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.