Best T Slot Bolts (2026): 4 Picks for Jigs and Fixtures

Specs compared

Specifications are manufacturer rated, as published on each listing and collected 22 October 2026. None of the four listings states a warranty term.

How to choose the best t slot bolts

Match the thread to your knobs and nuts

Thread is the first filter, because everything else on the jig has to match it. Three of the four picks use 1/4-20 thread: both POWERTEC bolts and the DALQUIS knob kit, whose washers state a 1/4 in inner diameter. If your knobs, flange nuts or hold-down clamps are already 1/4-20, any of those three drops in. The Yeasing set is the outlier at M8, aimed at aluminum extrusion profiles and solar mounting, where metric hardware is the norm. Mixing the two means a separate set of nuts, so decide the thread family before anything else. The POWERTEC listings state fully threaded, right-hand 1/4-20 bolts, which keeps the usable length predictable along the whole shank.

Pick the length for your stack

Length is measured against the stack: track slot, jig base, workpiece and the nut or knob on top. The POWERTEC QTB1008 gives 1-1/2 in of bolt, the comfortable choice when the jig base is thick or a tall knob sits on top. The QTB1004 gives 1 in for thinner stacks like a featherboard on a router table fence, where a longer bolt would stick out and snag. The DALQUIS kit covers both ends with 5 bolts at 1-1/4 in and 5 at 2 in, plus star knobs that add height of their own. The Yeasing hammer-head bolts state a 20 mm thread length and 24 mm total length for extrusion slots. When in doubt, the longer bolt in a kit is the one that gets used, since a bolt that is too long still tightens while a bolt that is too short does not reach.

Check the head against your track

The T-head is what keeps the bolt from pulling out of the slot, so its dimensions matter as much as the thread. The POWERTEC bolts state T-shaped heads at 3/4 in by 17/32 in by 7/64 in thick, designed for universal T-track or larger, and the listing warns they will not fit 1/4 in or Mini T-track. The Yeasing hammer-head bolts state a 10 mm wide, 4 mm thick, 23 mm long head for a 0.31 in compatible groove, which is the extrusion world rather than the woodworking track world. The DALQUIS kit states a bolt head of 0.71 in by 0.43 in by 0.08 in with star knobs 1.26 in across, built for hand tightening. Before ordering, measure the slot opening and the wider channel behind it: the head must slide in from the end or drop in, and then catch on the channel walls. The Yeasing hammer-head bolts are the drop-in type, made to enter the slot sideways, while the POWERTEC T-heads at 3/4 in wide suit tracks with a full-width channel. A caliper on the existing track beats guessing from a photo.

Steel, zinc or stainless

Material decides where the bolt can live. The POWERTEC bolts are zinc-plated carbon steel, Grade 2, which the maker pairs with corrosion resistance and rust protection for shop use. The DALQUIS hardware is galvanized steel with PP star knobs, a rust-resistant finish on the metal parts and wear-resistant plastic on the knobs. The Yeasing set steps up to A2-70 stainless steel with nickel plating, the pick of the group for damp environments or outdoor solar mounting where plain steel would stain. Stainless costs more per bolt, so match the material to the environment: zinc-plated steel for a dry shop, stainless where moisture or weather is part of the job. The POWERTEC listings back the steel with stated Grade 2 hardness and a 1/4-20 Unified National Coarse right-hand thread, and the maker claims the bolts withstand strong torque without stripping or over-tightening. Treat that as the maker’s claim rather than a measured figure, since no load numbers are stated.

For the rest of the workholding on the table, see the t slot bolts category and our cnc clamps for woodworking picks.

Count the pack against the project

A T-slot bolt is rarely bought singly, and the pack contents decide how many jigs one order equips. The POWERTEC listings each state a 20-pack of bolts, enough to outfit several fixtures or to keep spares when a bolt walks away from the bench. The DALQUIS kit states 10 sets, each with a bolt, a washer and a star knob in the box, so one kit clamps ten points and the two lengths split across five 1-1/4 in and five 2 in bolts. The Yeasing set states 10 bolts plus 10 flange nuts, a matched pair per mounting point on an extrusion frame. Before ordering, count the clamping points on the jig: a fence with two featherboards and two hold-downs needs several bolts, which one POWERTEC pack covers, while a full extrusion frame may want the matched nuts the Yeasing set includes. Spares are cheap insurance, since a T-bolt with a stripped thread sidelines the whole fixture.

Project Match

• Router table fences and featherboards: the POWERTEC QTB1008 at 1-1/2 in handles thicker jig bases with room for a knob.
• Drill press tables and thin jigs: the POWERTEC QTB1004 at 1 in keeps the bolt short where a long shank would snag.
• Aluminum extrusion frames, solar module mounts and photovoltaic roof hooks: the Yeasing M8 hammer-head set, whose listing names those uses.
• Jigs that get repositioned often: the DALQUIS knob kit, with star knobs for tool-free tightening and two bolt lengths in the box.
• Universal T-track on shop-built fixtures: either POWERTEC bolt, noting the listing excludes 1/4 in and Mini T-track.

How the scores add up

Each bolt is scored out of 10 on performance, build, value, safety and warranty, with the weights published on our How We Pick page. For T-slot bolts, performance means stated thread fit, usable length, head dimensions that match common tracks, and pack contents; build means stated material, finish and grade; safety means a stated load figure or certification, which none of these listings provides, so safety scores zero across the group; and no listing states a warranty term, so warranty scores zero too. A spec the listing does not publish scores nothing.

Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score. Safety counts only for powered gear or where the listing states safety features; where it does not apply, the score is taken over the remaining 90 points.

FAQ: lasers and CNC

What is a T bolt?

A T bolt has a T-shaped head that slides into a T-slot and cannot turn once seated, so a nut or knob on the threaded end clamps the work down. All four picks here use that principle in different sizes.

What is a T slot?

A T slot is a slot with a wider channel behind a narrower opening, cut into a track, a machine table or an aluminum extrusion profile. The T-head catches on the channel walls, which is what resists the pull of the clamp.

Will these fit my T-track?

The POWERTEC listings state their bolts fit universal T-track or larger and will not fit 1/4 in or Mini T-track, so measure the slot first. The DALQUIS kit states compatibility with universal track and double-cut track that accepts a standard 1/4 in bolt head. The Yeasing set is for 0.31 in grooves in aluminum extrusion, not woodworking tracks.

What is the difference between the two POWERTEC bolts?

Length only. The QTB1008 is 1-1/2 in long and the QTB1004 is 1 in long; both are 1/4-20, fully threaded, with the same 3/4 by 17/32 by 7/64 in head, zinc-plated carbon steel and a 20-pack. Pick the length that matches the stack being clamped.

Can I use the stainless Yeasing set on a woodworking T-track?

The listing aims it at aluminum extrusion assembly, solar modules and photovoltaic roof hooks, with an M8 thread and a 0.31 in compatible groove. Woodworking tracks and jigs in this group use 1/4-20 hardware, so the Yeasing set fits metric extrusion work rather than imperial T-tracks.

Related: the cnc tooling hub. Also see our cnc clamps for woodworking.