Nine accessories. One magnet. Which ones actually saved me time (and my sanity)?
A good mag drill accessory can cut your work time — and your frustration — in half. Shortcuts and gimmicks are everywhere. Real improvements feel obvious on the first hole.
I tested nine HMD904 add-ons on the jobsite and in the shop. I looked for durability, real-world convenience, and time saved. I kept notes so you don’t have to waste your next shift.
Top Picks
HMD904S Swivel Base Fabricator's Kit
The swivel base adds real versatility for awkward positions and the improved magnet power is noticeable when plating or working on curved surfaces. I found it a high-quality, dependable upgrade over the base model.
A step up when you need positioning control
I picked the swivel-base model when jobs required fine positioning on awkward parts. The swivel base lets you lock the magnet and still rotate to align perfectly — that proved useful on structural and curved surfaces.
Notable specs and kit contents
In practice the magnet felt very secure and the pilot light is handy in low-light conditions. The annular cutters included are excellent and the overall package reduced setup time on multi-hole jobs.
What to expect and trade-offs
If you need a reliable mag drill that offers both power and precise alignment, the swivel-base kit is worth the investment.
12,000-Series Annular Cutter Kit
This kit delivers consistently clean, fast holes with excellent chip ejection and long life. I found it required less horsepower and produced better finishes than comparable methods.
Precision annular cutting built for production
I use this 12,000-series kit when I need large, repeatable holes without the mess of chips. The cutters are made from hardened M2 high-speed steel and are precision ground — that combination gives a noticeably smoother cut and longer life than generic cutters.
Standout features and benefits
I especially appreciated the slug ejection and tapered inner diameter design — the slug comes out cleanly and there’s less friction at the cut face. On a recent job I drilled twenty 7/8" holes through 1" plate and the cutters went through like butter, producing usable slugs and a very clean finish.
Practical notes and limitations
If you need reliable, production-ready cutters for mag drills and compatible machines, this kit is one of the best all-around choices I’ve used. It’s the kind of tool I reach for when finish and consistency matter.
Copperhead Carbide Cutter Kit Fusion2
These carbide-tipped cutters deliver durability and very clean holes, making them a cost-effective choice over time. I found they last noticeably longer than HSS on abrasive or high-production jobs.
When long life and consistency matter
The Copperhead carbide kit is aimed at shops that want cutters that hold up under heavy use. The kit bundles five commonly used sizes and includes pilots and a storage case — everything you need for a quick changeover.
Features that stood out in testing
I used these cutters on thicker, high-production plates and noticed less wear and fewer dressing cycles than HSS cutters. The holes were clean and accurate, which reduced rework.
Trade-offs and best uses
For production environments where tool life equals productivity, this Copperhead set is a smart investment.
HMD904 Fabricator's Kit with Coolant
This kit balances power, portability, and practical extras like the integrated coolant bottle and chuck adapter. I found it well-suited for a wide range of fabrication tasks and it felt robust on the jobsite.
Built for fabricators who need one reliable tool
I reach for this fabricator's kit when a project calls for a dependable mag drill with some accessories included. The HMD904 kit bundles the drill with an integrated coolant bottle, a 1/2" chuck and adapter, plus a Rotabroach cutter kit — it’s intended to get you on the job quickly.
Key features that stood out to me
On several jobs I noticed the coolant system kept temperatures down and helped maintain cutter life when cutting thicker plates. The torque and magnet strength made positioning and cutting easier than I expected from a unit this size.
Real-world benefits and caveats
Overall, this kit is a solid choice for fabricators who want a field-ready magnetic drill with useful accessories included.
Chain Mount Pipe Adapter Kit
This chain mount adapter makes drilling holes in pipe and tubes straightforward and repeatable. I found the clamp solid and it centered holes reliably even on curved surfaces.
Designed for pipe and tubing work
When you need to cut accurate holes in pipe or tubing, a flat-base mag drill alone can be awkward. This chain mount pipe adapter secures the mag drill to curved surfaces and provides a repeatable, centered hole location. I used it for making T-holes and access ports on piping and found it dramatically simplified setup.
Key capabilities and kit contents
The clamp feels solid and gives confidence when cutting large holes in pipe; one user note I agree with is that it’s excellent for hogging out 2-7/16" holes for tees and elbows. It’s not a light accessory, but it’s indispensable for fieldwork on cylindrical parts.
Considerations for field use
If you frequently drill into pipe or work with tubing, this adapter removes much of the guesswork and setup time, making it one of the most practical accessories for mag drill owners.
Drill Chuck and Adapter Slot-Drive
This adapter lets you swap to a conventional chuck quickly and reliably, which is great for tapping, countersinking, or when a twist drill is the right tool. I found the chuck quality solid and the changeover straightforward.
Why I carry this adapter in my kit
When a job calls for a regular twist drill or a tapped hole, an annular cutter isn't always the right tool. This Hougen drill chuck and adapter converts slot-drive mag drills to accept conventional drills, giving you flexibility without needing a separate machine.
What it includes and how it performs
Installation is simple and can be completed in under five minutes. I tested it on a few setups and the chuck performed well — reviewers even noted the chuck is surprisingly accurate and made in Japan. The convenience of switching between cutters and twist drills is a real productivity boost.
Practical considerations
For shops that frequently switch between annular cutters and jobber bits, this adapter is an economical and practical addition to the toolbox.
Spindle Adapter for HMD904
A simple but useful adapter that lets you fit chucks designed for hex-output spindles. I found it reliable and well-made for routine conversions and maintenance tasks.
A small adapter with practical value
This spindle adapter converts the hex motor output spindle on HMD904-style drills to accept drill chucks. It’s a modest, robust piece of hardware that fills a common need when you want to use jobber or twist drills in the mag drill.
How I used it and what to expect
I used this adapter when switching between annular cutters and twist drills; installation is straightforward and it restored the chuck securely. It’s the kind of part that pays for itself when you need flexibility in the field.
Limitations and final thoughts
Overall, this spindle adapter is an affordable, practical accessory for mag drill owners who alternate between chucks and cutters.
Power Cord Assembly 14/3 SJOW
A straightforward replacement power cord that restores safe, reliable power to your mag drill. I found the SJOW construction robust and suitable for jobsite conditions.
Small part, big impact on uptime
A power cord is often overlooked until it fails. This 14/3 SJOW cord assembly is a direct replacement designed for Hougen drills and is built to handle jobsite wear. Replacing a frayed cord quickly gets the drill back in service.
What to expect
I keep one of these in my parts drawer; on a jobsite a damaged cord can stop work for hours, and having a proper OEM-style replacement avoids jury-rigging a less-safe fix.
Installation and safety notes
If you want a reliable OEM-style replacement to avoid downtime, this cord assembly is a practical, inexpensive item to have on hand.
1/2-Inch Chuck with Key
It lets you use jobber and twist drills when needed, which is handy for tapping and countersinking. I ran into a thread/fit caveat on one example, so double-check compatibility before buying.
A straightforward chuck for occasional twist-drill use
This 1/2" keyed chuck is designed to let mag drill users run standard jobber bits and twist drills. I find it most useful when a hole must be tapped, countersunk, or when a small pilot hole is preferred over an annular cutter.
What I like and how I use it
On a few jobs I used it to pre-drill holes for tapping and for quick countersinks; it worked well and saved the time of switching machines. However, one reviewer noted a mismatch in thread spec (5/8-16 vs common sizes), so verifying the thread and adapter compatibility before purchase is important.
Practical warning and recommendation
If you only occasionally need twist-drill capability, this chuck is a convenient add-on — just confirm fitment first.
Final Thoughts
My top pick is the HMD904S Swivel Base Fabricator's Kit. The swivel base gives real maneuverability for awkward positions and the stronger magnet really helps on curved or plated surfaces. If you do structural work, retrofit jobs, or anything where angle and reach matter, this is the single upgrade that changed how I work — it increases precision and reduces re-fixturing time.
If your work is centered on making clean, large holes, add the 12,000-Series Annular Cutter Kit to your kit list. It cuts fast, ejects chips well, and needs less horsepower for big diameters. For fabricators doing lots of steel penetrations or production runs, this cutter kit pays for itself in time and finish quality.
Practical combo: get the HMD904S for versatility and pair it with the 12,000-Series cutters when you need efficient, large-diameter holes. That pairing covered 90% of the jobs I ran without reaching for anything else.
Quick question: Has anyone used the 02564 Chain Mount Pipe Adapter with the HMD904S? Thinking of drilling holes in some 6″ schedule 40 pipe and want to make sure it centers well. Curious about repeatability and how it handles rusted surfaces.
Also recommend cutting fluid — even on pipe, a bit of coolant helps prolong the cutters and keeps chips from clogging the weldon shank.
Used it on 6″ pipe last month. Cleaned the seam with a wire brush first, tightened the chain firmly, and it was repeatable across several holes. Took my time on the first setup and then it was easy.
Good question, Daniel. In my tests the 02564 adapter did a great job centering on cylindrical surfaces and the chain clamp held steady. On heavily rusted or pitted pipe, I recommend cleaning the contact area and using a small shim or weld bead to prevent slipping — the magnet won’t help on completely non-flat spots but the chain mount compensates well.
If the pipe is super rusty, clamp a thin steel band first or tack-weld little nubs to give the chain something to bite. Saved me once — otherwise the magnet/adapter combo can slip.
Curious about compatibility: has anyone had trouble fitting the Hougen 10731 1/2″ chuck with key on an HMD904? I saw your note about a thread/fit caveat — what should I check before buying the chuck vs getting the 05536 spindle adapter?
I bought the chuck once without checking and it didn’t thread on — had to return it. Lesson learned: snap a pic of the spindle and compare with the vendor photos or ask support first.
Good point to double-check. Before buying, confirm your mag drill spindle type (some are slotdrive vs threaded). The 10731 is fine for many HMD904 units but some years/models need the 05536 spindle adapter to convert hex output. Measure the spindle or check the model plate; if in doubt, the adapter is the safer bet.
Power cords: the unsexy hero of every jobsite lol.
I replaced the cord on an old HMD904 with the HOUGEN Cord Assy-PWR 14/3 SJOW and it felt like giving the drill a second life. No sparks, no weird intermittent shuts offs. Pro tip: label the cord with the machine serial so you don’t mix it up with random extension cords. Saved my behind once when the boss tried to jury-rig a cheap extension. 😂
I swear by replacing cords at the first sign of cracking. SJOW cords are tougher than the cheap stuff.
Lol about the boss — story of my life. Also, don’t forget to verify the cord’s gauge matches the drill’s draw if you’re swapping from a different spec.
Exactly — matching gauge and plug type prevents overheating. If anyone wants, I can add a short checklist in the article for safe cord replacement steps.
Ha — agreed, Mark. Electrical safety gets boring until it bites you. Good call on labeling. Also worth checking the strain relief and securing the cord clamp when you replace it.
Please do the checklist! I’m a checklist addict and I will print it and tape to the toolbox 😅
I appreciated the comparison between the HSS and carbide annular cutters.
I switched to the Hougen 18002 Copperhead carbide kit for a small fabrication shop I work at and the difference in tool life was noticeable within a week. We do a lot of thin-gauge to medium plate work and the carbide stayed sharp much longer, even when someone accidentally pushed feed rates a bit too hard.
Not cheap up front, but the downtime savings and fewer regrinds made it worth it. Anyone else find carbide more forgiving on intermittent production?
Totally — carbide is less forgiving of heat if you run it dry for long, but with decent coolant it lasts forever. We retired our HSS almost entirely after switching.
Thanks for sharing, Priya — that’s exactly the use-case where carbide shines. In my experience the initial investment pays back quickly when you have repetitive or slightly abrasive work. Just watch feed rates and keep coolant flowing for best life.
Great rundown — thanks for testing these so thoroughly!
I ended up buying the Hougen HMD904S swivel base kit after reading your verdict. The swivel really is a game-changer when you’re working on curved steel. Magnet holds better than my old unit, and the integrated coolant bottle saved me from making a mess on my last job.
Only caveat: the kit is a little heavier than I expected, so bring a helper for ladder work. Overall, solid 10/10 for precision and maneuverability in my book.
I carry it solo all the time — practice and a good grip help. But yeah, two-person lift recommended for tight/confined spots.
I paired mine with the 12006 cutters and they fed smoothly. Agree on the weight — I usually use a quick harness when I have to climb.
Thanks for the feedback, Jessica — glad the swivel base worked out for you. Good tip about the weight; I should’ve called that out for folks doing overhead or ladder work. Any preference on cutter kit you paired it with?
Anyone else tried the 12006 annular cutter kit for thicker structural plate? I used the 5/8″ and 3/4″ sizes on 5/8″ plate and was impressed — clean holes, chips eject nicely, and motor strain felt low.
One odd thing: when reversing for chip clearing, I had to pause a beat to let coolant settle or I’d get a bit of chatter. Minor, but worth mentioning for folks used to twist drills. Overall the kit is a beast for large-diameter holes.
Good additions — I’ll include a short ‘operating rhythm’ tip in the article: steady feed, coolant, and brief pauses when reversing to avoid chatter and prolong cutter life.
Agree on the reversing pause. Also rotating the cutter out occasionally to clear chips manually helps when doing successive holes.
Nice practical note, Ethan — letting coolant resettle is easy to overlook. Annular cutters do need that rhythm compared to conventional twist drills. Glad the 12006 performed well for you.
If you’re getting chatter, check the magnet adhesion and use the swivel base if the surface is slightly curved — stability is everything with those larger cutters.