2U rack mount for 2 × 3.5″ hard drive (stacked, up to 26.1 mm high) with placeholder device

Homelab & Rack

2U rack mount for 2 × 3.5″ hard drive (stacked, up to 26.1 mm high) – 10″ and 19″

2U insert for 2 × 3.5″ hard drive (stacked, up to 26.1 mm high) (101.6 × 147 × 26.1 mm). One carrier, ears for 10″ and 19″ racks included. No supports, PETG or ASA.

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€4.49incl. VAT

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Description

Rack insert, 2 units high, for 2 × 3.5″ hard drive (stacked, up to 26.1 mm high). The device carrier is the same for 10-inch and 19-inch racks; only the ears change. Both pairs of ears are in the download.

  • Two 3.5″ hard drives stacked: the lower one on the slotted floor, the upper one on two ledges, with 6 mm of air between them. For standard-height drives up to 26.1 mm.
  • Screwed from the side to the standard: 4 × 6-32 UNC × 1/4″ per drive into the standard side holes (28.5 and 130.1 mm from the connector end, 6.35 mm above the bottom). Through the 3.6 mm wall the screw goes 2.75 mm deep; we plan 3.0 mm at most (depending on the edition the standard allows 3.02 to 3.56 mm).
  • Connectors at the back: SATA or SAS ports face the back, the carrier is open at the back. Vent slots in front.
  • Rear support is mandatory here: two hard drives weigh more than 1 kg; the insert belongs in a 4-post rack with the support brackets.
  • Ears with slots: 10″ for 234.0–239.5 mm hole spacing (there is no standard for 10″ racks), 19″ for 465.1 ± 1 mm. Fits #10-32, M5 and M6.
  • Carrier–ear joint: 2 × M3 countersunk per side with a nut in a pocket, plus tongue and groove so the fronts sit flush.
  • Rear support for 4-post racks: screw two support brackets (left and right are the same file) to the rear rails; their rib slides into the groove at the rear end of the carrier. For 10″ short (carrier end to rear rail 1–64 mm) and long (1–124 mm), for 19″ one length (1–124 mm). The carrier is 176 mm deep.
  • 19″ ears in two versions: with stiffening beam (also in 2-post racks) or light without the beam (only together with the rear brackets).

Load: without rear support (2-post rack) 1 kg at most, with rear support (4-post rack) 2 kg per insert at most. Both are guide values, not a tested load rating. Two 3.5″ hard drives weigh about 0.9–1.56 kg together (WD Red Plus and Seagate IronWolf datasheets), so use it only with rear support (4-post rack).

Dimensions: drive 101.6 × 147 × 26.1 mm (W × D × H). Dimensions taken from SNIA SFF-8301 Rev 1.9 (3.5″ drive standard); our part has not been tested on the device yet. 0.5 mm clearance per side. Print the free rack fit test part first if you are unsure about your rack or printer.

Bay 102.85 mm wide (drive 101.6 ± 0.25, Seagate up to 101.85); screw holes slotted ± 1.0 mm because the hole positions are measured from the connector end and drives are 146–147 mm long.

Dimensions

Width210 mm
Height176 mm
Depth88 mm
Weight (printed)178 g
Layer height0.2 mm
Walls3
Infill15 %

Dimensions of the default variant in print orientation.

Material and temperature

Mini PCs often run around the clock and get warm: PETG or ASA cope with that, PLA deforms over time. Do not block the device's vents.

Print orientation: Carrier: front face down. Ears: upright, as the files are laid out. Support brackets: lying on their rear plate.

Safety notice

Without rear support (2-post rack) 1 kg at most, with rear support 2 kg per insert at most (guide values, not a tested load rating). Keep the device's vents free and do not pinch cables. The part only holds the device and carries no current itself. Holders for devices, not an electrical component: do not install or modify anything carrying mains voltage in or on them. 2 kg per rack mount at most (guide value, not a tested load rating); from 1 kg, support the device at the back as well. Print in PETG or ASA because of the constant warmth and keep the device's ventilation free.

Not an original part. No affiliation with the vehicle or device manufacturers named; make and model names only indicate fitment.

What's included

You get one ZIP with:

  • STL – print-ready mesh
  • 3MF – with print profile
  • STEP – editable in CAD

You will also need

  • 4 × M3×10 countersunk screw (ISO 10642)
  • 4 × M3 nut (ISO 4032)
  • 8 × Your rack's screw (#10-32, M5 or M6) with a washer
  • 4 × More rack screws with washers for the support brackets (4-post racks only)
  • 8 × Hard drive screw 6-32 UNC × 1/4″ (6.35 mm), flat or pan head, not longer

Printing

  1. Print the carrier front face down, the ears upright as the files are laid out. PETG or ASA, 0.2 mm layers, 3 walls, 15 % infill, no supports.
  2. Print the ear for your rack (10″ or 19″) twice; the left ear is the right one turned upside down.
  3. 4-post rack: print the matching support bracket twice, lying on its rear plate as the file is laid out; left and right are the same file.

Installation

  1. Press the M3 nuts into the pockets of the carrier's end walls from inside.
  2. Fit the ears (tongue into groove) and fasten each with 2 × M3×10 countersunk screws.
  3. Slide the lower drive onto the floor from the back (connectors to the back) up to the front stop, then the upper one onto the ledges; fasten each with 4 × 6-32 × 1/4″ from outside through the side walls.
  4. 4-post racks only: loosely screw both support brackets to the rear rails, in the same rack unit as the insert (the lower one for 2U), ribs facing in.
  5. Slide the insert in from the front (the grooves at the carrier's end slide onto the ribs) and screw it in with rack screws and washers.
  6. Push the support brackets sideways against the carrier and tighten them, then slide the device in.

FAQ

Which material should I use for this rack mount?

Recommended: PETG (alternatively ASA). Mini PCs often run around the clock and get warm: PETG or ASA cope with that, PLA deforms over time. Do not block the device's vents.

Do I receive a printed part?

No. You get the print files and print the part yourself or use a print service. You get the download link right after payment.

Does it fit my 10-inch rack?

The 10″ ears have slots for 234.0 to 239.5 mm hole spacing (centre to centre) and are 253 mm wide; the ear flanges need 218 mm clear width between the rails. We found 221–222 mm on 10″ racks. Usable depth: see dimensions.

Which material?

PETG or ASA. No PLA: devices run warm around the clock in a rack and PLA creeps over time.

Do I need the rear support?

Above 1 kg device weight, yes. It needs rear rails (4-post rack); in a 2-post rack the limit is 1 kg. With support the limit is 2 kg per insert. Both are guide values, not a tested load rating. Use the light 19″ ears without beam only with the rear support.

Which support bracket fits my rack?

Measure from the rear end of the carrier to the front face of the rear rail. Up to 64 mm the short 10″ bracket fits (front and rear rails at least 120 mm apart), up to 124 mm the long one (at least 180 mm). The 19″ bracket reaches 124 mm (at least 180 mm). If the rear rails sit further back, move them forward if your rack allows it, or use a rack shelf.

Can I use M3 screws?

No. 3.5″ hard drives have 6-32 UNC imperial threads. Use 6-32 × 1/4″; longer screws go too deep into the drive.

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    Version 1.0.0, updated 4 November 2026 · SKU HL-HDD35-2X-2U

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