When you think about commercial vehicle parts, it’s often the larger components that come to mind. Tail lifts. Shutter doors. Electrical systems. But there are plenty of smaller components that play an important role in the everyday operation of commercial vehicles and trailers. Hinges, gudgeons, droplocks, curtain tensioners and rear door fittings might not be the first things you think about, but they all have a job to do. Some help doors open and close. Others help secure equipment, tension trailer curtains or improve vehicle visibility. And with so many different designs and applications, knowing exactly what you’re looking for isn’t always straightforward. So, let’s take a closer look at some of the commercial vehicle body parts you might come across. 1. Hinges & Gudgeons Hinges are used throughout commercial vehicle bodies, particularly on rear doors and other opening sections. Their job is relatively straightforward: allowing a door or panel to open and close while providing the support needed for its intended application. Gudgeons are used as part of certain hinge arrangements, providing a pivot point that allows the connected component to rotate. At Part-Serv, our range includes components such as: Although these components might look fairly simple, there can be important differences between them. For example, a hinge and gudgeon set may be designed for a particular mounting arrangement, while a straight hinge may have different dimensions and fixing requirements. When identifying a replacement, it’s worth checking the overall measurements, mounting hole positions and existing hinge arrangement. A hinge that looks similar isn’t necessarily the correct fit. 2. Droplocks & Fasteners Droplocks and fasteners are another group of components used in commercial vehicle body applications. They’re designed to help secure or fasten parts of the vehicle body, depending on the arrangement they’re fitted to. Part-Serv supplies a selection of droplock and fastening components, including: Our range includes different shank diameters and lengths, with examples such as M8 and M10 fasteners. These measurements matter. Two fasteners may look almost identical in a photograph, but differences in thread size, shank length or fixing arrangement can affect whether they’re suitable for the intended application. That’s why it’s worth checking the measurements and specification of the existing component before ordering a replacement. 3. Curtain Tensioners & Associated Components Curtainsider trailers are widely used across the commercial vehicle industry. Their design allows the side curtains to be opened for loading and unloading, then tensioned and secured for transport. Curtain tensioners form part of the equipment used to tension and secure these curtains. But the tensioner itself isn’t always the only component involved. Depending on the system, there may also be associated parts such as: Part-Serv stocks a selection of curtain tensioners and associated components, including complete tensioner mechanisms and individual replacement fittings. Different curtain systems can use different tensioner arrangements, so it’s important to identify the correct component for your trailer. A photograph of the existing mechanism, together with any part numbers or manufacturer details, can help narrow down the options. Sometimes it’s the smaller component within the system that needs replacing, rather than the complete tensioner assembly. 4. Rear Door Parts Commercial vehicle rear doors rely on several different components to operate and remain in the required position. Some components are used to open and close the doors, while others are designed to retain them when opened. Part-Serv’s rear door parts range includes: A door handle provides a means of operating or accessing the door, depending on the design. Door retainers and hold-back wires, meanwhile, are used in arrangements designed to keep doors in an open position. Although these components may seem relatively straightforward, their dimensions, fixing points and design can vary. For example, a wire door retainer may have a particular length and fitting arrangement, while a universal door retainer may require a different mounting configuration. Checking the existing component and how it’s fitted is important when selecting a suitable replacement. 5. Marker Lights & Reflectors Not every commercial vehicle body component is mechanical. Marker lights and reflectors also play an important role in vehicle visibility. They’re used to help other road users recognise the presence and dimensions of commercial vehicles and trailers, with requirements depending on the vehicle and its configuration. Part-Serv’s range includes 24V LED marker lamps such as: Different colours and designs are intended for different positions and applications. When sourcing a replacement marker lamp, it’s important to consider more than just its appearance. Useful details include: A lamp that looks similar may not necessarily be suitable for the same position or vehicle. Always check that the replacement meets the specification and legal requirements for its intended application. 6. Finding the Right Commercial Vehicle Body Part One of the challenges with commercial vehicle body parts is the variety of designs available. A hinge may look almost identical to another. A droplock fastener may have a slightly different shank length. A curtain tensioner may use a different operating mechanism. A rear door retainer may have different mounting points. And a marker lamp may require a particular connection or fitting arrangement. These differences aren’t always obvious from a photograph. That’s why it helps to gather as much information as possible before ordering a replacement. Where available, provide: Even if you don’t have a part number, the information you can provide may help identify the correct component. Small Components, Important Jobs Commercial vehicle body parts cover a much wider range of products than people might initially realise. Hinges and gudgeons allow doors to operate. Droplocks and fasteners help secure components. Curtain tensioners form part of trailer curtain systems. Rear door handles and retainers support everyday door operation. Marker lights and reflectors contribute to vehicle visibility. Each component has its own purpose, and selecting the correct replacement matters. Whether you’re replacing a damaged fitting, repairing a vehicle body or trying to identify an unfamiliar component, understanding the different options is a useful starting point. Need a Commercial Vehicle Body Part? Part-Serv supplies a range of commercial vehicle body parts, including hinges and