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Internet #205299193

Model #CNW5/8

CNW 5/8 in. Coupler Nut with Witness Hole

  • Easily connect threaded rod and anchor bolts
  • Witness hole for greater visibility
  • Designed for even threading
  • See More Details

Frequently Bought Together


Product Overview

Simpson Strong-Tie coupler nuts are a tested and load-rated method to join threaded rod and anchor bolts. "Witness" holes in the nut provide a means to verify when rods are properly installed. The positive stop feature helps ensure even threading into each end of the nut.
  • Tighten the 2 rods until each all-thread rod is visible in the witness hole
  • For non-hot-dip galvanized all-thread rod only
  • Rod diameter: 0.625 in.
  • Height: 1-7/8 in.
  • Zinc plated
  • Shop all Simpson Strong-Tie here.

Info & Guides

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Fastener Type
Hex Nut
Product Weight (lb.)

Warranty / Certifications

Manufacturer Warranty
Limited Warranty

Questions & Answers


Is this galvanized or corrosion proof at all?

Asked by Vic December 6, 2020

Hello! All of the CNW coupler nuts have electroplated zinc finish which does not provide required corrosion protection for exterior applications. You would need to source a coupler nut that was hot-dip galvanized and then over-tapped for fitting onto hot-dip galvanized threaded rod.

how many threads per inch are inside this Witness Coupler Nut

Asked by CouplerMAN December 2, 2017

The CNW5/8 has 11 threads per inch. Thank you!

What is the correct dimension (length)?

Asked by Adelpated July 31, 2016

The coupler nut is 3.5" high.

Customer Reviews

  • 5
    out of 4 reviews
  • 100% recommend this product
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Rating provided by a verified purchaser...
Rating provided by a verified purchaser
by HomeDepotCustomer
No equal says it all for Simpson products, and Home...
No equal says it all for Simpson products, and Home Depot stocks a lot of it
by Tom
I had originally shopped Amazon for this item and found...
I had originally shopped Amazon for this item and found it significantly cheaper and just as convienent when I ordered it through HD. In the future it would be nice to see HD expand this service by teaming up with a company like McMaster Carr and offering an expanded selection not typically in the
by WilliamOBX
1 person found this helpful
good purchase
quick response and delivery. good part. yes, I would recommend this purchase
by patrick
Showing 1-4 of 4 reviews