12 Point Flange Bolt

Xiaoguo® 12 Point Flange Bolt have multiple serrations on the bottom surface, which enhance friction, prevent loosening, and resist vibration. We offer custom 12 Point Flange Bolt to meet different standards and project requirements.

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Product Description

Using this 12 Point Flange Bolt is pretty simple, and you don’t need any special tools for most standard jobs. First, line up the pre-drilled holes on the parts you want to connect, and make sure everything lays flat with no gaps. Push the fastener straight through the holes, with the 12-point head facing out so you can reach it easily. Use a 12-point socket wrench that fits the head size to tighten it; try not to use adjustable wrenches, since they can slip and damage the head. Twist it clockwise slowly to apply even pressure, and stop once it’s tight—don’t over-tighten, because that can ruin the threads or bend the flange base. The built-in flange works like a washer, so you won’t need to add extra ones most of the time. For the best results, use it on clean, flat surfaces, and check that the threads aren’t damaged before you start installing. This easy process works for machinery assembly, auto repairs, and general construction work.

Product surface treatment

This 12 Point Flange Bolt gets simple surface treatments to make it last longer and stand up to daily use. The most common finish is zinc plating, which puts a thin protective coat on the steel to slow down rust and corrosion in normal working conditions. Another standard choice is black oxide, which offers light corrosion resistance and a smooth, matte surface that works well for indoor or covered outdoor use. These coatings are applied evenly all over the fastener, including the threads and the flange base, to make sure protection is consistent. We don’t use any fancy or thick coatings—just practical finishes that meet basic industrial needs, and hold up under regular use, vibration, and slight moisture. The surface is smooth with no rough spots or uneven layers, so it goes in easily without catching on holes or scratching other parts. These treatments are tested to last for everyday use without chipping or peeling too soon.

Mon	M5	M6	M8	M10	M12	M14	M16	M20
P	0.8	1	1.25	1.5	1.75	2	2	2.5
ds max	5	6	8	10	12	14	16	20
ds min	4.82	5.82	7.78	9.78	11.73	13.73	15.73	19.67
dc max	9.4	11.3	15	18.6	22.8	26.4	30.3	37.4
h min	1.7	2.1	2.7	3.4	4.1	4.8	5.7	7.2
k max	5	6	8	10	12	14	16	20
d1 max	5.86	7.02	9.37	11.7	14.04	16.29	18.71	23.4
d1 min	5.71	6.82	9.17	11.5	13.84	16.06	18.48	23.17
d2 max	5.22	6.26	8.34	10.42	12.5	14.59	16.66	20.83
d2 min	5.07	6.06	8.14	10.22	12.3	14.36	16.43	20.6
da max	6.1	7.4	10.1	12.5	15.7	18.1	20.5	26.1
Lf max	1.4	1.6	2.1	2.1	2.1	2.1	3.2	4.2
r max	0.25	0.29	0.36	0.45	0.54	0.63	0.72	0.9
r min	0.1	0.12	0.16	0.2	0.24	0.28	0.32	0.4
ds1 max	4.54	5.39	7.26	9.08	10.95	12.77	14.77	18.49
ds1 min	4.36	5.21	7.04	8.86	10.68	12.5	14.5	18.16
L1 max	3.5	4	5	6	7	8	9	11
L1 min	2.5	3	4	5	6	7	8	10

Q&A session

What surface treatment methods can you offer for the 12 Point Flange Bolt to enhance their corrosion resistance?

We provide various surface finishes to suit different environments. Options include zinc plating (yellow/clear), black oxide, and hot-dip galvanizing. Zinc plating offers basic protection for dry indoor use, while hot-dip galvanizing is suitable for outdoor and marine conditions to prevent rust and corrosion.