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    What is PGM certificate for hammer drill bit and masonry drill bit?

    Prufgemeinschaft, the PGM is an independent association which certifies hammer and straight shank drill bits since 1978. 
    He stays up the standards, and , checks products and policies of quality monitoring of the manufacturers. Drill bits have to meet the requirement of a strict specifications with the aim of allowing safe anchorings. 
    These controls carry among others, on the diameter, the centring of the carbide tip, the straightness of drill bits. 
    Certified drill bits are stamped with the PGM logo with the manufacturer number. 
  • What is the difference of the drill bit between the PGM certificated HTT ones and non-PGM certificated ones?

    Comparison PGM quality Common quality
    Carbide Tip type and size PGM certified with strict filtering No
    Size criteria Parameters such as tip angle, shank diameter, spiral thickness etc. are designed and calculated by professional German company to maximize the drilling performance and effective dust removal.
    No fixed design parameter or purposes.
    Soldering PGM requires auto brazing with controlled brazing tip length and mechanically centralized  tip.
    Manual soldering, soldered by experience, no accurate tip positioning.
    Heat treatment Special vacuum heat treatment technique according to PGM requirement, ensure the high breaking tenacity of the bit shank to match the life time of the wear-resistant and tough tungsten tip.
    Normal 40Cr steel or carbon steel heat treatment. HRC can reach similar rank but the inner structure cannot ensure high breaking tenacity or long time wear-resistant.
    Surface treatment Specific shot-peening technique removes the shank stress points to create high torque strength and reduce flute wear, prolong the shank life, make the bit with bright and smooth surface.
    Sand blasting, cannot remove the shank stress points, easy to rust.
    Anti-rust treatment Anti-rust period above 2 years thanks to the PGM standard premium anti-rust oil. Common aqueous or dry anti-rust oil, with anti-rust period around one year.

  • What is the difference between those drill bit HTT vacuum soldered and the other ones high frequency welded?

    comparison Auto-copper alloy soldering Common manual brazing
    Soldering flux Special copper flux prescription with higher melting point  Copper wire/strip with 10-25% silver, or common pure copper, with 700-850°C melting points.
    Brazing temperature 1200-1250°C brazing temperature ensures the drill bit with a higher heat-resistant performance when in continuous drilling, the strong attachment of the copper flux prevents the tip from falling. 700-850°C
    Soldering process Inside the vacuum brazing oven, gradually warming up ensures the steady character of the tungsten tip, not easily become fragile. Instant heat up destroy the inner structure of the tungsten tip to become fragile,breakage happen during drilling.
    Soldering strength Melted copper flux assures proper and complete distribution of copper brazing elements to attach the tip and shank as a whole. Then longer life time is ensured. Manual soldering, soldering flux not evenly distributed, open or inconsistent soldering easily appear. The unevenly distributed soldering flux always cause the tungsten tip dropping in big diameter drill bits.

  • What are the HTT main featured product lines and their features?

    HTT main featured product lines refer to Hammer drill bit SDS-plus, Hammer drill bit SDS-max, Masonry drill bit, TCT multi-purpose drill bit, Glass&Tile drill bit, etc. Their features are as below:

    Carbide design: Our innovative, patented designed carbide metal edges have been optimized for the most challenging applications in concrete and masonry, even for reinforcements in concrete. An aggressive carbide metal profile ensure fast drilling progress. The integrated tip design ensures ideal drilling performance and perfect centring. The precise workmanship of HTT drill bits is evidenced in the precise alignment and soldering of tungsten carbide plates and the low run-out values.

    Milling process: The helix is produced by milling. The spiral is created from solid material. This guarantees the precision of the spiral progression. The external and internal diameter dimensions of the helical are precisely complied with. The benefits during application include a smoother drilling process and contenuous drilling dust removal, thus minimizing the deflagration risk.

    Helix shapes: Patented and those exclusive helix shapes designs guarantee optimal removal of drilling dust without risk of deflagration, for example, thanks to alternating narrow and wide backs. Maximum speed with ideal impact energy performance is a result of reduced friction thanks to computer-aided design.

    HSP Technology: High pressure Shot-peening technology finishes the drill bit surface treatment, which ensures an ideal surface texture: HTT hammer drill bits thus only exhibit minimal susceptibility to breakage under the most demanding applications – even including impacting on reinforced concrete. Ideal especially for long bits, the HST curing process at the same time guarantees excellent bending flexibility without the risk of breakage.

    Run-out checking: Each HTT drill bit is subject to a detailed run out test after having completed production. The advantages for users are more precise holes in terms of diameter and depth as well as lower degrees of vibration during operation.

  • What are the tips and tricks for different material checking before hammer drill bit drilling work?

    Check for reinforced concrete
    HTT hammer drill bits will also stand up to reinforcements. Despite this, it is still a good idea to check the wall structure with a detector before you start drilling and to drill masonry only wherever possible. Reinforcements are integrated 
    into constructions for reasons of structural strength and shouldn‘t be cut if this can be avoided. If you cannot avoid 
    this for design reasons, you need to consult a structural engineer before you start.
    Check for piping and cable routing
    When you start drilling, it is a good idea to check the area for piping and cable routing. Cables and pipes normally lead 
    vertically up and down to the socket or fitting. For this reason, it is a not recommended to drill directly above or below fittings or sockets. For through hole drilling you should always analyse the structure of the opposite side. Use a special detector for this purpose.
    Grease the shank & remove residual materials
    We recommend greasing the shaft end of the bit before inserting into the chuck. This will extend the service life of your 
    hammer drill. Before fitting a plug, you should always remove material residues from the drill hole to guarantee the best 
    possible safety for the plug.



HTT is majoring in producing and supplying those high professional quality drill bit products to the global industries and markets.



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