Lincoln Electric IM774 CobraMAX K2252-1 & K2252-2 - Manual (Page 15)

CobraMAX™ Owner's Manual - Page 5
Contact Tips
Heavy Duty Contact Tip - 3/8" Diameter*
Wire Size Tip ID Arc
Tip Length
MK Part No LE Part No
.030” (0.8mm) .040” (1.0mm) Spray 1.57” (39.9mm) 621-0390-25 KP2217-1B1
Short 1.82” (46.2mm) 621-0396-25 --
.035” (0.9mm) .045” (1.1mm) Spray 1.57” (39.9mm) 621-0391-25 KP2217-2B1
621-0391-250 †
621-0391-500 ††
.035" (0.9mm) .045" (1.1mm) Short 1.82” (46.2mm) 621-0397-25 --
.045" (1.1mm) .054" (1.37mm) Short 1.82” (46.2mm) 621-0398-25 --
3/64” (1.2mm)
(5356 Alloy)
.054” (1.37mm) Spray 1.57” (39.9mm) 621-0392-25 KP2217-3B1
621-0392-250 †
621-0392-500 ††
3/64” (1.2mm)
(4043 Alloy)
.060” (1.5mm)
Spray 1.57” (39.9mm) 621-0393-25** KP2217-4B1
621-0393-250 †
621-0393-500 ††
1/16” (1.6mm) .074” (1.9mm) Spray 1.57” (39.9mm) 621-0394-25 KP2217-5B1
.085” (2.16mm) Spray 621-0395-25
* Use of tip removal tool is recommended † Also sold in quantities of 250
**This size tip furnished with gun † † Also sold in quantities of 500
Gas Cups
Cup Size
Cup I.D.
MK P/N LE P/N
No. 6 3/8" (9.5mm) 621-0420 KP2249-1
No. 8* 1/2" (15.8mm) 621-0421 KP2250-1
No. 10 5/8" (15.8mm) 621-0422 KP2251-1
*standard - furnished with gun
Gas Cups
Spring Loaded Contact Tip - 3/8" Diameter*
Wire Size Tip ID Arc
Tip Length
MK Part No LE Part No
.030” (0.8mm) .040” (1.0mm) Spray 1.57” (39.9mm) 621-0331 KP2662-1
.035” (0.9mm) .045” (1.1mm) Spray 1.57” (39.9mm) 621-0332 KP2662-2
3/64” (1.2mm) .054” (1.37mm) Spray 1.57” (39.9mm) 621-0333 KP2662-3
3/64” (1.2mm) .060” (1.5mm) Spray 1.57” (39.9mm) 621-0334 KP2662-4
1/16” (1.6mm) .074” (1.9mm) Spray 1.57” (39.9mm) 621-0335 KP2262-5
* Use of tip removal tool is recommended
Spring Loaded Tips
The use of the Spring Loaded Tips has shown to improve wire to tip
contact significantly, especially while welding aluminum in DC Pulse Mode.
Incorporating a wrap-around spring material, a ceramic "puck" pushes up
against the wire forcing the wire to make 100% positive contact with the
internal face of the contact tip.
The constant touching of the wire to the tip eliminates "electrical gaps" in the
welding voltage sensing loop, which many welding power sources utilize for
sensing arc voltage values.