High Efficiency Metric Square Head Bolts

High Efficiency Metric Square Head Bolts allow the use of standard open-end or adjustable wrenches, providing a secure grip that helps prevent rounding. As a professional global supplier, Xiaoguo® supplies a wide range of standard and specialized fastener products globally.

Model:ASME/ANSI B18.2.1-1-1965

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Product Description

To help High Efficiency Metric Square Head Bolts resist rust better and look nicer, they get different surface treatments. Common ones include electroplated zinc—with clear, yellow, or black chromate coatings—and this gives basic rust protection. Hot-dip galvanizing adds a thick, tough zinc layer, which works well in harsh places.

Stainless steel metric square head bolts naturally don’t rust as easily. There are other options too, like phosphate coatings (usually used under paint), black oxide (which helps with looks and a little rust resistance), or mechanical plating. Which one you pick depends on how much rust protection you need.

Product Parameters

Mon	3/8	7/16	1/2	5/8	3/4	7/8	1	1-1/8	1-1/4	1-3/8	1-1/2
P	16\|24\|32	14\|20\|28	13\|20\|28	11\|18\|24	10\|16\|20	9\|14\|20	8\|12\|20	7\|12\|18	7\|12\|18	6\|12\|18	6\|12\|18
ds max	0.388	0.452	0.515	0.642	0.768	0.895	1.022	1.149	1.277	1.404	1.531
s max	0.562	0.625	0.75	0.938	1.125	1.312	1.5	1.688	1.875	2.062	2.25
s min	0.544	0.603	0.725	0.906	1.088	1.269	1.45	1.631	1.812	1.994	2.175
e max	0.795	0.884	1.061	1.326	1.591	1.856	2.121	2.386	2.652	2.917	3.182
e min	0.747	0.828	0.995	1.244	1.494	1.742	1.991	2.239	2.489	2.738	2.986
k max	0.268	0.316	0.348	0.444	0.524	0.62	0.684	0.78	0.876	0.94	1.036
k min	0.232	0.278	0.308	0.4	0.476	0.568	0.628	0.72	0.812	0.872	0.964
r max	0.03	0.03	0.03	0.06	0.06	0.06	0.09	0.09	0.09	0.09	0.09
r min	0.01	0.01	0.01	0.02	0.02	0.02	0.03	0.03	0.03	0.03	0.03

Product Details

High Efficiency Metric Square Head Bolts follow ISO metric standards like DIN 478 (partial thread) and DIN 479 (full thread) — these standards lay out their main sizes. The head size (width across the flat parts) goes with the bolt’s diameter. For example, an M8 bolt usually has a 13mm head.

Standard lengths go from short machine screw sizes all the way up to several hundred millimeters. The threads follow ISO metric coarse (M) or fine (MF) pitch standards. When you specify metric square head bolts, you need to note the diameter (M), pitch (if needed), length, standard, material grade, and finish.

FAQ

Q:How precise are the dimensions of your H High Efficiency Metric Square Head Bolts? Do they comply with ISO standards?

A:Our High Efficiency Metric Square Head Bolts are made with tight size limits, following the relevant ISO standards—mostly ISO 4017. That one’s mainly for hex bolts, but the head sizes work the same way. This makes sure the head width and height are consistent no matter the size, so they fit wrenches well and work smoothly when putting things together

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