



Miller | Smith HD Single Stage Series 40 Oxygen Regulator (40-XX-540)
Lead time: 1-2 Weeks
Select Size (Parts & Accessories):
Select Size (Parts & Accessories)
Quantity:

The Miller Smith heavy-duty series 40 regulators offer industrial grade quality, providing accurate pressure readings for welding, cutting, heating, and other applications. These regulators come with a 3-year warranty and provide consistent gas flow due to the durable construction.
Optional Hard Hat Regulator Guards are sold separately (HB190).
Features
• Resin Bonnet Insert (series 40/46 only) - allows smooth, easy adjustment even at high-pressure levels
• Stainless Steel Diaphragm - resists corrosion, leaking and freeze-up if used with liquid gases
• Color-Coded Labels - supplies performance capabilities, easy gas service, and identification
• External Relief Valve - protects regulator from damage due to inadvertent high-pressure surge
• Nickel-Plated Bonnet - along with brass body, these protect against corrosion
• Gauges and Lenses - 2.5 inch corrosion-resistant polished brass gauges with shatter-resistant lenses
• Sure Seat Dual-Filtered Seat Assembly - protects high-pressure seat from debris for reliable operation
Quick Specs
• Max Delivery Pressure: 175 or 275 PSI
• Max Inlet Pressure: 3,000 PSI (207 Bar)
• Outlet Connection: 9/16"-18 RH
• CGA: 540
Optional Hard Hat Regulator Guards are sold separately (HB190).
Features
• Resin Bonnet Insert (series 40/46 only) - allows smooth, easy adjustment even at high-pressure levels
• Stainless Steel Diaphragm - resists corrosion, leaking and freeze-up if used with liquid gases
• Color-Coded Labels - supplies performance capabilities, easy gas service, and identification
• External Relief Valve - protects regulator from damage due to inadvertent high-pressure surge
• Nickel-Plated Bonnet - along with brass body, these protect against corrosion
• Gauges and Lenses - 2.5 inch corrosion-resistant polished brass gauges with shatter-resistant lenses
• Sure Seat Dual-Filtered Seat Assembly - protects high-pressure seat from debris for reliable operation
Quick Specs
• Max Delivery Pressure: 175 or 275 PSI
• Max Inlet Pressure: 3,000 PSI (207 Bar)
• Outlet Connection: 9/16"-18 RH
• CGA: 540
From The Blog

Engine-Driven Welders
The Bobcat 265: The Next Generation of Welder/Generators
If the old Bobcat series was the best thing since sliced bread, then the next-generation Bobcat 265 is the best thing since happy hour. Miller’s Bobcat series has always been a legend—and now that ...

Projects
Fence Welding Ideas You Have To See
When it comes to welding a project yourself versus simply buying it pre-made, it’s often surprisingly cheaper to buy rather than DIY (check out our post on the topic here). However, fences and gate...

Engine-Driven Welders
Portable Power: Discover the Bobcat 230
All dressed up with nowhere to go. That’s a phrase you usually don’t hear in the welding world, despite how often it applies. You see, you might be decked out in top-of-the-line gear, with the skil...