A/C Hose Crimper Parts
A/C Hose Crimper Replacement Parts & Accessories
Genuine Mastercool replacement parts and accessories for Hydra-Krimp A/C hose crimping tools. Maintain professional-grade crimping performance with quality replacement dies, rubber strips, yokes, hydraulic pumps, and die holders for automotive and HVAC A/C hose assembly work.
Essential Crimper Parts
Crimping Dies
Precision dies for professional A/C hose crimping:
- #6 hose dies: For 5/16" (8mm) A/C hoses
- #8 hose dies: For 13/32" (10mm) A/C hoses
- #10 hose dies: For 1/2" (13mm) A/C hoses
- #12 hose dies: For 5/8" (16mm) A/C hoses
- Standard and reduced-barrier: Dies for both hose types
- Complete die sets: Full range for all common hose sizes
Rubber Strips
Essential components for proper crimping:
- Standard hose rubber strips: For conventional A/C hoses
- Reduced-barrier rubber strips: For modern barrier hoses
- Multiple sizes: Strips for #6, #8, #10, and #12 hoses
- Quality materials: Ensures proper crimp compression
- Consumable item: Replace regularly for consistent crimps
Yoke Assemblies & Hinge Pins
Structural components for crimper operation:
- Complete yoke assemblies
- Replacement hinge pins
- Mounting hardware
- Maintains crimper alignment and function
- Essential for proper die operation
Hydraulic Pump Assemblies
Power components for crimping force:
- Complete hydraulic pump assemblies
- Replacement pump components
- Seals and O-rings
- Maintains consistent crimping pressure
- Professional-grade performance
Die Holders & Arbor Assemblies
Mounting and positioning components:
- Die holder assemblies
- Arbor components
- Mounting hardware
- Ensures proper die alignment
- Critical for leak-free crimps
Why Use Genuine Mastercool Parts?
- Perfect fit: Designed specifically for Mastercool 71500 and 71550 series crimpers
- Quality crimps: Genuine dies ensure proper crimp dimensions and leak-free connections
- Consistent performance: Reliable crimping results every time
- Warranty protection: Using genuine parts maintains equipment warranty
- Technical support: Full UK support for installation and compatibility
- Proven reliability: Tested and verified for professional A/C hose assembly
Compatible Crimper Models
These parts are designed for Mastercool crimper models:
- Mastercool 71500 series: Standard Hydra-Krimp crimpers
- Mastercool 71550 series: Professional Hydra-Krimp crimpers
- Other compatible models: Check compatibility for specific parts
Not sure which parts you need? Check your crimper model number and contact our technical team for compatibility confirmation.
Crimper Maintenance
Regular Maintenance Schedule
Keep your crimper performing optimally:
- After each use: Clean dies and remove debris, wipe down crimper
- Weekly (heavy use): Inspect dies for wear, check hydraulic operation, lubricate moving parts
- Monthly: Thorough inspection of all components, replace worn rubber strips
- Annually: Complete service, replace worn dies, check hydraulic seals
Die Replacement
Replace crimping dies when:
- Visible wear or damage to die surfaces
- Crimps fail pressure testing
- Inconsistent crimp dimensions
- Leaks develop in crimped hoses
- Dies show scoring or pitting
Rubber Strip Replacement
Replace rubber strips:
- After approximately 50-100 crimps (depending on use)
- When strips show compression or damage
- If crimps appear inconsistent
- Before critical hose assembly work
A/C Hose Crimping Guide
Proper Crimping Procedure
- Select correct die: Match die size to hose size (#6, #8, #10, or #12)
- Install rubber strip: Place fresh rubber strip in die
- Position hose: Insert assembled hose and fitting into die
- Align properly: Ensure hose is centred and straight
- Pump hydraulic handle: Apply pressure gradually and evenly
- Complete crimp: Pump until dies close completely
- Release pressure: Open dies and remove crimped hose
- Inspect crimp: Check for proper compression and alignment
- Pressure test: Test crimped hose before installation
Crimp Quality Checks
A proper crimp should have:
- Uniform compression: Even crimp around entire circumference
- Correct dimensions: Crimp diameter matches specification
- No gaps: Complete seal between hose and fitting
- Straight alignment: Hose and fitting properly aligned
- No damage: No cuts, tears, or damage to hose
Pressure Testing
Always pressure test crimped hoses:
- Connect hose to nitrogen regulator
- Pressurize to working pressure (typically 300-400 PSI)
- Check for leaks with leak detector or soapy water
- Hold pressure for 5 minutes
- Verify no pressure drop
- Release pressure before use
Common Crimping Problems & Solutions
Problem: Leaking Crimps
Possible causes:
- Worn or damaged dies
- Old or compressed rubber strips
- Incorrect die size for hose
- Incomplete crimp (insufficient pressure)
- Misaligned hose or fitting
Solutions:
- Replace worn dies
- Use fresh rubber strips
- Verify correct die size
- Ensure complete crimp cycle
- Check alignment before crimping
Problem: Inconsistent Crimp Dimensions
Possible causes:
- Worn rubber strips
- Damaged dies
- Hydraulic pressure issues
- Misalignment
Solutions:
- Replace rubber strips regularly
- Inspect and replace damaged dies
- Service hydraulic pump
- Check die holder alignment
Problem: Hose Damage During Crimping
Possible causes:
- Excessive pressure
- Damaged dies
- Incorrect die size
- Poor hose quality
Solutions:
- Don't over-crimp (stop when dies close)
- Replace damaged dies
- Use correct die for hose size
- Use quality A/C hoses
Hose Size & Die Selection Guide
| Hose Size | Die Size | Typical Application |
|---|---|---|
| 5/16" (8mm) | #6 | Low-pressure automotive A/C lines |
| 13/32" (10mm) | #8 | Standard automotive A/C lines |
| 1/2" (13mm) | #10 | High-pressure automotive A/C lines |
| 5/8" (16mm) | #12 | Large automotive and HVAC A/C lines |
Standard vs Reduced-Barrier Hoses
Standard Barrier Hoses
- Traditional A/C hose construction
- Standard rubber strips required
- Common in older vehicles
- Lower cost
Reduced-Barrier Hoses
- Modern low-permeation construction
- Requires reduced-barrier rubber strips
- Mandatory for R1234yf systems
- Meets environmental regulations
- Thinner wall construction
Important: Always use the correct rubber strips for your hose type. Using standard strips on reduced-barrier hoses (or vice versa) will result in improper crimps and leaks.
Frequently Asked Questions
How often should I replace crimping dies?
Dies should be replaced when they show visible wear, produce inconsistent crimps, or crimped hoses fail pressure testing. With proper care, dies can last for thousands of crimps, but inspect regularly and replace at first sign of wear.
Can I use third-party dies on my Mastercool crimper?
We strongly recommend using genuine Mastercool dies. Third-party dies may not meet dimensional tolerances, resulting in leaking crimps and potential safety issues. Genuine dies ensure proper crimp dimensions and leak-free connections.
What's the difference between standard and reduced-barrier rubber strips?
Reduced-barrier rubber strips are designed for modern low-permeation A/C hoses with thinner walls. Standard strips are for traditional A/C hoses. Using the wrong type will result in improper crimp compression and leaks.
How do I know if my crimp is good?
A good crimp has uniform compression around the entire circumference, correct dimensions per specification, no gaps between hose and fitting, and passes pressure testing without leaks. Always pressure test crimped hoses before installation.
Why do my crimps keep leaking?
Common causes include worn dies, old rubber strips, incorrect die size, incomplete crimping, or misalignment. Replace worn components, use fresh rubber strips, verify correct die size, and ensure complete crimp cycle.
Related Products
- A/C Hose Crimping Tools - Complete crimper range
- Manifolds & Gauges - For A/C diagnostics
- R134a Tools - Automotive A/C equipment
Need help identifying the right parts for your crimper? Contact our technical team with your crimper model number for expert advice.
Genuine Mastercool A/C hose crimper parts. Official UK distributor stock with full technical support.
