SUPPLYGIANT Supply Giant 1-1/4 Inch Galvanized Pipe, One And Quarter Inch Malleable Steel Pipes Fitting Build DIY Vintage Furniture, 1-1/4" x 48"

I put these 1-1/4-inch galvanized pipes to work in two very different projects—a shallow sand-point well line and a set of garage utility shelves—to see how they’d hold up in real-world use. They’re basic pieces of kit, but basics matter: straightness, thread quality, coating consistency, and tolerance stack-ups make or break both plumbing and DIY builds. Here’s what stood out.

What you actually get

This is a five-pack of 48-inch, 1-1/4-inch nominal galvanized steel pipe with male NPT taper threads on both ends. Each pipe arrived capped with plastic thread protectors. The bundle is heavy; each length weighs a bit under 7 pounds, so expect roughly 35 pounds in total. In my case, the shipment came in two bundles a day apart—worth noting so you don’t assume pieces are missing when part of the order lands first.

Dimensional checks lined up with standard Schedule 40 pipe: 1.660-inch OD, wall thickness consistent with Sch. 40, and overall length right at 48 inches including threads. The galvanizing was uniform on the outside with the typical matte gray finish; the thread crests had bright steel showing (as expected) where they’ve been cut after coating. Interior surfaces had light zinc coating—not mirror-smooth, but free of heavy slag or burrs.

Straightness was very good across all five sticks. Rolling them on a flat surface, the runout was minimal—well within what you’d want for both plumbing and furniture uses.

Thread quality and fitment

Threads make or break the experience with pre-threaded pipe. These are cut to an NPT taper that matched cleanly with 1-1/4-inch malleable iron couplings and valves I already had on hand. With a go/no-go gauge, all the ends I checked seated appropriately. The thread finish isn’t boutique; I found minor nicks on a couple of crests under the protective caps, likely from handling. None of that stopped proper engagement or sealing. If you’re especially picky, a light pass with a thread file or die will dress things up.

For sealing, I used a thin coat of pipe dope with two wraps of PTFE tape over it. In pressure tests up to standard shop air (90 psi) and a domestic cold-water loop, joints sealed without drama. As always with galvanized, don’t overtighten—you’ll get a better seal with proper dope/tape and the correct wrench torque than by muscling it.

Performance in a shallow well application

Driving 1-1/4-inch galvanized pipe for a sand point is a common DIY move, even if these pipes are technically sold for low-pressure plumbing. I did a test drive on sandy soil using a malleable iron coupling, a dedicated drive cap, and a sledge. A few tips from that trial:

• Use a sacrificial short nipple above your drive cap. That short segment will take the brunt of any mushrooming and thread distortion.
• Retighten the drive head and the main coupling every few blows; vibration likes to loosen threaded joints.
• Keep the blows centered. Off-axis hits can kink the top threads and start a bend.

With that approach, the pipes held straight and threaded together reliably as I added sections. After extraction, the sacrificial top nipple showed the majority of thread wear; the full-length pipes were still serviceable for future plumbing work. If you plan to use a jackhammer with a drive coupling, the same sacrificial-piece strategy applies. Don’t expect pristine threads if you plan to pound on them—physics wins—but with proper technique the main pipes can come through in good shape.

If you’re frequently driving wells, consider purpose-made drive pipes or heavy-duty drive couplings to better protect threads. These galvanized lengths can do the job, but they’re not magical.

Use in low-pressure plumbing

These are billed for low-pressure service—water, oil, LP/natural gas, steam, and air—and they’re made to ASTM/ANSI standards. In my shop I plumbed a short run for air with a drop leg, ball valve, and drip leg, then monitored for leaks over a week with soapy water checks and pressure retention. No leaks developed. For domestic water, I inserted one length into an exterior spigot stand-up to test corrosion resistance in a splash zone. After a month in the weather, the zinc coating held fine with no rust bleed.

Know your local code before using galvanized on gas lines. Some jurisdictions prefer or require black steel for gas service. That’s not a materials flaw—just a code point to check.

DIY furniture and fixtures

If you’re building shelves, garment racks, or shop fixtures, these work well, with a few caveats:

• Finish: Galvanized pipe has a utilitarian gray look. If you want the deep black “industrial” aesthetic, you’ll need black steel pipe instead. If you like the gray, I recommend a degrease (mineral spirits), scotch-brite scuff, and a clear matte coat to keep hand oils from dulling the zinc over time.
• Clean threads: Threads were consistent enough that flanges and couplings squared up cleanly. That matters for straight shelf uprights and level crossbars.
• Dimensional consistency: Lengths matched closely enough that pairs lined up without shimming. I measured variation under 1/16-inch across the five pieces.

Load-wise, 1-1/4-inch Schedule 40 is stout. Two uprights with crossbars handled lumber and tool totes without deflection over a 48-inch span when properly anchored.

Durability and corrosion

Galvanized pipe exists for a reason: it buys you time against corrosion, especially in damp or outdoor environments. The coating here is typical of mass-market galvanized steel—no excessive drips, reasonable interior coverage, and clean exterior zinc. If you’re burying pipe, wrap it or sleeve it; buried galvanized will eventually corrode, and soils with high salts or acidity accelerate that. For exposed outdoor projects, a clear coat adds a layer of insurance.

Limitations and cautions

• It’s not high-pressure hardware. Don’t use these in high-pressure steam service or any application that exceeds low-pressure ratings; follow the spec and your local code.
• Threads can deform if you use them as a striking surface. Use a drive cap and sacrificial nipple if you’re pounding.
• Shipping quirks happen. My five arrived in two bundles. Count your pieces and keep the packaging until you’ve verified everything.

Value

Pre-threaded, 48-inch galvanized lengths aren’t cheap to make or ship, and these land at a fair price point for the category, especially considering the five-pack format. If you need a handful for a project, buying as a set is more economical than piecing together singles locally, and the consistency across all five sticks is a plus.

Tips for best results

• Use proper thread sealant: a light dope plus PTFE tape combo works well on galvanized.
• Support and align while threading: start couplings by hand to avoid cross-threading; finish with two wrenches.
• For driven applications: add a drive cap, recheck torque often, use a sacrificial nipple, and keep blows straight.
• Protect the finish: degrease and clear-coat for furniture; wrap for burial.

Pros

• Consistent, straight Schedule 40 pipe with clean NPT threads
• Uniform galvanizing suitable for damp/outdoor environments
• Arrives with protective caps; threads generally in good condition
• Five-pack pricing and consistency are convenient for projects
• Meets ASTM/ANSI specs and seals reliably with standard fittings

Cons

• Threads are vulnerable if you drive them without protection
• Galvanized gray may not suit builds seeking a black “industrial” look
• Shipping may split into multiple bundles; verify counts on arrival

Recommendation

I recommend these 1-1/4-inch galvanized pipes for anyone needing straight, code-compliant Schedule 40 lengths for low-pressure plumbing, shallow well lines (with proper driving technique), shop air runs, or robust DIY fixtures. They’re consistently made, thread cleanly, and the galvanizing offers the corrosion resistance you want outdoors or in damp spaces. Just respect their limitations—use a drive cap and sacrificial nipple if you’re pounding, verify local codes for gas service, and expect the practical gray finish of galvanized steel. Within those bounds, they deliver solid performance and good value.