Double Head Thread Rail Track Spike

Thread spike of main geometrical parameters: (a) large diameter/tooth outside diameter (D, D) : for the external thread tooth top or the bottom of the thread within overlapping imaginary cylinder diameter. Thread basic on behalf of the big diameter size of nominal diameter. (2) in diameter (D2, D2) : D2 = D2 = D (D) - 2 x3h / 8, the type of H for the original triangle high: H = 3/2) (a) P = 0.866025 P (Angle of 60 o m.); H = 0.960491 P (55 o m. Angle) (3) the path/tooth bottom diameter (D1, D1) : for male tooth top or female crest of collocated assumptions the diameter of the cylinder. (4) pitch (P) : the adjacent teeth on the pitch diameter line corresponding to the axial distance between adjacent m. or the distance between the two adjacent tooth valley. In English every inch (25.4 mm) to indicate the number of teeth within the tooth pitch (5) type tooth half Angle (alpha / 2) : the tooth side and thread Angle between the vertical axis, the ordinary type of thread half Angle of 60 o / 2, Webster's teeth (BSW) type of thread half Angle of 55 o / 2. General wood screw m. Angle of 60 O, tail tip Angle of 60 O. Screw (6) combined length: for two phase matching thread, along the length of the screw axis rotary part of each other. Four, thread spike (tapping, drilling) the main geometric parameters: (a) large diameter/tooth outside diameter (d1), as the imaginary cylinder diameter of thread top overlap. Thread basic on behalf of the big diameter size of nominal diameter. (2) the path/tooth bottom diameter (d2) : for the imaginary cylinder diameter of thread bottom overlap. (3) the tooth pitch (p) : the adjacent teeth on the classics in line corresponding to the axial distance of two points. In English every inch (25.4 mm) to indicate the number of teeth within the tooth pitch. Drlling screw: drlling screw have CSD (mechanical), BSD (tapping AB) two kinds. The tooth length or Tooth number respectively reference machine screws (CSD) and self-tapping screws (BSD). M. in Angle and the tail Angle: m. Angle for side of tooth and tooth Angle between the side and Angle of threaded end Angle. 1, self tapping: m. Angle of 60 o, tail tip Angle of 45 o + 5 o. 2, wallboard nails: m. Angle of 60 o, (also can produce according to customer requirements, such as 45 o + 5 o) tail tip Angle of 25 + / - 3 o o. 3, plywood, nails: (Chip board screws) m. Angle of 40 O + 3 O, tail tip Angle of 25 + / - 3 O O or 34 O + 3 O (customer special requirement). 4, drlling screw: m. Angle of 60 o + 5 o, tail for different specifications of products to choose different types of clip tail needle, the main geometric parameters of the clip tail clip tail diameter and volume. url:http://www.railwayfishplate.com