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.
Available options and pricing for Machine Screw - CSK - BZP, with quantity selectors and a running total
Size
SKU
Price
QTY
Total
M4 x 8
4008CPM
£0.87£1.04
—
M4 x 10
4010CPM
£0.90£1.08
—
M4 x 12
4012CPM
£0.91£1.09
—
M4 x 20
4020CPM
£1.10£1.32
—
M4 x 25
4025CPM
£1.23£1.48
—
M4 x 40
4040CPM
£1.63£1.96
—
M5 x 10
5010CPM
£1.19£1.43
—
M5 x 12
5012CPM
£1.26£1.51
—
M5 x 16
5016CPM
£1.44£1.73
—
M5 x 20
5020CPM
£1.58£1.90
—
M5 x 25
5025CPM
£1.76£2.11
—
M5 x 30
5030CPM
£2.00£2.40
—
M5 x 40
5040CPM
£2.43£2.92
—
M5 x 50
5050CPM
£2.78£3.34
—
M6 x 10
6010CPM
£1.49£1.79
—
M6 x 12
6012CPM
£1.64£1.97
—
M6 x 16
6016CPM
£1.91£2.29
—
M6 x 20
6020CPM
£2.10£2.52
—
m6 x 25
6025CPM
£2.31£2.77
—
M6 x 30
6030CPM
£2.76£3.31
—
M6 x 40
6040CPM
£3.23£3.88
—
M6 x 50
6050CPM
£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.
BZP CSK machine screws are used widely in ironmongery fitting, door hardware installation, cabinetmaking and general mechanical assembly. They're the standard fixing for attaching handles, knobs and levers to backplates, as well as securing panels, covers and brackets where a flush head finish is required. Joiners, locksmiths, shop fitters and maintenance engineers all carry these as a matter of course.
Best For
Fixing handles to backplates
Door furniture installation
Cabinet and panel fixing
General mechanical assembly
Interior ironmongery
Available In
M4 x 8, 10, 12, 20, 25, 40mm
M5 x 10, 12, 16, 20, 25, 30, 40, 50mm
M6 x 10, 12, 16, 20, 25, 30, 40, 50mm
Key Features
Bright zinc plated finish
Countersunk head for flush fit
Metric thread
B point tip for easy location
Sold in boxes of 100
Not suitable for: Not suitable for use in fully exposed outdoor environments where prolonged moisture is likely, as the BZP coating will not offer sufficient long-term protection. These are not self-tapping screws and require a pre-tapped hole or nut and washer to fix correctly.
Select the correct diameter and length for your application before fitting. The screw should pass cleanly through the clearance hole in the handle or fitting, and engage fully with the thread in the backplate or a nut behind the panel. A countersunk hole in the fitting is needed for the head to sit flush.
Use a Pozidriv or slotted screwdriver bit to match the head recess — check the head type before driving, as cross-head profiles vary. Tighten firmly but do not overtighten, particularly through thinner backplates where stripping the thread is a real possibility.
Confirm the screw diameter and length suit your fitting before starting
Ensure the receiving hole is pre-tapped or a suitable nut is in place on the reverse
Check the fitting has a countersunk recess to allow the head to sit flush
Insert the screw through the clearance hole and locate into the thread
Drive with an appropriate screwdriver bit, keeping it square to avoid cam-out
Tighten to a firm fit without overtightening, especially in shallow threads
Do these machine screws come with nuts?
No, nuts are not included. These are machine screws only. If your application does not have a pre-tapped hole to receive the thread, you will need to source suitable nuts separately.
Can these be used outdoors?
They can cope with occasional light moisture, but the bright zinc plating is not designed for sustained outdoor exposure. For external hardware or anything regularly exposed to rain, stainless steel fixings would be a better choice.
These machine screws are manufactured to metric thread standards with a countersunk head profile and a B point tip. The bright zinc plating is applied by electrodeposition, providing a layer of corrosion resistance suitable for interior and sheltered use. Head drive type is standard cross-head. Thread form is ISO metric, compatible with standard tapped holes and metric nuts across M4, M5 and M6 diameter ranges.
Thread Type
Metric (ISO)
Head Type
Countersunk (CSK)
Point Type
B Point
Finish
Bright Zinc Plated (BZP)
Available Diameters
M4, M5, M6
Box Quantity
100
Application
Interior and sheltered environments
Size
M4 x 10, M4 x 12, M4 x 20, M4 x 25, M4 x 40, M4 x 8, M5 x 10, M5 x 12, M5 x 16, M5 x 20, M5 x 25, M5 x 30, M5 x 40, M5 x 50, M6 x 10, M6 x 12, M6 x 16, M6 x 20, m6 x 25, M6 x 30, M6 x 40, M6 x 50
Box Quantity
100
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