M12 x 1.75p Metric Coarse Galvanised Channel Strut Nuts Long Spring

About Channel Strut Nuts

Channel Strut Nuts fit into the slotted opening of strut channel (Unistrut, Easystrut, P1000 and similar). Slide along the channel to the position you need, then tightening a bolt down through the channel pulls the nut up into the channel's inwards-facing flanges, clamping it in place. Available with or without a captive spring that holds the nut at the tightening position while you start the bolt. Also used in vehicle roof rack systems, where the rack feet clamp into the channel rails fitted along the roof.

Recommended use The standard outdoor finish for timber framing, fencing, decking, retaining walls and treated-timber contact (H3 and H4 treated pine). Decades of corrosion protection in most outdoor and rural environments.

Frequently Asked Questions

Material & Coating

Galvanised Hot-dip galvanised carbon steel. The standard outdoor finish; thick zinc coating gives decades of corrosion resistance. The right choice for trailer chassis, mast and pole mounting, structural pipe clamping and outdoor tank fittings.

Matching Finishes Always match the finish across the assembly. Hot-dip galvanising adds a much thicker coating than zinc plating, so a zinc-plated nut will not wind onto a galvanised bolt, and a galvanised nut on a zinc-plated bolt will be loose. Pair galvanised bolts with galvanised nuts and washers.

Important Performance in permanent coastal applications (within 300 metres of the sea) is reduced. Refer to AGA technical bulletins or contact us for the right grade for severe marine exposure.

Class Metric fasteners are classified as class 2, 4.6, 8.8, 10.9, 12.9, 14.9. See the head marking chart and full strength table.

Thread Pitch & Terminology

Thread Pitch (Metric) Metric fasteners measure thread pitch as the distance between thread peaks, expressed in millimetres. Metric also branches into three series: coarse (the default; widest tolerance, easiest to tap), fine (a tighter pitch for higher clamp load or thinner walls), and extra fine (the tightest pitch, used for thin-wall tube, precision instruments, and aerospace fittings where vibration loosening must be minimised). Always match the series as well as the size - a metric fine nut will not engage a metric coarse bolt of the same diameter, and an extra fine nut will not engage either. This product has a 1.75mm coarse pitch, meaning the peaks are 1.75mm apart.

How to Measure

Sizing Channel nuts have two sizes that matter: the thread (M6, M8, M10) the bolt screws into, and the channel profile the nut fits - ours suit standard 41mm strut channel. The spring, where fitted, holds the nut in position inside the channel while you bolt up. Confirm both in the specifications table above.

Resources

Pricing & Delivery

Includes GST, a Tax Invoice and Free Standard Delivery anywhere in Australia.

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Disclaimer

Technical data Researched and compiled from numerous industry sources for the sole purpose of providing basic information. All material is advisory only and its use by anyone is entirely voluntary. Reliance on it for any purpose by anyone is at the sole risk of that person, and Bolt and Nut Australia is not responsible for any loss, claim or damages arising therefrom. In developing this information, Bolt and Nut Australia has made a determined effort to present it accurately.

Measurements Sizes are taken from supplier catalogues or hand-measured and should be used as a guide. Minor variation between batches is normal. Stock is sourced from various suppliers, so differences may exist between batches in thread length, markings, appearance or finish.

Product Photos & PDF Data Sheets Represent the product type, not exact size. PDFs are a reference guide only. Specifications may change without notice.

If you see any problems with any of our specifications or you require additional information please contact us.