Mastercool 70052 — Sliding Die-Block 45° Flaring Tool (3/16" to 5/8") Flares & Burnishes

Unique Sliding Die-Block Design: Flares and Burnishes in One Easy Operation

The Mastercool 70052 sliding die-block 45-degree flaring tool features a uniquely designed flaring cone that flares and burnishes in one easy operation. The slide-on yoke is simple to use, whilst the hardened multi-size flaring bar speeds flaring time. This innovative design creates smooth, professional flares on six imperial tubing sizes from 3/16" to 5/8" O.D.

Flares and Burnishes in One Operation

The uniquely designed flaring cone performs two operations simultaneously — it flares the tubing to the correct 45-degree angle whilst burnishing the surface to a smooth, polished finish. Traditional flaring tools only flare; the 70052 flares AND burnishes, creating smoother, more professional flares that seal better and look better.

Why This Matters: Burnishing smooths the flare surface, removing tool marks and creating a better sealing surface. This results in more reliable, leak-free connections and a professional finish that reflects quality workmanship.

Slide-On Yoke: Simple and Fast

The slide-on yoke design is simple to use and speeds up flaring operations. Just position the tubing in the flaring bar, slide the yoke over, and turn the handle. No complicated setup, no fumbling with alignment — the sliding die-block design makes flaring straightforward and efficient.

Hardened Multi-Size Flaring Bar

The hardened multi-size flaring bar holds six common tubing sizes in one compact tool. The hardened construction maintains dimensional accuracy even after thousands of flares, whilst the multi-size design means you only need one tool instead of six separate flaring tools.

Six Imperial Sizes in One Tool

Flares and burnishes six common imperial refrigeration tubing sizes:

• 3/16" O.D. — Small refrigeration lines
• 1/4" O.D. — Standard suction and liquid lines
• 5/16" O.D. — R410A and larger systems
• 3/8" O.D. — Common suction lines
• 1/2" O.D. — Commercial suction lines
• 5/8" O.D. — Large commercial systems

Key Features

• Flares and Burnishes — Unique cone design performs both operations simultaneously
• Slide-On Yoke — Simple, fast operation
• Hardened Flaring Bar — Multi-size, maintains accuracy
• 45-Degree Flare — SAE standard angle
• Six Sizes — 3/16" to 5/8" O.D. imperial tubing
• Professional Quality — Smooth, polished flares
• Compact Design — One tool for six sizes

Technical Specifications

• Model: 70052
• Flare Angle: 45 degrees (SAE standard)
• Tubing Sizes: 3/16", 1/4", 5/16", 3/8", 1/2", 5/8" O.D.
• Yoke: Slide-on design
• Cone: Unique flaring and burnishing design
• Flaring Bar: Hardened, multi-size
• Tubing Type: Imperial (inch sizes)
• Operation: Flares and burnishes in one operation

Perfect For

• HVAC technicians requiring smooth, professional flares
• Automotive A/C line fabrication and repair
• Commercial refrigeration installations
• Residential air conditioning service
• Workshop and field flaring operations
• Any application requiring high-quality 45-degree SAE flares

Why Burnishing Matters

Burnishing is the process of smoothing and polishing the flare surface. The benefits include:

• Better Sealing — Smooth surface creates better metal-to-metal contact
• Fewer Leaks — Polished surface eliminates micro-imperfections
• Professional Appearance — Smooth, shiny flares look professional
• Easier Assembly — Smooth flares slide into fittings more easily
• Longer Life — Polished surface resists corrosion better

How to Create Perfect Flares with the 70052

1. Cut Tubing Square — Use a proper tubing cutter for a clean, square cut
2. Deburr Inside and Outside — Remove all burrs and sharp edges
3. Slide Flare Nut On — Don't forget this step before flaring!
4. Position in Flaring Bar — Insert tubing to correct depth for size
5. Slide Yoke Over Bar — Simple slide-on operation
6. Turn Handle — Cone flares and burnishes simultaneously
7. Back Off Cone — Reverse handle to retract cone
8. Remove and Inspect — Check for smooth, burnished flare with no cracks

Signs of a Perfect Flare

• Smooth, Burnished Surface — Polished finish, no tool marks
• No Cracks or Splits — Clean, even flare
• Even Thickness — Consistent wall thickness around entire flare
• Correct Angle — 45-degree cone shape
• Proper Diameter — Matches fitting requirements
• No Distortion — Tubing remains round below flare

70052 vs 70051: Which Flaring Tool?

Choose 70052 (Sliding Die-Block) When:

• You want flares that are burnished for a smooth finish
• You prefer slide-on yoke operation
• You need six sizes (3/16" to 5/8")
• You want the smoothest possible flares

Choose 70051 (Standard) When:

• You need seven sizes including 7/16"
• You prefer auto-centering yoke with bearing-driven cone
• You want forged steel slip-on yoke
• Standard flaring (without burnishing) is sufficient

Common Flaring Mistakes to Avoid

• Forgetting Flare Nut — Always slide nut on before flaring
• Not Deburring — Burrs cause leaks and weak flares
• Wrong Tubing Depth — Too high or too low creates poor flares
• Over-Flaring — Excessive pressure thins walls and causes cracks
• Dirty Tubing — Clean tubing ensures proper seal

Why Choose the Mastercool 70052?

• Unique Design — Flares and burnishes in one operation
• Professional Results — Smooth, polished flares every time
• Easy to Use — Slide-on yoke, simple operation
• Six Sizes — Covers most common imperial refrigeration tubing
• Hardened Construction — Maintains accuracy over time
• Better Sealing — Burnished flares seal more reliably

The Professional Flaring Tool with Burnishing

The Mastercool 70052 sliding die-block 45-degree flaring tool is the choice for professionals who want the smoothest, most professional flares possible. The unique cone design that flares and burnishes in one operation creates polished, leak-free flares that seal reliably and look professional. With the slide-on yoke, hardened multi-size bar, and six common tubing sizes, this is the flaring tool for quality-focused HVAC work.

Flares and burnishes in one operation. Slide-on yoke. Hardened multi-size bar. Professional smooth flares on six imperial sizes.