Product Description
The Simpson CNW 3/8 in. Coupler Nut with Witness Hole is an engineered fastener from Simpson Strong-Tie built to connect threaded rods to one another and to anchor bolts with confidence. Designed to exceed the specified minimum tensile capacity of the corresponding bolts and threaded rod, this coupler nut delivers reliable, verifiable connections for structural and anchoring applications requiring a 3/8 in. rod diameter. Available in zinc plated or uncoated finish, it is intended for use with non-hot-dip galvanized all-thread rod.
Key Features
- Witness hole for visual installation verification - tighten the two rods until each all-thread rod is visible in the Witness hole, giving installers a clear, on-the-spot confirmation that rods are properly seated before the work is complete.
- Positive stop feature - helps ensure even and proper thread engagement into each end of the nut, reducing the risk of uneven threading and supporting consistent, dependable connections across every installation.
- Exceeds specified minimum tensile capacity - engineered to surpass the tensile requirements of the corresponding bolts and threaded rod, so the coupler nut is never the weak point in the connection.
- For non-hot-dip galvanized all-thread rod only - confirms correct material pairing upfront, helping users select the right fastener and avoid compatibility issues in the field.
Why This Product
- Built-in verification means fewer costly mistakes - the Witness hole provides a simple, no-guesswork method to confirm correct rod installation, reducing the chance of under-threaded connections that could compromise structural integrity.
- Engineered to outperform the rod and bolt it connects - because the CNW coupler nut is designed to exceed the minimum tensile capacity of the corresponding threaded rod and anchor bolt, the joint connection remains the strongest point in the assembly.
- Positive stop for consistent, repeatable results - whether used for rod-to-rod extensions or rod-to-anchor-bolt connections, the positive stop feature promotes uniform thread engagement on both ends, supporting predictable performance across multiple installations.
- Trusted Simpson Strong-Tie engineering in a compact fastener - backed by a brand recognized for structural fastener design, this coupler nut brings purpose-built reliability to threaded rod connections where performance and installation accuracy both matter.
Specifications
- MPN: CNW3/8
- Brand: Simpson Strong-Tie
- Bolt/Rod Diameter: 3/8 in.
- Height (min.): 1 in.
- Coating: Zinc Plated or Uncoated
- Finish: Zinc Plated or Uncoated
Options
- Available in standard strength and high strength depending on corresponding rod in use
- Couplers available with oversized threads on one end for installation on hot-dip galvanized bolts (See 1/2OST models for ordering)
- OST couplers are typically oversized on one end of the coupler nut only and will be marked with an "O" on oversized side
Frequently Asked Questions
- How do I know when the rods are properly installed in the CNW3/8 coupler nut?
- The CNW3/8 features a Witness hole that allows you to visually confirm correct installation. Tighten the two rods until each all-thread rod is visible through the Witness hole, which serves as a means to verify when rods are properly installed.
- What is the purpose of the positive stop feature on the CNW3/8?
- The positive stop feature helps ensure even and proper thread engagement into each end of the nut, providing consistent and reliable rod-to-rod or rod-to-anchor-bolt connections.
- Can the CNW3/8 coupler nut be used with hot-dip galvanized all-thread rod?
- No. The CNW3/8 is for non-hot-dip galvanized all-thread rod only. For use with hot-dip galvanized bolts, see the OST coupler nut models, which feature oversized threads on one end.
- What rod diameter is the CNW3/8 designed for?
- The CNW3/8 is designed for a rod diameter of 3/8 in. and has a minimum height of 1 in. It is engineered to exceed the specified minimum tensile capacity of the corresponding bolts and threaded rod.
Note: Product dimensions and/or Screw or Bolt holes may differ from picture. Please see item description for specifications.
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