What are the specifications of self-locking tuning screws commonly used in RF communication products?

Self-locking tuning screws commonly used in RF communication products have various specifications. The following are some common specifications:

Divided by diameter

M2: It is suitable for some RF communication modules or small filters with extremely compact space requirements, low power and low frequency, such as small filter tuning in RF front-end modules inside some mobile phones.

M3: It is widely used for tuning common cavity filters and couplers in RF communication equipment with general power and frequency range, such as small cavity filters in RF units of some base stations.

M4: It is commonly used in RF communication products with medium power and frequency, such as some high-power cavity filters and diplexers, which can provide a more stable tuning and fixing effect, and is more common in the RF path of some small base stations or repeaters.

M5 and above: It is usually used in large-scale RF communication equipment, such as high-power base station filters and combiners. These equipment require higher strength and stability of tuning screws to withstand larger power and complex electromagnetic environment.

Divide by length

3mm-5mm: It is generally used for thin RF circuit boards or small filter cavities. In some portable RF communication devices, such as walkie-talkies, wireless network cards, etc., self-locking tuning screws of this length are often used for internal RF circuit tuning.

5mm-10mm: This is a common length range, which can meet the tuning requirements of filters, resonators and other components in most RF communication products, such as the tuning of various filters in the common base station RF subsystem.

10mm-20mm: It is suitable for some RF components with thick structure and deep tuning depth, such as large cavity filter or complex RF coupling network, which may be used in RF front-end of Hong Jizhan.

Divided by pitch

0.4mm-0.5mm: Self-locking tuning screw with fine pitch can achieve finer tuning accuracy, which is often used in RF communication equipment that requires high frequency accuracy, such as RF filter tuning in high-precision spectrum analyzer.

0.5mm-0.8mm: This is a common pitch range, which can ensure the tuning accuracy while giving consideration to the tuning speed and stability, and is suitable for most conventional RF communication products.

0.8mm-1.25mm: Self-locking tuning screw with coarse pitch has fast tuning speed, but relatively low accuracy, and can be used in some RF devices that do not require particularly high tuning accuracy, but need to complete tuning quickly, such as RF modules in some emergency communication devices.

According to the head shape

Hexagon socket: Hexagon socket self-locking tuning screw can provide large torque transmission, which is convenient for accurate tuning operation with Allen wrench, and the head is relatively small, which will not occupy too much space. It is widely used in various RF communication equipment, especially for products that require high spatial layout and tuning accuracy.

Cross groove: The screwdriver with cross groove self-locking tuning screw is easy to insert and easy to operate. It is often used in some RF communication products with low tuning frequency and simple use environment, such as some consumer-grade wireless devices.

Slot: Slot self-locking tuning screw has simple structure and low cost, but the screwdriver is easy to slip, which is generally used in some low-demand RF auxiliary components or low-end RF communication products.