Best Timber Framing Chisels for Deep Mortises and Heavy-Duty Work
Timber framing chisels are essential for cleaning out large mortises, shaping joints, and working on heavy timber projects. The right set delivers blade strength, long reach, and reliable edge retention. Below are five high-quality options from Robert Sorby that suit deep mortises, corner work, and heavy-duty framing tasks. Each entry includes key features and practical notes for professional or serious hobbyist use.
| Product | Brand | Key Use |
|---|---|---|
| Bundle Robert Sorby 3 Piece Set Timber Framing Firmer Chisels (1, 1-1/2 and 2 Inches) | Robert Sorby | Deep mortises, heavy-duty framing |
| 2-3/8″ Robert Sorby #289 Timber Framers’ Slick | Robert Sorby | Long paring cuts, deep mortises |
| Robery Sorby 287 1” Heavy Duty Timber Framing Corner Chisel | Robert Sorby | Clean corners, large mortises |
| Bundle Robert Sorby 289/289H60 2-3/8 Inch Massive Timber Framing Chisel/Slick | Robert Sorby | Uneven surfaces, deep mortises |
| Bundle Robert Sorby 3 Piece Set Timber Framing Chisels With Bevel Edges | Robert Sorby | Undercutting, tight corners |
Note: Each product features Ash handles over long blades designed for leverage and control. All selections are suited for pro-grade timber framing tasks, including mortise cleaning, bevel cutting, and flank work along deep joints.
Robert Sorby 3-Piece Firmers Set (1″, 1-1/2″, 2″)
This 3-piece firmer chisel set provides substantial blade widths for rapid material removal in large mortises. Each chisel pairs a long blade with a 9 inch Ash handle, offering 10-1/2 inch blade length for deep work. Overall length is about 19-1/2 inches, ensuring solid leverage during heavy framing tasks. Commonly used for clearance, flattening shoulders, and truing mortise walls.
Robert Sorby 289 Timber Framers’ Slick (2-3/8″)
This timber framer’s slick features a 17-inch Ash handle and an 11-inch blade with a total length of 28 inches. The blade is offset from the handle to provide extra clearance for deep mortises and long paring cuts. Constructed from high carbon steel, it balances hardness with toughness to maintain a razor-sharp edge through demanding framing work.
Robert Sorby 287 1″ Heavy-Duty Timber Framing Corner Chisel
This substantial 1-inch corner chisel is ideal for cleaning and shaping corners on large mortises. It includes a 9-3/8 inch blade and a 9-1/8 inch Ash handle, with an overall length of 18-1/2 inches. The tool features a traditional bolster, double steel hoops, and a leather shock washer for durability during repeated blows in tough timbers.
Robert Sorby 289/289H60 Timber Framing Chisel/Slick With Leather Holster
This massive 2-3/8-inch slick is designed for cleaning up uneven surfaces on timber framing projects. It includes a long 17-inch Ash handle and an 11-inch blade, with an overall length of 28 inches. The blade’s offset from the handle allows extra clearance when working on deep mortises or taking long paring cuts, making it a versatile choice for large-scale work.
Robert Sorby 3-Piece Bevel-Edged Timber Framing Set
This bevel-edged 3-piece set includes sizes of 1″, 1-1/2″, and 2″ with leather edge guards. Bevel edges help in undercutting and working in tight corners. An Ash handle with a 10-1/2 inch blade length, paired with a 19-1/2 inch overall length, provides a robust configuration for heavy-duty mortising and shaping tasks.
Buying Guide
Key considerations when selecting timber framing chisels include blade width variety, blade geometry, handle comfort, and overall tool balance. Narrower widths (1″ and 1-1/2″) excel in detail work and corner cleanup, while wider chisels (2″ and above) enable faster stock removal and material shaping in large mortises. A bevel edge can aid undercutting in tight joints, though some work benefits from a flat edge for flattening surfaces. Off-set blades reduce handle-to-work interference in deep mortises, improving clearance and control. Look for high-carbon steel for edge retention and durable bolsters for prolonged use. A leather edge guard or holster adds protection in transport and storage. For versatility, a set including both firmer chisels and slicks provides the best coverage for framing tasks.
Durability and balance are critical: long handles improve leverage on heavy cuts, while a well-aimed bevel or offset blade reduces the risk of chatter and slips when working near shoulder lines. Consider the finish and fit of the handle—Ash is common for timbersmithing due to its resilience and shock absorption. Some kits accompany a protective holster or leather guard, which helps prevent accidental damage to blades during transport. Finally, ensure compatibility with your existing toolkit, especially if you rely on consistent blade widths across multiple projects.