The primary duty of Hydraulic Banjo Bolts is clamping a hose eye between sealing washers at a hydraulic port with the specified flange and thread. Below: the sectors that specify them in volume, the checklist used to select the right size and material for the application, installation notes, and the known limits of the type. Stocked across roughly M10 to M10, they cover general to heavy-duty work.
Typical Applications for Hydraulic Banjo Bolts
The most common settings where these are specified:
- Hydraulic brakes: A compact banjo bolt joins a hose eye to a caliper or master cylinder.
- Motorcycle service: The pre-drilled head accepts lockwire where specified.
- Race equipment: Titanium reduces mass while the flange seats the copper washers.
- Hydraulic maintenance: Thread, flange and washer geometry control the fluid seal.
How to Specify Hydraulic Banjo Bolts for Your Application
- Size: Match the nominal size to the mating thread or hole. This product spans M10–M10; check the full table below for the exact dimensions of each size.
- Strength class: Choose the property class (e.g. 8.8, 10.9, 12.9 or A2/A4 stainless) for the load and environment, and tighten to the matching torque so the joint relies on preload, not friction.
- Environment: For damp, coastal or chemical exposure prefer A4/316 stainless or a suitable coating; indoors, plated steel or A2 is usually sufficient.
- Standard: This product is supplied to Trade series (hydraulic banjo bolts). Quoting the standard on your order guarantees interchangeable dimensions between suppliers.
Installation & Assembly Practice
- Tighten to the torque for the size and property class with a calibrated wrench — the joint is held by preload, not by the thread friction alone.
- Ensure at least one full thread projects beyond the nut after tightening, and never re-use a bolt that has been tightened into yield.
- Under slotted or oversized holes, fit a hardened washer so the preload does not relax into the hole edge.
Common Selection Mistakes with Hydraulic Banjo Bolts
- Specifying class 12.9 "to be safe" in a corrosive environment — high classes are more sensitive to hydrogen embrittlement and stress corrosion; 8.8 hot-dip galvanized often outlasts them outdoors.
- Choosing a length that puts the shear plane through the threaded portion when a plain shank (partially threaded bolt) was available.
- Mixing stainless bolts with plated-steel nuts: the joint loses its corrosion logic and can gall or seize.
Where Hydraulic Banjo Bolts Are Not the Right Choice
Not for permanent joints that will never be opened (a rivet or weld is cheaper), and not where the head must sit flush — use a countersunk screw instead.
