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Main Geometric Parameters of Threaded Nails:(1) Major Diameter/External Thread Diameter (D, d): This is the diameter of an imaginary cylinder that coincides with the crest of the external thread or the root of the internal thread. The major diameter basically represents the nominal diameter of the t
Main Geometric Parameters of Threaded Nails:
(1) Major Diameter/External Thread Diameter (D, d): This is the diameter of an imaginary cylinder that coincides with the crest of the external thread or the root of the internal thread. The major diameter basically represents the nominal diameter of the thread.
(2) Pitch Diameter (D2, d2): D2 = d2 = D(d) - 2×3H/8, where H is the original triangle height: H = (√3 / 2)P = 0.866025P (60° thread angle); H = 0.960491P (55° thread angle).
(3) Minor Diameter/Root Diameter (D1, d1): This is the diameter of an imaginary cylinder that coincides with the crest of the internal thread or the root of the external thread.
(4) Pitch (P): The axial distance between corresponding points on the pitch diameter of adjacent threads, or the distance between adjacent crests or roots. In the imperial system, the pitch is indicated by the number of threads per inch (25.4 mm).
(5) Thread Flank Angle (α/2): The angle between the flank and a line perpendicular to the thread axis. The half-angle of a standard thread is 60°/2, and for Whitworth threads (BSW) it is 55°/2. Generally, the crest angle of wood screws is 60°, and the tip angle is 60°.
(6) Thread Engagement Length: The length along the thread axis over which two mating threads are engaged.
Main Geometric Parameters of Threaded Nails (Self-tapping, Self-drilling):
(1) Major Diameter/External Thread Diameter (d1): The diameter of an imaginary cylinder that coincides with the thread crest. The major diameter generally represents the nominal thread size.
(2) Minor Diameter/Root Diameter (d2): The diameter of an imaginary cylinder that coincides with the thread root.
(3) Pitch (p): The axial distance between corresponding points on the pitch diameter of adjacent threads. In the imperial system, the pitch is indicated by the number of threads per inch (25.4 mm).
Self-drilling Screws: Self-drilling screws have two types, CSD (machine thread) and BSD (self-tapping AB thread). Their pitch or thread count can refer to machine screws (CSD thread) and self-tapping screws (BSD thread) respectively.
(4) Crest Angle and Tip Angle: The crest angle is the angle between flanks of the threads, and the tip angle is the apex angle at the end of the thread.
1. Self-tapping threads: Crest angle 60°, tip angle 45° ± 5°.
2. Wallboard screws: Crest angle 60° (can also be produced according to customer requirements, e.g., 45° ± 5°), tip angle 25° ± 3°.
3. Chipboard screws: Crest angle 40° ± 3°, tip angle 25° ± 3° or 34° ± 3° (special customer requirements).
4. Self-drilling screws: Crest angle 60° ± 5°, the tip is selected according to different product specifications using different types of drill points, with the main geometric parameters of the drill point being the drill diameter and protrusion length.
Main Geometric Parameters of Threaded Nails:
(1) Major Diameter/External Thread Diameter (D, d): This is the diameter of an imaginary cylinder that coincides with the crest of the external thread or the root of the internal thread. The major diameter basically represents the nominal diameter of the thread.
(2) Pitch Diameter (D2, d2): D2 = d2 = D(d) - 2×3H/8, where H is the original triangle height: H = (√3 / 2)P = 0.866025P (60° thread angle); H = 0.960491P (55° thread angle).
(3) Minor Diameter/Root Diameter (D1, d1): This is the diameter of an imaginary cylinder that coincides with the crest of the internal thread or the root of the external thread.
(4) Pitch (P): The axial distance between corresponding points on the pitch diameter of adjacent threads, or the distance between adjacent crests or roots. In the imperial system, the pitch is indicated by the number of threads per inch (25.4 mm).
(5) Thread Flank Angle (α/2): The angle between the flank and a line perpendicular to the thread axis. The half-angle of a standard thread is 60°/2, and for Whitworth threads (BSW) it is 55°/2. Generally, the crest angle of wood screws is 60°, and the tip angle is 60°.
(6) Thread Engagement Length: The length along the thread axis over which two mating threads are engaged.
Main Geometric Parameters of Threaded Nails (Self-tapping, Self-drilling):
(1) Major Diameter/External Thread Diameter (d1): The diameter of an imaginary cylinder that coincides with the thread crest. The major diameter generally represents the nominal thread size.
(2) Minor Diameter/Root Diameter (d2): The diameter of an imaginary cylinder that coincides with the thread root.
(3) Pitch (p): The axial distance between corresponding points on the pitch diameter of adjacent threads. In the imperial system, the pitch is indicated by the number of threads per inch (25.4 mm).
Self-drilling Screws: Self-drilling screws have two types, CSD (machine thread) and BSD (self-tapping AB thread). Their pitch or thread count can refer to machine screws (CSD thread) and self-tapping screws (BSD thread) respectively.
(4) Crest Angle and Tip Angle: The crest angle is the angle between flanks of the threads, and the tip angle is the apex angle at the end of the thread.
1. Self-tapping threads: Crest angle 60°, tip angle 45° ± 5°.
2. Wallboard screws: Crest angle 60° (can also be produced according to customer requirements, e.g., 45° ± 5°), tip angle 25° ± 3°.
3. Chipboard screws: Crest angle 40° ± 3°, tip angle 25° ± 3° or 34° ± 3° (special customer requirements).
4. Self-drilling screws: Crest angle 60° ± 5°, the tip is selected according to different product specifications using different types of drill points, with the main geometric parameters of the drill point being the drill diameter and protrusion length.
