Standard metric hex full nuts, zinc plated with Trivalent Chromium (Cr3) finish. Available in sizes M4 to M20, boxed in trade quantities. Class 8 to DIN 267-4. The kind of thing you always need more of than you think.
Size
QTY
Price
QTY
M4
1500
£4.99£5.99
M5
1000
£4.73£5.68
M6
500
£3.60£4.32
M8
200
£3.08£3.70
M10
100
£3.42£4.10
M12
100
£5.03£6.04
M16
100
£9.78£11.74
M20
50
£9.32£11.18
Zinc hex full nuts are the workhorse of any fixing kit. From structural steelwork to general mechanical assembly, these are the nuts that end up on practically every bolt on a job. Simple, reliable, and made to a proper standard — Class 8 to DIN 267-4 — so you know what you’re getting before the box is even open.
These are plated in Trivalent Chromium (Cr3) Zinc, which is the current standard finish replacing the older hexavalent chromium process. It gives a clean, bright appearance and reasonable corrosion resistance for internal and sheltered external applications. The coating is consistent across the range from M4 right through to M20, so you get the same quality whether you’re working with small machine screws or heavier structural bolts.
Where Zinc Hex Full Nuts Get Used
The full nut profile means full thread engagement, which is what you want when you need the joint to hold. In contrast to half nuts or locknuts, a full hex nut gives maximum clamping strength and works well in combination with washers, spring washers, or nyloc counterparts depending on the application. The standard metric thread across the range means they pair correctly with any metric bolt of the matching size and pitch.
Sizes run from M4 up to M20, covering the majority of general construction, mechanical engineering, and fabrication needs. Box quantities vary by size, so smaller nuts like M4 and M5 come in larger counts, while the heavier M16 and M20 are packed accordingly. Buying in bulk this way makes sense on site — running out of M10 nuts halfway through a steel frame connection is not a situation anyone enjoys.
The DIN 267-4 Class 8 rating confirms these are load-rated fasteners, not economy hardware. That matters when you’re specifying fixings for anything structural or safety-critical, and it gives you something to point to if you’re ever asked about the fastener specification on a job.
Pro Tip: When torquing down zinc plated nuts onto galvanised or coated bolts, a small amount of anti-seize paste on the thread prevents galling, especially on larger sizes like M16 and M20 where the clamping forces are significant.
Zinc hex full nuts are used across construction, steel fabrication, mechanical engineering, plant maintenance, and general site assembly. They work anywhere a standard metric bolt is used and a full-strength nut is required. Common applications include structural steelwork connections, timber frame bolting, machinery assembly, equipment mounting, and general bolted joints where clamping load matters. The M4 to M8 range gets heavy use in light fabrication and electrical panel work, while M10 through M20 suits structural and heavy mechanical jobs.
Best For
Structural steelwork connections
Timber frame and post bolt-down
Mechanical assembly and plant maintenance
General construction fastening
Electrical enclosure and panel work (M4–M8)
Available Sizes
M4
M5
M6
M8
M10
M12
M16
M20
Key Properties
Class 8 rated to DIN 267-4
Trivalent Chromium (Cr3) Zinc plating
Standard metric thread form
Full nut profile for maximum thread engagement
Suitable for use with metric bolts and threaded rod
Not suitable for: Not suitable for exposed external or coastal environments where stainless steel or hot-dip galvanised fasteners would be more appropriate. Not rated for use in elevated temperature applications.
Select the correct size nut to match your bolt diameter and thread pitch. For standard metric bolts, the thread pitch is coarse by default, which is what these nuts are manufactured to. Fit the nut by hand first to confirm thread engagement before applying a spanner or socket, which helps avoid cross-threading, especially on longer runs of threaded rod.
Tighten to the appropriate torque for the bolt grade and size. For Class 8 nuts paired with a matching grade bolt, refer to a standard torque table for the size in question. Where vibration is a concern, pair with a spring washer or nyloc nut as the locking element rather than relying on the hex nut alone.
Confirm the bolt size and thread pitch before selecting the nut — standard metric coarse thread is the default for this range
Check the mating bolt grade is compatible with Class 8 nuts
Start the nut by hand to ensure clean thread engagement before using a tool
Use a flat washer under the nut where the clamping surface is soft or oversized
Tighten with an appropriate spanner or socket to the correct torque for the bolt size and grade
Where vibration or dynamic loads are present, add a spring washer or secondary locking nut
What does Class 8 mean for hex full nuts?
Class 8 refers to the proof load rating of the nut under DIN 267-4. It indicates the nut can sustain the clamping forces associated with a Grade 8.8 bolt without stripping or deforming. It is the standard grade for general structural and mechanical fastening, and is what most engineers specify unless a higher or lower grade is called out specifically.
Are these suitable for outdoor use?
The Trivalent Chromium Zinc plating offers reasonable corrosion resistance for internal use and sheltered external conditions. For direct outdoor exposure, particularly in wet or coastal environments, stainless steel or hot-dip galvanised nuts would be a better choice. The zinc coating is not intended as a long-term weathering finish.
What box quantities are available?
Box quantities vary depending on the size selected. Smaller sizes such as M4 and M5 come in larger counts, while larger sizes like M16 and M20 are packed in smaller quantities per box. The exact quantity is shown when you select the size, and buying by the box is the most cost-effective way to keep the van stocked.
These hex full nuts are manufactured to DIN 934 dimensional standards and rated Class 8 in accordance with DIN 267-4, confirming their proof load and hardness characteristics. The zinc plating uses a Trivalent Chromium (Cr3) process, which meets current RoHS and REACH requirements by avoiding hexavalent chromium. The standard metric thread form is compatible with all ISO metric bolts and threaded rod of the corresponding size.
Thread Standard
ISO Metric (coarse pitch)
Material
Steel
Finish
Trivalent Chromium (Cr3) Zinc plating
Strength Class
Class 8
Standard
DIN 267-4 / DIN 934
Sizes Available
M4, M5, M6, M8, M10, M12, M16, M20
Size
M10, M12, M16, M20, M4, M5, M6, M8
Box Quantity
100, 1000, 1500, 200, 50, 500
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