Are Harris regulators CGA-certified?

Yes. All Harris gas pressure regulators are designed and tested to comply with CGA E-4 (Standard for Gas Pressure Regulators) and CGA V-1 (Compressed Gas Cylinder Valve Outlet and Inlet Connections). CGA compliance ensures Harris regulators use the correct inlet fitting for each gas type — CGA-580 for argon, helium, and nitrogen; CGA-540 for oxygen; CGA-510 or CGA-300 for acetylene.

Does Harris make MIG or TIG welding machines?

No. Harris Products Group specializes in gas apparatus (regulators, torches, cutting equipment), brazing and soldering alloys, and flux — not welding power sources. For MIG and TIG welding machines, WeldingMart carries Lincoln Electric, Harris's parent company.

What is the difference between Harris Stay-Silv and Sil-Fos brazing alloys?

Harris Stay-Silv alloys are silver-bearing brazing alloys (15%–56% silver) that require flux and are used for dissimilar metal joints including copper-to-brass, copper-to-steel, and copper-to-stainless. Harris Sil-Fos alloys are copper-phosphorus-silver alloys that are self-fluxing on copper-to-copper joints. Sil-Fos must NOT be used on iron, steel, or nickel alloys as phosphorus forms brittle phosphides with ferrous metals.

What CGA fitting do I need for my gas type?

CGA-580 for argon, helium, nitrogen, and inert gas mixes; CGA-540 for oxygen; CGA-510 (POL) for acetylene cylinders; CGA-300 for acetylene manifold connections; CGA-590 for industrial air. Harris regulators are available with the correct CGA inlet for each gas family. Never use adapters to connect a regulator to the wrong gas cylinder.

When was Harris Products Group founded and who owns it?

The Harris legacy begins in 1899 with John Harris's invention of the oxy-acetylene flame-cutting torch. Harris Calorific was incorporated in 1905. Lincoln Electric merged Harris Calorific and J.W. Harris Co. into The Harris Products Group on May 1, 2006. Harris is today a wholly owned subsidiary of Lincoln Electric Holdings, Inc. (NASDAQ: LECO).

What brazing flux should I use with Harris alloys?

Harris Stay-Silv White Flux is an all-purpose flux for copper, brass, bronze, and mild steel brazing applications. Harris Stay-Silv Black Flux is formulated for stainless steel brazing and extended heating cycles where standard fluxes fail. Always remove flux residue completely after brazing — it is corrosive and will degrade joints if left in place.

Are Harris products compatible with Victor torch equipment?

Harris cutting tips and torch components are designed to Harris specifications and are not universally interchangeable with other brands without verification. Harris one-piece NX tips (6290 Series) are Harris-specific. Harris two-piece tips in the 1700 and 1800 Series are compatible with a broader range of torch bodies. Harris regulators use standard CGA inlet connections compatible with any cylinder of the matching gas type regardless of torch brand.

What Is Harris Products Group?

Harris Products Group is a world leader in the manufacture and distribution of products used in brazing, soldering, welding, cutting, heating, and gas control. The company traces its origins to 1899, when inventor John Harris discovered the oxy-acetylene cutting method while conducting research on synthetic rubies — accidentally cutting through the metal plate beneath, he had invented the world's first flame-cutting torch. Harris exhibited that torch at the 1904 St. Louis World's Fair and founded the Harris Calorific Company in 1905. From that founding breakthrough, Harris went on to register many industry firsts: the first swaged cutting tips, the first multi-stage pressure regulators, the first gaugeless regulators, and the first safety torch and regulator check valves. (Project Suppliers — Harris History)

Meanwhile, in 1914, Joseph W. Harris Sr. founded the J.W. Harris Company, initially serving the automotive and farm equipment repair trades. J.W. Harris expanded aggressively into brazing and soldering alloys — developing many of the phosphorus-copper and silver-bearing brazing alloys that remain industry standards to this day. Lincoln Electric acquired Harris Calorific from Emerson Electric in 1990, then acquired the privately held J.W. Harris Co. in 2005. On May 1, 2006, Lincoln Electric merged the two businesses into a single entity — The Harris Products Group — combining over a century of gas equipment expertise with decades of brazing alloy metallurgy under one roof. (Manufacturing Today — Harris Products Group)

Today, Harris Products Group is a wholly owned subsidiary of The Lincoln Electric Company, operating manufacturing facilities in Mason, Ohio; Georgia; California; Poland; Mexico; Brazil; and Italy. Harris products are distributed in over 90 countries and are specified by OEM manufacturers in HVAC/R, aerospace, automotive, plumbing, and industrial fabrication. At WeldingMart, we are an authorized Harris dealer carrying the full product range — regulators, torch outfits, cutting tips, brazing alloys, flux, and specialty gas equipment — backed by same-day shipping on orders placed before 3 PM Central Time.

How to Choose Harris Products — by Application

Harris builds across four major application domains. Matching your application to the right Harris product line is the first step to getting the right result.

1. Brazing — Joining Copper, Brass, and Dissimilar Metals

Brazing uses a filler metal melted above 840°F (450°C) but below the base metal's melting point, drawn into the joint by capillary action. Harris offers three families of brazing alloys:

Stay-Silv (Silver Brazing Alloys): Silver-bearing alloys in 15%, 40%, 45%, 50%, and 56% silver content. Used for copper-to-copper, copper-to-brass, copper-to-steel, and dissimilar metal joints. Require Harris Stay-Silv flux. Classified to AWS A5.8 / ASTM B260. Best choice for HVAC/R refrigerant lines, plumbing, and aerospace applications where joint strength and leak-free performance are critical.
Sil-Fos / Stay-Silv Phos-Copper (Phosphorus-Copper Alloys): Self-fluxing on copper-to-copper joints — no separate flux required. Copper-phosphorus alloys with 0%, 2%, and 15% silver content (Sil-Fos 0, Sil-Fos 2, Sil-Fos 15). Widely used in refrigeration line fabrication, electrical bus-bar brazing, and plumbing. Do NOT use on iron, steel, or nickel-bearing alloys — phosphorus embrittles ferrous joints.
Safety-Silv (High-Silver Alloys): Premium alloys at 50% and 56% silver content for demanding joint geometries, close-tolerance work, and applications requiring maximum ductility and vibration resistance. Available in rod, wire, and flux-coated strip. Cadmium-free formulations available.

2. Soldering — Low-Temperature Metal Joining

Harris soldering alloys operate below 840°F (450°C). Applications include copper plumbing (water and gas lines), electronic assemblies, and light-duty metal joining. Harris ECO Smart flux and Harris tin-silver alloys are used where lead-free compliance (RoHS/NSF) is required for potable water systems. Choose soldering alloys when base metal distortion from brazing heat is a concern, or when service temperatures will remain below 200°F.

3. Cutting — Oxy-Fuel Flame Cutting

Harris is a foundational manufacturer of oxy-fuel cutting equipment — a heritage that goes back to the 1899 invention of the flame-cutting torch. Harris cutting torch outfits include torch handles, cutting attachments, oxygen and fuel gas regulators, hose sets, and cutting tips. Harris cutting tips are available in one-piece NX design (Harris 6290 Series) and two-piece design compatible with a range of torch handles. Harris cuts mild steel from light gauge sheet through heavy structural plate (6-inch and beyond with appropriate tip size). Key products for cutting applications: Harris 43 Series torch handles, Harris 62 Series heavy-duty cutting attachments, Harris 6290 NX cutting tips, and Harris 25GX and 3000 Series regulators. For machine cutting and automated oxy-fuel systems, Harris offers 98 Series machine cutting torches compatible with track burners and CNC oxy-fuel tables.

4. Gas Regulation — Shielding Gas, Specialty Gas, and Oxy-Fuel Pressure Control

Harris regulators cover the full range of industrial and specialty gas applications:

Welding shielding gas: Harris 355 and 356 Series flowmeter regulators for argon, argon/CO₂, and argon/helium shielding gas for MIG and TIG welding. CGA-580 inlet for argon and argon mix cylinders.
Oxy-fuel regulators: Harris 25GX Series single-stage and 9200 Series two-stage regulators for oxygen (CGA-540) and acetylene (CGA-510/300). The Model 25GX features 7-year Harris warranty coverage and a robust brass body.
Specialty and high-purity gas: Harris HP8700 Series high-purity regulators with stainless steel wetted surfaces for argon, oxygen, helium, nitrogen, hydrogen, and mixed specialty gases. Used in semiconductor, laboratory, and industrial process applications. CGA connections per gas type (CGA-580, CGA-540, CGA-580, CGA-350 etc.).
Station and pipeline regulators: Harris 447 Series station regulators for manifold and pipeline gas distribution, including the 447 IGG (Inert Gas Guard) series for argon and inert gas pipeline systems.

Top Harris Products by Use Case

Argon Shielding Gas — Harris 3100211 Flowmeter Regulator

The Harris 3100211 Flowmeter Argon Regulator (355-2Ar-58010) is the most widely used Harris regulator at WeldingMart. CGA-580 inlet, 0–60 CFH adjustable flow range, precision compensated flowmeter tube. Used on argon and argon/CO₂ cylinders for MIG and TIG shielding gas control. The 355 Series body features a durable brass construction, high-visibility flowmeter, and inlet check valve. This is the standard shop regulator for any welding operation running Lincoln Electric MIG or TIG equipment on shielding gas. Pairs directly with Harris torch outfits and Lincoln Electric MIG and TIG welders. See our Welding Gas Regulators & Pressure Control collection for the full range.

Oxy-Acetylene Cutting Torch — Harris 43 Series with 62-5 Cutting Outfit

The Harris 43-2 High-Flow Combination Torch Handle (Harris 1401150) pairs with Harris's 62 Series heavy-duty cutting attachment to form the backbone of professional oxy-acetylene cutting operations. The 43-2 handle features built-in check valves, high-flow mixer ports, and accepts both welding and cutting heads — making it a versatile one-handle solution for shops that switch between cutting, welding, and heating. For high-production cutting duty, the complete Harris 62-5 outfit includes the handle, cutting attachment, oxygen and acetylene regulators, 12.5-foot twin hose set, and carrying case. See our Harris Torch Outfits collection for complete cutting outfit configurations.

Silver Brazing Alloy — Harris Stay-Silv 45 and Sil-Fos 15

Two Harris brazing alloys cover the vast majority of HVAC/R, plumbing, and industrial brazing applications:

Harris Stay-Silv 45 (45% Silver): AWS BAg-5 classification. Cadmium-free. Flows at 1370°F (745°C) liquidus — the standard HVAC/R brazing alloy for copper-to-copper and copper-to-brass refrigerant line joints. Requires Harris Stay-Silv White Flux. Available in 1/16-inch rod and flux-coated strip.
Harris Sil-Fos 15 (Cu-15P, Stay-Silv 15 Phos-Copper): Self-fluxing on copper-to-copper joints. AWS BCuP-5 classification. Flows at 1190–1480°F (643–804°C). No flux required for copper-to-copper work. Ideal for refrigeration line sets, plumbing compression fittings, and electrical conductors. Available in 0.050 x 1/8-inch rod and wire forms.

Specialty Gas Regulation — Harris HP8700 Series

The Harris HP8700 Series high-purity regulators are built for specialty and laboratory gas applications where contamination-free delivery is required. Stainless steel wetted surfaces, corrosion-resistant body, and precision two-stage pressure reduction. Available for argon/krypton (CGA-580), oxygen (CGA-540), nitrogen (CGA-680), and other specialty gas connections. Inlet pressures to 4,500 PSI with adjustable delivery pressure ranges from 0–25 PSI to 0–125 PSI. Used in semiconductor processing, laboratory gas systems, and industrial purging applications. See our Harris Specialty Gas Regulators collection for all HP8700 variants.

Harris Product Specifications Reference

Product Line	Series / Model	Application	CGA Inlet	Key Spec	Standard
Argon Flowmeter Regulator	355 / 3100211	MIG/TIG shielding gas	CGA-580	0–60 CFH, 4,500 PSI inlet max	CGA E-4
Argon/He/N₂ Single-Stage	25GX-145 / 3000540	Inert gas, purging, TIG	CGA-580	0–145 PSI delivery, 7-yr warranty	CGA E-4
Single-Stage O₂ Regulator	25GX-145 / 3000510	Oxy-fuel cutting, welding	CGA-540	0–145 PSI delivery, 3000 PSI inlet	CGA E-4
Two-Stage O₂ Regulator	9200 / 3302214	Precision welding, consistent flow	CGA-540	0–125 PSI delivery, 3000 PSI inlet	CGA E-4
Acetylene Regulator	25GX-15 / 3000350	Oxy-acetylene cutting/welding	CGA-510	0–15 PSI delivery, 400 PSI inlet	CGA E-4
HP8700 High-Purity (Ar/Kr)	HP8700-2500-580	Specialty/lab gas, semiconductor	CGA-580	0–125 PSI delivery, 2,500 PSI inlet, SS wetted	SEMI
Stay-Silv 45 Brazing Alloy	45% Silver (BAg-5)	HVAC/R, copper brazing	N/A	Solidus 1225°F / Liquidus 1370°F, Cd-free	AWS A5.8 / ASTM B260
Sil-Fos 15 Phos-Copper	15% Ag, BCuP-5	Copper-to-copper, self-fluxing	N/A	Solidus 1190°F / Liquidus 1480°F	AWS A5.8 / ASTM B260
Machine Cutting Torch	98-6TAER-32 / 1101445	CNC/mechanized oxy-fuel cutting	N/A	18-inch barrel, 75° head, acetylene rated	—

Compatible Accessories and Related Collections

Harris gas equipment and brazing alloys work as part of a complete system. The following WeldingMart collections carry equipment, consumables, and accessories that work alongside or expand on the Harris products on this page:

Welding Gas Regulators & Pressure Control — The full range of Harris argon, oxygen, acetylene, and mixed gas regulators and flowmeters. Whether you need a single CGA-580 argon regulator for a TIG setup or a full oxy-acetylene regulator pair for a cutting outfit, this collection has every Harris regulator model we stock.
Harris Torch Outfits — Complete Harris oxy-fuel torch outfit packages — handle, cutting attachment, regulators, hose, and tips — for cutting, welding, and heating applications. Includes the Harris 62-5 heavy-duty cutting outfit and lighter-duty maintenance outfits.
Harris Specialty Gas Regulators — Harris HP8700 Series and other high-purity regulators for laboratory, semiconductor, and industrial process gas applications. Stainless steel wetted surfaces, precise two-stage reduction, CGA connections for argon, oxygen, helium, nitrogen, and hydrogen.
TIG Welding Rods & Filler Rods — Harris TIG filler rods including Harris Supermissileweld ER70S-2 steel rod and Harris RG-60 oxy-fuel welding rod, alongside Lincoln Electric TIG filler rods for stainless, aluminum, and specialty alloys.
TIG Welding Supplies — Tungsten electrodes, TIG cups, gas lenses, collets, and back caps for Lincoln Electric and compatible TIG torches. Pairs with Harris argon and argon/helium shielding gas regulators for complete TIG setup.

Frequently Asked Questions — Harris Products Group

Are Harris regulators CGA-certified?: Yes. All Harris gas pressure regulators are designed and tested to comply with CGA E-4 (Standard for Gas Pressure Regulators) and CGA V-1 (Compressed Gas Cylinder Valve Outlet and Inlet Connections). CGA compliance ensures that Harris regulators use the correct inlet fitting for each gas type — CGA-580 for argon, helium, and nitrogen; CGA-540 for oxygen; CGA-510 or CGA-300 for acetylene; CGA-580 for argon/CO₂ mixes. This is a safety standard, not just a quality mark — mismatched regulators and cylinders cannot physically connect in correctly manufactured CGA fittings.
Does Harris make MIG or TIG welding machines?: No. Harris Products Group does not manufacture MIG welders, TIG welders, or stick welding power sources. Harris specializes in gas apparatus (regulators, torches, cutting equipment), brazing and soldering alloys, and flux. For MIG and TIG welding machines, WeldingMart carries Lincoln Electric — Harris's parent company — across the full range of Lincoln Electric MIG, TIG, and multi-process welders. Harris products integrate with Lincoln Electric machines: Harris shielding gas regulators connect to your Lincoln Electric MIG or TIG welder's shielding gas inlet just like any other CGA-580 regulator.
What is the difference between Harris Stay-Silv and Sil-Fos brazing alloys?: Harris Stay-Silv alloys are silver-bearing brazing alloys (15%–56% silver) that require a separate brazing flux and are used for dissimilar metal joints — copper-to-brass, copper-to-steel, copper-to-stainless — as well as copper-to-copper where higher joint strength is needed. Harris Sil-Fos alloys are copper-phosphorus-silver alloys (0%–15% silver) that are self-fluxing on copper-to-copper joints due to the phosphorus content acting as a deoxidizer. Sil-Fos should never be used on iron, steel, or nickel alloys — phosphorus forms brittle phosphides with these metals. Use Sil-Fos only on copper-to-copper; use Stay-Silv (with flux) for all other metal combinations.
What CGA fitting do I need for my gas type?: CGA fittings are gas-specific by design. The standard connections are: CGA-580 for argon, helium, nitrogen, argon/CO₂ mixes, and most inert gases; CGA-540 for oxygen; CGA-510 (POL) for acetylene cylinders; CGA-300 for acetylene manifold connections; CGA-590 for industrial air; CGA-326 for nitrous oxide. Harris regulators are available in the appropriate CGA inlet for each gas family. Never use adapters to mate a regulator to the wrong gas cylinder — this is a serious safety hazard and violates CGA standards.
When was Harris Products Group founded and who owns it?: The Harris legacy begins in 1899 with John Harris's invention of the oxy-acetylene flame-cutting torch. Harris Calorific was formally incorporated in 1905. Lincoln Electric acquired Harris Calorific in 1990 and acquired J.W. Harris Co. in 2005. The two companies were officially merged into The Harris Products Group on May 1, 2006. Harris Products Group is today a wholly owned subsidiary of Lincoln Electric Holdings, Inc. (NASDAQ: LECO), headquartered in Cleveland, Ohio. Harris manufacturing operations span the United States, Europe, and South America. (Manufacturing Today)
What brazing flux should I use with Harris alloys?: Harris offers two primary flux products for brazing. Harris Stay-Silv White Flux is an all-purpose brazing flux for copper, brass, bronze, and mild steel applications — it is suitable for use with Stay-Silv silver alloys and Sil-Fos alloys when brazing copper to materials other than bare copper. Harris Stay-Silv Black Flux is a high-temperature flux formulated for stainless steel brazing, where the chromium oxide layer on stainless resists standard fluxes. Black Flux is also used for extended heating cycles and long-duration heating applications. Always remove flux residue completely after brazing — brazing flux is corrosive and will degrade joints and base metal if left in place.
Are Harris products compatible with Victor torch equipment?: Harris cutting tips, torch handles, and regulators are designed to Harris specifications and are not universally interchangeable with Victor (now Lincoln Electric oxy-fuel brand) torch components without verification of thread type and tip series. Harris one-piece NX tips (6290 Series) are Harris-specific. Harris two-piece tips in the 1700 and 1800 Series are compatible with a broader range of torch bodies including some Victor series. Harris regulators use standard CGA inlet connections, so any Harris regulator with the correct CGA inlet will connect to any compatible cylinder of that gas type regardless of torch brand. Contact WeldingMart's technical support to confirm tip and torch compatibility before ordering.

Harris GAUGE 50MM(2") 3000 PSI 1/4" BOTTOM CONNECTION