Aluminium Standoff Spacers M2 - M5 Stand off Collar Round Spacer Bush Washers - HomeDIYer
Aluminium Standoff Spacers M2 - M5 Stand off Collar Round Spacer Bush Washers - HomeDIYer
Aluminium Standoff Spacers M2 - M5 Stand off Collar Round Spacer Bush Washers - HomeDIYer
Aluminium Standoff Spacers M2 - M5 Stand off Collar Round Spacer Bush Washers - HomeDIYer
Aluminium Standoff Spacers M2 - M5 Stand off Collar Round Spacer Bush Washers - HomeDIYer
Aluminium Standoff Spacers M2 - M5 Stand off Collar Round Spacer Bush Washers - HomeDIYer
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Aluminium Standoff Spacers M2 - M5 Stand off Collar Round Spacer Bush Washers - HomeDIYerAluminium Standoff Spacers M2 - M5 Stand off Collar Round Spacer Bush Washers - HomeDIYerAluminium Standoff Spacers M2 - M5 Stand off Collar Round Spacer Bush Washers - HomeDIYerAluminium Standoff Spacers M2 - M5 Stand off Collar Round Spacer Bush Washers - HomeDIYerAluminium Standoff Spacers M2 - M5 Stand off Collar Round Spacer Bush Washers - HomeDIYerAluminium Standoff Spacers M2 - M5 Stand off Collar Round Spacer Bush Washers - HomeDIYer

Aluminum Unthreaded Round Standoff Spacers – ID 2.1–5.2mm, OD 4–10mm, Length 1–35mm

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$2.32 USD
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In stock (1000 units), ready to be shipped

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Description

Aluminum Unthreaded Round Standoff Spacers — ID 2.1–5.2mm, OD 4–10mm, Length 1–35mm

Getting the exact standoff height, inner bore, and outer diameter combination you need for a PCB stack, FPV drone frame, RC model chassis, or electronics enclosure build often means sourcing multiple separate spacer sizes from different suppliers — a slow, expensive process that delays your build. These aluminum unthreaded round standoff spacers are available in a wide matrix of inner diameter, outer diameter, and length combinations — from ID 2.1mm to 5.2mm, OD 4mm to 10mm, and lengths from 1mm to 35mm — giving FPV drone builders, RC model makers, PCB assembly technicians, and DIY electronics builders a precise, lightweight spacer solution in a single product listing.

Each spacer is machined from high-strength aluminum alloy with a natural aluminum finish for excellent corrosion resistance and oxidation resistance. The unthreaded (smooth bore) design means these spacers function as pure standoffs, collars, bushings, or 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: d (Inner Diameter) × D (Outer Diameter) × H (Height/Length) — for example, d4.1 × D6 × H12 means Inner Diameter 4.1mm, Outer Diameter 6mm, Height 12mm.

These aluminum round standoff spacers are widely used in FPV model drone frame stacking, airplane and car scale model assembly, toy and hobby builds, DIY electronics projects, 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, corrosion-resistant, precisely dimensioned unthreaded spacer is needed to set a fixed gap or provide a smooth bearing surface between two components.

✅ Unthreaded (smooth bore) aluminum round standoff spacers. Inner Diameter (d): 2.1, 2.6, 3.1, 3.2, 4.1, 4.2, 5.2mm. Outer Diameter (D): 4, 5, 6, 8, 10mm. Length (H): 1mm to 35mm (see variant options for available combinations). Natural aluminum finish. Tolerance: ±0.3mm. Select your Inner Diameter, Outer Diameter, and Length from the variant options above.

✅ Key Features of These Aluminum Unthreaded Round Standoff Spacers

  • 📐 Wide Dimension Matrix — ID 2.1–5.2mm, OD 4–10mm, Length 1–35mm: Available in a wide matrix of inner diameter (2.1, 2.6, 3.1, 3.2, 4.1, 4.2, 5.2mm), outer diameter (4, 5, 6, 8, 10mm), and length (1mm to 35mm) combinations, covering a broad range of standoff, spacer, bushing, and collar requirements across FPV drone, RC model, PCB, electronics enclosure, and general DIY precision build applications. Select your exact combination from the variant options above.
  • 🔧 Unthreaded (Smooth Bore) Design — Pure Standoff, Collar, Bushing, or Washer Function: The smooth, unthreaded inner bore allows these spacers to slide freely over a bolt or screw shank, functioning as a pure standoff to set a precise gap between two surfaces, a collar to locate a shaft or pin, a bushing to provide a smooth bearing surface, or a thick washer to distribute clamping load. No thread engagement means these spacers can be used with any bolt or screw of the appropriate shank diameter without thread compatibility concerns.
  • ⚡ 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, making these spacers ideal for weight-sensitive builds such as FPV drones, RC aircraft, and portable electronics enclosures where every gram of component weight matters.
  • 🔬 ±0.3mm Precision Tolerance — Consistent Fit Across All Dimension Combinations: Manufactured with ±0.3mm tolerance for consistent inner bore, outer diameter, and length dimensions across all available combinations. Good usability and easy to install — simply slide over the bolt or screw shank and position between the two surfaces to be spaced. Dimension notation: d (Inner Diameter) × D (Outer Diameter) × H (Height/Length).
  • 🌟 Natural Aluminum Finish — Clean, Neutral Metallic Appearance: The natural (uncoated) aluminum finish provides a clean, neutral metallic appearance that complements bare aluminum frames, PCB mounting hardware, and natural-finish components without the color contrast of anodized alternatives. Suitable for builds where a consistent, neutral metallic spacer finish is preferred across all mounting locations.
  • 📦 Versatile Applications — Connecting Rod, Tie Rod, or Support Column: These round aluminum spacers can function as connecting rods between stacked PCBs or frame layers, tie rods to maintain a fixed gap between two panels under tension, or support columns to carry compressive load between two surfaces. Widely used in FPV drone frame stacking, motherboard and PCB bracket mounting, RC model chassis assembly, TV and monitor bracket builds, consumer electronics enclosures, and audio-visual equipment assembly.

🎯 Who Is This For?

🚁 FPV Drone & RC Model Builders

Ideal for FPV drone frame stacking, RC airplane and car model chassis assembly, and hobby build projects where lightweight, precisely dimensioned aluminum standoff spacers provide a fixed gap between frame layers, motor mounts, and electronics stacks across a wide range of inner diameter, outer diameter, and length combinations.

🖥️ PCB, Motherboard & Electronics Builders

Used in motherboard and PCB bracket mounting, home computer case builds, and consumer electronics enclosure assembly where aluminum round spacers provide a precise, lightweight standoff between the PCB and the mounting surface, with a wide range of inner bore and outer diameter combinations to match common PCB mounting hole sizes and standoff column diameters.

📺 AV Equipment & Telecommunications Builders

Suitable for TV bracket assembly, audio-visual equipment mounting, office machinery, and telecommunications equipment builds where lightweight, corrosion-resistant 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, corrosion-resistant, precisely dimensioned unthreaded aluminum round spacer is needed to set a fixed gap, provide a smooth bearing surface, or act as a support column between two components across a wide range of dimension combinations.

Material Aluminum Alloy (Natural Finish)
Spacer Type Unthreaded Round Standoff Spacer (smooth bore — collar, bushing, or washer function)
Inner Diameter (d) 2.1 / 2.6 / 3.1 / 3.2 / 4.1 / 4.2 / 5.2mm
Outer Diameter (D) 4 / 5 / 6 / 8 / 10mm
Length / Height (H) 1mm to 35mm (see variant options for available combinations)
Dimension Notation d (Inner Diameter) × D (Outer Diameter) × H (Height/Length)
Finish Natural aluminum (uncoated)
Tolerance ±0.3mm
Typical Applications FPV drones, RC models, PCB / motherboard mounting, computer case builds, TV brackets, consumer electronics, audio-visual equipment, telecommunications equipment, DIY precision builds

❓ Frequently Asked Questions

What does “unthreaded” mean for these standoff spacers?

Unthreaded means the inner bore of the spacer is smooth — there are no internal threads. 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 (gap setter), collar (shaft locator), bushing (smooth bearing surface), or thick washer (load distributor) 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.

How do I read the dimension notation for these spacers?

The dimension notation uses three values: d (Inner Diameter), D (Outer Diameter), and H (Height or Length). For example, d4.1 × D6 × H12 means the spacer has an Inner Diameter of 4.1mm (the bore through which the bolt or screw passes), an Outer Diameter of 6mm (the outside width of the spacer body), and a Height of 12mm (the length of the spacer, which sets the gap between the two surfaces). Select your Inner Diameter, Outer Diameter, and Length from the three variant dropdowns above.

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, to allow free movement without excessive play. As a general guide: for M2 bolts (2mm shank), choose ID 2.1mm; for M2.5 bolts (2.5mm shank), choose ID 2.6mm; for M3 bolts (3mm shank), choose ID 3.1mm or 3.2mm; for M4 bolts (4mm shank), choose ID 4.1mm or 4.2mm; for M5 bolts (5mm shank), choose ID 5.2mm. Always verify the actual shank diameter of your specific bolt before ordering.

Are these spacers lighter than steel or brass standoffs?

Yes. Aluminum alloy is significantly lighter than steel (typically about one-third the weight) and lighter than brass (typically about half 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.

Can these spacers be used as bushings or bearings?

These spacers can function as simple plain bushings to provide a smooth sliding surface between a rotating or sliding shaft and a housing bore, suitable for low-speed, light-load applications. For high-speed rotation, heavy radial loads, or applications requiring low friction, dedicated bearing bushings or rolling element bearings are generally recommended instead.

What is the wall thickness of each spacer?

The wall thickness is calculated as (Outer Diameter − Inner Diameter) ÷ 2. For example, a spacer with OD 6mm and ID 4.1mm has a wall thickness of (6 − 4.1) ÷ 2 = 0.95mm. Use the Inner Diameter and Outer Diameter values in the variant options to calculate the wall thickness for your specific combination before ordering.

Can I use these spacers outdoors?

The 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.

🛒 Select your Inner Diameter, Outer Diameter, and Length above, then add to cart.

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