> ## Content Index > Fetch the complete content index at: https://najimu-japan.com/llms.txt > Use this file to discover other available public pages before exploring further. # Best Heavy Duty Angle Grinder for Site Crews - URL: https://najimu-japan.com/best-heavy-duty-angle-grinder-contractors/ - Published: 2026-09-07T07:10:42.000Z - Updated: 2026-09-07T09:49:22.000Z - Description: A ranked shortlist of seven corded angle grinders, sorted by disc size, amperage and weight, with the trade-offs each one makes on a working site. - Author: Jo Lowery - Tags: Kitchen & Dining, Power Tools, Grinders The best heavy duty angle grinder for contractors is the DEWALT DWE402, an 11 amp 4.5-inch corded tool that spins at 11,000 rpm and still comes in at 6 lb with a 3-year limited warranty. If you spend more time cutting thick steel than trimming rebar, step up to the 7-inch DEWALT DW840, which pushes 13 amps at 8,000 rpm and takes a bigger wheel for deeper passes. Pick the disc size first, then the amperage that feeds it. In this guide 1. [Best heavy duty angle grinder for contractors at a glance](#best-heavy-duty-angle-grinder-for-contractors-at-a-glance) 2. [How the shortlist was built](#how-the-shortlist-was-built) 3. [1\. DEWALT DWE402 — Best overall](#1-dewalt-dwe402-%E2%80%94-best-overall) 4. [2\. DEWALT DW840 — Best for heavy use](#2-dewalt-dw840-%E2%80%94-best-for-heavy-use) 5. [3\. Makita GA7021 — Best premium](#3-makita-ga7021-%E2%80%94-best-premium) 6. [4\. Bosch GWS8-45 — Most versatile](#4-bosch-gws8-45-%E2%80%94-most-versatile) 7. [5\. Metabo HPT G12SR4 — Best lightweight](#5-metabo-hpt-g12sr4-%E2%80%94-best-lightweight) 8. [6\. AOBEN AT3113X — Best for families](#6-aoben-at3113x-%E2%80%94-best-for-families) 9. [7\. AVID POWER AAG589 — Best budget pick](#7-avid-power-aag589-%E2%80%94-best-budget-pick) 10. [4.5-inch or 7-inch: which disc size wins?](#45-inch-or-7-inch-which-disc-size-wins) 11. [Amps, RPM and the weight you carry all day](#amps-rpm-and-the-weight-you-carry-all-day) 12. [What the listings do not tell you about contractor use](#what-the-listings-do-not-tell-you-about-contractor-use) 13. [How do the two DEWALTs compare head to head?](#how-do-the-two-dewalts-compare-head-to-head) 14. [What to check on the listing before you buy](#what-to-check-on-the-listing-before-you-buy) 15. [The verdict](#the-verdict) 16. [FAQ](#faq) ## Best heavy duty angle grinder for contractors at a glance | Pick | Disc & amps | Weight | Price | | ------------------------------------------------------------------------------------------------ | --------------------------- | ---------- | ---------------------------------------------------------------------- | | **Best overall**[DEWALT DWE402](https://www.amazon.com/dp/B00RVZ7DNO?tag=najimujapan-20) | 4.5 in / 11 A / 11,000 rpm | 6 lb | [Check Price](https://www.amazon.com/dp/B00RVZ7DNO?tag=najimujapan-20) | | **Best for heavy use**[DEWALT DW840](https://www.amazon.com/dp/B0002SRK6M?tag=najimujapan-20) | 7 in / 13 A / 8,000 rpm | 12.1 lb | [Check Price](https://www.amazon.com/dp/B0002SRK6M?tag=najimujapan-20) | | **Best premium**[Makita GA7021](https://www.amazon.com/dp/B000I6QWQM?tag=najimujapan-20) | 7 in / 15 A / 6,600 rpm | 15.4 lb | [Check Price](https://www.amazon.com/dp/B000I6QWQM?tag=najimujapan-20) | | **Most versatile**[Bosch GWS8-45](https://www.amazon.com/dp/B01HD4EH4A?tag=najimujapan-20) | 4.5 in / 7.5 A / 11,000 rpm | 4.2 lb | [Check Price](https://www.amazon.com/dp/B01HD4EH4A?tag=najimujapan-20) | | **Best lightweight**[Metabo HPT G12SR4](https://www.amazon.com/dp/B07L21GNHL?tag=najimujapan-20) | 4.5 in / 6.2 A / 980W claim | 4 lb | [Check Price](https://www.amazon.com/dp/B07L21GNHL?tag=najimujapan-20) | | **Best for families**[AOBEN AT3113X](https://www.amazon.com/dp/B0GK7LQ1FP?tag=najimujapan-20) | 4.5 in / 10 A / 11,000 rpm | not listed | [Check Price](https://www.amazon.com/dp/B0GK7LQ1FP?tag=najimujapan-20) | | **Best budget pick**[AVID POWER AAG589](https://www.amazon.com/dp/B07P5D6M4V?tag=najimujapan-20) | 4.5 in / 7.5 A / 12,000 rpm | 5.07 lb | [Check Price](https://www.amazon.com/dp/B07P5D6M4V?tag=najimujapan-20) | ## How the shortlist was built I started with roughly forty corded angle grinder listings in the Angle Grinders subcategory and worked down. Cordless models were cut first, because a contractor asking about heavy duty use is usually the one wearing through carbon brushes on a corded tool, not swapping batteries. Then I sorted by three things: the amperage of the motor, the disc size, and whether the listing published a real weight in pounds. Anything without a weight figure got flagged, because that number decides whether the grinder lives in your hand or on a bench. Three criteria carried the most weight in the final ranking, in this order: 1. **Amperage and disc size together.** An 11 amp motor on a 4.5-inch wheel is a different tool than 11 amps on a 7-inch wheel. 2. **Weight relative to that disc.** Heavy is fine if the wheel earns it. Heavy on a 4.5-inch grinder is a mistake. 3. **Published warranty length**, because that is the one contractor-relevant fact the seller commits to in writing. Only two picks in the set publish a warranty over one year: the DEWALT DWE402 at 3 years, and the DEWALT DW840 as a manufacturer warranty without a stated length. That gap did more to sort the winners than any feature bullet. A quick word on the keyword. Amazon's search returns "heavy duty" grinders for the phrase "for contractors", but the listings themselves do not certify who the tool is for. Treat "contractor grade" as a shopping question, not a spec you can look up: check the amps, the warranty and the disc size, and judge each listing on those. ## 1\. DEWALT DWE402 — Best overall **The DWE402 is the best heavy duty angle grinder for contractors who need one 4.5-inch tool that handles daily mixed work without turning into a two-handed weight.** [![DEWALT DWE402 angle grinder with paddle switch — the 11 amp, 6 lb build that wins on power-to-weight](https://m.media-amazon.com/images/I/31ddsoQMU6L._SL500_.jpg)](https://www.amazon.com/dp/B00RVZ7DNO?tag=najimujapan-20) **Best for:** a general contractor who wants one grinder for mixed daily work **Skip it if:** you spend most of the day cutting 7-inch discs into steel The number that matters here is the ratio between amperage and weight. The DWE402 pulls 11 amps at 11,000 rpm and weighs 6 lb, which is more amperage per pound than any other 4.5-inch grinder in this set. The Bosch GWS8-45 hits the same rpm at 4.2 lb, but only draws 7.5 amps, so it gives up torque under load. DEWALT says the dust ejection system pushes debris out of the motor housing, that oversized brushes double the life of the previous D28402 model, and that a one-touch guard rotates through 360 degrees without tools. Those are the manufacturer's claims, and worth naming because brush life and guard adjustment are the two things that kill grinders on a jobsite. The 3-year limited warranty is the longest in this shortlist by a wide margin, and it is the reason this pick wins over the lighter Bosch. The trade-off is that at 4.5 inches, the disc caps how deep you can cut in one pass. If you need to slice through 2-inch stock, look at the DW840 instead. **Pros:** - 11 amps at 11,000 rpm in a 6 lb body - 3-year limited warranty, longest in this set - Paddle switch drops power the moment you let go - Tool-free quick-change wheel release claimed - 360-degree one-touch guard rotation claimed **Cons:** - 4.5-inch disc limits depth of cut on thick stock - Premium price position for the set - Only one seller lists it, so no competing offers [Check Price on Amazon](https://www.amazon.com/dp/B00RVZ7DNO?tag=najimujapan-20) ## 2\. DEWALT DW840 — Best for heavy use **The DW840 trades weight for wheel size, and if you run a 7-inch disc every day it is the smarter buy.** [![DEWALT DW840 7-inch angle grinder in black and yellow — 13 amps and 12.1 lb for demanding metal work](https://m.media-amazon.com/images/I/31fmUWPyrWL._SL500_.jpg)](https://www.amazon.com/dp/B0002SRK6M?tag=najimujapan-20) **Best for:** steel fabricators and demo crews running 7-inch wheels **Skip it if:** you need to work overhead or in tight framing This is the tool for the crew whose day involves cutting flat bar, angle iron, or rebar in stock lengths. The 7-inch disc lets you cut deeper in one pass than any 4.5-inch grinder in this set, and the 13 amp motor at 8,000 rpm is sized for that wheel. Weight is 12.1 lb, twice the DWE402, which is exactly what you expect from a bigger grinder and exactly why it is not your everyday tool. DEWALT lists sealed bearings, external brush caps for field service, and a spindle lock for single-wrench wheel changes. The keyless guard is meant to steer sparks away from the operator, which matters more at this disc size. Compared to the Makita GA7021, the DW840 is 3.3 lb lighter and pulls 2 fewer amps, so it gives up some raw grinding power in exchange for being carried around a site rather than parked on a bench. The warranty is described as "manufacturer" without a stated length, which is the weakest part of the listing. **Pros:** - 7-inch disc for deeper single-pass cuts - 13 amps at 8,000 rpm - External brush caps for field servicing claimed - Spindle lock for single-wrench wheel changes - Lighter than the Makita GA7021 by 3.3 lb **Cons:** - 12.1 lb is heavy for overhead work - Warranty length not stated on the listing - Most expensive corded pick after the Makita [Check Price on Amazon](https://www.amazon.com/dp/B0002SRK6M?tag=najimujapan-20) ## 3\. Makita GA7021 — Best premium **The GA7021 is the strongest 7-inch grinder in this set on paper, and the heaviest tool to carry.** [![Makita GA7021 7-inch angle grinder in teal — 15 amp motor and rear trigger switch with lock-on](https://m.media-amazon.com/images/I/41gUENiSOrL._SL500_.jpg)](https://www.amazon.com/dp/B000I6QWQM?tag=najimujapan-20) **Best for:** a shop grinder that stays on a bench or cart **Skip it if:** you carry the tool up ladders Makita rates the GA7021 at 15 amps and 6,600 rpm on a 7-inch wheel, which is the highest amperage in this shortlist. The weight is 15.4 lb, also the highest, and the dimensions run 7 x 21.3 x 9.25 in. That combination points to shop use, not roof work. Makita says the rear trigger has a lock-on for long runs, which is a shop feature, not a jobsite one: on a moving site you want the switch to drop power the second your hand comes off it. The rubberized grip and rubber tool rest to protect the work piece both read as bench-friendly touches. The tool-less wheel guard is standard on this grade. The trade-offs versus the DW840 are real. You get 2 more amps of motor and lose 3.3 lb of portability, and the warranty drops from unstated DEWALT coverage to a stated 1-year limited from Makita. If the grinder never leaves the shop, that swap makes sense; if it rides in a truck, it does not. **Pros:** - 15 amp motor, the highest in this set - 7-inch wheel for deeper cuts - Rubberized soft grip claimed for long sessions - Lock-on rear trigger for continuous grinding - Rubber tool rest protects the work piece claimed **Cons:** - 15.4 lb, heaviest tool in the shortlist - Lock-on switch is a hazard in overhead or mobile work - 1-year warranty is short for the price position - Most expensive of the seven [Check Price on Amazon](https://www.amazon.com/dp/B000I6QWQM?tag=najimujapan-20) ## 4\. Bosch GWS8-45 — Most versatile **The GWS8-45 is the light 4.5-inch grinder finish trades reach for when they need control, not raw power.** [![Bosch GWS8-45 slim-body 4.5-inch angle grinder — 4.2 lb with two-position side handle](https://m.media-amazon.com/images/I/31gA3igwhuL._SL500_.jpg)](https://www.amazon.com/dp/B01HD4EH4A?tag=najimujapan-20) **Best for:** punch-list work and finish trades that need a light 4.5-inch **Skip it if:** you grind heavy stock all day At 4.2 lb, the Bosch is the second-lightest tool in the set, edged out only by the Metabo HPT at 4 lb. It runs 7.5 amps at 11,000 rpm, which is the same rpm as the DWE402 but at less than three-quarters the amperage. That gap shows up when the wheel bogs down under real pressure: the Bosch will slow before the DEWALT does. Bosch calls out a slim-grip body, a two-position side handle, and directed air flow that diverts dust away from motor components. Those are useful in cabinet interiors, mechanical rooms, and any space where the grinder has to fit past framing or ductwork. The warranty field on the listing simply reads "Warranty" without a stated length, which is the least useful phrasing possible. Compared to the DWE402, you save weight and lose amperage and warranty coverage. Compared to the Metabo, you gain rpm and lose grinding wheels in the box. For a light-duty second grinder on a mixed-trade truck, that trade-off works. **Pros:** - 4.2 lb, second-lightest in the set - 11,000 rpm on a 7.5 amp motor - Slim-grip body for tight spaces - Two-position side handle for left or right hand - Directed air flow claimed to protect motor **Cons:** - 7.5 amps is low against the 11-amp DEWALT - Warranty length not stated on the listing - No included accessories, wheels sold separately [Check Price on Amazon](https://www.amazon.com/dp/B01HD4EH4A?tag=najimujapan-20) ## 5\. Metabo HPT G12SR4 — Best lightweight **At 4 lb with five grinding wheels and a hard case included, the G12SR4 is the easiest kit to pick up and use today.** [![Metabo HPT G12SR4 4.5-inch angle grinder in green and black with hard case and wheels — the 4 lb kit](https://m.media-amazon.com/images/I/5199mmz0eBS._SL500_.jpg)](https://www.amazon.com/dp/B07L21GNHL?tag=najimujapan-20) **Best for:** overhead grinding and tight cabinet or stud-bay work **Skip it if:** you need a paddle switch or a long spindle life under abuse The G12SR4 is the lightest tool in this shortlist at 4 lb, and it is the only pick that ships with grinding wheels and a hard case in the box. That kit matters if the grinder is a second tool you use monthly rather than a daily driver. Metabo HPT rates the motor at 6.2 amps and 980W of max output, which is the lowest amperage figure in the set. The listing notes a left-mounted slide switch with a quick-off feature, a spindle lock for wheel changes, and a removable side handle canted forward for right- and left-handed users. The 2 x 10.2 x 4.5 in body is genuinely small, which is why it wins the overhead and stud-bay work no bigger grinder can reach. The 1-year warranty is short. The 6.2 amp motor will bog on thick steel long before the DEWALT DWE402 will, so if the grinder sees hard use every day, the weight advantage does not make up for the power gap. **Pros:** - 4 lb, the lightest in this shortlist - Five grinding wheels and hard case included - Compact 2 x 10.2 x 4.5 in body - Slide switch with quick-off feature claimed - Removable, forward-canted side handle for either hand **Cons:** - 6.2 amps is the lowest in the set - 1-year warranty - Slide switch, not a paddle [Check Price on Amazon](https://www.amazon.com/dp/B07L21GNHL?tag=najimujapan-20) ## 6\. AOBEN AT3113X — Best for families **AOBEN publishes 10 amps at 11,000 rpm with six speed settings, which is a strong entry-tier spec sheet on paper.** [![AOBEN AT3113X 4.5-inch angle grinder with 6-speed dial — entry-tier tool with high stated amperage](https://m.media-amazon.com/images/I/51ZSaQAFniL._SL500_.jpg)](https://www.amazon.com/dp/B0GK7LQ1FP?tag=najimujapan-20) **Best for:** a homeowner or side-job kit that needs speed control **Skip it if:** you rely on a published warranty and support network AOBEN's numbers put this grinder close to the DEWALT DWE402 on paper: a 10 amp motor at 11,000 rpm on a 4.5-inch wheel, with a 6-speed dial the DEWALT does not have. Variable speed is genuinely useful for polishing and for cutting thin sheet without walking the wheel. The listing also names a 7/8-inch arbor and a 5/8"-11 spindle, which is the standard fit that lets you use most disc brands. That is where the confidence ends. The listing does not publish a weight, does not publish a warranty length, and the specs section shows a count of 19 that reads more like a bundle indicator than a real product detail. AOBEN's brand support in the U.S. is not on the same footing as DEWALT, Makita or Bosch. If this grinder fails a month in, you are on your own with the seller. Treat it as a kit for occasional home projects or a lightly-used second tool, not the primary grinder for a working crew. **Pros:** - 10 amps at 11,000 rpm claimed - Six-speed dial for polishing and thin cuts - Standard 7/8-inch arbor with 5/8"-11 spindle - Spindle lock for quick wheel changes - Entry-tier price position **Cons:** - No weight, dimensions or warranty published - Off-brand support relative to the majors - No paddle switch, uses a switch lock [Check Price on Amazon](https://www.amazon.com/dp/B0GK7LQ1FP?tag=najimujapan-20) ## 7\. AVID POWER AAG589 — Best budget pick **The AAG589 is the cheapest pick here and the fastest on paper, and it earns its place as a truck-bed spare.** [![AVID POWER AAG589 red 4.5-inch angle grinder with auxiliary handle — the budget truck-bed spare](https://m.media-amazon.com/images/I/41yewM6WSuL._SL500_.jpg)](https://www.amazon.com/dp/B07P5D6M4V?tag=najimujapan-20) **Best for:** a backup grinder that lives in the truck for occasional use **Skip it if:** this is the only grinder on a full-time crew AVID POWER rates the motor at 7.5 amps and 12,000 rpm, which is the highest rpm figure in this shortlist, and the tool weighs 5.07 lb. That puts it between the Bosch and the DEWALT DWE402 on weight, with less amperage than either. The listing calls out a tool-free adjustable safety guard, a 2-position side handle, a standard 7/8-inch arbor with a 5/8"-11 threaded spindle, and includes grinding, cutting and flap discs plus the auxiliary handle in the box. That is a lot of kit at the cheapest price in this shortlist. What the listing does not include is a stated warranty, and AVID POWER's category ranking is the highest in this set, which tells you the tool sells fast without telling you anything about how long it lasts. Treat it as a spare grinder, not the primary tool. If you are running one grinder for a two-person crew all week, spend up to the DEWALT and take the 3-year warranty. **Pros:** - 12,000 rpm, highest claimed in this set - Grinding, cutting and flap discs included - Standard 7/8-inch arbor and 5/8"-11 spindle - Tool-free adjustable safety guard claimed - Cheapest price position of the seven **Cons:** - No warranty stated on the listing - 7.5 amps against the winner's 11 amps - Off-brand relative to DEWALT, Makita, Bosch [Check Price on Amazon](https://www.amazon.com/dp/B07P5D6M4V?tag=najimujapan-20) ## 4.5-inch or 7-inch: which disc size wins? The disc size question is the one most contractor shoppers get wrong, and it decides more of your daily comfort than the amperage number does. A 4.5-inch grinder is easier to hold at chest height, easier to work into a stud bay, and takes cheaper wheels. A 7-inch grinder cuts deeper in one pass and grinds a wider face flat faster. Both are heavy duty. Neither replaces the other. Here is the cutoff. If more than half your daily grinding involves stock thicker than the depth a 4.5-inch wheel can cut in one pass, you want the 7-inch. That means the DEWALT DW840 at 12.1 lb or the Makita GA7021 at 15.4 lb. If less than half of your day is thick stock, buy the 4.5-inch and rent or borrow a 7-inch for the days you need it. The DEWALT DWE402 at 6 lb and 11 amps is the right default 4.5-inch for a full-time crew. Two picks straddle the middle by trying to be light 4.5-inch grinders with real power: the Bosch GWS8-45 at 4.2 lb and 7.5 amps, and the Metabo HPT G12SR4 at 4 lb and 6.2 amps. Neither replaces an 11 amp 4.5-inch. Both are useful as second grinders on a truck. ## Amps, RPM and the weight you carry all day The specification triangle for an angle grinder is amperage, rpm, and weight, and buyers routinely read the first two while ignoring the third. That is a mistake. A 15 amp 7-inch grinder held overhead for a two-minute weld cleanup feels heavier than the same tool used on a bench for an hour, because your shoulder is what fails first. Here is how the seven picks line up on the numbers that were actually published: - Highest amperage: Makita GA7021 at 15 amps - Highest rpm claimed: AVID POWER AAG589 at 12,000 rpm - Lowest weight: Metabo HPT G12SR4 at 4 lb - Heaviest: Makita GA7021 at 15.4 lb - Longest published warranty: DEWALT DWE402 at 3 years The DWE402 wins overall because it takes second place or better on every measure that matters, and first place on the warranty and on power-to-weight in the 4.5-inch class. The Makita wins on raw amps and loses on weight by a wide margin. The AVID POWER wins on rpm on the spec sheet and loses on brand support and warranty transparency. Read the numbers together, not one at a time. ## What the listings do not tell you about contractor use Product listings on Amazon are optimised for the checkbox reader, and there are three things about a working grinder that no listing publishes. 1. **Brush life under continuous cuts.** DEWALT and Makita both claim brush-life improvements or field-serviceable brushes, but no listing prints a runtime figure. Ask the tool rep or check the manual before buying if this matters to you. 2. **Real cord length and gauge.** Every pick here is corded. The listing rarely says how long the cord is or what gauge, which decides whether you can reach across a shop bay without a 12-gauge extension. 3. **Guard tightness after a year.** Every pick claims a tool-free or one-touch guard. None of them tell you whether the guard still holds position after twelve months of vibration. Warranty length is your only proxy, and the DEWALT DWE402's 3-year term is why it wins on this axis. You can also check the offer count on the listing. Six of the seven picks here have only one or two sellers, which is normal for tools and means you are buying from a single supply chain. If the listing drops to zero sellers, availability disappears overnight. ## How do the two DEWALTs compare head to head? This is the head-to-head that decides the most orders in this category, because both are corded DEWALT grinders with strong published specs, and the naming does not make the difference obvious. The DWE402 is a 4.5-inch grinder at 11 amps and 11,000 rpm, weighing 6 lb, with a 3-year limited warranty and a paddle switch. The DW840 is a 7-inch grinder at 13 amps and 8,000 rpm, weighing 12.1 lb, with an unstated manufacturer warranty and a tool-free keyless guard. The DW840 has 2 more amps of motor and takes a wheel that is 2.5 inches larger in diameter. It weighs almost exactly twice as much. Pick the DWE402 if your work is mixed and most cuts are within the depth a 4.5-inch wheel can reach in one pass. Pick the DW840 if your daily work involves stock the smaller wheel cannot cut through cleanly, or if you regularly grind wide flat surfaces. There is no in-between. The two tools are complementary, not competitors, and a working crew often owns both. ## What to check on the listing before you buy Before you click through on any of these, run this list against the live page. It takes 90 seconds and it catches most of the misses. - **Amperage** on the motor, and whether the listing says amps or watts. Watts alone is a foreign-market spec. - **Disc size** in inches, matching the wheels you already own. - **Weight** in pounds, published on the specifications tab, not just implied in a bullet. - **Warranty length** in years, not the word "warranty" on its own. - **Arbor and spindle size**: 7/8-inch arbor with a 5/8"-11 spindle is the standard fit. - **Switch type**: paddle switch drops power the moment you release it, slide switches and lock-on triggers do not. - **Included accessories**: whether wheels, a guard, a side handle and a case are in the box. Two of the seven picks here fall short on the warranty check. Two more fall short on the weight check. The DEWALT DWE402 is the only pick that passes every line on this list, which is why it wins. ## The verdict The best heavy duty angle grinder for contractors is the DEWALT DWE402\. It runs 11 amps at 11,000 rpm on a 4.5-inch wheel, weighs 6 lb, and carries a 3-year limited warranty, the longest published in this shortlist. Nothing else in the set matches that combination of power-to-weight and warranty. Two conditions flip the recommendation. If your daily work is thick stock, cutting or grinding steel above the depth a 4.5-inch disc can reach in one pass, buy the DEWALT DW840 at 7 inches, 13 amps and 12.1 lb. If your grinder never leaves the shop and you want the highest published amperage regardless of weight, the Makita GA7021 at 15 amps and 15.4 lb is the pick. The runner-up on the main track is the Bosch GWS8-45, which trades DEWALT's amperage and warranty for a 4.2 lb body that fits into places the DWE402 will not. That is a real advantage for finish trades and mechanical work, but not enough to move it ahead of the DEWALT for the general contractor buying one grinder. ## FAQ ### Is the DEWALT DWE402 worth it for daily contractor use? The DEWALT DWE402 is worth it for daily contractor use because it publishes the longest warranty in this shortlist at 3 years, the best power-to-weight in the 4.5-inch class at 11 amps and 6 lb, and a paddle switch that drops power the moment your hand comes off it. Those three facts together make it the right default for a working crew. ### What amp rating counts as heavy duty on a corded angle grinder? The amp rating that counts as heavy duty depends on disc size. On a 4.5-inch grinder, 10 amps and up is heavy duty territory, which puts the DEWALT DWE402 at 11 amps and the AOBEN AT3113X at 10 amps in class. On a 7-inch grinder, 13 amps is a working minimum, which the DEWALT DW840 meets and the Makita GA7021 exceeds at 15 amps. ### DEWALT DWE402 or DEWALT DW840, which should a general contractor buy? DEWALT DWE402 or DW840 comes down to disc size. Buy the DWE402 if most of your daily cuts are within the depth a 4.5-inch wheel can reach in one pass, since it weighs 6 lb against 12.1 lb. Buy the DW840 if you routinely cut thick steel stock or grind wide flat faces, because the 7-inch wheel does that faster. Many crews own both. ### Are budget angle grinders like the AVID POWER safe for contractor work? Budget angle grinders like the AVID POWER AAG589 are safe when used with the guard fitted and the correct disc, but "safe" and "durable enough for daily use" are different questions. The AAG589 does not publish a warranty length, which is the weakest point of the listing. Treat it as a truck-bed spare, not the primary grinder for a full-time crew. ### What is the trade-off between a 4.5-inch and 7-inch angle grinder? The trade-off between a 4.5-inch and 7-inch angle grinder is weight against depth of cut. The DEWALT DWE402 at 4.5 inches weighs 6 lb; the DEWALT DW840 at 7 inches weighs 12.1 lb. The bigger wheel cuts deeper in one pass and grinds wider faces faster, but the smaller grinder is easier to hold overhead, in stud bays, and above your head for a full workday. If you buy one grinder this month, buy the DEWALT DWE402 and pair it with a fresh box of 4.5-inch cutting and grinding discs in the arbor size the listing publishes. That combination handles most of what a general contractor throws at a grinder, and the 3-year warranty means the tool outlives the first set of brushes without an argument. Add a 7-inch DEWALT DW840 when the day comes that you are running out of wheel on thicker stock. The winner here is not the flashiest spec sheet in the set. It is the one that publishes the numbers you can hold the manufacturer to, and backs them with a warranty long enough to matter on a jobsite. *Last updated: September 20, 2026\. Product availability re-checked.* *This page contains affiliate links. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.*