Aluminium Standoff Spacers ID M2.1mm - 3.1mm Anodised Stand Off Collar Spacer Bush - HomeDIYer
Aluminium Standoff Spacers ID M2.1mm - 3.1mm Anodised Stand Off Collar Spacer Bush - HomeDIYer
Aluminium Standoff Spacers ID M2.1mm - 3.1mm Anodised Stand Off Collar Spacer Bush - HomeDIYer
Aluminium Standoff Spacers ID M2.1mm - 3.1mm Anodised Stand Off Collar Spacer Bush - HomeDIYer
Aluminium Standoff Spacers ID M2.1mm - 3.1mm Anodised Stand Off Collar Spacer Bush - HomeDIYer
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Aluminium Standoff Spacers ID M2.1mm - 3.1mm Anodised Stand Off Collar Spacer Bush - HomeDIYerAluminium Standoff Spacers ID M2.1mm - 3.1mm Anodised Stand Off Collar Spacer Bush - HomeDIYerAluminium Standoff Spacers ID M2.1mm - 3.1mm Anodised Stand Off Collar Spacer Bush - HomeDIYerAluminium Standoff Spacers ID M2.1mm - 3.1mm Anodised Stand Off Collar Spacer Bush - HomeDIYerAluminium Standoff Spacers ID M2.1mm - 3.1mm Anodised Stand Off Collar Spacer Bush - HomeDIYer

Anodized Aluminum Standoff Spacers – ID 2.1/2.6/3.1mm, OD 4/5/6mm, 4 Colors

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Price:
$3.76 USD
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In stock (1000 units), ready to be shipped

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Description

Anodized Aluminum Standoff Spacers — ID 2.1/2.6/3.1mm, OD 4/5/6mm, Yellow / Blue / Black / Red

Standard natural-finish aluminum standoff spacers blend into the background of any build — a missed opportunity in FPV drone frames, RC model assemblies, and DIY electronics projects where a bold color-coded or color-matched standoff can make the build look intentional and professional while also making it easier to identify different standoff heights at a glance during assembly and maintenance. These anodized aluminum standoff spacers combine a lightweight aluminum alloy body with a vibrant anodized color finish, available in three inner diameter series (ID 2.1mm × OD 4mm for M2 bolts, ID 2.6mm × OD 5mm for M2.5 bolts, ID 3.1mm × OD 6mm for M3 bolts) across four anodized colors (Yellow, Blue, Black, Red) and lengths from 2mm to 15mm.

Each standoff spacer is machined from high-strength aluminum alloy with an anodized surface treatment for excellent corrosion resistance and oxidation resistance. The unthreaded (smooth bore) design means these spacers function as pure standoffs, collars, bushings, or spacer washers — sliding over a bolt or screw shank to set a precise gap between two surfaces, acting as a connecting rod, tie rod, or support column between stacked boards, panels, or frame layers. Tolerance: ±0.3mm. Dimension notation: ID (Inner Diameter) × OD (Outer Diameter) × L (Length).

These anodized aluminum standoff spacers are widely used in FPV drone frame stacking, RC model vehicle and airplane chassis assembly, aviation model toy accessories, motherboard and PCB bracket mounting, home computer case builds, TV bracket assembly, office machinery, telecommunications equipment, consumer electronics enclosures, and audio-visual equipment assembly — anywhere a lightweight, color-matched, corrosion-resistant standoff spacer is needed to set a fixed gap or provide a smooth bearing surface between two components.

✅ M2 series: ID 2.1mm × OD 4mm, length 2–12mm. M2.5 series: ID 2.6mm × OD 5mm, length 2–12mm. M3 series: ID 3.1mm × OD 6mm, length 2–15mm. Anodized finish in Yellow, Blue, Black, and Red. Tolerance: ±0.3mm. Select your Color and Dimensions (ID × OD × Length) from the variant options above.

✅ Key Features of These Anodized Aluminum Standoff Spacers

  • 🎨 4 Anodized Colors — Yellow, Blue, Black, Red: Available in Yellow, Blue, Black, and Red anodized finishes to color-match your FPV drone frame, RC model chassis, computer case, or DIY build, or to color-code different standoff heights for quick visual identification during assembly and maintenance. The anodized finish is integrated into the aluminum surface for a hard, color-fast layer that resists fading and chipping under normal use conditions.
  • 📐 3 Inner Diameter Series — ID 2.1mm (M2), ID 2.6mm (M2.5), ID 3.1mm (M3): The ID 2.1mm × OD 4mm series fits M2 metric bolts and screws. The ID 2.6mm × OD 5mm series fits M2.5 metric bolts and screws. The ID 3.1mm × OD 6mm series fits M3 metric bolts and screws. All three series are available in the same four anodized colors for consistent color-matched appearance across mixed M2/M2.5/M3 fastener assemblies.
  • 🔧 Unthreaded (Smooth Bore) Design — Standoff, Collar, Bushing, or Spacer Washer Function: The smooth, unthreaded inner bore allows these spacers to slide freely over a bolt or screw shank, functioning as a pure standoff (gap setter between two surfaces), collar (shaft locator), bushing (smooth bearing surface), or spacer washer (load distributor). No thread compatibility concerns — compatible with any bolt or screw of the appropriate shank diameter.
  • ⚡ High-Strength Aluminum Alloy — Lightweight, Non-Magnetic, Corrosion Resistant: Machined from high-strength heat-treatable aluminum alloy with good mechanical performance, good wear resistance, and good corrosion and oxidation resistance. Significantly lighter than steel or brass spacers of the same dimensions and non-magnetic, making these spacers ideal for weight-sensitive FPV drone, RC aircraft, and electronics enclosure builds.
  • 🔬 Wide Length Range — 2mm to 15mm Across All Three Series: The M2 and M2.5 series are available in lengths from 2mm to 12mm. The M3 series is available in lengths from 2mm to 15mm. This wide length range covers the most common standoff height requirements in FPV drone frame stacking, PCB mounting, and general DIY precision builds without needing to stack multiple shorter spacers.
  • 📦 ±0.3mm Precision Tolerance — Consistent Fit Across All Sizes and Colors: Manufactured with ±0.3mm tolerance for consistent inner bore, outer diameter, and length dimensions across all available size and color combinations. Good usability and easy to install — simply slide over the bolt or screw shank and position between the two surfaces to be spaced.

🎯 Who Is This For?

🚁 FPV Drone & RC Model Builders

Ideal for FPV drone frame stacking, motor mount standoffs, and RC model vehicle and airplane chassis assembly where lightweight, color-coded anodized aluminum standoff spacers provide a precise gap between frame layers and electronics stacks, with Yellow, Blue, Black, and Red color options to color-match or color-code the build across M2, M2.5, and M3 bolt sizes.

🖥️ PCB, Motherboard & Computer Case Builders

Used in motherboard and PCB bracket mounting, home computer case builds, and consumer electronics enclosure assembly where lightweight, color-matched aluminum standoff spacers provide a precise gap between the PCB and the mounting surface, with a wide range of inner bore and length combinations to match common PCB mounting hole sizes and standoff height requirements.

📺 AV Equipment & Telecommunications Builders

Suitable for TV bracket assembly, audio-visual equipment mounting, office machinery, and telecommunications equipment builds where lightweight, corrosion-resistant anodized aluminum spacers provide precise gap control and support column function between panels, brackets, and enclosure components.

🔧 DIY Makers & Precision Build Enthusiasts

Suitable for any DIY electronics project, custom enclosure build, or precision assembly where a lightweight, color-matched, corrosion-resistant anodized aluminum standoff spacer is needed to set a fixed gap, provide a smooth bearing surface, or act as a support column between two components across M2, M2.5, and M3 bolt sizes.

Material Aluminum Alloy (Anodized)
Spacer Type Unthreaded Round Standoff Spacer (smooth bore — standoff, collar, bushing, or spacer washer function)
M2 Series ID 2.1mm × OD 4mm, length 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / 10 / 12mm
M2.5 Series ID 2.6mm × OD 5mm, length 2 / 2.5 / 3 / 4 / 5 / 6 / 7 / 8 / 10 / 12mm
M3 Series ID 3.1mm × OD 6mm, length 2 / 3 / 4 / 5 / 6 / 8 / 10 / 12 / 15mm
Available Colors Yellow / Blue / Black / Red (anodized)
Surface Treatment Anodizing (corrosion & oxidation resistant)
Tolerance ±0.3mm
Typical Applications FPV drones, RC models, aviation model toys, PCB / motherboard mounting, computer case builds, TV brackets, consumer electronics, audio-visual equipment, telecommunications equipment, DIY precision builds

❓ Frequently Asked Questions

How do I choose the right inner diameter for my bolt or screw?

The inner diameter of the spacer should be slightly larger than the shank diameter of the bolt or screw it will slide over. As a general guide: for M2 bolts (2mm shank), choose the ID 2.1mm series; for M2.5 bolts (2.5mm shank), choose the ID 2.6mm series; for M3 bolts (3mm shank), choose the ID 3.1mm series. Always verify the actual shank diameter of your specific bolt before ordering.

What does the dimension notation ID x OD x Length mean?

The dimension notation uses three values: ID (Inner Diameter — the bore through which the bolt passes), OD (Outer Diameter — the outside width of the spacer body), and Length (the height of the spacer, which sets the gap between the two surfaces). For example, 2.1mm × 4mm × 6mm means Inner Diameter 2.1mm, Outer Diameter 4mm, and Length 6mm. Select your preferred combination from the Dimensions dropdown above.

Are these spacers unthreaded or threaded?

These spacers are unthreaded (smooth bore). The inner bore is smooth and the spacer slides freely over a bolt or screw shank rather than threading onto it. This allows the spacer to function as a pure standoff, collar, bushing, or spacer washer without thread compatibility concerns. For threaded standoffs that screw onto a bolt or accept a screw at each end, you would need a threaded standoff instead.

Are these spacers lighter than steel standoffs?

Yes. Aluminum alloy is significantly lighter than steel — typically about one-third the weight for the same dimensions. These spacers are also non-magnetic, making them suitable for applications where magnetic interference must be avoided, such as near sensitive electronics or sensors in FPV drones and PCB assemblies.

Will the anodized color fade or chip over time?

The anodized finish is integrated into the surface of the aluminum rather than applied as a paint or coating, making it generally more resistant to fading and chipping than painted alternatives under normal use conditions. Hard impacts or heavy abrasion may leave marks, as with any aluminum hardware.

Can I use these spacers outdoors?

The anodized aluminum alloy construction provides good corrosion resistance and oxidation resistance, making these spacers suitable for many outdoor applications under normal weather conditions. For highly corrosive environments (salt spray, prolonged immersion), stainless steel spacers are generally recommended instead.

How do I calculate the wall thickness of a spacer?

Wall thickness = (Outer Diameter − Inner Diameter) ÷ 2. For example, the ID 2.1mm × OD 4mm series has a wall thickness of (4 − 2.1) ÷ 2 = 0.95mm. The ID 2.6mm × OD 5mm series has a wall thickness of (5 − 2.6) ÷ 2 = 1.2mm. The ID 3.1mm × OD 6mm series has a wall thickness of (6 − 3.1) ÷ 2 = 1.45mm.

🛒 Select your Color and Dimensions above, then add to cart.

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