Original price was: £ 50.00.£ 48.95Current price is: £ 48.95. | £ 58.74 inc VAT
Sonnet Fusion Flex J3i 3-Drive Mounting Bracket
Sonnet Fusion Flex J3i 3-Drive Mounting Bracket
Three-Drive Internal SATA Mounting System For 2023 And 2019 Mac Pro
The Sonnet Fusion Flex J3i is a three-drive internal mounting bracket for 2023 and 2019 Mac Pro systems, allowing you to add your own SATA hard drives and SSDs inside the Mac Pro chassis.
It can hold two 3.5-inch drives plus one 2.5-inch SSD, or three 2.5-inch SSDs, and includes the mounting hardware plus SATA and USB-to-SATA connection cables required for supported configurations.
- Mounts up to three SATA drives inside Mac Pro.
- Supports 2 × 3.5-inch + 1 × 2.5-inch, or 3 × 2.5-inch drives.
- Compatible with Mac Pro 2023 and 2019 desktop/rackmount systems.
- Drives are not included.
Category: Mounting Brackets
Brand: Sonnet Technology
Original price was: £ 212.00.£ 199.95Current price is: £ 199.95. | £ 239.94 inc VAT
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Sonnet Fusion Flex J3i 3-Drive Mounting Bracket – Product Overview
The Sonnet Fusion Flex J3i 3-Drive Mounting Bracket (FUS-FLEX-J3) uses the available internal space and connections in the 2023 and 2019 Mac Pro to add up to three user-supplied SATA drives without placing additional external storage around the workstation.
Up To Three Internal Drives
The bracket supports two 3.5-inch SATA hard drives plus one 2.5-inch SATA SSD, or a configuration of three 2.5-inch SATA SSDs using the included mounting plates.
Designed Specifically For Mac Pro
Fusion Flex J3i is compatible with Mac Pro 8,1 (2023) and Mac Pro 7,1 (2019), in both desktop and rackmount configurations.
Mounting Hardware And Cabling Included
Sonnet includes two 2.5-inch drive mounting plates, a two-drive SATA data/power cable assembly, a USB 3-to-SATA data/power adapter cable, vibration isolators and the required mounting screws.
Hard Drive Vibration Isolation
Shock and vibration isolators help reduce cross-coupled vibration when 3.5-inch hard drives are installed, supporting reliable operation in professional workstations.
Boot Support Depends On Mac Pro Generation And Connection
On a 2019 Intel Mac Pro, suitably configured SATA- or USB-connected SSDs can be used for boot volumes subject to Apple's external-boot security settings. On the 2023 Mac Pro, Sonnet specifies boot support for an SSD connected through the internal USB port; drives connected to the Mac Pro SATA port are not bootable.
Sonnet Fusion Flex J3i 3-Drive Mounting Bracket – Key Features
- Three-drive internal mounting system for Mac Pro 2023 and 2019.
- Supports two 3.5-inch SATA drives plus one 2.5-inch SATA SSD.
- Alternatively supports three 2.5-inch SATA SSDs.
- Compatible with Mac Pro 8,1 (2023) Desktop and Rackmount.
- Compatible with Mac Pro 7,1 (2019) Desktop and Rackmount.
- Includes two 2.5-inch drive mounting plates.
- Includes two-drive SATA data/power cable assembly.
- Includes USB 3-to-SATA data/power adapter cable.
- Includes vibration isolators and mounting screws.
- Heavy-gauge aluminium construction.
- Drives are sold separately.
- Two-year Sonnet warranty.
Sonnet Fusion Flex J3i 3-Drive Mounting Bracket – Technical Specifications
| Product | Sonnet Fusion Flex J3i 3-Drive Mounting Bracket |
| Manufacturer Part Number | FUS-FLEX-J3 |
| Product Type | Internal three-drive expansion bracket |
| Compatible Computers | Mac Pro 8,1 (2023) Desktop/Rackmount; Mac Pro 7,1 (2019) Desktop/Rackmount |
| Drive Capacity | Up to 3 user-supplied SATA drives |
| Drive Configuration | 2 × 3.5-inch + 1 × 2.5-inch, or 3 × 2.5-inch |
| Drive Interface | SATA; included USB 3-to-SATA adapter supports an additional connection path |
| Dimensions | 14 × 12 × 8.7 cm / 5.5 × 4.7 × 3.4 in |
| Included | Expansion bracket, 2 × 2.5-inch mounting plates, two-drive SATA data/power cable, USB 3-to-SATA data/power adapter cable, vibration isolators, mounting screws |
| Drives Included | No |
| Warranty | 2 years |
Sonnet Fusion Flex J3i 3-Drive Mounting Bracket Product Downloads
Sonnet Technology Delivery Information
Generally, next working day delivery services (UK Mainland) are available on standard Sonnet Technology Delivery orders placed before 2 pm (subject to stock availability).
Non-timed deliveries should be delivered between 9 am and 6 pm.
Orders placed after 2 pm on Fridays and weekends will be processed as normal the following Monday.
Orders placed on Bank Holidays will be processed the next working day.
If urgent, please call one of our helpful account managers so they may double check everything for you, enabling you to place your order with confidence.
Please note: these product details are for guide purposes only, and may contain errors.
We always recommend double-checking the product specs and features on the manufacturer website, or contact us if unsure before ordering.



