To make an adjustable wooden miter bar, cut a hardwood strip to fit loosely in your saw’s miter slot, add flexible tabs and setscrews, then expand the tabs just enough to remove side play while keeping the bar free-sliding. Measure your own slot first: WOOD Magazine says most slots are 3/4 inch wide, but that is not universal.
What you need to know before making one
An adjustable miter bar fits a table-saw slot and can be attached beneath a sled or jig. Its adjustment compensates for a small amount of clearance between the bar and the slot. The goal is not a press fit: the bar should travel smoothly without wobbling sideways or binding.
WOOD Magazine’s main method uses a 3/8-inch-thick hardwood strip—hard maple is preferred—cut about 1/64 inch narrower than the measured slot. Its March 6, 2025 instructions describe a bar designed around a particular saw’s slot, not a guaranteed fit or accuracy result for every machine. See WOOD Magazine’s adjustable miter-bar instructions.
Make the flexible-tab version
Materials and tools
- Hardwood stock, preferably hard maple, at least 3/8 inch thick
- Three 1/8-inch setscrews
- A saw for ripping the strip and cutting kerfs
- A drill and a 1/8-inch bit
- A measuring tool suitable for checking the miter slot
Cut and adjust the bar
- Disconnect the saw from power. Keep it disconnected while measuring, fitting and adjusting the bar. Follow the safety instructions for your particular saw and jig.
- Measure the slot. Check the width of the slot where the bar will run; do not assume it is exactly 3/4 inch. Measure its depth as well so the bar will not sit too high or interfere with the workpiece or jig.
- Rip the hardwood strip. Make it 3/8 inch thick and about 1/64 inch narrower than the measured slot. This initial clearance gives the bar room to slide before adjustment.
- Cut three J-shaped kerfs. These kerfs form flexible tabs in the bar. Follow the geometry shown in WOOD Magazine’s method; the kerfs must leave the tabs intact and able to flex.
- Drill a hole in each tab. Drill a 1/8-inch hole into each tab, stopping short of drilling through the kerf.
- Install the setscrews. Thread one 1/8-inch setscrew into each hole. The screws should bear against the tab so that tightening them pushes it outward.
- Test the fit and adjust incrementally. Place the bar in the slot and slide it to check for side-to-side movement. If it is loose, tighten the setscrews until they bottom out; further tightening pushes the tabs outward. Adjust only enough to remove side play while preserving a smooth slide.
- Attach the fitted bar to the jig. Once the bar moves freely without side-to-side play, fasten it to the sled or jig using a layout that keeps it aligned with the intended travel.
WOOD Magazine describes the desired result this way: “When the bar slides freely in the slot with no side-to-side play, the fit is perfect.” That is a fitting target, not a promise that the bar will make every jig accurate; the result depends on the particular slot, bar and care taken during fitting.
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- Expansion collars help reduce sled play: Fine-tune each expansion collar from above with the included hex key to reduce side-to-side movement without removing the bars, helping crosscut and table saw sleds track more smoothly through the miter slot
- Rounded Entry for Smoother Setup: The rounded leading end helps each runner enter the miter slot with less catching during setup, making repeated test fits easier when building crosscut sleds, taper sleds, and woodworking jigs
- Two Mounting Methods with Top Access: Attach the bars from above with 1/4"-20 machine screws or from underneath with wood screws; top access holes let you reach the collar adjustments after the sled is assembled
- Check Your Miter Slot Before Ordering: Made for standard 3/4" x 3/8" T-shaped and U-style slots and not for 5/8" slots; remove the retaining discs for a non-T-shaped straight slot as shown in the instructions
- Two 430mm Bars for Sled and Jig Builds: Use the pair for crosscut sleds, table saw sled runners, taper or jointer sleds, and compatible router-table jigs; includes mounting hardware, hex key, templates, and instructions
Another wooden design: routed expansion slots
A separate WOOD Magazine design, published July 19, 2023, adjusts the bar with expansion slots rather than J-shaped flexible tabs. It uses 3/8-inch maple strips cut for a loose fit in a 3/4-inch slot. This approach involves more precise slot machining and threaded holes. The dimensions below belong to that method; do not combine its steps with the J-kerf design.
- Cut a 3/8-inch maple strip for a loose fit in the slot.
- Drill 3/16-inch holes to form the ends of the expansion slots. Place the slots 3/16 inch from one edge, with one centered and one near each end.
- Connect the holes using a 1/8-inch straight router bit to create the expansion slots.
- Drill and tap 10-24 threads into the side of the bar, centered on the slots.
- Install 1/2-inch setscrews and use them to adjust the bar’s width in the slot.
This version calls for accurately routing the slots and tapping 10-24 threads. The tab version instead requires carefully cut J-shaped kerfs and holes that do not break through those kerfs. Choose based on which operations you can perform reliably. WOOD Magazine’s instructions for the routed-slot approach are at its miter-bar article.
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- Predrilled Holes: We reserve 5 screw holes on each plastic strip and provide matching screws. You don't need to process it in addition when you use, it's easy to operate
- Smooth Surface: UHMW plastic’s surface is very smooth, no burrs, no sawdust like wood, easy to clean. Low friction, ideal for sleds where repetitive sliding is necessary
- No Deformation: The molecular structure of UHMW is extremely stable, and it will not expand with heat and contract with cold like wood. Strong impact resistance making it extremely durable for constant repetitive use
- Size: The crosscut sled bars are 3/4" wide and 3/8" thick which fit most standard table saw slots. The length is 17", if you think the length is too short, you can splice multiple strips together
- Improve Efficiency: Make your crosscut sled to the size you want or need for your table saw and your specific cutting needs. It is very helpful for small cuts, cross cuts and repeat length cuts
Fit and safety checks
For a useful setup check, Grizzly’s H7583 tenoning-jig manual says to disconnect the saw, insert and slide the guide bar to assess play or tilt, adjust the screws evenly, and retest. It also calls for keeping the miter slot and table clear of burrs and debris. Those are sensible checks, but the manual’s adjustment procedure is specific to that jig; follow your own equipment’s instructions. See the Grizzly H7583 manual.
- Do not force a tight bar through the slot. Back off the adjustment until it slides freely.
- If the bar rocks or shifts sideways, check for debris, burrs, uneven adjustment or a bar that does not match the slot.
- Keep hands clear of the blade during fitting and testing, and follow the saw and jig manuals before reconnecting power.
- Grizzly warns not to remove the T-slot washers from the guide-bar ends on its H7583 jig because the jig could come loose during kickback. That warning applies to that jig; do not treat it as a universal design feature of every miter bar.
Should you build one or buy one?
A shop-made bar lets you size the fit to your machine, but it requires careful machining and adjustment. A purchased adjustable bar may save fabrication work; verify that its dimensions and mounting arrangement match your saw and jig. The available sources do not establish a controlled accuracy or durability comparison among these options.
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- Table Saw Sled Kit: You will receive 2 UHMW miter bars for table saw (17 in), 2 universal T-tracks (12 in), 1 star knob and bolt, 1 round washer, and 15 screws, fitting most standard table saw slots( Note: wooden sled not include).
- Well made: T-tracks are made of solid extruded aluminum and the table saw runners are made of UHMW linear polyethylene, durability, and smooth, surface burrs-free.
- Safe and Efficient: The crosscut sled for table saw aids in precise cutting, meeting various cutting needs, prevents measurement and cutting errors, and enhances safety and efficiency.
- Low Friction: UHMW miter bars for table saw are ideal for use as crosscut sled guide rails, and have low friction and stability without expansion or contraction due to environmental changes.
- Function: Table saw sled kit is perfect for crosscutting, repeat length cutting, and small cuts, stabilizing workpieces, included knobs and bolts can be used as simple stop blocks for consistent cuts without frequent adjustments to measure fence distance.
| Option | Adjustment method | What making or buying it involves | Availability and fit notes |
|---|---|---|---|
| Wooden J-kerf bar | Three setscrews push flexible kerf-cut tabs outward. | Rip 3/8-inch hardwood, cut three J-shaped kerfs and drill 1/8-inch holes without breaking through the kerfs. | Size to the measured slot; WOOD Magazine says most slots are 3/4 inch, not all. |
| Wooden routed-slot bar | 1/2-inch setscrews expand routed slots; holes are tapped 10-24. | Drill 3/16-inch slot-end holes, connect them with a 1/8-inch straight router bit, then drill and tap the threaded holes. | The cited WOOD Magazine method uses a loose-fitting 3/8-inch maple strip for a 3/4-inch slot; measure your own slot. |
| Kreg Jig & Fixture Bar, KMS7303 | Six adjustable nylon screws. | 30-inch anodized-aluminum bar with mounting holes every four inches. | Kreg lists it for standard 3/8 x 3/4-inch miter slots, but marks the model discontinued. Check current availability and verify any replacement’s dimensions before purchase: Kreg product page. |
The Kreg specifications show that adjustable commercial bars are a product category, not that this particular discontinued model is currently available or suitable for every saw. For any alternative, check slot width and depth, bar length and material, adjustment mechanism, mounting-hole pattern and current stock before ordering.
Quick Recap
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- 〖Product Material〗:This Crosscut Sled is made of ultra-high molecular weight polyethylene, which has the characteristics of super wear resistance, self-lubrication, high strength, stable chemical properties, and strong anti-aging performance
- 〖Product Design〗:The Miter Slot Runners are 17" (43mm) long, 3/4" (19mm) wide, and 3/8" (9.8mm) thick. Each rod has 5 precisely sized pre-drilled and countersunk holes to ensure that the screws can be inserted without rubbing against other contact surfaces
- 〖Product Features〗:This UHMW Miter Bar is easy to clean and will not expand or contract like wood. It does not absorb moisture and will not swell with exposure to air. It is ideal for the crosscut slide of a table saw due to its low coefficient of friction, making it an ideal choice for sleds that need to slide repeatedly
- 〖Versatile Application〗:The Crosscut Sled can be connected to most woodworking workpieces and can be used to build various fixtures on the table saw table, such as miter sledges, making crosscuts safer and more efficient. It is usually suitable for radial arm saws, benchtops, drill presses and various other engineering equipment. Simple design, powerful function, can well assist various cutting tasks
- 〖Package Includes〗:The package includes two 3/4" x 3/8" x 17" Crosscut Miter Bars and some self-tapping screws.If there is any problem with the item you received, please contact us for a replacement. We will try our best to provide you with satisfactory.
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- Predrilled Holes: We reserve 5 screw holes on each plastic strip and provide matching screws. You don't need to process it in addition when you use, it's easy to operate
- Smooth Surface: UHMW plastic’s surface is very smooth, no burrs, no sawdust like wood, easy to clean. Low friction, ideal for sleds where repetitive sliding is necessary
- No Deformation: The molecular structure of UHMW is extremely stable, and it will not expand with heat and contract with cold like wood. Strong impact resistance making it extremely durable for constant repetitive use
- Size: The crosscut sled bars are 3/4" wide and 3/8" thick which fit most standard table saw slots. The length is 17", if you think the length is too short, you can splice multiple strips together
- Improve Efficiency: Make your crosscut sled to the size you want or need for your table saw and your specific cutting needs. It is very helpful for small cuts, cross cuts and repeat length cuts
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.
