Thread rolling screws are designed for reliable and secure fastening into materials such as plastic. They have a trilobular lobed cross-section, and form threads in pre-existing holes by pushing material outward during installation. When installed in sheet metal, thread rolling screws often require an extruded hole; the extrusion forms a lead-in and provides extra length for improved retention. Thread rolling screws are popular for applications where the loose chips formed by thread cutting processes must be avoided.
Incoterm : FOB shanghai or CIF destination port Payment : T/T . L/C . D/P Delivery : Within 30 days . Unless otherwise specified . Packing : Small box or plastic bag packing into stronger outside carton .then onto wooden pallet . Quality claim : we accept to proceed reparations or instead of cargos after shipping one year .