The Simpson MSSC4.25KW-KT20 Kneewall Connector from Simpson is a rigid cold-formed steel (CFS) connector engineered for moment-resisting kneewall lighter-duty applications in steel framing. Designed to work in tandem with the BP 1/2-3 bearing plate, this 4-1/4 in. connector pairs a 12 ga. MSSC clip with a heavy-duty bearing plate to deliver the increased load capacity required for load-bearing wall support in CFS curtain-wall and kneewall construction. Each package includes 20 connectors and 20 bearing plates, providing a complete, ready-to-install solution for steel framing crews.

Key Features

• One simple custom hole pattern per stud size - streamlines specification and installation, reducing layout time and the chance of field errors.
• 3/8 in. diameter anchor bolt location - positioned for easy tool access, so installers can drive fasteners efficiently without awkward repositioning.
• BP 1/2-3 bearing plates included - eliminates the need to source plates separately, ensuring a matched, engineered connection right out of the box.
• MSSC made from 97 mil (12 ga.) steel (50 ksi) - provides the structural strength cold-formed steel applications demand, while the 229 mil (3 ga.) bearing plate adds a thick, rigid base for load transfer.
• 4-1/4 in. kneewall connector sized for 6 in. deep steel framing members - ensures a precise, code-consistent fit without field modification or shimming.
• Zinc galvanized (G90) finish on the MSSC connector - offers corrosion resistance suited to demanding construction environments, extending service life.

Why This Product

• A complete kneewall connection kit in one package - with both the MSSC connectors and BP 1/2-3 bearing plates included, installers have every component needed for a moment-resisting kneewall connection without separate procurement.
• Engineered specifically for cold-formed steel framing - the MSSC series is purpose-built for CFS curtain-wall and kneewall applications, providing the load capacity and dimensional compatibility that wood-framing hardware cannot offer in steel construction.
• Simplified installation through thoughtful design - the stud-size-specific hole pattern and accessible 3/8 in. anchor bolt location reduce installation complexity, helping crews work faster with fewer callbacks.
• Trusted Simpson quality with domestic manufacturing - produced in the United States with a G90 zinc galvanized finish, these connectors meet the performance and corrosion-resistance expectations of commercial and light-gauge steel framing professionals.

Specifications

• MPN: MSSC4.25KW-KT20
• Brand: Simpson Strong-Tie
• Connector Length: 4-1/4 in.
• Gauge: 12 ga. (97 mil)
• Member Size: 6 in. depth
• Coating/Finish: Zinc Galvanized, G90 (MSSC); Uncoated steel (BP)
• Anchor Bolt Diameter: 3/8 in.
• MSSC Steel Strength: 50 ksi
• BP Steel Thickness: 229 mil (3 ga.), 33 ksi
• Packaging Quantity: 20
• Install With: Fasteners may vary by application; refer to Simpson Strong-Tie catalog or strongtie.com
• Country of Origin: United States

Approved Applications

• Curtain-Wall Construction

What's Included

• (20) MSSC4.25KW connectors
• (20) BP bearing plates

Frequently Asked Questions

What size framing member is the MSSC4.25KW-KT20 compatible with?

The MSSC4.25KW-KT20 is a 4-1/4 in. kneewall connector compatible with a 6 in. deep steel framing member, making it well-suited for cold-formed steel (CFS) curtain-wall and kneewall construction applications.

Are bearing plates included with this connector kit?

Yes. Each package includes 20 MSSC kneewall connectors and 20 BP 1/2-3 bearing plates. The bearing plates are made from 229 mil (3 ga.) steel (33 ksi) with an uncoated steel finish, while the connectors feature a zinc galvanized (G90) finish.

What gauge and material are the MSSC connectors made from?

The MSSC connectors are made from 97 mil (12 ga.) steel with a minimum yield strength of 50 ksi, providing the increased load capacity required for cold-formed steel construction applications.

What fasteners are required to install the MSSC4.25KW-KT20?

Fasteners may vary by application. For specific fastener requirements, refer to the Simpson Strong-Tie catalog or strongtie.com to ensure proper installation for your project conditions.

Note: Product dimensions and/or screw or bolt holes may differ from picture. Please see item description for specifications.