K Series

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Solder-type general purpose circular connector
  •   Specially threaded coupling lock for easy mating and un-mating
    To mate connector push in the plug, then rotate and fix coupling nut. The coupling nut utilizes special threads (square threads) so mating and un-mating can be done easily with just a slight rotation.
  •   Light and robust
    Outer shell is made of light and robust aluminum die-cast material. This product has excellent reliability, with development based on MIL-DTL-5015 (US military standard).
  •   Stable contact connection
    Pin and socket contacts are precisely made from copper alloy with superior conductivity. For contact area of socket contact, beryllium copper with spring characteristics are wound around for a constantly stable pin and socket connection.
  •   Close-fit structure
    The opening for the socket insulator and the socket contact in which the pin contacts are inserted have a close-fit (perfectly cylindrical) structure which keeps the socket contact in a constant excellent condition since there is no effect on the spring area. This is important for maintaining a good connection even if twisting occurs inside the socket contact, and also for preventing the insertion of parts, such as test terminals, with a diameter wider than the pin.
  •   Mis-mating countermeasure
    Positioning guide key and key groove on metal shell connection area (barrel). Connector will always be mated correctly guided by this key.
  •   Securing wire holes to prevent un-mating
    For circumstances when strong vibration and shock is applied to connector, wire can be passed through the hole on the coupling nut to fix and prevent loosening of the nut. Not needed for regular use.
  •   Applications:
    Broadcasting equipment, sound equipment, communication devices, etc.

General Specifications

Current10 A/ pos. (Note 1))
Contact resistance (initial)Voltage drop 49 mV max. (test current 13A)
Dielectric withstanding voltage1300 VAC (1 minute)
Insulation resistance5000 megohm min. (DC 500V energized)
Operating temperature range-55 to +85 deg. C
Applicable wire sizeAWG #16 (1.25 mm2) max.
Mating cycles500 times

Product ListShow allCustomize

Status RoHS compliant REACH compliant Class Connector styles Number of positions Shell size Contact shape (Mating part) Wire termination method Coupling styles Contact arrangement code Contact size * No. of contacts Contact size Applicable wire size (mm2 max.) Applicable wire (AWG No.) Cable entry diameter (Applicable cable size) (mm) Finish of contact in contact area Rated current (A max.) Total current rating (A max.) Dielectric withstanding voltage (VACr.m.s. 1minute) Insulation resistance (megohm min.) Contact resistance (milliohm max.) Waterproof Operating temperature range (deg. C) Alternative insert position (deg.) Outer shell color Applicable contacts Applicable accessory Contact strip or loose piece Tool type Accessory type Applicable product part numbers Remarks
Active Yes CONNECTOR ASSEMBLY Straight plug 37 F Socket Soldering Threaded #16*37 #16 1.25 #16 AWG 19.4 to 22.2 Silver plating 10 74 1300 5000 1.05 None waterproof -55 to +85 0 Zinc plating FK-60A-2-R,FK-AD2-R
Active Yes CONNECTOR ASSEMBLY Straight plug 37 F Pin Soldering Threaded #16*37 #16 1.25 #16 AWG 19.4 to 22.2 Silver plating 10 74 1300 5000 1.05 None waterproof -55 to +85 0 Zinc plating FK-59A-2-R,FK-AD2-R
Active Yes CONNECTOR ASSEMBLY Box mounting receptacle 37 F Socket Soldering Threaded #16*37 #16 1.25 #16 AWG Silver plating 10 74 1300 5000 1.05 None waterproof -55 to +85 0 Zinc plating FK-60A-2-R
Active Yes CONNECTOR ASSEMBLY Box mounting receptacle 37 F Pin Soldering Threaded #16*37 #16 1.25 #16 AWG Silver plating 10 74 1300 5000 1.05 None waterproof -55 to +85 0 Zinc plating FK-59A-2-R
Active Yes ACCESSORY Accessory F None waterproof -55 to +85 Zinc plating Dust cap FK-37-21C-7/8-R,FK-37-31S-R For socket insert
Active Yes ACCESSORY Accessory F None waterproof -55 to +85 Zinc plating Dust cap FK-37-22C-7/8-R,FK-37-32S-R For pin insert
Active Yes ACCESSORY Accessory F None waterproof -55 to +85 Zinc plating Barrel adapter FK-37-21C-7/8-R,FK-37-22C-7/8-R
Active Yes CONNECTOR ASSEMBLY Straight plug 27 N Socket Soldering Threaded #16*27 #16 1.25 #16 AWG 16.3 to 19 Silver plating 10 54 1300 5000 1.05 None waterproof -55 to +85 0 Zinc plating NK-60A-2-R,NK-AD1-R
Active Yes CONNECTOR ASSEMBLY Straight plug 27 N Socket Soldering Threaded #16*27 #16 1.25 #16 AWG 19.4 to 22.2 Silver plating 10 54 1300 5000 1.05 None waterproof -55 to +85 0 Zinc plating NK-60A-2-R,NK-AD1-R
Active Yes CONNECTOR ASSEMBLY Straight plug 27 N Pin Soldering Threaded #16*27 #16 1.25 #16 AWG 16.3 to 19 Silver plating 10 54 1300 5000 1.05 None waterproof -55 to +85 0 Zinc plating NK-59A-2-R,NK-AD1-R
Active Yes CONNECTOR ASSEMBLY Straight plug 27 N Pin Soldering Threaded #16*27 #16 1.25 #16 AWG 19.4 to 22.2 Silver plating 10 54 1300 5000 1.05 None waterproof -55 to +85 0 Zinc plating NK-59A-2-R,NK-AD1-R
Active Yes CONNECTOR ASSEMBLY Box mounting receptacle 27 N Socket Soldering Threaded #16*27 #16 1.25 #16 AWG Silver plating 10 54 1300 5000 1.05 None waterproof -55 to +85 0 Zinc plating NK-60A-2-R,NK-AD1-R
Active Yes CONNECTOR ASSEMBLY Box mounting receptacle 27 N Pin Soldering Threaded #16*27 #16 1.25 #16 AWG Silver plating 10 54 1300 5000 1.05 None waterproof -55 to +85 0 Zinc plating NK-59A-2-R,NK-AD1-R
Active Yes ACCESSORY Accessory N None waterproof -55 to +85 Zinc plating Dust cap NK-27-21C-3/4-R,NK-27-21C-7/8-R,NK-27-31S-R For socket insert
Active Yes ACCESSORY Accessory N None waterproof -55 to +85 Zinc plating Dust cap NK-27-22C-3/4-R,NK-27-22C-7/8-R,NK-27-32S-R For pin insert
Active Yes ACCESSORY Accessory N None waterproof -55 to +85 Zinc plating Barrel adapter NK-27-21C-3/4-R,NK-27-21C-7/8-R,NK-27-22C-3/4-R.NK-27-22C-7/8-R

Notice


Status RoHS compliant REACH compliant
Class Connector styles Number of positions
Shell size Contact shape (Mating part) Wire termination method
Coupling styles Contact arrangement code Contact size * No. of contacts
Contact size Applicable wire size (mm2 max.) Applicable wire (AWG No.)
Cable entry diameter (Applicable cable size) (mm) Finish of contact in contact area Rated current (A max.)
Total current rating (A max.) Dielectric withstanding voltage (VACr.m.s. 1minute) Insulation resistance (megohm min.)
Contact resistance (milliohm max.) Waterproof Operating temperature range (deg. C)
Alternative insert position (deg.) Outer shell color Applicable contacts
Applicable accessory Contact strip or loose piece Tool type
Accessory type Applicable product part numbers Remarks