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8.8 grade heat-treated carbon steel, these bolts hit a specific tensile strength window that matters when you're torquing down structrual connections in machinery or building frames. We've run them through the galvanization bath—that zinc layer is about 60-80 microns thick, usually enough for outdoor exposure without getting brittle.
M8, M10, M12 are the go-to metric sizes, but we also stock inch threads: 1/2'', 3/8'', 5/8'', and 1''. Most buyers in construction go with the M12 for beam clamps, while the smaller M8 tends to show up in conveyor systems and light fabrication jigs. The hex head geometry is standerd—nothing fancy, but it grabs a socket well under load.
You're looking at a common bolt connection style, not a shoulder bolt or a flange bolt, so it's best suited for general fastening where you don't need a precision shoulder. Basically, if you're assembling steel racking or bolting down heavy equiment, this is the right call. But it's not ideal for high-vibration environments without a locking washer—that zinc coating can be slick.
We ship on pallets, and the MOQ is usually around 5000 pieces for a mixed size order, but our company can do smaller runs if you're testing a batch. Lead time is typically 20 days or so for custom branding on the head—otherwise, we keep common sizes in stock. The galvanized finish holds up well in coastal or humid conditions, which is something a buyer might not think to ask about until the first rust spot appears.
COA is provided with each lot, and we can run HPLC or tensile tests on request—though for 8.8 grade, the batch hardness is pretty consistent anyway. We've had buyers specify a tighter thread tolerance than the DIN standard, so just flag that upfront if you need it.
For M8, we typically require a minimum of 5000 pieces per order. For M10 and M12, it's 3000 pieces. Let us know your volume, and we can adjust.
Usually 15-20 working days after order confirmation and deposit, depending on the quantity and size mix. We'll give you a firm ETA once we know your specs.
Yes, we can supply a mill test certificate for the carbon steel and a batch test report confirming the 8.8 grade, including hardness and tensile strength. Just request it when you place the order.
Absolutely. The trademark is customizable, so we can stamp your logo or any text on the hex head. There might be a small tooling charge for the first run, but we can discuss that.
They come packed on pallets, usually in strong cartons or bulk bags, with shrink wrap and strapping. We can also do smaller inner packs if you need them for distribution.
