MICROJIG Splitter Guide: Choosing the Right Setup for Your Saw

Best for: Full kerf blade users needing steel reinforcement

Pros

• Steel-core durability
• Four offset alignment splitters
• Kerf Keepers prevent binding

Cons

• Full kerf blades only
• Requires zero clearance insert

The MICROJIG GRR-RIPPER MJ SPLITTER Steel Pro is engineered specifically for woodworkers operating table saws equipped with traditional full kerf blades. Designed as a dedicated safety upgrade for machinery that lacks a factory riving knife, this system utilizes a rigid stainless steel core surrounded by a protective ABS polymer shell. The steel core eliminates flex under heavy lateral pressure, preventing dense hardwoods from deflecting the splitter during demanding cuts. Each package provides four individual splitters with marked offsets of 0.000, 0.003, 0.006, and 0.009 inches, granting woodworkers the micro-adjustability required to dial in absolute alignment relative to the blade and rip fence.

Supplied with the SP-2 system are four specialized Kerf Keepers designed for a kerf range spanning 0.118 inches to 0.145 inches. These devices act as traveling wedges that hold the sawn kerf open behind the cut, and they automatically eject if internal timber stresses cause the board to pinch tight against the insert. The complete installation kit includes a precision drill guide, a 3/16-inch drill bit, and mounting screws, enabling accurate placement into a user-supplied zero-clearance throat plate. Pairing this robust splitter setup with stable stock control, such as jessem stock guides for table saw operations, creates an ultra-reliable feed path that minimizes workpiece burning and binding.

This model is best suited for serious cabinetmakers, furniture builders, and hobbyists who run standard 1/8-inch full kerf blades through heavy, stress-prone solid lumber. Because it relies on a dual-pin configuration with solid steel cores, it provides substantially more rigid resistance against blade pinching than unreinforced polymer models. However, woodworkers running modern lower-horsepower contractor saws with thin kerf tooling will find the physical thickness of this splitter too wide, meaning they must step down to MICROJIG’s dedicated thin kerf safety options instead.

Best for: Hobbyists wanting lightweight thin kerf kickback control

Pros

• Mini-featherboard action
• Kerf Keepers maintain path
• Simple zero clearance installation

Cons

• Lacks stainless steel core
• Plastic construction flexes under pressure

Best for: Woodworkers running thin kerf blades on hardwoods

Pros

• Thin kerf blade support
• Reinforced stainless steel core
• Precision drill guide included

Cons

• Limited to 90 degree cuts
• Insert plate not included

The MICROJIG MJ SPLITTER Steel Pro thin kerf edition, cataloged under model number SP-2TK, addresses the specific mechanical needs of narrow blades. Thin kerf blades, typically measuring 3/32 of an inch, create a tight channel that quickly binds if stock shifts even slightly during a cut. To combat this, this microjig thin kerf splitter uses a dual-component design featuring a polycarbonate shell reinforced with a solid stainless steel core. This structural reinforcement ensures that the narrow profile remains stiff and upright even when subjected to intense side pressure from twisted or cupped lumber.

The SP-2TK package includes four thin kerf splitters with built-in precision offsets, three Kerf Keepers, a precision drill guide, a 3/16-inch drill bit, and installation hardware. Installation centers on mounting the dual splitters directly into a wood or plastic throat plate behind the blade kerf. The drill guide registers directly off the blade slot to center the mounting holes with exact tolerances. When properly installed on saws utilizing 8-inch to 12-inch blades, the dual splitter setup holds the cut open and applies constant lateral guidance, functioning like an integrated mini-featherboard to eliminate burning along cut edges.

This thin kerf model is the ideal match for woodworkers operating benchtop, jobsite, or contractor saws that lack the motor power to efficiently spin full kerf blades. It provides the same structural steel rigidity as the full kerf version while respecting the strict tolerances of narrower 3/32-inch tooling. If your workshop operates standard full kerf blades, attempting to pass timber through this thin kerf model will allow the tail end of the board to drift laterally, requiring you to transition back to the full kerf Steel Pro.

The MICROJIG MJ Splitter Thin Kerf Table model, designated as SP-0100TK, represents the brand’s classic, all-polymer approach to 3/32-inch blade safety. Rather than utilizing a solid internal steel core, this unit relies on high-grade molded plastic paired with high-speed steel mounting components. It is engineered to introduce flexible, spring-like tension behind the blade through built-in mini-featherboard technology. This lateral pressure keeps the stock pressed flat against the fence, ensuring a smooth feed rate and clean cut surfaces free of unsightly blade marks or scorching.

Designed for fast installation on wood or plastic zero clearance throat plates, the system comes with an alignment drill guide and patented Kerf Keepers. As you push long hardwood or sheet goods past the blade, the Kerf Keepers sit in the saw kerf to prevent internal wood tension from closing up around the arbor. The package is lightweight at just 1.6 ounces and fits directly into standard workshop throat plates. It delivers essential table saw kickback prevention for everyday joinery and cross-grain ripping where extreme core stiffness is not strictly required.

Woodworking hobbyists and makers undertaking light furniture projects, small boxes, and general trim work will appreciate the forgiving nature and straightforward function of the SP-0100TK. The slight mechanical flex in the polymer body accommodates minor feed variations without marring delicate woods. However, when processing heavy, gnarly hardwoods with intense internal drying case-hardening, the unreinforced polymer body can yield slightly under extreme lateral binding, making the Steel Pro thin kerf edition the stronger choice for rugged milling.

Best for: Makers needing complete hand safety and 3D control

Pros

• Controls keeper and offcut piece
• Multi-machine workshop utility
• Includes SafeRip kit

Cons

• Not an insert-mounted splitter
• Requires manual workpiece guidance

Moving beyond stationary insert accessories, the GRR-RIPPER+ by Microjig. Includes SafeRip Kit. provides a dynamic approach to shop safety and material management. Instead of mounting behind the blade into a throat plate, this hand-powered safety system functions as a fully adjustable 3D push block that controls both sides of the workpiece throughout the entire cutting process. It utilizes proprietary Green GRR-RIP high-traction polymer on the contact pads to exert downward, inward, and forward pressure simultaneously, keeping the workpiece registered firmly against the table surface and the fence.

The integrated grr-ripper safe rip kit enhances material handling by preventing accidental blade contact, acting as a moving-blade guard that shields the operator’s hands while cutting narrow strips down to 1/4 inch by 1/4 inch. While traditional table saw splitters focus strictly on preventing the trailing kerf from pinching, the GRR-RIPPER+ prevents kickback by locking down the offcut piece and the keeper board through the cut cycle. In workshops configured with precision alignment tools like a tso fence for table saw setups, pairing that accuracy with complete 3D downward force guarantees surgical cut quality and superior operator protection.

This system serves makers, vloggers, and hobbyists who cut small, delicate parts, narrow stock, or variable materials on table saws, router tables, jointers, and band saws. It operates independent of blade kerf dimensions, making it universally compatible across any machine in your shop. However, because it is an active hand-held push block rather than a passive kerf wedge, it does not permanently occupy the throat plate behind the blade. For long rip cuts in wide sheet goods or heavy boards, combining the GRR-RIPPER+ with a zero clearance insert splitter offers the ultimate dual-layer defense.

Best for: High-volume shops wanting extra replacement steel inserts

Pros

• Includes spare steel splitters
• Rigid ABS polymer casing
• Marked offsets for micro-adjustments

Cons

• Restricted to full kerf blades
• Throat plate requires drilling

The MICROJIG Steel Pro Full Kerf Splitter bundle (model SP-2+SP-P3) is the heavy-duty package tailored for shops that process high volumes of solid lumber. Like the standard Steel Pro, this system is built with a 100% polycarbonate shell reinforced by a solid stainless steel core, creating an exceptionally rigid barrier against kerf pinching. It is calibrated specifically for full kerf 1/8-inch 10-inch saw blades, accommodating kerf dimensions from 0.118 inches up to 0.145 inches for standard 90-degree cuts.

What sets this SP-2+SP-P3 package apart is the inclusion of the complete SteelPro Full Kerf Splitter Kit alongside two additional replacement steel splitters. In total, the user receives four main SteelPro splitters, four Kerf Keepers, extra steel inserts, and the precision drill guide. The splitters feature distinct plus-sign markings that indicate specific offset steps, allowing woodworkers to micro-adjust blade-to-splitter clearance based on tooth geometry. Using a reliable pushing aid, such as an ergonomic bow push stick for table saw feeds, alongside this rigid dual-splitter layout ensures hands remain safely away from the cut zone while material travels true.

Production woodworkers, cabinet shops, and heavy timber fabricators will benefit most from this expanded kit. Having extra replacement steel splitters on hand ensures that if an insert is misplaced or configured for an alternate throat plate, the saw remains fully operational without downtime. Woodworkers who rarely cut heavy hardwoods or those dedicated strictly to thin kerf tooling will find the additional inserts and heavy-duty full kerf sizing unnecessary, making the standard single-kit offerings more appropriate.

Best for: Classic full kerf ripping on a budget

Pros

• Mini-featherboard fence pressure
• Three-year limited warranty
• Quick removal for non-through cuts

Cons

• Unreinforced polymer shell
• Two splitters instead of four

The MICROJIG GRR-RIPPER SP-0125 Mj Splitter is the original, time-tested aftermarket splitter designed for standard 1/8-inch full kerf saw blades. Built from tough, resilient polycarbonate plastic without an internal steel spine, this classic microjig full kerf splitter provides dependable kickback prevention and burn reduction in a simple, streamlined package. The unit installs directly into phenolic, wood, or solid plastic zero-clearance inserts using the supplied installation drill guide, 3/16-inch drill bit, and mounting hardware.

The SP-0125 model utilizes MICROJIG’s mini-featherboard concept, employing offset plastic pins to maintain steady, gentle lateral pressure against the fence side of the workpiece. This pressure prevents the stock from drifting away from the fence line during through cuts, maintaining straight tracking and eliminating edge burning. Because each splitter is a low-profile wafer that seats snugly into two drilled holes in the throat plate, it can be lifted out in seconds without tools whenever non-through cuts, bevels, or dado operations are required.

This classic model is well suited for budget-conscious hobbyists and woodworkers seeking a basic, proven table saw splitter safety system for standard 1/8-inch blades. It delivers reliable performance across softwoods, plywood, and moderate hardwood rips. However, because it lacks the internal stainless steel core found in the Steel Pro series, it does not offer the same absolute rigidity when handling wide, dense hardwood slabs with severe drying tension, where the SP-2 or SP-2+SP-P3 represents the superior choice.