Fein OTA 1-3/4" E-Cut Universal Bi-Metal Blade

The Fein OTA 1-3/4” E-Cut Universal Bi-Metal Blade is a professional-grade oscillating tool accessory designed to cut sheet metal up to 5/64” (2mm), aluminum profiles, copper pipes, wood with nails, and plastics — all with a single blade. The bi-metal construction combines high-speed steel teeth with a flexible alloy backing, which means it’ll handle the abuse of cutting through multiple materials without snapping or dulling prematurely.

At 1-3/4 inches wide and approximately 2-3/8 inches long, this blade uses Starlock Plus mounting for tool-free installation on compatible oscillating tools. The wavy universal toothing is what makes this blade versatile — those undulating teeth slice through dissimilar materials without binding or chattering.

Multi-Material Performance That Actually Matters

Here’s what separates this blade from the stack of single-purpose blades cluttering your toolbox. The wavy universal teeth designed for smooth, multi-material performance mean you’re not switching blades every time you hit a nail in trim work or need to cut through mixed materials in a renovation.

The blade cuts sheet metal up to 5/64 in (2 mm), aluminum profiles and extrusions, copper pipes and tubing, wood including wood with nails or screws, plastics and laminates, and handles trimming door jambs and flooring during installation. That covers 90% of what you’ll encounter in residential remodeling or commercial tenant improvements.

The waisted shape optimized for cutting speed and swarf removal isn’t just marketing speak. That hourglass profile creates space for debris to clear out instead of packing against the workpiece. Less friction, faster cuts, longer blade life.

Compared to HCS (High Carbon Steel) blades, the bi-metal construction offers significantly longer life, especially when cutting wood with nails or metal. HCS blades are fine for clean softwood. Hit one screw or nail, and those teeth are done. This bi-metal design keeps cutting.

Starlock Plus: The Mount That Doesn’t Waste Time

Tool-free ‘click-in’ installation means you align the Starlock Plus mount with the tool and press down until it locks — no hex key required. That’s actual time savings when you’re switching between materials throughout the day.

The blade is compatible with FEIN, Bosch, Festool, Milwaukee (with adapter), and Makita (with adapter) oscillating tools. Starlock Plus provides a tighter fit and higher clamping torque compared to standard Starlock, though these blades still fit standard Starlock tools. The tighter connection means less vibration and more accurate cuts, especially in metal.

The Numbers That Matter

Specification	Value
Width	1-3/4 in (44 mm)
Length	Approx 2-3/8 in (60 mm)
Material	Bi-Metal (High-Speed Steel teeth with flexible alloy backing)
Mount Type	Starlock Plus (Backward compatible with Starlock)
Teeth Type	Wavy universal toothing
Shape	Waisted (optimized for cutting speed and swarf removal)

Pack sizes include 3-pack (63502152270), 10-pack (63502152290), and 50-pack (63502152250), so you can buy based on usage volume.

This blade earns its place in a professional’s kit through genuine versatility. The bi-metal construction and wavy tooth pattern handle the mixed-material reality of Montana construction — from cutting copper pipe in a crawlspace to trimming door jambs in a log home. Compared to narrower 1-3/8 inch standard E-Cut blades, the 1-3/4 inch width provides a larger surface area and faster material removal per pass.

Skip it if you’re only cutting clean softwood. A standard HCS blade costs less and cuts just as well in single-material applications. But for the daily reality of renovation work where you never know what’s behind that wall or what fasteners are hiding in that trim, this universal blade saves blade changes and gets the job done.

Users value the speed of the Starlock system and the durability of the bi-metal teeth, with retailer pages typically showing high star ratings (4.5+ stars) for Fein E-Cut accessories. That’s the consensus from contractors who’ve put these blades through actual jobsite use.

The blade is covered by standard Fein manufacturer’s warranty against defects in materials and workmanship, with terms generally covering initial product defects. California Proposition 65 Warning applies (Cancer and Reproductive Harm), and the blade meets Starlock Plus interface standard compliance.

Frequently Asked Questions

Q: What materials can the Fein OTA 1-3/4” E-Cut Universal Bi-Metal Blade actually cut through?

The Fein OTA 1-3/4” E-Cut Universal Bi-Metal Blade cuts sheet metal up to 5/64” (2mm), aluminum profiles, copper pipes, wood including wood with nails or screws, plastics, laminates, and drywall. The wavy universal tooth design allows it to handle multiple materials without blade changes, making it ideal for renovation work where you encounter mixed materials.

Q: Which oscillating tools are compatible with this Fein blade?

The Fein OTA 1-3/4” blade uses Starlock Plus mounting and is compatible with FEIN, Bosch, and Festool oscillating tools directly, plus Milwaukee and Makita tools with adapters. The Starlock Plus mount is backward compatible with standard Starlock tools, though Starlock Plus provides tighter clamping and less vibration.

Q: How does the bi-metal construction compare to standard HCS blades?

The Fein OTA 1-3/4” bi-metal blade combines high-speed steel teeth with a flexible alloy backing, offering significantly longer life than HCS (High Carbon Steel) blades, especially when cutting wood with nails or metal. HCS blades work fine for clean softwood but lose their teeth quickly when hitting screws or nails, while this bi-metal design keeps cutting through mixed materials.

Q: What pack sizes are available for the Fein OTA 1-3/4” blade?

The Fein OTA 1-3/4” E-Cut Universal Bi-Metal Blade comes in three pack sizes: 3-pack (SKU 63502152270), 10-pack (SKU 63502152290), and 50-pack (SKU 63502152250). Professional contractors typically buy the 10-pack or 50-pack based on their volume of multi-material cutting work.

Q: How does the 1-3/4” width compare to narrower oscillating blades?

The Fein OTA 1-3/4” blade provides a larger cutting surface area compared to standard 1-3/8” E-Cut blades, resulting in faster material removal per pass. The wider blade with its waisted shape creates better debris clearance and reduces friction during cuts, especially important when working through tougher materials like aluminum or wood with embedded fasteners.

Q: Do I need any tools to install this blade on my oscillating tool?

No tools are required to install the Fein OTA 1-3/4” blade — it uses tool-free ‘click-in’ installation where you align the Starlock Plus mount with your tool and press down until it locks. This saves time when switching between different cutting tasks throughout the day.