For plant managers and maintenance engineers running vibrating screens, screening media gets most of the attention, but the screen hardware holding it in place is what actually determines how long that media lasts. Clamping plates, tension bolts, hook bolts and nosing keep a panel correctly tensioned against the camber bars. When any one of them wears or loosens, the screen moves, and a screen that moves fails early through no fault of the media itself. This guide covers what each hardware component does, the assembly options available, what poor hardware quality costs in throughput and deck life, and what to check when you next specify or replace screen hardware.
Why Hardware Quality Matters as Much as the Media
A screen deck is a system, not a single component. The screening media is only as effective as the hardware holding it under tension. Loose or worn hardware lets the deck flex and shift under vibration, which accelerates wear on the media itself and can mask the real cause of a short service life. Before troubleshooting a media problem, it is worth checking whether the hardware securing it is actually the issue.
- Clamping Plates – Clamping plates are supplied in 2 bend or 3 bend to suit the vibrating screen make, with or without punched holes. Polyurethane-coated versions add wear resistance and a cushioning effect that helps prevent damage to delicate workpieces during clamping, and their non-marking, noise-dampening properties suit environments where that matters. They also resist oils, chemicals and abrasion, which extends the plate’s working life over bare metal. For clamping plates with holes, Screen Products can supply a drawing to complete so holes are punched in the correct sequence for your machine.
- Clamp and Tension Bolts – Clamp and tension bolts come in M20, available in 140, 160 and 200 lengths, manufactured from 8.8 high-tensile material. The standard assembly is a cup square bolt, dome washer, plain washer and hex nut, which together hold the clamping plate under load against continuous vibration.
Where the deck or channel calls for it, Screen Products also supplies a hammerhead bolt assembly (hammerhead bolt, dome washer, flat washer and hex nut) as an alternative fixing. The two assemblies are not interchangeable, so confirm which one your deck takes before ordering. All parts are also sold separately, so a worn washer or nut does not require replacing the full assembly. - Hook Bolts – Hook bolts, also in 8.8 high-tensile grade, fasten and maintain tension on screening media within side-tensioned deck systems. The hooked end engages the screen frame or support channel and the threaded end takes a nut and washer. Correctly tensioned, they reduce movement, prevent lifting, and help keep the screen aligned and performing consistently. Hook dimension follows the side plate measurement, no less than 20mm each side.
- Capping and Nosing – Capping and nosing, in rubber (short leg or long leg, in 30m rolls) or polyurethane (1m and 1.2m lengths), acts as a buffer between the screen and the stringer frame. Polyurethane nosing is more robust and wears more slowly than rubber in screening applications, though rubber remains a lower-cost option where wear rates are less severe. It should be replaced at the first sign of wear or damage rather than left to run to failure.
What Worn Hardware Costs You
Hardware failures rarely announce themselves. Tension drops gradually, the screen lifts and moves under vibration, and wire fails well before its expected life.
Nosing is the clearest example, keeping the screen off bare steel at the camber bars. Once it wears through, the media works against the frame and wears from underneath, out of sight. The same applies to a thinned clamping plate, a stretched bolt that no longer holds load, or a hook bolt that has lost its grip on the frame; any one of them lets the deck move, and a moving deck accelerates wear on the media it is supposed to be holding still.
The result is a changeout that was not due, plus the downtime that comes with it.
Specifying Screen Hardware That Lasts
Why Choose Screen Products for Screen Hardware
Screen Products supplies the full range of screen hardware alongside our screening media, including clamping plates, tension bolt assemblies, dome washers, hook bolts, and capping in rubber and polyurethane, so your deck and its supporting hardware can be specified from a single supplier. On-site surveys and installation support are available where fitment or configuration needs confirming before you order.
Get In Touch
Contact us to check stock or to discuss the correct specification for your deck.
Derrick Cochrane, Operations Director: 063 516 8720 / derrick@screenproducts.co.za
Jason Kinnear, Technical Director: 082 306 5964 / jason@screenproducts.co.za