Aluminum vs Brass for CNC Machining: Which Stock to Buy
Aluminum and brass stock for CNC machining compared by alloy, form, size, pack count and finish, across four listings.
On this page
Top picks at a glance
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- 1
Roowest 50 Pcs Blank Aluminum Dog Tags for Engraving 38mm9.7/10View on Amazon - 2
4-Pack Solid Brass Rods9.5/10View on Amazon - 3
10-Pack Solid Brass Rods9.5/10View on Amazon - 4
Aluminum Bar 4"（100mm） X4（100mm） X1/2"（12mm）【1Pcs】 AluminumView on Amazon - 5
Fuzqq CNC Positioning Side ClampsView on Amazon - 6
10PCS 5052 Black Anodized Aluminum Sheet 5x7 Inch 0.8mm CNCView on Amazon - 7
LUNYEE Aluminum Tiger Claw ClampView on Amazon - 8
Marspark 300 Pcs Metal Business Cards Aluminum Engraving CardsView on Amazon - 9
2PCS 150mm（5.9 Inches）Tr8x8 Lead Screw with T8 Brass NutView on Amazon
Aluminum vs brass for CNC machining comes down to the part you are making. The two aluminum listings here are flat and structural stock: sheets for plates and brackets, and T-slot extrusion for machine frames. The two brass listings are small round rods for pins, accents and turned parts. Pick the side that matches your stock list, not the metal’s reputation.
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Verdict: pick aluminum for frames, plates and brackets: the TITGGI 2020 extrusion builds machine frames and the Tynulox 6061 sheets suit flat stock. Pick brass for small turned or decorative parts: the LRVOJUY rods come in 1/8 and 1/4 in diameters with a polished finish. Choose by the part, not the metal.
Machines on the list
10 PCS 48" Black 2020 T-Slot Aluminum Extrusion
Ten 48 in black 2020 T-slot aluminum extrusions in 6063-T5, precision cut to plus or minus 0.5 mm, for machine frames and enclosures.
Pros
- Plus or minus 0.5 mm cutting tolerance stated
- 6063-T5 alloy with black anodized finish
- Works with M3, M4, M5 T nuts and 20 Series hardware
- Listed for CNC machines and laser engravers
Cons
- No warranty term stated
- Black only, one color
- 20 Series hardware not included
- 48 in rails may need cutting to fit
5PCS 6061 Aluminum Sheet Metal 1/4" x 4" x 4"
Five 4 by 4 by 1/4 in 6061 aluminum sheets with protective film, weldable and corrosion resistant, 0.86 kg.
Pros
- 6061 alloy, heat treatable
- Weldable, corrosion and oxidation resistant
- Protective film on both sides
- Listed for precision applications and models
Cons
- Brand Tynulox, manufacturer Yirde listed
- Table lists 10.2 cm diameter for a square sheet
- Specification Met listed as False
- No warranty term stated
4-Pack Solid Brass Rods, 1/4 x 12 Inch Brass Rod
Four 1/4 by 12 in solid brass rods with polished finish, for knife handle pins, machining and crafts.
Pros
- 1/4 in diameter for sturdier pins and parts
- Polished, gold-like finish
- Smooth cutting without cracks claimed
- 11.78 oz stated weight
Cons
- Table lists 0.67 in against 1/4 in diameter
- No warranty term stated
- 4 pack, the smallest brass pack
- No weight per rod stated
10-Pack Solid Brass Rods, 1/8 x 12 Inch Brass Rod
Ten 1/8 by 12 in solid brass rods with polished finish, for knife handle pins, machining and crafts.
Pros
- 10 pack, the most pieces here
- 1/8 in diameter for fine pins and details
- Polished, gold-like finish
- Smooth cutting without cracks claimed
Cons
- Table lists 0.67 in against 1/8 in diameter
- No warranty term stated
- No weight stated
- Thin stock for structural parts
Other machines to compare
Aluminum Bar 4"（100mm） X4（100mm） X1/2"（12mm）【1Pcs】 AluminumCheck price on Amazon
Fuzqq CNC Positioning Side ClampsCheck price on Amazon
10PCS 5052 Black Anodized Aluminum Sheet 5x7 Inch 0.8mm CNCCheck price on Amazon
LUNYEE Aluminum Tiger Claw ClampCheck price on Amazon
Marspark 300 Pcs Metal Business Cards Aluminum Engraving CardsCheck price on Amazon
2PCS 150mm（5.9 Inches）Tr8x8 Lead Screw with T8 Brass NutCheck price on Amazon
Side by side
| Spec | TITGGI 2020 T-Slot Rails | Tynulox 6061 Alu Sheets | LRVOJUY 1/4in Brass Rods | LRVOJUY 1/8in Brass Rods |
|---|---|---|---|---|
| HQ Score | 61 | 56 | 54 | 54 |
| Material | 6063-T5 aluminum | 6061 aluminum | Brass | Brass |
| Form | 2020 T-slot extrusion | Sheet, 4 x 4 x 1/4 in | Rod, 1/4 x 12 in | Rod, 1/8 x 12 in |
| Pack | 10 | 5 | 4 | 10 |
| Length | 48 in (1220 mm) | 4 in | 12 in | 12 in |
| Tolerance | ±0.5 mm | Not stated | Not stated | Not stated |
| Finish | Black anodized | Protective film | Polished | Polished |
| Weight | Not stated | 0.86 kg | 11.78 oz | Not stated |
| Warranty | Not stated | Not stated | Not stated | Not stated |
Specifications are manufacturer rated, as published on each listing and collected 23 October 2026.
Aluminum vs brass for CNC machining: material and form
The aluminum side lists two alloys in two forms: 6061 sheet and 6063-T5 extrusion. The brass side lists round rod stock in two diameters from one maker. No listing states a machinability rating or a feeds-and-speeds figure, so compare what is stated: form, size, pack count and finish.
Sizes and tolerances
The TITGGI extrusion is the only listing with a stated tolerance: plus or minus 0.5 mm on 48 in rails. The Tynulox sheets are 4 by 4 by 1/4 in, or 102 by 102 by 6 mm. The brass rods are 12 in long at 1/8 in and 1/4 in diameter, or 3.2 and 6.4 mm. The brass listings’ spec tables give 12 by 0.67 by 0.67 in, which does not match the stated diameters; trust the title and bullets.
What each listing is for
The TITGGI listing names 3D printer frames, CNC machines, laser engravers, workbenches and enclosures, and works with M3, M4 and M5 T nuts and 20 Series hardware. The Tynulox listing names industry, machinery, models, frames and railings, and says the 6061 welds, stamps and cuts. The brass listings name knife handle pins, machining, crafts, model making and furniture accents. See brass vs bronze for laser engraving for how the copper alloys compare on the laser side.
Choose aluminum if
- You are building frames, enclosures or machine structures from T-slot stock.
- You need flat sheet stock for plates, brackets or panels.
- You want the only listing here with a stated cutting tolerance.
Choose brass if
- You are turning pins, accents or small decorative parts on the lathe or mill.
- You want a polished, gold-like finish straight from the stock.
- Your parts fit 1/8 or 1/4 in round stock, 12 in long.
For machine choice, see our diode vs CO2 guide before cutting metal stock on a laser.
Metal chips are sharp and hot. Wear eye protection, keep the work area clear of flammables, ventilate, and never laser PVC or vinyl. See the FDA guidance on laser products.
Project Match
- Machine frames and enclosures: TITGGI 2020 extrusion, 48 in rails with T-slots.
- Plates and brackets: Tynulox 6061 sheets, 4 by 4 by 1/4 in.
- Knife pins and small turned parts: LRVOJUY brass rods, 1/8 or 1/4 in.
- Decorative accents: LRVOJUY brass rods with polished finish.
FAQ: lasers and CNC
Is aluminum or brass easier to CNC machine?
The listings do not state machinability ratings. The brass listings describe smooth cutting without cracks, and the Tynulox listing describes weldability and toughness; neither side gives feeds or speeds.
What aluminum alloys are listed here?
The Tynulox sheets are 6061 and the TITGGI extrusion is 6063-T5. No temper is stated for the sheets beyond the 6061 designation.
What sizes of brass rod are listed?
The LRVOJUY listings offer 1/8 in and 1/4 in diameters, both 12 in long, in packs of 10 and 4. The spec tables list 0.67 in dimensions that do not match; trust the titles.
Can I use the T-slot extrusion for a laser engraver frame?
The TITGGI listing names laser engravers among the uses, along with 3D printers and CNC machines. It works with M3, M4 and M5 T nuts and 20 Series hardware.
Do any of these listings state a warranty?
No. None of the four listings states a warranty term.
Related: brass vs bronze for laser engraving and our diode vs CO2 guide.
