Mastercool 70073 — Spring-Style Tube Bender 3/8" O.D. (10" Length) for Soft Copper & Aluminium

Economical Spring-Style Tube Bender: Kink-Free Bending for 3/8" Tubing

The Mastercool 70073 spring-style tube bender is an economical and effective tool for bending 3/8" O.D. soft copper or aluminium tubing without kinks. Made from special nickel-plated spring steel and flared on one end for quick tube insertion, this simple yet effective tool delivers professional kink-free bends at a fraction of the cost of mechanical benders.

Spring Steel Design: Simple, Effective, Kink-Free

The spring steel construction provides external support during bending, preventing the tubing from collapsing or kinking. As you bend the tubing, the spring distributes the bending force evenly around the tube's circumference, maintaining a smooth, round cross-section throughout the bend. This simple mechanical principle delivers professional results without complex mechanisms.

Why This Matters: Kinked tubing restricts flow and creates weak points that can fail. The spring bender's external support prevents kinking, ensuring smooth bends that maintain full flow capacity and structural integrity.

Nickel-Plated for Durability and Smooth Operation

The nickel-plated finish provides corrosion resistance and a smooth surface that slides easily over tubing. The plating protects the spring steel from rust and oxidation, ensuring long service life even in damp workshop environments.

Flared End for Quick Tube Insertion

The flared end makes tube insertion quick and easy. Simply slide the tubing into the flared opening — no struggling to thread tubing through a tight spring. This design feature saves time on every bend and makes the tool easier to use, especially when working with longer tubing sections.

Key Features

• Spring Steel Construction — Prevents kinking during bending
• Nickel-Plated Finish — Corrosion-resistant, smooth operation
• Flared End — Quick, easy tube insertion
• 3/8" O.D. Size — For 3/8" soft copper or aluminium tubing
• 10" Length — Adequate coverage for most bends
• Economical — Cost-effective alternative to mechanical benders
• Lightweight — Easy to carry and use
• No Moving Parts — Simple, reliable design

Technical Specifications

• Model: 70073
• Tube Size: 3/8" O.D.
• Length: 10" (254mm)
• Material: Spring steel, nickel-plated
• End Design: Flared for easy insertion
• Tubing Type: Soft copper, aluminium, and similar materials
• Operation: Manual, hand-operated

Complete Spring Bender Range

The 70073 is part of Mastercool's complete spring-style tube bender range:

• 70071: 1/4" O.D., 10" length
• 70072: 5/16" O.D., 10" length
• 70073: 3/8" O.D., 10" length (this model)
• 70074: 1/2" O.D., 12" length
• 70075: 5/8" O.D., 14" length
• 70077: 3/4" O.D., 14" length

Note: Each spring bender is sized for one specific tube diameter. Choose the model that matches your tubing O.D.

Perfect For

• HVAC technicians bending refrigeration suction lines
• Plumbers working with 3/8" soft copper tubing
• Automotive applications requiring tube bends
• Hobbyists and DIY projects
• Mobile service operations requiring lightweight tools
• Budget-conscious professionals needing economical bending solutions

How to Use Spring-Style Tube Benders

1. Select Correct Size — Use 70073 for 3/8" O.D. tubing only
2. Insert Tubing — Slide tubing through the flared end of the spring
3. Position Spring — Centre the spring over the intended bend location
4. Bend Tubing — Slowly bend the tubing to the desired angle. The spring prevents kinking
5. Remove Spring — Slide the spring off the tubing after completing the bend
6. Inspect Bend — Check for smooth, kink-free bend

Tips for Perfect Spring Bends

• Use Soft (Annealed) Tubing — Hard-drawn tubing is difficult to bend and may crack
• Centre the Spring — Position spring over the bend point for best support
• Bend Gradually — Slow, steady bending prevents kinks
• Don't Over-Bend — Bend to the desired angle, then stop
• Support Long Sections — Support tubing to prevent twisting
• Clean Tubing First — Remove dirt and oil for smooth spring operation

Spring Benders vs Mechanical Benders

Spring Benders (70073):

• Economical — Low cost
• Lightweight and portable
• Simple to use — No setup required
• No moving parts to wear out
• Ideal for occasional use
• Best for smaller diameter tubing

Mechanical Benders (70070, etc.):

• More expensive
• Heavier, more complex
• Require setup and adjustment
• More precise bend control
• Better for frequent use
• Handle larger diameter tubing better

When to Choose Spring Benders

• Budget-Conscious — Economical alternative to mechanical benders
• Occasional Use — Don't need expensive tools for infrequent bending
• Small to Medium Diameter Tubing — Spring benders work well on 1/4" to 3/4" tubing
• Simple Bends — No need for precise angle control
• Portable Work — Lightweight, easy to carry
• Quick Jobs — No setup time required

Common Mistakes to Avoid

• Wrong Size Spring — Always match spring size to tubing O.D.
• Bending Hard-Drawn Tubing — Use annealed (soft) tubing only
• Spring Not Centred — Position spring over bend point for best support
• Bending Too Fast — Gradual bending prevents kinks
• Forcing the Bend — If tubing resists, it may be too hard

Why Choose the Mastercool 70073?

• Economical — Cost-effective kink-free bending
• Effective — Simple design that works
• Nickel-Plated — Corrosion-resistant, long-lasting
• Flared End — Easy tube insertion
• Lightweight — Portable and easy to use
• No Maintenance — No moving parts to wear out
• Professional Results — Kink-free bends every time

The Economical Solution for Kink-Free Bending

The Mastercool 70073 spring-style tube bender is the economical solution for kink-free bending of 3/8" O.D. soft copper or aluminium tubing. With its nickel-plated spring steel construction, flared end for easy insertion, and simple yet effective design, this tool delivers professional results without the cost and complexity of mechanical benders. Perfect for occasional use, mobile work, or budget-conscious professionals — this is the simple tool that just works.

Economical. Effective. Kink-free bending for 3/8" tubing. Nickel-plated spring steel with flared end.