Makita's GRT01 XGT Rebar Tying Tool: Stronger Ties, 16-Gauge Wire, and What It Means for Ironworkers

Makita's GRT01 XGT Rebar Tying Tool: Stronger Ties, 16-Gauge Wire, and What It Means for Ironworkers

Published by Pacific Power Tools | Orange, CA

Rebar tying is one of those jobs that doesn't get a lot of attention — until you're 200 ties into a concrete pour and your hands are cramped, your pliers are slipping, and you're still three hours from done. Automatic rebar tiers changed that equation years ago, but they've always had a ceiling: the wire gauge they could handle, and the tie strength they could produce.

Makita just moved that ceiling.

The new Makita GRT01 40V max XGT® 16 Gauge Rebar Tying Tool is the world's first 40V rebar tying tool, and it uses 16-gauge wire — a meaningful step up from the 19-gauge wire that most automatic tiers run. The result is ties that are substantially stronger, a tying range that covers everything from wire mesh all the way up to #9 x #8 rebar, and run times that can hit 3,600 ties on a single charge. That's a full day of heavy tying work without stopping to swap batteries.

Not sure if that matters? Let me break it down.

Why 16-Gauge Wire Changes the Conversation

Most automatic rebar tiers on the market — including Makita's own 18V LXT® lineup — run thinner gauge tie wire. For standard residential and light fabricating shop work, that's fine. But heavier applications like road and bridge construction, tilt-up panels, and structural concrete in commercial buildings put real stress on every tie. 16-gauge wire produces a substantially stronger, tighter bind, and until now no cordless automatic tier could handle it.

The GRT01 delivers that with a brushless motor running off the 40V max XGT® platform — the same platform powering Makita's demolition hammers, power saws, and rebar cutters. That voltage headroom is what makes 16-gauge possible. The motor has enough torque to tension heavier wire consistently across all six of the tool's adjustable tie strength settings.

The practical upside: for jobs where tie strength is an inspection point — concrete that will be load-bearing, post-tensioned slabs, or anything subject to seismic engineering requirements — the GRT01 gets you there without reverting to hand-tying.

One Tool from Wire Mesh to #9 x #8 — The Full Range

This is one of the GRT01's most compelling practical advantages, and it's worth spelling out clearly.

The GRT01 ties everything from wire mesh crossing wire mesh — the lightest, most open work on any job — all the way up to #9 x #8 rebar combinations. Here's a practical way to think about the upper limit: add the two bar numbers together. The GRT01 handles any combination where those two numbers sum to 17 or less. That means #8 x #9, #7 x #8 (sums to 15), #5 x #5 x #5; #4 x #4 x #4 x #4; — the tool doesn't care which bars make up that sum. If it totals 17 or under, you can auto-tie it.

That's a genuinely wide range for a single tool. In practical terms it spans:

• Wire mesh x wire mesh — pool cages, flatwork, light slabs
• #3 x #3 through #5 x #5 — residential foundations, standard commercial slabs, retaining walls
• #6 x #7, #5 x #8 — heavier commercial and structural applications
• #7 x #8, #8 x #9 — bridge decks, heavy infrastructure, large columns and beams

The significance of that coverage becomes clear when you start looking at where the competition draws its own lines — which we'll get to shortly.

Who This Tool Is Built For

Makita designed the GRT01 with a specific set of trades in mind.

Ironworkers and rebar placers. The obvious primary user. If you're placing rebar on commercial jobs, the combination of 16-gauge wire and 3,600 ties per charge means you can run through a large pour without constantly reloading wire or swapping batteries. The deep capacity — tying combinations up to the sum-of-17 range — handles what the 18V tools can't.

Concrete contractors on tilt-up and structural jobs. Tilt-up panels have specific engineering requirements for tie spacing and strength. The GRT01's adjustable tie settings let you dial in the tension your engineer specifies, and the 16-gauge wire gives you the holding power those panels demand before they go vertical.

Road and bridge crews. Bridge deck reinforcement and highway concrete involve large-diameter rebar in demanding combinations. The GRT01's full range from wire mesh to #9 x #8 covers most of what you'll encounter in civil infrastructure work.

Pool contractors. Gunite pools require extensive rebar cages, and consistency in tie strength across hundreds of intersections affects how well the cage holds its shape under shotcrete pressure. The six tension settings on the GRT01 let crews standardize across the whole cage rather than relying on individual hand-tying variation.

General concrete and foundation contractors. Residential foundations, commercial slabs, and post-tensioned decks all benefit from faster tying. The 3,600-tie range is especially practical for residential foundations where the rebar grid is extensive but the bar sizes are moderate.

Any job where placing mats and tying 100% is required in the scope.  This tool effectively eliminates the strenuous demand of tying 100%.  Increasing production and reducing potential workers comp concerns for repetitive demanding work.

The XGT® Platform: Why It Matters Beyond This One Tool

The GRT01 runs on Makita's 40V max XGT® platform, which is worth understanding if you're evaluating it as a long-term investment rather than a standalone purchase.

XGT® was designed from scratch as Makita's high-power cordless system. The batteries, chargers, and tools communicate digitally — the battery and tool exchange data in real time to monitor temperature, load, and discharge rate, which protects both the tool and the battery under heavy use. For a tool like a rebar tier that runs continuously for hours, that protection matters.

More practically: XGT® batteries work across an expanding lineup of concrete and construction tools. The same 40V max batteries that run your GRT01 also power the GCS01 rebar cutter, the GMH06 demo hammer, the GRV01 concrete vibrator, and more. For a concrete crew building out a cordless system, every XGT® tool you add shares the battery inventory you've already invested in.

Two configurations are available:

GRT01Z (tool only) — If you're already running XGT® tools on your crew, your existing batteries work here. This is the more economical entry point for crews already invested in the platform.

GRT01D (complete kit) — Includes the tool, two 40V max XGT® 2.5Ah batteries, the rapid optimum charger, four 16-gauge steel tie wire reels, and a tool bag. If you're new to XGT® or need a turnkey solution for a dedicated rebar crew, the kit makes practical sense. The four included wire reels give you enough material to get started on a real job without an immediate trip for consumables.

How It Stacks Up Against the MAX TwinTier

The tool most ironworkers will benchmark the GRT01 against is the MAX TwinTier — the category's longtime standard-bearer with over 30 years on job sites. MAX invented the automatic rebar tier and has been refining it ever since. Before deciding where the GRT01 fits on your crew, it's worth understanding exactly where the TwinTier lineup sits and what it does well.

MAX makes two primary TwinTier models. The RB441T handles rebar combinations from #3 x #3 up to #7 x #7 and delivers up to 5,000 ties per charge. The RB611T is the large-bar version, handling combinations from #5 x #5 up to #9 x #10, also at up to 5,000 ties per charge. Both use MAX's dual 19-gauge wire feeding mechanism — two strands run simultaneously to form the tie — and both are proven, fast, reliable tools.

The TwinTier lineup splits the tying range across two separate tools. If your jobs regularly span both ends of that range — mesh and light bar work on one end, heavy structural on the other — you're either buying two MAX tools or constantly moving one between crews. The GRT01 consolidates that entire range into a single tool, with one battery platform, one wire reel format, and one set of tension settings you dial up or down depending on what you're tying that day.

On tie strength, MAX makes a specific claim: that one wrap of their dual 19-gauge wire equals the strength of a 16-gauge hand snap tie. That's a fair comparison when you're measuring against hand-tying. The GRT01 is a different comparison — it's running actual 16-gauge wire under consistent 40V motor tension with six adjustable tie strength settings, which is why Makita can claim ties up to 65% stronger than previous automatic tiers in this category.

The one area where the MAX RB611T retains an edge is at the absolute top end of the range — it reaches #9 x #10 versus the GRT01's #9 x #8. For the fraction of work that lives in that specific upper corner, the RB611T remains the only automatic option. But for everything else across the full range, from mesh to the sum-of-17, the GRT01 is the only tool that covers it in one piece of equipment with stronger wire.

Fastlane Service: 3-Day Repair Is a Job-Site Promise, Not a Brochure Claim

A rebar tier isn't a tool you put down when it needs service. On active concrete jobs it's running continuously, and a tool sitting in a repair shop for two weeks is a real cost — in rental fees, in labor hours reverting to hand-tying, or in schedule impact.

Makita covers this with their Fastlane Express Service — a complimentary priority repair program that applies specifically to rebar tying tools, including the GRT01. The commitment is 3-business-day turnaround from the time the tool ships. Makita provides the shipping label, repair time begins when the tool leaves a FedEx location, and the program covers the contiguous 48 states.

That last detail matters: Makita sends you the label. You're not coordinating freight, you're not driving to a service center. You drop it at FedEx, and the clock starts. Three business days later it ships back. For a tool in the $2,000–$3,200 range depending on configuration, that level of after-sale support is part of what you're buying.

MAX offers standard warranty service for the TwinTier tools, but there is no equivalent priority program that commits to a defined turnaround window specifically for rebar tiers. When production depends on the tool, that difference in service commitment is worth factoring into the purchase decision.

One Thing to Plan For: The Wire Reels

The GRT01 uses proprietary 16-gauge steel tie wire reels (Makita part number 1915N0-0), sold in a 32-pack case. Each reel yields approximately 245 ties on #3 x #3 rebar — fewer on larger combinations. Budget your consumable cost accordingly when you're pricing jobs.

The tool's easy-load reel design with automatic locking cover makes reel changes fast on the job site — no fumbling with loose wire or manual latching under gloves.

Bottom Line

The GRT01 fills a real gap. Automatic rebar tiers have been a productivity win for ironworkers and concrete crews for years, but they've always been limited to lighter wire and moderate rebar sizes. The GRT01 is the first tool in the category that handles 16-gauge wire, covers the complete range from wire mesh through heavy structural rebar, and backs it all up with a 3-business-day service commitment through Fastlane.

For crews on structural concrete, tilt-up, road and bridge, or any work where tie strength is an engineered specification, this is the first automatic tier that belongs in the spec. For pool contractors and general concrete work, it's a capability upgrade that eliminates the line between what you can auto-tie and what you have to do by hand. And for any crew that's been running two MAX tools to cover the full range, it's a consolidation that pays for itself in equipment that doesn't need to travel between jobs.

Available now at Pacific Power Tools in Orange, CA — walk in or order online at pacificpowertools.com.

Pacific Power Tools is located at 810 W. Katella Ave., Orange, CA. We carry new and factory-reconditioned Makita tools, including the full XGT® platform. Questions? Call us or stop by.