PRODUCTS BÜLTE uses its head


BÜLTE Plastics has added to its range of hex head slotted screws a new dual drive version, the PLAS 182.


T Hall: 6 Stand: K145


he hex head slotted screw PLAS 182 has applications in various industries including electronics, machinery, furniture and engineering. The slotted hex head offers two choices of tightening either the hexagon external drive with a spanner/socket or the slot with a screwdriver. The extension under the head provides a larger bearing surface to spread the load and preserve the work piece.


Incorporated into the screw, it also avoids the need of a separate washer. The PLAS 182 is available in M4, M5, M6, M8 and M10, with lengths varying between 6mm and 80mm. The standard material is


natural nylon (polyamide 6,6). BÜLTE explains that plastic provides clear advantages over metal as it’s lighter, stainless and doesn’t conduct electricity. In addition, it has high hardness, good resistance to abrasion, and its resistance remains high over a wide temperature range (-30°C to +100°C). The PLAS 182 screws are also available in PVDF, PE, PC or PP, polymers which are more resistant to dilute acids and


recommended for their food and medical qualities. Another material proposed by BÜLTE is nylon glass filled, which improves the mechanical properties of PA especially tensile strength. On the aesthetic point of view, the hex head slotted screws can suite all applications and can be manufactured in all RAL colours.


SHEETtracs®


problem occurs that the thickness of the components to be joined has to correspond to the pitch of the used sheet metal screw as a minimum requirement. A repeat assembly is still often not possible, since partly only one thread is engaged in the sheet metal. For this reason so called thin sheet metal screws have become


C


popular in the market place in recent years. These screws have a metric 60° thread and in most cases a conical tip. The advantage of this metric thread is the smaller pitch compared to sheet metal screws, which enables more thread engagement in the thin sheet metal.


combats thin sheet problems


A few years ago sheet metals 1mm or thicker were the rule. The demands on the joint could still be realised with common sheet metal screws, although often with a matching clip-on washer or preparation of the pressed hole. Today that sheet thickness is constantly being reduced to save cost and the challenge of process-capable repeat assembly of pre-drilled, thin sheets presents a greater than ever challenge.


onsidering the thickness reduction of the sheet metal and adherence to DIN 7975 for sheet metal joints, the


However, most times the formed female thread - and not the


screw - is the real weak spot of the joint. EJOT recognised this potential and developed a thin sheet metal screw for process capable assembly in thin sheet metal with a pre-hole. The EJOT SHEETtracs has a 45° (30°/15°) asymmetric flank angle, which creates a more stable female thread in the sheet metal because of the lower material displacement. In this way the torque level of the joint is increased and a repeat assembly becomes possible. In the lower, conical part of the screw the flank angle is turned


round and thus the extrusion is formed mainly in the screw-in direction. The non-circular thread forming zone enables an easy and centred application and the increased thread area secures a safe entering into the sheet metal. The circular cross section in the upper, bearing part of the


thread results in a higher flank coverage in the sheet metal, compared to non-circular thread geometries. Thus the metric pitch of the SHEETtracs enables a trouble free replacement, in the instance of a repair.


Shortening machine time for difficult materials


The ability to manufacture geometrically complex parts economically from difficult to machine materials requires a great deal of know-how and technology.


m


bo Osswald says that its new high precision and efficient CNC lathes, combined with an ingenious tool concept, give it the technology for the shortest machining times for difficult materials.


The machining time is the relevant factor for parts costs,


particularly when it comes to high-alloy materials such as 1.4435, 1.4571 (B.S. 320S18, Aisi 316Ti) or 1.4404 (B.S. 316S11, Aisi 316L), for example. mbo Osswald highlights that with its CNC lathes complex


stainless steel turned parts can be manufactured quickly and cost-effectively to the highest quality standards. These new


automatic lathes can machine bar and shaft parts with diameters ranging between 4mm and 65mm up to an overall length of 650mm for small and large batches. mbo Osswald offers its customers a wide selection of


stainless, high-strength materials for a broad range of applications. For custom-produced parts a team of experts are available which is geared towards quickly satisfying special customer-specific requirements. “This team can work to drawing specifications and together


with the customer implement an application-specific solution, “ says sales manager, Gerlinde Ruck.


176 Fastener + Fixing Magazine • Issue 67 January 2011


Hall: 8 Stand: V43


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