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photo of one Robit top hammer.
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Singular button bit

Top Hammers

A percussive drilling tool used in surface or underground mining operations, where the impact mechanism is located at the top of the drill string, delivering rapid blows to the drill bit to break through rock formations, allowing for efficient hole drilling in various geological conditions; it’s known for its relatively high drilling speed and versatility compared to other methods like DTH (Down-the-Hole) drilling.

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key points about top hammers:

Mechanism

The hammer mechanism is situated on the top of the drill rod, with a piston that strikes a chuck holding the drill bit, generating the percussive force needed to break rock.

Applications

Commonly used in applications like exploration drilling, foundation drilling, quarry operations, and construction projects where a variety of rock types are encountered.

Advantages

  • High drilling speed: Can achieve fast penetration rates in most rock types.
  • Versatility: Adaptable to various drill bit designs to handle different rock conditions.
  • Relatively low cost: Generally less expensive than DTH systems, both in terms of equipment and operation.
  • Easy maintenance: Simple design allows for easier servicing and repairs.

Button Bits Types and Sizing

    Button Bits

    All of the Robit® button bits are manufactured of new 100% recyclable steel. In the environmentally friendly steel production process the CO² emissions have been reduced 80% and 95% of the waste is recycled including the process smoke which is filtered. The new steel grade gives even more uniform properties and improved fatigue strength which is crucial in rock drilling process. Designed for particular applications from soft rock formations to extremely hard conditions.

    Models:
    • A – medium and hard rock model
    • M – soft and medium hard rock model
    • S, SR – all around model
    • Se – evolution model for high power and frequency drilling
    • FF, FFR – Flat Face for medium and hard rock conditions
    • FF HD, FFR HD – Flat Face Heavy Duty model for more abrasive conditions
    • DC, DCR – Drop Center model for straighter holes with maximum flushing properties
    (for soft and medium hard rock for speed drilling)
    • DC HD, DCR HD – Drop Center Heavy Duty model for more abrasive conditions

    R25
    Order codeDiameter (mm)Diameter (in)Gauge (∡)
    TH RBIT 25R032A321 1/4″30°
    TH RBIT 25R033A331 5/16″30°
    TH RBIT 25R035M351 3/8″30°
    TH RBIT 25R038M381 1/2″30°
    TH RBIT 25R041M411 5/8″35°
    TH RBIT 25R043S431 11/16″30°
    TH RBIT 25R045S HD451 3/4″35°

    R28
    Order codeDiameter (mm)Diameter (in)Gauge (∡)
    TH RBIT 28R038M381 1/2″30°
    TH RBIT 28R045S451 3/4″35°

    RR34
    Order codeDiameter (mm)Diameter (in)Gauge (∡)
    TH RBIT 34RR043S431 11/16″30°
    TH RBIT 34RR045S HD451 ¾”35°
    TH RBIT 34RR048S481 ⅞”35°
    TH RBIT 34RR051S512″35°

    R32
    Order codeDiameter (mm)Diameter (in)Gauge (∡)
    TH RBIT 32R041M411 ⅝”35°
    TH RBIT 32R043S431 11/16″30°
    TH RBIT 32R043S HD431 11/16″30°
    TH RBIT 32R045S451 ¾”35°
    TH RBIT 32R045S HD451 ¾”35°
    TH RBIT 32R045A451 ¾”30°
    TH RBIT 32R048S451 ¾”35°
    TH RBIT 32R051S512″35°
    TH RBIT 32R054S542 1/8″35°
    TH RBIT 32R057S572 1/4″35°
    TH RBIT 32R064FF642 1/2″35°
    TH RBIT 32R064FFR642 1/2″35°
    TH RBIT 32R064DC HD642 1/2″35°
    TH RBIT 32R064DCR HD642 1/2″35°

    C38
    Order codeDiameter (mm)Diameter (in)Gauge (∡)
    TH RBIT 38C064FF642 1/2″35°
    TH RBIT 38C064FF HD642 1/2″35°
    TH RBIT 38C064FFR642 1/2″35°
    TH RBIT 38C064FFR HD642 1/2″35°
    TH RBIT 38C064DC642 1/2″35°
    TH RBIT 38C064DC HD642 1/2″35°
    TH RBIT 38C064DCR642 1/2″35°
    TH RBIT 38C064DCR HD642 1/2″35°
    TH RBIT 38C070FF702 3/4″35°
    TH RBIT 38C070FF HD702 3/4″35°
    TH RBIT 38C070FFR702 3/4″35°
    TH RBIT 38C070FFR HD702 3/4″35°
    TH RBIT 38C070DC702 3/4″35°
    TH RBIT 38C070DC HD702 3/4″35°
    TH RBIT 38C070DCR702 3/4″35°
    TH RBIT 38C070DCR HD702 3/4″35°
    TH RBIT 38C076FF763″35°
    TH RBIT 38C076FF HD763″35°
    TH RBIT 38C076FFR763″35°
    TH RBIT 38C076FFR HD763″35°
    TH RBIT 38C076DC763″35°
    TH RBIT 38C076DC HD763″35°
    TH RBIT 38C076DCR763″35°
    TH RBIT 38C076DCR HD763″35°

    C45
    Order codeDiameter (mm)Diameter (in)Gauge (∡)
    TH RBIT 45C070FF702 3/4″35°
    TH RBIT 45C070FF HD702 3/4″35°
    TH RBIT 45C070FFR702 3/4″35°
    TH RBIT 45C070FFR HD702 3/4″35°
    TH RBIT 45C070DC702 3/4″35°
    TH RBIT 45C070DC HD702 3/4″35°
    TH RBIT 45C070DCR702 3/4″35°
    TH RBIT 45C070DCR HD702 3/4″35°
    TH RBIT 45C076FF763″35°
    TH RBIT 45C076FF HD763″35°
    TH RBIT 45C076FFR763″35°
    TH RBIT 45C076FFR HD763″35°
    TH RBIT 45C076DC763″35°
    TH RBIT 45C076DC HD763″35°
    TH RBIT 45C076DCR763″35°
    TH RBIT 45C076DCR HD763″35°
    TH RBIT 45C083FF833 1/4″35°
    TH RBIT 45C083FF HD833 1/4″35°
    TH RBIT 45C083FFR833 1/4″35°
    TH RBIT 45C083FFR HD833 1/4″35°
    TH RBIT 45C083DC833 1/4″35°
    TH RBIT 45C083DC HD833 1/4″35°
    TH RBIT 45C083DCR833 1/4″35°
    TH RBIT 45C083DCR HD833 1/4″35°
    TH RBIT 45C089DC893 1/2″35°
    TH RBIT 45C089DC HD893 1/2″35°
    TH RBIT 45C089DCR893 1/2″35°
    TH RBIT 45C089DCR HD893 1/2″35°
    TH RBIT 45C089FF893 1/2″35°
    TH RBIT 45C089FF HD893 1/2″35°
    TH RBIT 45C089FFR893 1/2″35°
    TH RBIT 45C089FFR HD893 1/2″35°

    C51
    Order codeDiameter (mm)Diameter (in)Gauge (∡)
    TH RBIT 51C083FF833 1/4″35°
    TH RBIT 51C083FF HD833 1/4″35°
    TH RBIT 51C083FFR833 1/4″35°
    TH RBIT 51C083FFR HD833 1/4″35°
    TH RBIT 51C083DC833 1/4″35°
    TH RBIT 51C083DC HD833 1/4″35°
    TH RBIT 51C083DCR833 1/4″35°
    TH RBIT 51C083DCR HD833 1/4″35°
    TH RBIT 51C089FF893 1/2″35°
    TH RBIT 51C089FF HD893 1/2″35°
    TH RBIT 51C089FFR893 1/2″35°
    TH RBIT 51C089FFR HD893 1/2″35°
    TH RBIT 51C089DC893 1/2″35°
    TH RBIT 51C089DC HD893 1/2″35°
    TH RBIT 51C089DCR893 1/2″35°
    TH RBIT 51C089DCR HD893 1/2″35°
    TH RBIT 51C102FF1024″35°
    TH RBIT 51C102FF HD1024″35°
    TH RBIT 51C102FFR1024″35°
    TH RBIT 51C102FFR HD1024″35°
    TH RBIT 51C102DC1024″35°
    TH RBIT 51C102DC HD1024″35°
    TH RBIT 51C102DCR1024″35°
    TH RBIT 51C102DCR HD1024″35°
    TH RBIT 51C115FF1154 1/2″35°
    TH RBIT 51C115FF HD1155 1/2″35°
    TH RBIT 51C115FFR1156 1/2″35°
    TH RBIT 51C115FFR HD1157 1/2″35°
    TH RBIT 51C115DC1158 1/2″35°
    TH RBIT 51C115DC HD1159 1/2″35°
    TH RBIT 51C115DCR11510 1/2″35°
    TH RBIT 51C115DCR HD11511 1/2″35°
    TH RBIT 51C127DCR HD12712 1/2″35°

    RG51
    Order codeDiameter (mm)Diameter (in)Gauge (∡)
    TH RBIT 51RG089FFR893 1/2″35°
    TH RBIT 51RG089FFR HD893 1/2″35°
    TH RBIT 51RG089DCR893 1/2″35°
    TH RBIT 51RG089DCR HD893 1/2″35°
    TH RBIT 51RG102DCR1024″35°
    TH RBIT 51RG102DCR HD1024″35°

    RG60
    Order codeDiameter (mm)Diameter (in)Gauge (∡)
    TH RBIT 60RG102FF1024″35°
    TH RBIT 60RG102FF HD1024″35°
    TH RBIT 60RG102FFR1024″35°
    TH RBIT 60RG102FFR HD1024″35°
    TH RBIT 60RG102DC1024″35°
    TH RBIT 60RG102DC HD1024″35°
    TH RBIT 60RG102DCR1024″35°
    TH RBIT 60RG102DCR HD1024″35°
    TH RBIT 60RG115FF1154 1/2″35°
    TH RBIT 60RG115FF HD1154 1/2″35°
    TH RBIT 60RG127FF1275″35°
    TH RBIT 60RG127FF HD1275″35°
    TH RBIT 60RG127FFR1275″35°
    TH RBIT 60RG127FFR HD1275″35°
    TH RBIT 60RG127DC1275″35°
    TH RBIT 60RG127DC HD1275″35°
    TH RBIT 60RG127DCR1275″35°
    TH RBIT 60RG127DCR HD1275″35°
    TH RBIT 60RG140FF HD1405 1/2″35°
    TH RBIT 60RG140FFR HD1405 1/2″35°
    TH RBIT 60RG140DC HD1405 1/2″35°
    TH RBIT 60RG140DCR HD1405 1/2″35°