Thrust screws and ball-ended thrust screws: Additional sizes available from stock
Erwin Halder KG can look back on decades of experience in the development of standard parts, focusing especially on workholding systems. Our countless parts deliver solutions to a wide array of clamping challenges. For instance, our thrust screws - composed of a threaded pin at the front combined with a pressed pin - are an ideal choice for situations where shafts need to be clamped gently without scratching the surface and are also ideally suited for pressing on thread spindles. They are capable of fixing in place shafts without the need for prior mechanical machining and are used to provide adjustable resistance for rotating shafts.
The threaded pins of the thrust screws and the pins are made, respectively, from stainless steel (1.4305) or heat-treated steel and from brass or plastic. While the brass pads are able to generate greater holding forces during clamping, the comparatively soft pins made of plastic keep the part to be clamped from being scratched and come with electrical insulation. The thrust screws in their latest iteration are now available in diameters ranging from M3 to M12. Their lengths of the versions with brass pad and the one with plastic pin vary, respectively, between 5 mm and 42.5 mm and between 3.8 and 102.1 mm.
Clamping workpieces with non-parallel surfaces
The ball-ended thrust screws are made up of a threaded pin that is made from either heat-treated steel
(1,200 N/mm2 +/- 100 N/mm2) or (1.4305) and a moving ball – fully spherical or flat-faced – at the front end. Since the ball fully contours to the workpiece, ball-ended thrust screws are a popular choice for situations where the surfaces that need to be fastened, clamped or supported are not parallel. When screwed into, for instance, a fixture, the parts transfer the generated force to the surfaces of the component. Erwin Halder KG has complemented their selection of headless ball-ended thrust screws by additional sizes. Unlike their headed sister version, these models can be screwed in along their entire length.
The versions that saw an expansion include, for instance, anti-locking ball-ended thrust screws that come with a flat-faced ball and no head. Its anti-turn locking device keeps the ball from twisting inward along with the surface. The versions Halder supplies with a plain surface are now available from stock in sizes ranging from M6 to M16; heat-treated steel version can also be ordered in M20 and M24. Their lengths vary between 12 and 80 mm depending on the version ordered. Halder offers the ball-ended thrust screw model that includes a ribbed, flat-faced ball with sizes of M8 to M24 and lengths of 16 to 120 mm.
Precise adjustment thanks to fine-pitch thread
Ball-ended thrust screws with fine-pitch thread and no head allow for a more precise adjustment of the screw penetration depth than their counterpart versions with a normal thread. These screws are available with a fully spherical ball or with a flat-faced ball and with a plain or ribbed surface. Thanks to the size expansion, these fixture elements are now available from stock - depending on the version selected - with diameters of M4 x 0.35 to M8 x 1 and lengths of 7.5 to 21.2 mm.
Users opting for the aforementioned models can choose between a ball made from hardened ball-bearing steel or hardened stainless steel. Better yet, Erwin Halder KG also offers versions that come with a fully spherical / flat-faced ball made from thermoplastic that is ideal for parts which are brittle and sensitive to pressure. Finishing off the selection is a short version with a plain, flat-faced ball. This version is ideally equipped to clamp cylindrical shafts with DIN 1835 E in combination with Whistle Notch or Weldon tool holders.