These core hole diameters are based on actual tests made by manufacturers and users, depending on various materials, material thickness or drive-in depths.
These values are for guidance only and, especially, in mass production, it is recommended that one's own tests be carried out in order to achieve an optimal result. The test requirements according to DIN 7500 Part 1 may offer useful assistance.
Manufacturing processes, e.g. punching, which cause cold work hardening of the hole wall, require a somewhat larger hole. The same may be the case with casted holes (harder casting scale). - Recommended tolerance field for these core holes : H 11 - St=st12 and St37-2 - Al=Al99,5F13 and AlMnF10 - Cu=E-Cu57F30, E-Cu58F30 and CuZnF38
The essential characteristic of tapping screw thread is its capability of forming chipless internal thread in the core hole of the material being joined. - These core hole data which are theoretically calculated and based on actual tests are valid for fasteners with tapping screw thread to DIN 7970 and only for application in metals with tensile strengths indicated in the tables. - They cannot be used for plastics. For this application several modifications of tapping screw thread have been developed.
Brass Electrical Plug Pins and Socket Pins Brass Pins from Free Cutting Brass IS 319 Type (I) or Brass Electrical Plug Pins and Socket Pins Brass Pins fromFree Cutting Brass as per BS 249 Type (I) or High Grade Free Cutting Brass. Any Special Brass Material Composition as per customers requirement.
Size :
As per customer requirements.
Threads :
ISO Metric (MM Threads) , BA Threads , BSW Threads (Inches) , UNC, UNF Threads , Any threads as per custom , design.
Finish and Coating :
Natural, Nickel Plated, Tin Plated, Natural Brass or any coating as per customer specification.
Deccan Industries Manufacturer and supplier of a wide range of nuts, washers, coupling nuts, cup washers, dome nuts, automotive nuts, pipe nuts, automotive washers and locking rings.
Kainya Wires Manufacturer and supplier of nails, wire nails, aluminium nails, aluminium wire nails, mild steel wire nails, house nails, mild steel house nails, aluminium house nails, mild steel wire nails and steel nails.
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