Standard parts include bolts, screws, studs, nuts, machine screws, self-tapping screws, washers, pins, rivets, and retaining rings. It is a basic part that is widely used in various aspects and its function is to act as a joint fastening. The coupling forms can be divided into detachable joints (using bolted, nut, etc. threaded fasteners) and permanent joints (using riveted joints).
Standard screw type
(1) Bolts:
1 Hexagon head bolt: Specifications d = M5 ~ M36, L = 8 ~ 300mm.
2 Semi-circular head square neck bolts: Specifications d = M6 ~ M16, L = 30 ~ 160mm.
3 High-strength large hex bolts: Specifications d = M12 ~ M24, L = 35 ~ 240mm.
(2) Studs: Double-headed studs and equal-length studs: Specifications d = M5 ~ M42, L = 16 ~ 300mm.
(3) Machine screws: Specifications d = M2 ~ M10, L = 3 ~ 100mm.
(4) Nuts:
1 Hexagon mother: Specifications d = M25 ~ M48.
2 High-strength large hex nuts: Specifications = M12 ~ M42.
(5) Self-tapping screws: Specifications d = M2.5 ~ M6, L = 6 ~ 40mm.
Standard screw pictures
(6) Washers:
1 flat washer: Specifications d = 2 to 30.
2 Spring washers: Specifications d = 2 to 48.
(7) Cylindrical pins:
1 Cylindrical pin, tapered pin: specification d = 1 ~ 30, L = 4 ~ 140mm.
2 Cotter pin: specification d=1 to 2, L=6 to 200mm.
(8) Rivets: Specifications d = 1.6 to 8, L = 3 to 50 mm.
(9) File ring:
1 Taper pin locks the collar and the screw locks the collar. The specification d = 8 to 30.
2 holes with elastic ring, bearing elastic ring: specifications d = 3 ~ 75.
Standard screw
Standard screw specifications
Standard part screw length is 6cm.
There are many combinations of screws, a combination of pan head screws, or round combination screws. There are also hexagonal screws. There are two combination screws and three combination screws. According to the material, there are iron and stainless steel. But no matter what. For the length of the combined screws, it is relatively simple.
The length of the general combination screw can be measured with a caliper. The method of measurement is to combine the length of the screw without the head. But including spring pads, flat pad thickness. That is, when measuring, it is the length of the thickness of the flat pad including the spring pad.
Standard size screws have the smallest size available to M2 (diameter of threaded rod, unlimited thread length). For example: M2.5 M3 M4 M5 M6 M8 M1 M12 M14 and so on (any length is not limited), yes, I Tell you about the size of the screw that is composed of oil: it consists of the length of the threaded rod of the screw (excluding the head), the thread (the distance between the thread and the thread), and the diameter of the threaded rod.
I use the above data to make an analogy. For example: the smallest size M2, its professional standard name is: M2-0.4X5 (M2 is the length of the threaded rod, 0.4 is the thread pitch, 5 is the diameter of the threaded rod). Generally, their materials are: 4.8 8.8 10.9 12.9 and so on. There are stainless steel, S04 S16, etc.