Flare Nut Wrench

The Flare Nut Wrench 1760/2 is the torque-control wrench in the Unior hydraulic-brake kit: a six-point flare-nut profile on the line-side end, a 1/4″ square drive on the other, sized to the 7 mm and 8 mm fittings that dominate current bicycle hydraulic-brake systems. It's the wrench that lets you torque a compression nut to manufacturer spec rather than snugging it by feel and hoping.

Compression-nut work on current bicycle brakes commonly lands in the 7 mm or 8 mm flat-to-flat range, which is what this wrench covers. The flare-nut head loads five of six flats on the fitting through the open slot, which is what stops a soft compression nut from rounding under torque. The 1/4″ square drive on the opposite end matches Unior's own slipper torque wrench in the 2 to 24 Nm cycling-spec range (and the cycling-torque-wrench tier in general), so the same wrench that gets purchase on the fitting also delivers a calibrated torque reading from your bench wrench.

The low-profile body is the other reason this wrench lives on the brake-service bench. Compression nuts on integrated road bikes often sit in the gap between the caliper body and a tight cable port, where a thicker wrench either won't fit or fouls the line. The 1760/2 slips into that space because the head was designed to clear the line dress, not to look like a workshop wrench from a tool-truck catalog.

Specs

• Function: flare-nut wrench with 1/4″ torque-drive end for hydraulic compression nuts
• Sizes: 7 mm and 8 mm
• Six-point flare-nut profile (five flats engaged through the slot)
• 1/4″ square drive on the opposite end, compatible with cycling torque wrenches
• Low-profile body for tight caliper-to-frame clearance
• Trivalent chrome plated per ISO 1456:2009
• Article number: 1760/2

Built in Zreče, Slovenia

Unior has been forging hand tools in Zreče since 1919, and is the official technical partner of multiple World Tour and downhill teams. The 1760-series wrenches are the bench wrenches of the brake-fluid era: small enough to live in a drawer, sized for the fittings that current systems actually use, and chromed to wipe clean of brake fluid between jobs. A 7+8 flare-nut with a torque-drive end is the wrench that does the work most professionally-bled brake systems need done.

Pro tip from our mechanics

Bleeding a hydraulic brake is mostly a fluid-handling job; reassembling it is a torque job. Once the line is connected and bled, the compression nut wants to land at the manufacturer's torque spec exactly, not at “felt right when I stopped.” Plug the 1760/2's 1/4″ drive into a torque wrench from your cycling-torque kit, set the spec, and turn until the click. The procedure removes the over-torque-then-leak cycle that contaminates so many home-bled brakes. Our wrench-selection guide covers which fittings on which brake systems take which Unior wrench, and where the 1760/2's torque-drive end is the deciding factor: Choosing the right wrench for hydraulic disc brake service →