What's inside
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Drawer slides determine how useful a workshop cabinet is. A drawer that opens only three-quarters of its depth can hide drill bits, sockets, and fasteners at the back. A full-extension drawer brings the entire box into view, but it costs more, takes more care to install, and may not be the best choice for every drawer.
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What “full extension” and “standard” mean
Most workshop drawers use side-mounted ball-bearing slides. A standard, or partial-extension, slide usually opens far enough to expose roughly 75% of the drawer. The slide leaves part of the drawer inside the cabinet, often 3 to 6 inches depending on the drawer depth.
A full-extension slide opens the drawer box nearly all the way. You can reach the rear without leaning over the drawer front or unloading its contents. Some slides are sold as “100% extension,” although the actual opening may stop slightly short of the drawer’s full outside depth because of the slide design and front clearance.
Do not confuse extension with load capacity. A slide can be full extension and still be a poor choice for a drawer packed with sockets or hand tools. Check the manufacturer’s rating, mounting requirements, and whether that rating applies per pair or per individual slide.
Full extension versus standard slides
| Factor | Full-extension slides | Standard slides |
|---|---|---|
| Access | Nearly the entire drawer is visible and reachable | The rear section remains partly hidden |
| Typical cost | Higher, especially at heavy-duty capacities | Lower and widely available |
| Installation tolerance | Needs accurate, parallel mounting | Usually more forgiving |
| Best use | Deep drawers, heavy tools, and frequently used items | Shallow drawers, light supplies, and low-cost cabinets |
| Failure risk | Can bind or sag when overloaded or misaligned | Still wears out, but has less travel to support |
Where full extension is worth paying for
Full extension earns its cost on drawers deeper than about 18 inches. In a 24-inch-deep drawer, a partial slide can leave 6 inches of storage effectively buried. That is a poor arrangement for items you use often, such as measuring tools, router accessories, sanding supplies, or electrical testers.
It also makes sense for heavy drawers where contents need to be identified before lifting them out. A socket drawer, hand-plane drawer, or drawer holding cordless-tool batteries is easier to organize when every compartment is visible. Choose slides rated for at least 100 pounds for a moderately loaded tool drawer, and consider 150 to 200 pounds for a wide drawer full of metal tools.
Use full-extension heavy-duty drawer slides when the drawer will carry substantial weight. For very wide drawers, capacity alone is not enough. A 36-inch-wide drawer can twist under an uneven load, even with high-rated slides. Keep heavy items distributed from side to side, and consider a center support or a narrower pair of drawers.
When standard slides are the sensible choice
Partial-extension slides are perfectly adequate for shallow drawers, especially those 12 inches deep or less. If a drawer holds screws, pencils, utility knives, shop rags, or sanding discs, the rear portion is easy to reach and the cost savings are useful.
They are also a reasonable choice for rarely used storage. A drawer containing spare fasteners or seasonal finishing supplies does not need the same access as a drawer used every hour. If the drawer is only 3 or 4 inches high, full extension may add little practical benefit.
Standard slides can be the better option for a simple plywood workbench. They are often easier to source and less painful to replace after years of dust and abuse. If the cabinet is temporary, the drawers are inexpensive to build, or the contents are light, there is no need to specify premium slides throughout the shop.
For this type of storage, standard side-mount drawer slides are usually the economical solution. Verify that the slide length fits the cabinet and that its closed length does not exceed the drawer depth.
Installation details that prevent problems
Measure the required side clearance before building the drawer. Many side-mount slides need about 1/2 inch of clearance on each side, but some heavy-duty products require more. A drawer that is even 1/16 inch too wide can bind. A drawer that is too narrow may have loose slides, excessive side movement, or a reduced load rating.
Mount both cabinet members at exactly the same height and keep them parallel front to back. Use a spacer block or an installation jig instead of measuring every hole independently. The cabinet must also be square. If the front and rear openings are offset, a full-extension slide will reveal the error quickly by dragging or failing to latch.
Leave enough clearance below the drawer above it. Tool drawers often sag slightly under load, and a tight 1/8-inch gap can disappear. For a heavily loaded drawer, a 1/4-inch vertical gap is safer, particularly in a cabinet made from plywood rather than rigid hardwood.
Dust, load, and shop maintenance
Wood dust is hard on ball-bearing slides. Fine dust can mix with grease and make the bearings gritty; chips can stop a slide from closing fully. Full-extension slides expose more of their moving hardware, so they generally deserve more cleaning attention in a dusty shop.
Put a top on the cabinet or install it away from the table saw’s discharge path. Use your dust collector and keep the drawer fronts closed when cutting. Vacuum the slide tracks periodically with a crevice tool. Do not spray thick oil into a dusty bearing slide. If lubrication is permitted by the manufacturer, use a light dry lubricant sparingly.
Never treat the load rating as permission to slam an overloaded drawer. A slide rated at 100 pounds may support that load when properly mounted, evenly distributed, and fully closed. Repeatedly pulling it open by one corner can bend the slide or loosen the screws. Use at least 5/8-inch plywood for a heavy drawer bottom, glue and screw the drawer joints, and add a bottom support if the drawer is wide.
A practical buying rule
Choose full extension for deep drawers, heavy tools, and anything you inspect or retrieve daily. Choose standard slides for shallow, lightly loaded, or rarely accessed drawers. If you are building only a few drawers, upgrading the important ones is a good compromise rather than installing expensive slides everywhere.
For cabinets that must handle large loads, look at 200-pound full-extension drawer slides, but confirm the cabinet construction can transfer that load into the sides. If low-profile storage matters more than maximum capacity, low-profile full-extension slides can save drawer width, though they may have stricter clearance and mounting requirements. The slide should match the drawer, not compensate for a weak cabinet or poorly fitted box.