M6 zinc cable tray bolts with hex flange nuts designed for fast, secure cable tray installation. The fixed washer on the flange nut stops it dropping into the driver socket. Available in 12mm, 16mm, 20mm and 25mm lengths, sold in boxes of 200.
Size
Price
QTY
M6 x 12
£6.98£8.38
M6 x 16
£7.51£9.01
M6 x 20
£8.11£9.73
m6 x 25
£8.59£10.31
The zinc cable tray bolt and hex flange nut combination is purpose-built for one job: getting cable tray up quickly and keeping it there. If you’ve ever lost a standard nut down into a socket driver mid-run, you’ll understand exactly why these exist. The fixed washer on the DIN6923 flange nut locks it in place against the driver, so you’re not fishing around every thirty seconds. Small thing, but on a long cable tray installation it makes a real difference.
These zinc cable tray bolts are available in M6 sizes from 12mm up to 25mm, covering the most common tray thicknesses you’ll encounter on site. The M6 x 12 suits lighter gauge single trays, while the M6 x 20 and M6 x 25 give you more thread engagement when stacking or working with heavier cable management systems. Zinc plating provides decent corrosion resistance for indoor and light commercial environments.
Where Zinc Cable Tray Bolts Get Used
These are used by electricians and data installers fitting perforated or solid-bottom cable tray in commercial builds, industrial units, server rooms and plant areas. They’re also used for joining tray sections, fixing brackets, and securing tray lids where a low-profile fixing is needed. The hex flange head gives a clean finish and sits flat without needing a separate washer underneath, which speeds up repetitive fixing work considerably.
Why the Flange Nut Matters
Standard hex nuts on cable tray work are a minor nuisance on a good day. The DIN6923 flange nut here has an integrated serrated washer that grips the tray surface and resists loosening over time. On vibrating equipment or in areas with cable movement, that bite makes a difference. Supplied in boxes of 200, there’s enough here to get a serious run of tray up without constantly reordering mid-job.
At this price and pack size, it makes sense to buy by size rather than mixing lengths in one box. Know your tray specification before ordering and you’ll be sorted from first fixing to last.
Pro Tip: When using a power driver, set the torque low enough to avoid distorting the tray metal around the bolt hole, especially on lighter gauge perforated tray where it's easy to pull the hole out of shape.
Used primarily in commercial and industrial electrical installations for fixing and joining cable tray sections, attaching tray to brackets, and securing cable management components. Common on first and second fix electrical work in office builds, warehouses, server rooms and manufacturing plants. Also used where tray needs to be stacked or tiered, and for fixing tray covers and dividers where a secure, flat-sitting fixing is required.
Best For
Cable tray installation and joining
Bracket fixing on cable management systems
Securing tray lids and dividers
Commercial and industrial electrical fit-out
Available In
M6 x 12mm
M6 x 16mm
M6 x 20mm
M6 x 25mm
Key Features
DIN6923 hex flange nut
Fixed washer prevents nut dropping into driver
Zinc plated for corrosion resistance
Serrated flange grips tray surface
Box of 200
Not suitable for: Not recommended for external or high-humidity environments where stainless steel fixings would be the better choice. These are M6 only, so not suitable where M8 or larger fixings are specified.
Select the correct length for your tray thickness before starting. The bolt should pass cleanly through both tray layers with enough thread to fully engage the flange nut without bottoming out. Fit the bolt through from above, start the flange nut by hand, then drive up with a socket or nut runner. The flange nut's integrated washer bears against the tray surface, so no separate washer is needed.
Avoid overtightening, particularly on thinner gauge tray. The flange nut should be snug and the serrations biting into the surface, not crushing the metal around the hole.
Select the bolt length appropriate for your tray wall thickness and any bracket or joining plate being fixed through
Align the tray sections or components and pass the bolt through from the top or outer face
Start the DIN6923 flange nut by hand on the threaded end to avoid cross-threading
Use a socket driver or nut runner to tighten, keeping the flange nut seated against the tray surface
Tighten to a firm, snug fit, the serrated flange should grip without distorting the tray material
Check alignment before final tightening if joining two tray sections, as adjustment becomes difficult once the nut bites
What does the fixed washer on the flange nut actually do?
It prevents the nut from dropping down into the socket driver when you're working overhead or at awkward angles. Standard nuts have a habit of falling away mid-fix, especially when you're up a ladder. The integrated washer keeps the nut captive in the socket, which speeds up the job considerably.
Are these suitable for outdoor cable tray installations?
Not ideally. The zinc plating offers reasonable protection in dry indoor environments, but for external use or anywhere with persistent moisture, stainless steel fixings are the better call. Zinc will corrode over time in wet conditions, which can cause tray sections to work loose.
Which length should I use for standard cable tray?
For most single-layer perforated tray, M6 x 12 or M6 x 16 will cover it. If you're joining two tray flanges together or fixing through a bracket as well, M6 x 20 or M6 x 25 gives you more thread engagement. When in doubt, measure the total material thickness and add at least 6mm for full nut engagement.
M6 hex head bolts with DIN6923 hex flange nuts, zinc plated for corrosion resistance in indoor and light commercial use. The DIN6923 flange nut incorporates a serrated integrated washer that resists loosening under vibration and eliminates the need for a separate flat washer. Available in four lengths: 12mm, 16mm, 20mm and 25mm. Supplied in boxes of 200.
Thread Size
M6
Available Lengths
12mm, 16mm, 20mm, 25mm
Nut Standard
DIN6923
Finish
Zinc plated
Box Quantity
200
SKU
CTBOLTS
Size
M6 x 12, M6 x 16, M6 x 20, m6 x 25
Box Quantity
200
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