M85049/39S25S

Series:	Military, SAE AS85049
Part Status:	Discontinued at Digi-Key
Lead Free Status / RoHS Status:	--
Type:	Cable Clamp
Moisture Sensitivity Level (MSL):	--
Cable Opening:	0.418" ~ 0.853" (10.62mm ~ 21.67mm)
Diameter - Outside:	1.889" (47.98mm)
Shell Size - Insert:	25
Thread Size:	M37x1
Cable Exit:	90°
Material:	Steel
Plating:	--
Shielding:	Unshielded
Color:	--
Features:	Clamp Screws, Self-Locking
Ingress Protection:	--
Includes:	--
Material Flammability Rating:	--
For Use With/Related Products:	MIL-DTL-38999 Series III, IV

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M85049/39S25S Application Field and Working Principle

Circular connectors are widely used in different fields as an essential part of electronics devices, particularly in aircrafts and rockets. The M85049/39S25S series of connector is a series of backshells and cable clamps belonging to circular connectors. Compared to other circular connectors, it has a higher temperature and pressure resistance, making it suitable for space application. The M85049/39S25S (M85049/39S series) is specially designed for aerospace equipment where high temperature and pressure are involved. It conforms to MIL-DTL-85049I specifications and consists of three parts: backshell, clamp and strain relief.

Backshells and Cable Clamps

Backshell: The backshell is a shell-like covering of the connector body. It is designed to protect the wires of the connector from vibration and abrasion thus extending its service life. It also has the important role of relieving strain on the cables, which helps reduce damage or attrition on the cable over time. Backshells are usually made of plastic, stainless steel, brass and aluminum die-cast. In the case of M85049/39S series, they are made of stainless steel, and other materials can also be specified in the order. Cable Clamps: Cable clamps are used to secure the cable to the connector body and provide strain relief. They are usually made of stainless steel and are designed to withstand high temperature and pressure. In the M85049/39S series, the cable clamps can be ordered separately, in different sizes and lengths, to meet various cable specifications.

Working Principle

The M85049/39S series of connectors are designed to fit into mating components, such as terminations, grommets, etc, in an aircraft or a spacecraft. These connectors consist of three parts: the backshell with attached strain relief, the clamp and the body with attached terminal contact. The backshell and the clamp are secured into place by means of a clamping ring. This ring is usually tightened with a tool or with a threaded spindle connector. The strain relief is used to secure the wire into place and also provides a secure connection between the two parts. In the case of the M85049/39S series, the strain relief is also designed to provide the highest temperature and pressure resistance. The contact body is usually made of gold or features a nickel plated brass body. It is also designed to withstand temperatures up to 500 degrees Celsius. The contacts are inserted into the mating component and then the connector body is tightened. This helps provide optimal electrical connection between the contacts.

Conclusion

The M85049/39S series from circular connector consists of backshells and cable clamps and is widely used in aerospace applications. Its design, including the backshells and cable clamps, provides maximum temperature and pressure resistance compared to other connectors. The connector itself consists of three parts: backshell, clamp and contact body, which are all carefully designed to provide secure and reliable connections.

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