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A smoothing plane is a short bench plane for fine finishing passes on wood that has already been prepared. It is not the tool to reach for first to flatten a rough, twisted board: its job is to refine the surface before finishing.
What is a smoothing plane used for?
A smoother takes fine shavings to refine a prepared wood surface near the end of stock preparation. Lie-Nielsen describes its No. 4 as taking the finest shavings after other planes have done the preparatory work. In practical terms, use a smoother to refine a surface, not to do the heavy flattening that comes first.
What does a No. 4 smoothing plane look like?
No. 4 is a standard size designation, but dimensions and construction vary by maker. Two examples show why it is worth checking each model’s specifications:
| Model | Listed dimensions and weight | Construction and adjustment details |
|---|---|---|
| Lie-Nielsen No. 4 Smooth Plane, Iron | 9½ inches long; 2-inch-wide, ⅛-inch-thick blade; 4-pound iron body. Source: Lie-Nielsen product page. | Maker specifies a 45-degree bevel-down blade and describes a rear-adjustable frog for changing the mouth opening. Source: Lie-Nielsen product page. |
| Stanley No. 4 SweetHeart, model 12-136 | 10⅝ inches overall; 2-inch blade made from ⅛-inch A2 steel. Source: Stanley product page. | One-piece base and frog, Norris-type adjuster, and adjustable throat plate. Replacement blade: Stanley 12-141, specified for the 12-136. Source: Stanley product page. |
How to choose a smoothing plane
There is no established overall winner from these manufacturer descriptions. Compare the details that affect fit for your work and preferences rather than treating a model number or brand as a guarantee of suitability.
The Tool Desk
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#1 Best Overall
Amazon Basics No.4 Adjustable Precision Smoothing Bench Hand Plane with 2-Inch Blade and Wooden Handles for Woodworking, Brown
- No. 4 adjustable precision smoothing bench hand plane for woodworking and carpentry projects
- Durable cast iron body provides stability and strength
- Impact-resistant wood handle with contoured grip
- Durable steel alloy blade makes quality cuts
- Adjustable gear that allows you to achieve precise results
- Size and mass: The cited No. 4s differ in listed length, and Lie-Nielsen lists its iron model at 4 pounds. Consider the dimensions and weight that feel manageable for your work.
- Blade and replacement support: Stanley lists A2 steel for the 12-136 and names blade 12-141 as its replacement. Confirm replacement-part compatibility with the exact model.
- Mouth adjustment: Stanley lists an adjustable throat plate; Lie-Nielsen describes a frog adjusted from the rear to change the mouth opening. These are different mechanisms, not evidence that one plane produces a better finish.
- Condition and setup: The manufacturer pages do not provide a controlled comparison of new and vintage planes or their setup effort. Check a specific plane’s condition and whether you are prepared to sharpen and adjust it.
Price and stock are especially time-sensitive. On October 8, 2026, Lie-Nielsen’s product page marked its iron No. 4 unavailable and listed it at $375; verify current availability and price directly before buying. Lie-Nielsen product page.
How to set up a smoother
Use the instructions for the specific plane in hand. The following settings are Lie-Nielsen’s guidance for its bench planes, not universal requirements for every make or model.
Rank #2
Dreyoo No.4 Adjustable Hand Planer with 2 Inch Replacement Blade, Wood Planer for Woodworking, Smoothing Bench Plane Jointer Plane for DIY Door Installation
- With Replacement Blade: additional 2 inch blade is provided for use; They are made of manganese steel which features high hardness and wear resistance after tempering; More Sharper, allows for smooth movement
- More Accurate: about depth adjustment, adopted a barbell shape design, easier and more accurate to adjust the cutting depth; Clamping screw with a big red cap for easily fixing the blade
- Sturdy Build: the hand planer body is made of sturdy carbon steel for strength and stability; Red epoxy coating is not only of an aesthetic appeal, but rust resistant; A reliable tool for woodworking professionals and beginners
- Easy Adjustment: 1. place the blade onto the base (cutter edge face down); The blade adjustment slots must fit around the depth adjustment wheels; 2. Slightly tighten the clamping screw; 4. Tighten the blade screws and the clamping screw
- Easy to Grip: 9 inch long body with a flat sole eliminates blade judder, allowing smooth movement; High impact polymer handles and guidance knobs are designed ergonomically and polished to maximize user comfort
- Start with the blade’s bedding angle. Lie-Nielsen specifies a 45-degree bevel-down blade on its bench planes.
- Hone the edge. The maker says an optional 5- or 10-degree secondary bevel can improve edge performance, help establish a sharp edge quickly, and improve edge life in hardwoods.
- Adjust the blade without leaving backlash. Lie-Nielsen advises advancing the blade forward at the end of adjustment to take up backlash.
- Set the mouth opening if needed. The maker’s instructions say to loosen the frog’s locking screws before adjusting the mouth.
- Position the chipbreaker for the cut. Lie-Nielsen suggests about 1/16 inch from the cutting edge for general work and moving it closer for the finest smoothing.
For the exact adjustment sequence and any model-specific cautions, consult the plane’s manual. Lie-Nielsen No. 4 product page and setup instructions.
Quick Recap
Bestseller No. 1
Bestseller No. 3
Bestseller No. 4
Best Value
Sale
Stanley 1-12-004 Smooth Plane Bailey No. 4, Multicolor
- Professional smoothing plane
- Simple and Rapid adjustment mechanism
- Made from accurately machined fine grey iron castings
Rank #4
Taytools #4 Premium Bedrock Style Flattop Smoothing Plane Bench Plane - 9-3/8" Long Sole, 2" Wide Blade Cryo O1 Steel
- Inspired by Stanley Bedrock Planes – Designed for superior rigidity, precision, and durability, ensuring high-performance smoothing with minimal chatter and tearout.
- Premium Ductile Cast Iron Body & Frog – Provides maximum stability and longevity, with a precision-lapped sole for perfectly flat, accurate planing.
- High-Quality Blade for Superior Edge Retention – 0.120"-thick, 2"-wide cryogenically treated O1 steel iron, hardened to 54-58 HRc for long-lasting sharpness and easy sharpening.
- Advanced Frog Adjustment System – Inspired by the Stanley Bedrock design, allowing precise mouth adjustments without removing the iron for optimal shaving thickness and reduced tearout.
- Perfectly Balanced for Finishing Tasks – Weighs 4.3 lbs and measures 9-3/8" long by 2-3/8" wide, ideal for fine finishing on softwoods, hardwoods, and figured grain.
Rank #3
Hoteche No.4 Wood Plane - Adjustable Smoothing Bench Hand Planer for Woodworking and Trimming - 9.5-Inch Jointer Plane with 2-Inch Blade
- Precision and Accuracy: Hoteche No.4 Wood Plane is designed for precise cuts and finishes, with a 9.5-inch length and 2-inch blade that make it ideal for shaping and smoothing wood with accuracy and precision
- Versatile Tool: This wood plane is perfect for a variety of woodworking projects, including shaping molding, creating jointed edges, and smoothing rough or uneven surfaces
- Traditional and Timeless: The No.4 Wood Plane has been used for centuries and is still valued today for its accuracy and versatility in woodworking and carpentry
- High-Quality Material: Made of high carbon steel, Hoteche Wood Plane is durable and built to withstand the rigors of heavy use, making it a reliable tool for professionals and DIY enthusiasts alike
- Greater Control: Operated manually with a back-and-forth motion, Hoteche Wood Plane gives users greater control over the shaping and smoothing process, allowing for more personalized and fine-tuned results, making it ideal for custom and intricate projects
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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