MK Products Welding Supplies & Equipment

MK Products — The Original Push-Pull MIG Gun Company, Made in the USA Since 1966

MK Products is the original inventor of push-pull MIG wire feed technology and, more than five decades later, remains the recognized world leader in aluminum MIG welding guns and wire feed systems. Founded in 1966 by Mike Kensrue in a household garage in Irvine, California, the company now operates out of a nearly 100,000 square foot manufacturing facility at 16882 Armstrong Avenue, Irvine, CA 92606 — still family-owned, now in its fourth generation. Every gun, wire feeder, turntable, and orbital weldhead that leaves the MK Products facility is proudly made in the USA.

The Cobramatic® push-pull wire feed system — MK Products' founding innovation — solved the most persistent problem in aluminum MIG welding: reliably feeding soft aluminum wire through long torch cables without bird-nesting, buckling, or inconsistent delivery. A standard push-only wire feeder pushes wire from the cabinet to the gun. At cable lengths beyond 10–12 feet, soft 4043 or 5356 aluminum wire buckles inside the cable, causing erratic arc starts, inconsistent wire speed, and weld defects. The Cobramatic system adds a synchronized pull motor in the gun head that works in concert with the cabinet's push motor to maintain positive wire tension throughout the cable — enabling reliable, production-quality aluminum MIG welding at cable lengths up to 50 feet. That technology, first patented by MK Products in 1966, is the reference standard against which every push-pull system in the industry is still measured.

WeldingMart is an authorized MK Products dealer stocking the full lineup: Cobramatic push-pull wire feeders, Python® push-pull gooseneck guns, Prince XL® spool guns, CobraTurn® digital welding turntables, CobraTig® orbital TIG welding systems, contact tips, barrel liners, drive rolls, conduit, nozzles, and all replacement consumables for legacy and current MK gun platforms. All orders ship from our Appleton, WI warehouse.

How to Choose MK Products for Your Application

MK Products' lineup covers four distinct application categories. Work through these to identify the right system for your operation.

1. Aluminum MIG Welding — Push-Pull Required

If you are MIG welding aluminum at cable lengths beyond 10–12 feet, on a production schedule, or with wire diameters below .035", a push-pull system is not optional — it is the only reliable method. The Cobramatic® Pro Series cabinet paired with a Python® or Cobra® MX gooseneck gun is the industry-standard solution. The Cobramatic system accepts all MK Products gooseneck guns, enabling you to swap gun heads without replacing the feeder. For applications where the feeder needs to be decoupled from the power source, the CobraMig 300 integrated aluminum MIG welder with CobraLoc™ gives full portability. Select cable length (15 ft or 25 ft standard) and amperage rating based on your joint type, duty cycle, and access requirements.

2. Aluminum MIG Welding — Spool Gun (Short-Run or Remote)

For operators who do not require long cable runs and prefer a self-contained gun with the wire spool mounted at the gun head, the Prince XL® spool gun is MK Products' answer. The Prince XL holds a 4" (1 lb) aluminum wire spool at the gun and feeds directly — no push-pull cabinet required. Rated at 225A air-cooled, the Prince XL ships in 7-pin Lincoln Electric-compatible and other configurations. A key advantage: the Prince XL can be converted from spool gun to a true push-pull gun by removing the spool assembly and installing a conduit, allowing the same gun body to operate with a Cobramatic cabinet when requirements change. See the Prince XL Owner's Manual for configuration details.

3. Long-Reach MIG and Hard-to-Access Welds

The Python® Advanced Gooseneck Gun is MK Products' flagship push-pull gun for demanding production environments. The Python's gooseneck geometry allows access to joints that straight-neck guns cannot reach, and the push-pull drive delivers consistent wire speed regardless of gun position — critical when welding overhead, in restricted-access assemblies, or in robotic or semi-automated fixtures. The Python is available in air-cooled (225A) and water-cooled configurations for 100% duty cycle production welding. Python guns are compatible with Lincoln Electric wire feed equipment via the 7-pin interface (model 232-825) and with other major brand feeders. The Python is distributed in over 40 countries and is recognized as the de facto global push-pull gun standard for aluminum welding.

4. Precision Positioning — Welding Turntables and Orbital Systems

Consistent weld quality on round or cylindrical parts requires rotating the workpiece through the weld rather than repositioning the gun. MK Products' CobraTurn® digital turntable series (T-30 and T-260) provides precision rotation with programmable speed, on/off foot control, and minimal runout for sheet metal fabricators, tube welding shops, and production assembly operations. For closed-groove orbital tube welding, the CobraTig® system delivers fully automated GTAW with the CobraTig 150 power source and Copperhead or DiamondBack weldheads — used in semiconductor, aerospace, pharmaceutical, and food-processing piping applications where weld consistency is a code requirement.

Top MK Products by Use Case

Cobramatic® Pro Series Push-Pull MIG System — Best for Production Aluminum MIG

The Cobramatic Pro Series is the foundational system: a Cobramatic cabinet (push motor, wire drive, controls) paired with your choice of MK Products gooseneck gun (Python, Cobra MX, Cobra SX, or Cobra X Series Digital). The Cobramatic accepts all current MK gooseneck guns and most legacy guns, making it a long-term platform investment rather than a one-time purchase. Use the Cobramatic Pro Series for any application where aluminum wire must travel more than 10–12 feet from feeder to weld pool — shipbuilding, aircraft component fabrication, aluminum frame and chassis production, pressure vessel fabrication, and structural aluminum construction. Cable lengths from 15 ft to 50 ft are supported depending on wire diameter and gun configuration. Compatible with Lincoln Electric power sources.

Python® Push-Pull Gooseneck Gun — Best for Access and Versatility

The Python is MK Products' most specified production push-pull gun worldwide. Available in Lincoln Electric 7-pin compatible (model 232-825), and multiple other power-source-specific configurations, the Python delivers wire speeds from .030" to .062" aluminum and steel wire with the consistent tension the push-pull drive provides. Air-cooled rating: 225A. Water-cooled configurations available for 100% duty cycle operations. The Python ships in 25 ft cable length as standard. The gooseneck barrel geometry is particularly valuable in aerospace assembly, automotive chassis welding, and any job where torch angle changes between passes. Replacement triggers (005-0694), potentiometer kits (005-0695), handle kits (005-0699), and all consumables are stocked at WeldingMart.

Prince XL® Spool Gun — Best for Short-Run and Field Aluminum MIG

The Prince XL (model 319-725) is a 225A air-cooled spool gun mounting a 4" aluminum wire spool at the gun. 7-pin Lincoln Electric-compatible. Cable: 25 ft. The Prince XL is the right choice when a Cobramatic cabinet is not available, when cable run is short (under 10 ft from feeder to weld), or when the operator needs a standalone gun for field repair, short production runs, or remote locations. Conversion to push-pull operation with a Cobramatic cabinet is accomplished by removing the spool assembly and installing a conduit — the same gun body functions in both modes.

CobraTurn® T-30 and T-260 Digital Turntables — Best for Rotary Positioning

The CobraTurn T-30 (model 125-001) is a compact 30-lb capacity digital turntable for small to medium assemblies. The CobraTurn T-260 (model 127-008) is a heavy-duty 260-lb capacity unit with a programmable digital controller, foot control interface, and 3-jaw chuck option (005-0812) for centered fixture holding. Both units provide precise, repeatable rotation speed control essential for producing consistent weld beads on tube, pipe, and circular flanges. The foot control on/off kit (005-0747) and variable speed foot control (005-0746) add hands-free speed adjustment during welding. The Aircrafter T-250 (model 127-007) provides intermediate capacity between the T-30 and T-260 for mid-size assemblies. All CobraTurn models are manufactured in Irvine, CA.

MK Products Contact Tips, Barrel Liners, and Drive Rolls — Best for Consumable Stocking

MK Products consumables are OEM-specified for MK gun platforms. Using genuine MK consumables maintains arc consistency and wire-feeding precision that aftermarket tips and liners cannot reliably replicate. Key consumables in stock at WeldingMart: Python contact tips (.035" Spray Arc 25-pc, 621-0391-25; 100-pc, 621-0391-100), HD spray arc contact tips in .041" (621-0390), .053" (621-0392), and .060" (621-0393) ID; short arc contact tips (.035", 621-0397-10); Teflon barrel liners (white .030"–.035", 931-0137; gray .040"–1/16", 931-0145); knurled drive rolls (511-0101); insulated knurled drive roll kits (005-0363); finned gas cups in #8 (621-0249), #10 (621-0250), and #10HD (621-0251); and threaded wire conduit in 15 ft (615-0620-15) and 25 ft (615-0620-25) lengths.

MK Products Specifications Reference

Product	Model #	Amperage	Cooling	Cable Length	Connector	Wire Diameter Range	Gun Type
Python Push-Pull Gun (Lincoln)	232-825	225A	Air-Cooled	25 ft	7-Pin Lincoln	.030"–1/16"	Push-Pull Gooseneck
Python Push-Pull Gun (Miller)	291-825	225A	Air-Cooled	25 ft	10-Pin	.030"–1/16"	Push-Pull Gooseneck
Prince XL Spool Gun	319-725	225A	Air-Cooled	25 ft	7-Pin Lincoln	.030"–3/64"	Spool Gun / Convertible Push-Pull
CobraTurn T-30 Digital Turntable	125-001	—	—	—	—	—	Rotary Positioner (30-lb cap.)
CobraTurn T-260 Digital Turntable	127-008	—	—	—	—	—	Rotary Positioner (260-lb cap.)
Aircrafter T-250 Turntable	127-007	—	—	—	—	—	Rotary Positioner (250-lb cap.)
Python Contact Tips .035" Spray (100-pc)	621-0391-100	—	—	—	—	.035"	Contact Tip (Spray Arc)
Barrel Liner White .030"–.035"	931-0137	—	—	—	—	.030"–.035"	Teflon Barrel Liner (5-pc pkg)
Barrel Liner Gray .040"–1/16"	931-0145	—	—	—	—	.040"–1/16"	Teflon Barrel Liner (5-pc pkg)
Threaded Wire Conduit 25 ft	615-0620-25	—	—	25 ft	Threaded	—	Wire Conduit

Compatible Accessories and Process Supplies

MK Products guns and wire feeders are part of a complete aluminum MIG welding system. The following WeldingMart collections carry consumables and process supplies that work directly alongside MK Products equipment:

• MIG Welding Cables & Power Pins — Work cables, power pins, and cable assemblies for connecting MK Products wire feeders and power sources. MK Cobramatic systems use standard MIG cable connections — use this collection to match or extend cable assemblies to your installation.
• MIG Contact Tips — A broad selection of contact tips for MIG applications. For OEM MK Products-specific tips (Python spray arc, HD spray arc in .041"/.053"/.060", short arc, spring-loaded), shop within the MK Products collection directly. This collection carries tips for other gun platforms used alongside MK systems on the same floor.
• MIG Welding Wire — Aluminum filler wire in 4043 and 5356 alloys, and solid steel MIG wire. MK Products Cobramatic and Python systems are engineered to feed AWS A5.10 aluminum alloy wires (.030", .035", 3/64", 1/16") as their primary application. Match wire alloy and diameter to your base metal and joint specification. 4043 is the general-purpose aluminum filler for most structural aluminum work; 5356 provides higher tensile strength for marine and structural applications.
• Wire Feed Welders — Industrial wire feed welders and MIG power sources compatible with MK Products guns. Python and Prince XL guns connect to Lincoln Electric wire feeders via 7-pin interface; confirm power source output and duty cycle match your gun's amperage rating before purchasing.

Frequently Asked Questions — MK Products

What makes MK Products push-pull guns different from standard MIG guns?

A standard MIG gun is a passive component — the wire feeder pushes wire from the cabinet to the gun, and if the cable is long, curved, or the wire is soft, the wire can buckle or feed inconsistently. MK Products push-pull guns contain a synchronized pull motor in the gun head that works in tandem with the cabinet's push motor, maintaining positive wire tension throughout the cable length regardless of torch position or cable length up to 50 feet. This dual-motor, synchronized drive is MK Products' original 1966 patent and remains the engineering reason MK Products is specified for demanding aluminum welding work where a standard push gun would fail.

Do MK Products guns work with Lincoln Electric power sources and wire feeders?

Yes. The Python 232-825 and Prince XL 319-725 are specifically designed for Lincoln Electric compatibility via the 7-pin interface. MK Products guns connect to Lincoln Electric wire feed systems as the gun-side component of the push-pull system — your Lincoln feeder provides the push drive; the MK gun provides the synchronized pull. Verify that your specific Lincoln welder model supports the 7-pin push-pull interface; most Lincoln Electric industrial wire feeders do. For other power source brands, MK Products offers alternative connector configurations.

What wire diameters does the Cobramatic system handle?

The Cobramatic system handles aluminum and steel wire from .030" to 1/16" diameter. Each wire diameter requires the matching barrel liner (Teflon white for .030"–.035", Teflon gray for .040"–1/16") and the corresponding contact tip ID. The most common aluminum diameters — .030", .035", 3/64", and 1/16" — are all fully supported with specific drive roller and liner configurations available from WeldingMart. Using the correct liner for the wire diameter is not optional: a mismatched liner causes feeding resistance that defeats the purpose of the push-pull drive.

Why is a Teflon liner required for aluminum welding?

Aluminum wire is softer than steel wire and has a different surface texture. A steel wire liner has a helical wound structure with gaps that catch aluminum wire, shaving micro-particles off the wire surface and creating debris that causes feeding resistance, contamination in the weld pool, and contact tip wear. Teflon-lined (PTFE) barrels provide a smooth, low-friction bore that aluminum wire passes through without deformation. MK Products specifies Teflon barrel liners (white for .030"–.035", gray for .040"–1/16") for all aluminum welding applications — never use a steel wire liner for aluminum.

What is the difference between the Cobramatic Pro Series and the CobraMig 300?

The Cobramatic Pro Series is a wire feed cabinet designed to pair with a separate welding power source. You provide the power source (Lincoln Electric or other); the Cobramatic provides the push-pull wire drive, controls, and gun interface. The CobraMig 300 is an all-in-one integrated system: power source, Cobramatic push-pull wire feeder, and CobraLoc™ decoupling mechanism in a single roll-around unit. CobraLoc allows the feeder to physically separate from the power source for portability to the weld location while maintaining the wire feed connection. The CobraMig 300 simplifies system assembly and is the preferred solution when a standalone integrated aluminum MIG welder is required rather than adding push-pull capability to an existing power source.

What industries use MK Products Cobramatic systems?

MK Products Cobramatic systems are the standard in any industry that requires production-quality aluminum MIG welding: aerospace and defense (aircraft structures, satellite and missile components), marine and shipbuilding (aluminum hull and deck fabrication), automotive and motorsports (aluminum chassis, body, and suspension components), rail (aluminum passenger car bodies and structures), oil and gas (aluminum pressure vessel and piping fabrication), construction (structural aluminum), and general manufacturing wherever aluminum assemblies require consistent, high-quality weld beads. MK Products equipment is distributed in over 40 countries.

How often should MK Products contact tips and barrel liners be replaced?

Contact tip service life depends on wire diameter, amperage, duty cycle, and shielding gas mix. Under normal conditions, MK Products spray arc contact tips in high-production applications should be inspected every shift and replaced when the bore shows visible elongation, when spatter buildup causes feeding resistance, or when arc start quality degrades. HD chrome-zirconium tips (621-0392, 621-0393) outlast standard copper tips in high-amperage spray arc applications. Barrel liners should be replaced whenever wire feed drag increases, when the liner bore shows visible wear grooves, or when aluminum shavings are visible at the contact tip during tip removal. Stocking a spare set of tips and one spare liner per gun eliminates unplanned downtime from consumable wear.