6" / , '1 1 /2" / , '9" / , '4 1 /2" / , ' / , '7 1 /2" / , '7 1 /2" / , '3" / , '10 1 /2" / , '6" / , '1 1 /2" / , '9" / , '4 1 /2" / , ' / , '7 1 /2" / , '3" /

7 Integral drill rods 22 mm ( 7 /8") Chisel bit integral. Rod 22 mm ( 7 /8") Shank hex. 22 mm ( 7 /8") 108 mm (4 1 /4"). Seal product code 9159 (if needed). Length (L) Bit diameter Series mm foot/inch mm inch , '3 3 /4" / , '7 1 /2" / , '11 1 /4" / , '3" / , '6 3 /4" / , '11 5 /8" / , '11 1 /4" / , '10 7 /8" / , '10 1 /2" / , '11 5 /8" / , '11 1 /4" / , '10 7 /8" / , '10 1 /2" / , '3 3 /4" / , '3 3 /4" / , '7 1 /2" / , '7 1 /2" / , '11 1 /4" / , '11 1 /4" / , '3" / , '3" / , '10 7 /8" / , '6 3 /4" / , '6 3 /4" / , '10 5 /8" / , '10 1 /2" / , '6" / , '6" / , '6" / , ' / , '3" / , '6" / Plug hole rods 19 mm ( 3 /4") Chisel bit plug hole rod. Shank hex 19 mm ( 3 /4") 108 mm (4 1 /4") Shank hex 19 mm ( 3 /4") 82 mm (3 1 /4") shank Length (L) Bit diameter Turned length (TL) mm foot/inch mm inch mm inch , /4" / / , /4" / / , /4" 22 7 / / , /4" / / , /4" 22 7 / / , ' 1 /4" 22 7 / , '1 3 /8" / , /4" / / , /4" 22 7 / /

8 Tapered drill steel equipment Drill bit designs Model -12 Model -14 Model -17 Model -23 Model -25 For soft to medium hard rock formations. One front and two side flushing holes. For soft to medium-hard rock. Two front and one side flushing hole. All-round drill bit for soft to medium-hard rock. Front and side flushing. Diametres up to 34 mm. For soft and abrasive rock. Front and side flushing. For soft to medium-hard rock. Flushing concentrated to the sides of the bit. Model -27 Model -33 Model -34 Model -40 Model -41, short skirt All-round drill bit for medium-hard to hard rock formations. Front and side flushing. Diametres from 35 mm. All-round bit with six gauge buttons for medium hard to hard rock formations. Front and side flushing. Inclined front buttons. All-round bit for soft to hard rock formations. Two front flushing holes for optimal speed and less hole deviation. Inclined front buttons. All-round bit for medium hard to hard rock. Side flushing only. Inclined front buttons. All-round bit for medium hard to hard rock. Front and side flushing. Inclined front buttons. Model -56 All-round drill bit for medium-hard to hard rock formations. Front and side flushing. Cross-type bit For hard and abrasive rock. Front and side flushing. Please observe that all button bits are manufactured oversized mm, meaning that for example a 36 mm bit is at least 36.5 mm as new. This is done because of the fast initial wear on button bits. When it is of importance, also consider that the hole is always 1 3 mm bigger than the bit dimension depending on rock formation. 6

9 Tapered drill steel equipment Buttons Gauge Front button diameter (mm) buttons buttons Flushing hole mm inch mm inch buttons Gauge Centre angle angle Side Centre Drill bit Diameter Length No. of For 22 mm ( 7 /8") rod. 4 46' taper. Short skirt. Button bit / , / , For 22 mm ( 7 /8") rod. 11 taper. Short skirt. -67 = ballistic buttons ** Long bit head / , / , / / , / , / , / , / L,39-20* / / , / , / , / , / , , / , / , / , For 22 mm ( 7 /8") rod. 12 taper. Short skirt / , / , / , / , / , / , / , / , / , / , / , / / L,39-20* / / , / , / , / , / , / , / , / , / , approx. kg 7

10 Tapered drill steel equipment Buttons Gauge Front button diameter (mm) buttons buttons Flushing hole mm inch mm inch buttons Gauge Centre angle angle Side Centre Drill bit Diameter Length No. of For 22 mm ( 7 /8") rod. 7 taper. Long skirt. Button bit / , / / , / / , / / , / / , / / , / / , / For 22 mm ( 7 /8") rod. 12 taper. Long skirt / , / / , / / , / / , / / , / For 25 mm (1") rod. 12 taper. Long skirt / , / / , / For 22 mm ( 7 /8") rod. 7 taper. Long skirt. Cross type bit / , / / , / For 22 mm ( 7 /8") rod. 12 taper. Long skirt / , / / , / / , / / , / / , / / , / / , / / , / approx. kg 8

11 Tapered drill steel equipment Tapered rod 22 mm ( 7 /8") hex rod. 108 mm (4 1 /4") shank. mm 4 46' taper Length (L) foot/inch 800 2'7 1 /2" , '3" , '6 3 /4" , '2 5 /8" , '10 1 /2" , '6" , '5 3 /4" , '1 1 /2" , '9" , '4 1 /2" , ' , taper 400 1'3 3 /4" , '7 1 /2" , ' , '6 3 /4" , ' , ' , '6" , '1 1 /2" , '9" , '4 1 /2" , ' , '7 1 /2" , '3" , taper 610 2' , ' , ' , ' , '6 3 /4" , ' , '6 3 /8" , '6" , '11 7 /8" , '1 1 /2" , '9" , '4 1 /2" , ' , '7 1 /2" , '3" , taper 610 2' , ' , ' , ' , '6 3 /4" , ' , ' , '6" , '11 7 /8" , ' , '9" , '4 1 /2" , ' , '7 1 /2" , '3" ,

12 Tapered drill steel equipment Tapered rod 25 mm (1") hex rod. 159 mm (6 1 /4") shank. Seal product code mm Length (L) foot/inch 12 taper '2 3 /4" , '10 1 /2" , '2 3 /8" , ' , Tapered rod with threaded shank end Length (L) mm foot/inch 12 Hex 25 mm (1") R32 (1 1 /4") '10 5 /8" C, '1 1 /2" C, Fully carburized. Rod section 28.5 mm 12 Hex 28 mm (1 1 /8") R32 (1 1 /4") '6 3 /8" C, '2" C, Fully carburized. Rod section 32 mm Directional drilling for dimension stone splitting Directional drill rod 22 mm ( 7 /8") hex rod. 108 mm (4 1 /4") round shank. No rotation. Length (L) mm foot/inch 11 taper 800 2'7 1 /2" , '3" , ' , '6" , '9" , '4 1 /2" , ' , '11 5 /8" , '3" , Buttons Gauge Front button diameter (mm) buttons buttons Flushing hole mm inch mm inch buttons Gauge Centre angle angle Side Centre For 22 mm ( 7 /8") rod. 11 taper. Short skirt. Directional Bit Drill bit Diameter Length No. of Button bit / , /4 Pilot hole Ø 32 mm / , /4 Pilot hole Ø 33/34 mm approx. kg 10

13 Drifting Page Drill bit designs 12 R25 (1") 13 SR28 (1 1 /8") 15 R28 (1 1 /8") 16 SR32 (1 1 /4") 18 R32 (1 1 /4") 19 SR35 (1 3 /8") 22 Dome bits for reaming 24 Reaming equipment 25 11

14 Drifting Drill bit designs Model -17 Model -27 Model -34 Model -37 Model Model gauge buttons, 2 front buttons. Model -17 is specially designed for bolting. Available with spherical or ballistic (-67) buttons. 2+3 gauge buttons, 2 smaller front buttons. With its large buttons, model -27 is ideal for medium hard to hard abrasive rock. Available with spherical or ballistic (-67) buttons. 3+3 gauge buttons, 2 front buttons. Model -34 offers very good penetration. Ideal for most rock formations including hard rock. Available with spherical or ballistic (-67) buttons gauge buttons, 3 front buttons. With 9 buttons and superb flushing, model -37 bits offer very good penetration. Ideal for most rock formations including hard rock with heavy frontal wear on the bit. Available with spherical or ballistic (-67) buttons. Guide bit. Square skirt. Ideal where hole deviation is a problem. Longer service life, better penetration rate and longer grinding intervals compared to a cross-type bit, which is normally used to avoid hole deviations. Suitable for most rock formations including hard rock. Available with spherical or ballistic (-67) buttons. Model Model -39 Model -41 Model -42 Model -56 Cross-type bit gauge buttons, 3 front buttons. With 9 full-ballistic buttons and excellent flushing with extra flushing grooves, model offers extremely good penetration rate in soft rock gauge buttons, 3 smaller front buttons. With its larger gauge buttons, model -39 is ideal for abrasive rock. Available with spherical buttons. 2+3 gauge buttons, 2 front buttons. For medium hard to hard rock formations. Available with spherical or ballistic buttons. Inclined front. Reaming bit. Dome-shaped front. Model -42 is a new alternative to traditional reaming equipment. Use in a predrilled pilot hole. Tried and tested with excellent results. 2+2 gauge buttons, 2 smaller front buttons. Traditionally used in hard rock formations, model -56 delivers excellent penetration rate. Available only with spherical buttons. 4 chisel inserts in cross formation. Traditional insert bit for extremely abrasive rock formations. Ideal for soft formations that cause snakeskin problems for carbide. Produces straight holes but has lower penetration than button bits. - 5 XXX - 6 XXX Flat face button bit Drop centre button bit - XXXX XXXX XXXX - 45 Ballistic buttons Full-ballistic buttons Retrac skirt Please observe that all button bits are manufactured oversized mm, meaning that for example a 45 mm bit is at least 46 mm as new and a 89 mm bit 90 mm. This is done because of the fast initial wear on button bits. When it is of importance, also consider that the hole is always 1 3 mm bigger than the bit dimension depending on rock formation. 12

15 Drifting R25 (1") Shank end rod Button bit Guide button bit Shank adapter Coupling Hex. drifter rod Cross-type bit Reaming equipment Drill bit designs -5xxx-17-5xxx-27-5xxx xxx-56 Cross-type bit Please note text on page 12 re. finished hole size. Buttons Drill bit Diameter No. of button diameter (mm) Buttons angle Flushing hole approx. mm inch R25 thread buttons Gauge Centre Gauge Centre Side Centre kg Spherical buttons Button bit / , / , / , / , / , / , / , / , / , Ballistic buttons / , / , / , / , / , Insert Width, mm Height, mm Cross-type bit / , / , / , / ,

16 Drifting R25 (1") Drifter rod mm Length (L) foot/inch Rope thread R 25 (1") Hex 25 mm (1") R 32(1 1 /4") '10 5 /8" C, '2 5 /8" C, '10 1 /2" C, '6 3 /8" C, '9 3 /8" C, '2 1 /4" C, Fully carburized. Rod section 28.5 mm '1 5 /8" C, '1 5 /8" C, Coupling Thread diameter Diameter Length (L) mm inch mm inch mm inch Rope thread / / / , / / / , Shank end rod Full bridge -57 Length (L) mm foot/inch Rope thread Seal 22 mm ( 7 /8") hex 108 mm (4 1 /4") shank. 25 mm (1") thread Fully carburized /8" C, ' C, '5 7 /8" C, '3 3 /8" C, '11 1 /4" C, ' C, ' C, '6" C, ' 9 3 /4" C, mm (1") hex 108 mm (4 1 /4") shank. 25 mm (1") thread " C, ' C, '11 1 /4" C, ' C, ' C, mm (1") hex 159 mm (6 1 /4") shank. 25 mm (1") thread " C, ' C, '7 1 /2" C, '6" C, '1 1 /2" C, mm (1 1 /8") hex 159 mm (6 1 /4") shank. 25 mm (1") thread '10 1 /4" C,

17 Drifting SR28 (1 1 /8") MAGNUM SR28 thread system 33 % more material means a substantial increase in metal fatigue resistance 28 mm (1 1 /8") diameter thread 25 mm (1") diameter thread FOCUS button bit technology Conical shaped rope thread facilitates rapid coupling and uncoupling More material at the bit head Shank adapter Coupling Hex. drifter rod Button bit Drill bit designs -5xxx-17-5xxx-27-5xxx-41 Drill bit Diameter Buttons No. of button diameter (mm) Buttons angle Flushing hole approx. mm inch SR28 thread buttons Gauge Centre Gauge Centre Side Centre kg Spherical buttons Button bit / , / , / , / , / , / , Ballistic buttons / , / , Drifter rod Please note text on page 12 re. finished hole size. Length (L) mm foot/inch SR28/R32 thread SR28 (1 1 /8") Hex 28 mm (1 3 /8") R32 (1 1 /4") '10 7 /8" C, '10 5 /8" C, '6 4 /8" C, '10 1 /2" C, '6 3 /8" C, Fully carburized. Rod section 32 mm '9 3 /8" C, '2 1 /4" C, '8 1 /8" C, '3 4 /5" C, Coupling Thread diameter Diameter Length mm inch mm inch mm inch Rope thread / / / , / / / , Full bridge

18 Drifting R28 (1 1 /8") Button bit Shank adapter Coupling Hex. drifter rod Guide button bit Cross-type bit Reaming equipment Drill bit designs -5xxx-27 5xxx xxx-37-5xxx-56 Cross-type bit Please note text on page 12 re. finished hole size. Buttons Gauge No. of button diameter (mm) buttons Flushing hole mm inch R28 thread buttons Gauge Centre angle Side Centre Spherical buttons Drill bit Diameter Button bit / , / , / , / , / , / , Ballistic buttons / , / , Insert Width Height Cross-type bit / , / , / , / , approx. kg 16

19 Drifting R28 (1 1 /8") Drifter rod Length (L) mm foot/inch Rope thread R28 (1 1 /8") Hex 28 mm (1 1 /8") R32 (1 1 /4") '10 1 /2" C, '6 3 /8" C,02 13, ' 1 /4" C, '1 5 /8" C, Fully carburized. Rod section 32 mm '1 1 /2" C, '1 5 /8" C, R28 (1 1 /8") Hex 28 mm (1 1 /8") R38 (1 1 /2") '1 1 /2" C, '1 5 /8" C, Fully carburized. Rod section 32 mm R28 (1 1 /8") Hex 32 mm (1 1 /4") R32 (1 1 /4") '1 5 /8" C, Fully carburized. Rod section 35.8 mm R28 (1 1 /8") Hex 32 mm (1 1 /4") R32 (1 1 /4") '1 1 /2" C, '1 5 /8" C, With slimmed shank end for female shank adapters. Fully carburized. Rod section 35.8 mm R28 (1 1 /8") Hex 32 mm (1 1 /4") R38 (1 1 /2") '1 5 /8" C, '1 5 /8" C, Fully carburized. Rod section 35,8 mm Coupling Full bridge -57 Thread Diameter Length mm inch mm inch mm inch Rope thread / / / , / / / , / / / , / / / ,

20 Drifting and bolting SR32 (1 1 /4") MAGNUM SR32 thread system Approx. 30 % more material means a substantial increase in metal fatigue resistance 32 mm (1 1 /4") diameter thread 28 mm (1 1 /8") diameter thread FOCUS button bit technology Conical shaped rope thread facilitates rapid coupling and uncoupling More material at the bit head Shank adapter Coupling Hex. drifter rod Button bit Drill bit designs -5xxx Please note text on page 12 re. finished hole size. Drill bit Diameter Buttons No. of button diameter (mm) Buttons angle Flushing hole approx. mm inch SR32 thread buttons Gauge Centre Gauge Centre Side Centre kg Spherical buttons Button bit / , / , / , " , Ballistic buttons / , / , / , / , Drifter rod Length (L) mm foot/inch SR32/R38 thread SR32/T38 thread SR32 (1 1 /4") Hex 32 mm (1 1 /4") R/T38 (1 1 /2") '2 3 /4" C, '2 5 /8" C, '2" C, '1 5 /8" C, '1 1 /2" C, Fully carburized. Rod section 35.8 mm '1½" C, Coupling Thread Diameter Length mm inch mm inch mm inch Rope thread T thread / / / , / / / , / / / ,00* 1.5 Full bridge / / / , , * Recommended for high frequency drifters / / / , ,

21 Drifting R32 (1 1 /4") Button bit Hex. drifter rod Guide button bit Shank adapter Coupling Round drifter rod Cross-type bit Hex. Speedrod Dome reaming bit Reaming equipment Drill bit designs xxx xxx xxx xxx xxx Cross-type Cross-type retrac Please note text on page 12 re. finished hole size. Drill bit Diameter Buttons Gauge No. of button diameter (mm) buttons Flushing hole approx. mm inch R32 thread buttons Gauge Centre angle Side Centre kg Spherical buttons Button bit / , / , / , / , / , / , / , / , / , , , , , ,

22 Drifting R32 (1 1 /4") Buttons Gauge No. of button diameter (mm) buttons Flushing hole mm inch R32 thread buttons Gauge Centre angle Side Centre Drill bit Diameter Spherical buttons Button bit / , / , / , / , , / , , , , , Ballistic buttons / , / , / , / , / , / , / , / , / , , , , , , / , / , / , Full-ballistic buttons (Soft rock bits) / , / , / , / , , , / , Insert Width Height Cross-type bit / , / , / , , , / , / , X-type bit , approx. kg 20

23 Drifting R32 (1 1 /4") Drifter rod Length (L) mm foot/inch Rope thread T thread R32 (1 1 /4") Hex 32 mm (1 1 /4") R/T38 (1 1 /2") '10" C, '10" C, '1 1 /2" C, C, '1 3 /4" C, ' C, C, '1 3 /8" C, '1 1 /2" C, C, Fully carburized. Rod section 35.8 mm '1 1 /2" C, C, '1 1 /2" C, R32 (1 1 /4") Hex 32 mm (1 1 /4") R38 (1 1 /2") '1 5 /8" C, Double thread, fully carburized. Rod section 35.8 mm R32 (1 1 /4") Hex 35 mm (1 3 /8") R/T38(1 1 /2") '1 5 /8" C, C, '9 3 /4" C, C, '1 5 /8" C, C, '1 1 /2" C, '1 5 /8" C, C, '9 1 /8" C, C,02 34, '1 3 /4" C, C, Fully carburized. Rod section 39.3 mm '1 3 /4" C, C, ' 1 /8" C, C, R32 (1 1 /4") Hex 35 mm (1 3 /8") T38 (1 1 /2") '1 5 /8" MF-C, '1 5 /8" MF-C, '1 3 /4" MF-C, '1 3 /4" MF-C, ' MF-C, Speedrod, fully carburized. D = 57 mm. Rod section 39,3 mm R32 (1 1 /4") Round 39 mm (1 17 /32") T38 (1 1 /2") '1 3 /4" C, Fully carburized. Coupling Full bridge -57 Thread diameter Diameter Length mm inch mm inch mm inch Rope thread T thread / / / ,00* / / / , , / / / , , * Recommended for high frequency drifters. Shank end rod Length (L) mm foot/inch Rope thread Seal 25 mm (1") hex 108 mm (4 1 /4") shank. R32 mm (1 1 /4) thread Fully carburized ' 3 /8" C,

24 Drifting SR35 (1 3 /8") MAGNUM SR35 thread system 25% more material means a substantial increase in metal fatigue resistance 35 mm diameter thread 32 mm diameter thread FOCUS button bit technology Conical shaped rope thread facilitates rapid coupling and uncoupling More material at the bit head Hex. drifter rod Button bit Shank adapter Coupling Round drifter rod Guide button bit Hex. Speedrod Dome reaming bit Round Speedrod Reaming equipment Drill bit designs -5xxx-27-5xxx xxx xxx xxx Please note text on page 12 re. finished hole size. Drill bit Diameter Buttons Gauge No. of button diameter (mm) buttons Flushing hole approx. mm inch SR35 thread buttons Gauge Centre angle Side Centre kg Spherical buttons Button bit / , / , / , Ballistic buttons / , / , / , / , , , / ,39-20* / , / , ** Reversed flushing 22

25 Drifting SR35 (1 3 /8") Drifter rod Length (L) mm foot/inch SR35/R38 thread SR35/T38 thread SR35 (1 3 /8") Hex 35 mm (1 3 /8") R/T38 (1 1 /2") '9 1 /8" C, '1 5 /8" C, '4" C, '9 7 /8" C, '1 5 /8" C, C, '1 5 /8" C, C, '1 3 /4" C, C, Fully carburized. Rod section 39.3 mm '1 3 /4" C, ' C, '1 5 /8" MF-C, SR35 (1 3 /8") Hex 35 mm (1 3 /8") T38 (1 1 /2") '1 5 /8" MF-C, '1 3 /4" MF-C, Speedrod, fully carburized. D = 57 mm. Rod section 39.3 mm SR35 (1 3 /8") Round 39 mm (1 17 /32") T38 (1 1 /2") '1 3 /4" C, ' 1 /8" C, Fully carburized. SR35 (1 3 /8") Round 39 mm (1 17 /32") T38 (1 1 /2") '1 3 /4" MF-C, Speedrod, fully carburized. D = 57 mm Coupling Full bridge -57 *Recommended for high frequency rock drills. Thread diameter Diameter Length mm inch mm inch mm inch Rope thread T thread / / / ,00* / / / , , / / / , ,

26 Drifting Dome bits for reaming SR28, SR32, R32 (1 1 /4"), SR35 (1 3 /8") Dome bits for reaming Please note text on page 12 re. finished hole size. Buttons Gauge Thread Diameter No. of button diameter (mm) buttons Flushing hole mm inch mm inch buttons Gauge Centre angle Side Centre Spherical buttons SR / , SR / , R / , R / / , R / , R / , SR / / , SR / , SR / , Ballistic buttons SR / , R / , R / / , R / , SR / / , SR / , approx. kg 24

27 Drifting Reaming equipment Hex 22 ( 7 /8"), R25 (1"), R28 (1 1 /8"), SR32, R32 (1 1 /4"), SR35 (1 3 /8") Drill bit, 6 taper Reaming button bit for 22 mm ( 7 /8") pilot rod and 25 mm (1"), 28 mm (1 1 /8"), 32 mm(1 1 /4") pilot adapter. Diameter Number Buttons button diameter (mm) mm inch of buttons Gauge Centre Gauge buttons angle / , , / , Pilot rod, 6 taper 22 mm ( 7 /8") hex. Shank length 108 mm (4 1 /4"). Length mm foot/inch 800 2'7 1 /2" , '11 1 /4" , '3" , '6 3 /4" , '10 1 /2" , Pilot adapter, 6 taper For 64, 76 and 89 mm reaming button and cross-type bits. Thread Diameter Pilot mm inch mm inch hole mm Rope thread / , / / , / / , SR / / , SR / / , Drill bit, 12 taper Reaming button bit for 28 mm (1 1 /8"), 32 mm (1 1 /4") and 35 mm (1 3 /8") pilot adapter. Diameter Number Buttons button diameter (mm) mm inch of buttons Gauge Centre Gauge buttons angle / , , , , Pilot adapter, 12 taper For 89, 102 and 127 mm reaming button bits. Thread Diameter Pilot mm inch mm inch hole mm Rope thread / / , / / , SR / / , For 89, 102 and 127 mm reaming button bits / ,

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