--- title: "What Are Hydraulic Banjo Bolts Used For?" description: "Hydraulic Banjo Bolts (Trade series (hydraulic banjo bolts)) are used for clamping a hose eye between sealing washers at a hydraulic port with the specified…" url: https://engineeringhardware.com/applications/hydraulic-banjo-bolts/ source: Engineering Hardware & Fasteners --- # What Are Hydraulic Banjo Bolts Used For? Bolts · Trade series (hydraulic banjo bolts) · Application guide Typical applications, the industries that specify hydraulic banjo bolts, and how to choose the right size, material and finish for the joint. Hydraulic Banjo Bolts are used for clamping a hose eye between sealing washers at a hydraulic port with the specified flange and thread. They are manufactured to Trade series (hydraulic banjo bolts), and the choice of size, property class and finish is driven by the load in the joint and the environment it sits in. - **Primary duty:** Clamping a hose eye between sealing washers at a hydraulic port with the specified flange and thread - **Governing standard:** Trade series (hydraulic banjo bolts) - **Thread size range:** M10 to M10 - **Category:** Bolts Application notes are general engineering guidance. Verify the property class and any approval requirement against your own design calculation. ![What Are Hydraulic Banjo Bolts Used For? application image](https://engineeringhardware.com/wp-content/uploads/2026/09/Hydraulic-Banjo-Bolts.webp) 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. 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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. Custom manufacturing · Made to drawing ## Need a hydraulic banjo bolts outside the standard range? Lengths and thread lengths outside the standard table are the commonest request, followed by a drive the standard does not offer and a head marked with your own part number. Made by cold heading or hot forging. Minimum order from 2,000 pieces; samples within 7 days of drawing approval. [Custom bolt manufacturing](https://engineeringhardware.com/custom/bolts/)[Send a drawing](https://engineeringhardware.com/custom/bolts/#rfq) ## Technical Drawing Dimensioned line drawing of M10 Hydraulic Banjo Bolts to Trade series (hydraulic banjo bolts). Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected. - **Pitch (mm):** 1.00 - **Thread length (mm):** 11 - **Overall length (mm):** 19 - **Head height (mm):** 5 - **Socket size (mm):** 10 - **Flange OD (mm):** 14 - **Material:** Grade 5 titanium 6Al-4V; pre-drilled for lockwire ## Dimensions & Specifications (Trade series (hydraulic banjo bolts)) | Thread size | Pitch (mm) | Thread length (mm) | Overall length (mm) | Head height (mm) | Socket size (mm) | Flange OD (mm) | Material | | --- | --- | --- | --- | --- | --- | --- | --- | | M10 | 1.00 | 11 | 19 | 5 | 10 | 14 | Grade 5 titanium 6Al-4V; pre-drilled for lockwire | Inside the plant ## Manufactured in our own plant This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided. 1. ![Wire rod feeding into a cold heading machine](https://engineeringhardware.com/wp-content/uploads/2026/08/09-wire-rod-feed-cold-heading-machine.webp) 01 **Cold heading** Wire rod is drawn to size and cold-formed into blanks. Forming rather than cutting keeps the grain flow continuous around the head, which is where a bolt is most likely to fail. Head dimensions and under-head radius checked at set-up and per shift. 2. ![Thread rolling machine producing bolt threads](https://engineeringhardware.com/wp-content/uploads/2026/08/03-thread-rolling-machine-bolt-production.webp) 02 **Thread rolling** Threads are rolled between hardened dies rather than cut. Rolled threads are stronger in fatigue than cut threads and hold pitch and flank angle far more consistently across a batch. Go / no-go ring gauges to ISO 965 tolerance class 6g. 3. ![Baskets of bolts staged for heat treatment](https://engineeringhardware.com/wp-content/uploads/2026/08/05-heat-treatment-baskets-black-bolts.webp) 03 **Heat treatment** Quench-and-temper brings carbon and alloy steel to the property class ordered — 8.8, 10.9 or 12.9 — with the furnace charge tracked so a finished lot can be traced back to it. Core hardness and tensile tested per lot to ISO 898-1. 4. ![Zinc plated bolts in a treatment basket](https://engineeringhardware.com/wp-content/uploads/2026/08/23-zinc-plated-bolts-treatment-basket.webp) 04 **Surface treatment** Zinc, zinc-nickel, hot-dip galvanizing, black oxide, phosphate and Dacromet, selected against the service environment rather than against the price list. Coating thickness and neutral salt spray hours to ISO 9227. ## Frequently Asked Questions ### How do I choose the right size of Hydraulic Banjo Bolts? Match the nominal size to the mating thread or hole. This product is available from M10 to M10; the full dimension table on this page lists each size. ### How tight should Hydraulic Banjo Bolts be torqued? Tighten to the torque for the size and property class so the joint is held by bolt preload. The size pages and torque reference table give recommended values; use a calibrated torque wrench for anything structural. ### What material should Hydraulic Banjo Bolts be for outdoor use? For damp, coastal or chemical environments specify A4 (316) stainless or a suitably coated steel. For indoor or dry use, A2 (304) stainless or zinc-plated steel is normally adequate. ### Are Hydraulic Banjo Bolts made to a recognized standard? Yes — they are manufactured to Trade series (hydraulic banjo bolts), so dimensions are interchangeable between suppliers when you quote the standard on your order. ### Can I get a quote for Hydraulic Banjo Bolts in the size and material I need? Yes. Use the technical drawing and quote form on this page to set the size and options, then send the exact configuration to our team for pricing and lead time. ## Related Pages Product page: [Hydraulic Banjo Bolts — specifications & sizes](https://engineeringhardware.com/fastener/hydraulic-banjo-bolts/) ### Hydraulic Banjo Bolts Specification Guides ### Related Fastener Applications