US standard screw
a. Generally marked with a number, such as #2-56, #4-40, #6-32, #8-32, #10-24...etc.
b. or expressed in English outer diameter,
Such as 0.086-56, 0.112-40, 0.138-32, 0.164-32, 0.190-24...etc.
Ex: 632 – 8 – PPB:
Finish Code: Appearance Processing Specifications
Head Code: Head shape
Drive Code: Head section, feature model
Length Code: Screw length
Thread Code: Screw Model
B-1: Thread Code: Screw Model
Commonly used specifications are as follows:
a. #2-56 (0.086-56): 2 Fan 56 teeth
b #4-40 (0.112-40) : 4 番 40 teeth
c. #6-32 (0.138-32) : 6 32 teeth
d. #8-32 (0.164-32) : 8 Fan 32 teeth
e. #10-24 (0.190-24): 10 Fan 24 teeth
***Tooth is the number of teeth per ..***
B-2: Length Code: Screw length
The length of the US standard screw must be converted to the metric mm size.
Conversion formula: (Length Code / 32) x 25.40 = metric length mm
B-3, B-4, B-5: The marking method is the same as the metric system.
Flashlight Torch
flashlight is a handheld electronic lighting tool, usually consisting of battery powered bulb and focusing mirror. The history of the flashlight can be traced back to the early development of human society, from torches, oil lamps, candles to electric lamps, and finally developed into the modern LED flashlight. The invention of the flashlight combined the invention of the battery and the light bulb, and despite its relatively simple design, it was not widely used until the late 19th century. Early flashlights have a Flashlight that doesn't hold enough battery power, and it's called a "flashlight," meaning a short light. With the advancement of technology, flashlights have undergone many changes, from incandescent bulbs to xenon bulbs, and finally developed to modern LED flashlights.
There are many types of modern flashlights, including strong flashlights, rechargeable flashlights and so on. The strong flashlight uses light-emitting diode (LED) as the light source, which has the advantages of power saving, durability and strong brightness. Rechargeable flashlight is a handheld electronic lighting tool that can be used for repeated charging, usually using LED bulbs, long life, suitable for night out, power outage lighting. In addition, there are multi-function hand flashlight, using the principle of hand power generation, can be used for emergency lighting or for mobile phones and other digital products charging.
Flashlights are not only used for daily lighting, but also play an important role in emergency situations. For example, multifunctional hand torches generate electricity by hand, providing lighting and charging functions for environments without power. Military flashlights (also known as tactical flashlights) are widely used in military and police operations because of their high brightness, high illumination and strong light suppression.
Flashlight Rechargeable, Mini Flashlight for Camping,Mini Flashlight LED COB
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