Mild Steel Hexagon Slotted Castle Nuts

Product size specifications

（1）Metric Sizes

For Mild Steel Hexagon Slotted Castle Nuts, metric sizes usually run from M4 up to M20, with coarse thread pitch like M10 x 1.5 being the most common. Hex width across flats follows standard wrench sizes—an M10 typically fits a 14mm or 17mm wrench depending on the spec.

（2）Height & Slot Dimensions

Thread diameter is the main reference, but overall height and slot depth matter too. For an M12 version, thickness from bottom to top of slots is roughly 12 to 14mm. Slots are cut deep enough for a standard cotter pin—about half the nut height, so the pin clears the bolt end.

（3）Imperial Sizes

These also come in fractional inch sizes like 1/2"-20 or 5/8"-18. Hex size follows standard SAE wrench sizes, and slot spacing is fixed to match cotter pin diameters, usually 1.5mm to 3mm depending on nut size.

（4）Slot Alignment

One thing to watch: the slots need to line up with the bolt hole after torquing. Most off-the-shelf versions have six slots, each aligned with a flat rather than a corner, so you can usually get the pin in without over-torquing. If you need a specific alignment, it’s worth confirming the slot orientation for bulk orders.

How is the product packaged

Packaging for Mild Steel Hexagon Slotted Castle Nuts is kept simple. Small orders go into clear poly bags first, then into cardboard boxes. The bag keeps moisture out, and the box provides enough protection for standard shipping.

For bulk quantities, we pack them in larger cartons with dividers or layered sheets between batches. This stops the Mild Steel Hexagon Slotted Castle Nuts from rubbing against each other, which can scratch the surface. Each carton gets a label with part number, quantity, and size.

If the order has multiple sizes, we separate them by type and mark each bag clearly. For plated versions, we sometimes add vapor paper to slow moisture during longer transit.

No excessive wrapping—just enough to get them to you without damage. For bulk orders, we can adjust packaging like palletizing or custom labeling if needed.

Q&A session

Can these Nuts be used with standard cotter pins, and do you sell matching pins?

This fastener fits most standard cotter pins you can find on the market. The slot width and depth are consistent, so it’s easy to put together. The thread and hex size match regular industrial bolts, so you don’t need any extra custom parts to pair them up. We don’t include matching cotter pins with your order by default, but if you need them, we can help you source standard ones, and we’ll work out the full cost for you ahead of time.