Machine Screw – CSK – BZP
From £0.87£1.04 EX VATINC VAT
Bright zinc plated countersunk machine screws with a metric thread and B point tip. Sold in boxes of 100, available in M4, M5 and M6 across a range of lengths. A solid choice for fixing handles, backplates and general mechanical assembly.
| Size | Price | QTY |
|---|---|---|
| M4 x 8 | £0.87£1.04 | |
| M4 x 10 | £0.90£1.08 | |
| M4 x 12 | £0.91£1.09 | |
| M4 x 20 | £1.10£1.32 | |
| M4 x 25 | £1.23£1.48 | |
| M4 x 40 | £1.63£1.96 | |
| M5 x 10 | £1.19£1.43 | |
| M5 x 12 | £1.26£1.51 | |
| M5 x 16 | £1.44£1.73 | |
| M5 x 20 | £1.58£1.90 | |
| M5 x 25 | £1.76£2.11 | |
| M5 x 30 | £2.00£2.40 | |
| M5 x 40 | £2.43£2.92 | |
| M5 x 50 | £2.78£3.34 | |
| M6 x 10 | £1.49£1.79 | |
| M6 x 12 | £1.64£1.97 | |
| M6 x 16 | £1.91£2.29 | |
| M6 x 20 | £2.10£2.52 | |
| m6 x 25 | £2.31£2.77 | |
| M6 x 30 | £2.76£3.31 | |
| M6 x 40 | £3.23£3.88 | |
| M6 x 50 | £4.00£4.80 |
The BZP CSK machine screw is one of those items that turns up on almost every job in some form. Countersunk head, metric thread, B point tip — nothing fancy, just a well-made fixing that does exactly what it says. Whether you’re fitting door furniture, securing backplates, or working through a panel fixing job, these are the screws you reach for when a clean flush finish matters.
BZP stands for bright zinc plated, which means each screw carries a zinc coating applied by electroplating. This gives a decent level of corrosion resistance for indoor and sheltered applications, and the bright finish looks clean against metalwork and hardware. It won’t stand up to full outdoor exposure long-term, but for interior ironmongery, cabinet fittings, and general mechanical assembly, it’s perfectly suited.
Where BZP CSK Machine Screws Are Used
The countersunk head profile is the key detail here. When seated correctly in a matching countersunk hole, the head sits flush with or just below the surface. That matters a great deal when fitting handles to backplates — you don’t want proud heads catching fingers or preventing covers from seating properly. The B point tip provides a slight lead-in, which helps locate the screw into a pre-tapped hole or a clearance hole with a nut behind it.
These are not self-tapping screws. They require either a pre-tapped hole in the receiving material, or a nut and washer on the reverse. That distinction is worth keeping in mind if you’re ordering for a mixed fixings job. The metric sizing across M4, M5 and M6 in various lengths gives a useful spread for most hardware fitting scenarios — M4 for lighter fittings and smaller backplates, M5 and M6 where a bit more clamping force is needed.
Sizing Options
The range covers M4 in lengths from 8mm to 40mm, M5 from 10mm to 50mm, and M6 from 10mm to 50mm. Sold in boxes of 100, which is a sensible quantity for trade use — enough to get through a decent run of ironmongery without running short mid-job. If you’re kitting out a batch of doors or fitting a set of cabinet pulls, a box tends to disappear faster than you’d expect.
The bzp csk machine screw is a straightforward, dependable fixing. Nothing to overthink — order the right diameter and length for your hardware, and you’re good to go.
Pro Tip: When fitting handles to backplates, check the hardware manufacturer's recommended screw length before ordering — a screw that's 5mm too long will bottom out in the thread before the handle pulls tight, and you'll be back to the van for replacements.
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