--- title: "What Are Solar Flashing Lag-Bolt Roof Attachments Used For?" description: "Solar Flashing Lag-Bolt Roof Attachments (Trade series (flashed lag-bolt roof attachments)) are used for carrying or reinforcing a run of pipe, tray or rail,…" url: https://engineeringhardware.com/applications/solar-flashing-lag-bolt-roof-attachments/ source: Engineering Hardware & Fasteners --- # What Are Solar Flashing Lag-Bolt Roof Attachments Used For? Supports, Clamps & Brackets · Trade series (flashed lag-bolt roof attachments) · Application guide Typical applications, the industries that specify solar flashing lag-bolt roof attachments, and how to choose the right size, material and finish for the joint. Solar Flashing Lag-Bolt Roof Attachments are used for carrying or reinforcing a run of pipe, tray or rail, with separate bolts or rods making the final fixing. They are manufactured to Trade series (flashed lag-bolt roof attachments), and selection is driven by the nominal size, the fit and tolerance the assembly requires, and the service environment. - **Primary duty:** Carrying or reinforcing a run of pipe, tray or rail, with separate bolts or rods making the final fixing - **Governing standard:** Trade series (flashed lag-bolt roof attachments) - **Category:** Supports, Clamps & Brackets Application notes are general engineering guidance. Verify the property class and any approval requirement against your own design calculation. ![What Are Solar Flashing Lag-Bolt Roof Attachments Used For? application image](https://engineeringhardware.com/wp-content/uploads/2026/09/Solar-Flashing-Lag-Bolt-Roof-Attachments.webp) The primary duty of Solar Flashing Lag-Bolt Roof Attachments is carrying or reinforcing a run of pipe, tray or rail, with separate bolts or rods making the final fixing. 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. ## Typical Applications for Solar Flashing Lag-Bolt Roof Attachments The most common settings where these are specified: - **General machine building:** fastening covers, brackets, motors and sub-assemblies on production equipment. - **Maintenance & repair (MRO):** a stocked size for servicing existing plant where the original fastener spec must be matched. - **Fabrication & metalwork:** bench and on-site assembly of steel frames, enclosures and weldments. 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Quoting the standard on your order guarantees interchangeable dimensions between suppliers. ## Where Solar Flashing Lag-Bolt Roof Attachments Are Not the Right Choice Match the fastener to the load, environment and whether the joint must be reopened; the wrong class or style is the usual cause of joint failure. Custom manufacturing · Made to drawing ## Need a solar flashing lag-bolt roof attachments outside the standard range? With no standard to depart from, the tolerance scheme is the specification — which dimensions are critical, and which are simply nominal. Made by milling or stamping. Minimum order from 2,000 pieces; samples within 7 days of drawing approval. [Custom support & bracket manufacturing](https://engineeringhardware.com/custom/supports/)[Send a drawing](https://engineeringhardware.com/custom/supports/#rfq) ## Technical Drawing Dimensioned line drawing of through the shingle into the rafter Solar Flashing Lag-Bolt Roof Attachments to Trade series (flashed lag-bolt roof attachments). Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected. - **Water management:** flashing plate under the course above - **Fixing:** lag bolt with bonded seal - **Selected by:** rafter size and rail bracket ## Dimensions & Specifications (Trade series (flashed lag-bolt roof attachments)) | Penetration | Water management | Fixing | Selected by | | --- | --- | --- | --- | | through the shingle into the rafter | flashing plate under the course above | lag bolt with bonded seal | rafter size and rail bracket | | through the shingle into the rafter | flashing plate with raised collar | lag bolt with bonded seal | rafter size and rail bracket | 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 ### What are Solar Flashing Lag-Bolt Roof Attachments used for? Carrying or reinforcing a run of pipe, tray or rail, with separate bolts or rods making the final fixing. They are supplied to Trade series (flashed lag-bolt roof attachments). ### Which industries use Solar Flashing Lag-Bolt Roof Attachments? They are commonly specified in general machine building, maintenance & repair (mro) and fabrication & metalwork, among other sectors. ### How do I choose the right size of Solar Flashing Lag-Bolt Roof Attachments? Match the size to the mating part using the dimension table on this page. ### Are Solar Flashing Lag-Bolt Roof Attachments made to a recognized standard? Yes — they are manufactured to Trade series (flashed lag-bolt roof attachments), so dimensions are interchangeable between suppliers when you quote the standard on your order. ### Can I get a quote for Solar Flashing Lag-Bolt Roof Attachments 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: [Solar Flashing Lag-Bolt Roof Attachments — specifications & sizes](https://engineeringhardware.com/fastener/solar-flashing-lag-bolt-roof-attachments/) ### Solar Flashing Lag-Bolt Roof Attachments Specification Guides ### Related Fastener Applications