M Series Connectors ratchet coupling

Precision modular connectors to suit your application Since its creation in Switzerland in 1946 the LEMO Group has been recognized as a global leader of circular Push-Pull connectors and interconnect solutions. Today LEMO and its affiliated companies, REDEL and COELVER, are active in more than 80 countries with the help of over 40 subsidiaries and distributors. Over 90000 connectors The modular design of the LEMO range provides over 90000 connectors from miniature ø 3 mm to ø 50 mm, capable of handling cable diameters up to 30 mm and for up to 114 contacts. This vast portfolio enables you to...

Introduction This catalogue provides a complete description of the LEMO M series portfolio. M series connectors are lightweight triplestart ratchet coupling type connectors designed for avionics, military, security, motorsport and heavy duty applications. The M series is a COTS (Commercial Off-The-Shelf) product, that fulfills the harshest MIL-DTL-38999 requirements in a more compact and lightweight package. It features a very wide range of configurable options to fulfill every applications. The LEMO engagement for supplying innovative solutions which meets users highest expectations translates...

Technical characteristics Materials and treatments Shell material code 1) X C l 2) Outer shell, conical nut, coupling nut L Aluminium alloy (AA 6262A or AA 6023) Brass (UNS C 38500) Earthing crown Hexagonal nut Material (Standard) Surface treatment (µm) chrome Bronze (UNS C 54400) or special brass Male crimp contact Female crimp contact Cu-Be or special steel Special PEEK without treatment FPM/FKM (Viton®) Silicone Epoxy (Araldite®) (HEl) Cable rear seal Stainless steel Sealing resin Note: standards for surface treatment are as follows: chrome-plated SAE AMS 2460; nickel-plated SAE AMS QQ N 290...

Mechanical performance Characteristics Endurance Gunfire vibration Vibration-Sine 25 to 2000 Hz, 3 axis (Apache helicopter) EIA-364-28 test cond. V letter I Note: 1) amplitude: 30g. Frequency: 10 to 2000 Hz. Time per axis: 4 hours (X, Y, Z). 2) no signal discontinuity above 1 µs. Plug mating / unmating torque Series Coupling torque tightning (N.cm) Coupling torque untightning (N.cm) Coupling torque tightning (N.cm) Coupling torque untightning (N.cm) Note: indicative values, tightening torque may vary depending on insert configuration. Environmental performance Characteristics MIL-spec tests Standard...

M series The M Series connector offer a new innovative design for avionics, military, security, motorsport and heavy duty applications. When selected in one of the high-strength aluminium options, this connector is one of the lightest and most compact of the LEMO product line. A one-grip ratchet locking system enables quick and secure coupling of the connectors. The arctic grip makes it easy to manipulate the connector while wearing gloves or when the connector is located in a difficult to access area. Features: – Ratchet-coupling mechanism (less than 3/4 turn to seat) – Compact design for space...

Standard models part numbering system Plug Free socket Fixed socket Cable group: 1 = For LM.232 configuration (p. 27) Backshell options: (page 6) Blank = standard B = Ruggedized for heatshrink molded shapes T = Mold stop M = MIL-DTL-38999L shell thread Z = Standard for LM.232 configuration (page 27) Model: (page 7) Alignment key: (page 22) Series: (page 7) Insert configuration: (page 23) Housing: X = Nickel-plated aluminium alloy (standard) 1) C = Chrome-plated brass L = Anodized aluminium 2) Contact: (page 30) Insulator: L = PEEK (multipole page 23) R = PEEK (mixed multipole p. 25) FMN.1M.305.XLC...

Locking nuts options M Series connectors offer 2 different options for coupling nut allowing to adapt ergonomics according to use cases. l l The Knurled grip is the default choice for most applications as it offers a good level of grip whilst keeping a very compact overall plug diameter. The Artic grip offers maximum ergonomics enabling easy manipulation even with gloves. Knurled grip (standard) Arctic grip (variant) Backshell options M Series connectors offers 4 different backshell options allowing for various cable assembly attachments. Mold stop See page 35 for heatshrink boot Heatshrink molded...

Straight plug Backshell option Backshell option Reference Model Note: B, D and X dimensions are for standard backshell. For different backshell option see page 6.

Straight plug with square flange (these models are not IP68 due to the absence of panel sealing) Backshell option Backshell option FAl Non-locking straight plug L Note: for integration in a rackable application please contact us for detailed informations linked to coupling constrains. Backshell option Note: B, D and X dimensions are for standard backshell. For different backshell option see page

Fixed socket, nut fixing Ls/Lr G Crimp contacts Print contacts Panel cut-out (page 41). PCB drilling pattern (page 42). Note: Ls = standard gender, Lr = reverse gender (see page 22 for standard/reverse gender options). Fixed socket with two nuts (these models are not IP68 due to the absence of panel sealing) Ls/Lr S1 Crimp contacts Print contacts Panel cut-out (page 41). PCB drilling pattern (page 42). Note: Ls = standard gender, Lr = reverse gender (see page 22 for standard/reverse gender options).

Fixed socket with square flange Ls/Lr K Crimp contacts Print contacts Reference Model Panel cut-out (page 41). PCB drilling pattern (page 42). Note: Ls = standard gender, Lr = reverse gender (see page 22 for standard/reverse gender options). Fixed socket, nut fixing (back panel mounting) M Backshell option Panel cut-out (page 41). Note: Ls = standard gender, Lr = reverse gender (see page 22 for standard/reverse gender options). This model is not available with standard backshell option (backshell not supplied). For different backshell option see page 6. 1) Dimensions for MIL-DTL-38999M (series...

Fixed socket with square flange (these models are not IP68 due to the absence of panel sealing) M Backshell option Panel cut-out (page 41). Note: Ls = standard gender, Lr = reverse gender (see page 22 for standard/reverse gender options). This model is not available with standard backshell variant (backshell not supplied). For different backshell option see page 6. 1) Dimensions for MIL-DTL-38999M (series III) backshell connector size code (backshell not supplied) (not available in MM and 0M size). Free socket Ls/Lr Backshell option Backshell option Note: Ls = standard gender, Lr = reverse gender...