Step-by-step calibration and go/no-go gauge inspection procedures to ensure leak-free PEX crimp connections every time.
Critical for Code Compliance: Improperly crimped PEX connections can fail inspection and leak
Water Damage Prevention: Under-crimped rings can leak; over-crimped can damage pipe
Tool Wear: Crimp tools wear over time and need regular calibration checking
Liability: Failed connections can cause significant water damage
| PEX Size | Go Gauge (Min-Max) | No-Go Gauge | Result |
|---|---|---|---|
| 1/2" | 0.520" - 0.540" | ≤ 0.516" | Go fits, No-Go doesn't = PASS |
| 5/8" | 0.645" - 0.665" | ≤ 0.641" | Go fits, No-Go doesn't = PASS |
| 3/4" | 0.765" - 0.785" | ≤ 0.761" | Go fits, No-Go doesn't = PASS |
| 1" | 1.010" - 1.030" | ≤ 1.006" | Go fits, No-Go doesn't = PASS |
✓ PASS: "Go" gauge fits over crimped ring, "No-Go" does NOT fit
✗ FAIL: Either Go doesn't fit (over-crimped) OR No-Go fits (under-crimped)
Check calibration:
New tools: Even brand new tools should be tested before first use
Rental tools: ALWAYS test before using - unknown maintenance history
If Tool Over-Crimps (Go gauge doesn't fit):
If Tool Under-Crimps (No-Go gauge fits):
Tool-Specific Instructions:
Good Crimp Should Show:
Bad Crimp Indicators:
Under-Crimped (leaks immediately or later):
Over-Crimped (immediate failure or stress cracks):
Misaligned Crimp:
Copper Crimp Rings (Most Common)
Stainless Steel Cinch Clamps
PEX-A Expansion System
Most plumbing codes require:
Inspection Process:
Keep gauge with tool for inspection day!
Buy complete kit: Tool + Go/No-Go gauge for all sizes you'll use
Tool quality matters:
Gauge availability:
This comprehensive PEX crimp tool calibration and inspection guide helps plumbers and DIYers verify their crimp connections meet industry standards for leak-free performance. Proper crimp ring compression is critical for preventing leaks - both under-crimped and over-crimped connections can fail, causing water damage and costly repairs.
Go/No-Go gauges provide a simple, reliable method to verify crimp quality. This guide covers the correct gauge dimensions for each PEX pipe size, visual inspection criteria, troubleshooting common crimp problems, and best practices for tool maintenance and calibration. Regular testing ensures consistent, code-compliant connections throughout your plumbing system.
Whether you're a professional plumber or a homeowner tackling a PEX installation, understanding crimp calibration helps you work confidently and avoid failed inspections or future leaks.
Properly calibrated crimp tools and verified connections prevent leaks and ensure your plumbing work passes inspection. This guide helps you maintain quality standards.