Threaded Bar 1m – High Tensile 8.8 DIN 975 – BZP – Pk 10

If you need a 1m bzp high tensile threaded bar that does what the label says, this is it. It’s grade 8.8 carbon steel, made to DIN 975, with a bright zinc plated finish and a full-length thread from one end to the other. No plain shank in the middle, no surprises.

The most common use is suspending services from a concrete soffit. Drop-in anchors go into the slab, the bar screws into them, and your cable tray, trunking or pipework hangs off the other end on nuts and washers. It’s the standard way to do it, and has been for decades, mostly because it works and nobody has come up with anything better that doesn’t cost three times as much.

Cutting High Tensile Threaded Bar to Length

One metre is rarely the length you actually need, which is why most of this gets cut. A hacksaw does the job, though it’s slow and your arm will have opinions about it. An angle grinder with a thin disc is quicker, and a bandsaw is best if you’ve got one on site. Run a nut onto the thread before you cut, then wind it off afterwards. It cleans up any burr and saves you chasing a damaged thread with a file.

Cut lengths are also what you want for chemical anchoring. Bar set in resin into masonry or concrete is far stronger than a mechanical expansion anchor in many situations, and the continuous thread gives the resin plenty to grip. Just remember that BZP is a light plating, so keep it for internal, dry locations. For anything exposed to the weather or damp, you want stainless or hot dip galvanised.

Spotting the Grade on Site

The bar ends are marked yellow. That’s there so you can tell this 8.8 high tensile bar from mild steel studding at a glance. Worth knowing, because the two look identical once they’re sitting in a van next to each other, and mild steel is nowhere near as strong. Mixing them up on a load-bearing fixing is the sort of mistake you only make once, if you’re lucky.

Sizes run from M6 up to M20, so there’s a fit for light fixings through to heavy suspended loads. Smaller sizes suit lightweight trunking and conduit runs. M10 and M12 are the everyday workhorses for cable tray and ductwork. M16 and M20 are for heavier plant, structural brackets and anywhere you’re asking the bar to do real work.

It comes in packs of 10 for most sizes, with a box of 5 on some of the larger diameters, which keeps the weight sensible. Buying in bulk is where the saving is, and it’s handy to have a few lengths spare, because the one you need is always the one you’ve just cut too short.

Match the nuts and washers to the grade where the load matters. A strong bar with a weak nut is only as good as the nut. Class 8 nuts pair properly with 8.8 bar.