Carbon Steel Metric Square Head Bolts

Carbon Steel Metric Square Head Bolts, commonly used in construction, woodworking, and older machinery applications, offer a vintage or heavy-duty aesthetic. For Xiaoguo®—an experienced supplier of fasteners—consistent product quality of such bolts is a core commitment.

Model:ASME/ANSI B18.2.1-1-1972

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Product Description

How well Carbon Steel Metric Square Head Bolts hold up mostly depends on their material grade. Common carbon steel grades are 4.6 (they can take at least 400 MPa when pulled), 5.6 (500 MPa), 8.8 (800 MPa), 10.9 (1000 MPa), and 12.9 (1200 MPa).

Common stainless steels such as A2-304 and A4-316 have a very practical feature - they are not easy to rust. However, they have a small limitation, which is that the tensile force they can withstand is generally not very high, usually in the range of 500 to 700 MPa. The higher-grade metric square head bolts (8.8 and above) are heat-treated to make them stronger.

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

To put in Carbon Steel Metric Square Head Bolts, you need the right size open-end wrenches, adjustable wrenches, or special square sockets. Getting them tight enough but not too much matters—you’ve got to follow the suggested torque numbers. These go by the bolt’s diameter, material grade, thread pitch, and whether it’s lubricated.

Engineering Operation Scenario (Details Supplement) If the connection is not tightened according to the standard torque (or "if the tightening degree does not meet the standard"), the connection will likely become loose later, requiring secondary inspection and reinforcement. When the bolt tightening torque exceeds the specified value, it is easy to cause the bolt to plastically stretch or directly break. To ensure the stability of the connection and prevent bolt failure, the torque guidance documents issued by the manufacturer or engineering department must be strictly followed.

FAQ

Q: What wrench size is required for installing Carbon Steel Metric Square Head Bolts? Is it the same as the thread size?

A:The wrench size (the width across the flat parts) for Carbon Steel Metric Square Head Bolts is bigger than the thread diameter. For example, a metric square head bolt like M12 can usually be tightened with a 19mm wrench. But don't just use it directly. You must first consult the specific size chart of the bolt and find the right wrench before installing and tightening it.

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