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1/2" Terminal Nut 000645 - Bubbles Supply

1/2" Terminal Nut 000645

Part #: 000645

$0.54
In stock — ships today
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this cord/connector

This 1/2" stainless steel terminal nut is an essential heater component designed for Allied Innovations spa heating systems. The OEM replacement part ensures secure electrical connections in your spa's heating element assembly, maintaining proper conductivity and preventing loose connections that can cause heating failures.

Engineered from corrosion-resistant stainless steel, this terminal nut delivers the durability needed for wet spa environments. At Bubbles Supply, we guarantee an exact fit for your Allied Innovations heater with our authentic OEM parts, backed by our 1-year warranty and same-day shipping on in-stock items. Professional installation is recommended to ensure proper torque specifications and electrical safety compliance.

Exact part number

000645

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Also known as / Replaces

This part replaces or is interchangeable with:

  • 1/2 inch terminal nut
  • heater terminal nut
  • heating element nut
  • stainless terminal nut

Looking for an older part number? Check our supersession lookup tool

Common symptoms this part fixes

If your spa is showing any of these signs, this part is likely your fix:

  • Loose or arcing connection at heater terminal
  • Heater not reaching set temperature
  • Intermittent heating or heater cycling off unexpectedly
  • Visible corrosion or damage at heating element stud
  • Spa tripping GFCI breaker due to poor terminal connection

Not sure if this is your problem? Try our diagnostic centre or .

Before you buy — quick checklist

  • Confirm your heater is an Allied Innovations unit — check the label on the heater housing
  • Verify the terminal stud on your heating element is 1/2 inch thread before ordering
  • Inspect the existing nut for thread damage — if the stud is also damaged, you may need additional parts
  • Shut off all power to the spa at the breaker before attempting any heater terminal work
  • Have a torque wrench or calibrated tool available — overtightening stainless nuts on heater studs can crack the element

Reading the checklist now prevents 90% of returns. Worth the 60 seconds.

Install difficulty: Medium — Some experience neededTypically 15-30 minutes

Warranty

1 year manufacturer warranty against defects

Covers manufacturing defects. Does not cover improper installation, normal wear, or accidental damage.

Warranty claims: warranty@bubblessupply.com

Perfect Fit Guarantee

Ordered with our help and the part doesn't fit? Contact us before installation. We'll resolve it with an exchange, replacement recommendation, or return approval.

Learn about our Perfect Fit Guarantee →

Shipping

We ship across the US and Canada. US orders ship from our US warehouse to US customers; Canadian orders ship from our Canadian warehouse to Canadian customers — no cross-border shipping, no surprise duties. In-stock orders placed before 3pm CT ship same day. Standard shipping $9.95 flat rate. Free shipping on orders over $200. Express options available at checkout.

Returns

30-day hassle-free returns on unused parts in original packaging. Contact us before returning to receive your RMA number.

Frequently asked questions

Check the Compatibility section above to confirm fitment for your spa brand and model. If your model is not listed, use our fitment selector at /pages/find-my-part or ask our parts AI for a personalized recommendation.

In-stock orders placed before 3pm CT ship the same day. You will receive tracking information by email as soon as your order ships.

We accept returns within 30 days of delivery for unused items in original packaging. Email returns@bubblessupply.com with your order number to start a return. Installed electrical parts cannot be returned for safety reasons.

Yes, all new parts come with a 1-year warranty against manufacturing defects. Warranty does not cover damage from improper installation or normal wear and tear.

Customer reviews

AI Fitment Assistant

Tell us your spa model and we will confirm this part fits before you buy.

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