Metallics JMHTB1225 Bolts M12 X 25 C8.8 Hx Tap Blt St-zn (Jar 50)

It is an M12 x 25mm bolt with a 1.75mm thread pitch, right hand thread. That 1.75 pitch is the standard coarse metric thread for M12, so it mates with any standard coarse M12 nut or tapped M12 hole. Nothing fine-pitch about it.

Fully threaded. The threads on the shank run all the way up to directly beneath the head, which is what makes it a tap bolt rather than a partially threaded hex cap screw. Useful when you are threading into a tapped hole or a casting and want maximum thread engagement at a short 25mm length.

Grade (property class) 8.8, with a minimum tensile strength of 120,350 psi and minimum yield of 95,700 psi. Hardness runs Rockwell C23-34. It is medium carbon steel, heat treated, so it is a structural-duty fastener rather than a general purpose low-carbon bolt.

No. The JMHTB1225 is not Buy American compliant and is not ARRA compliant, and country of origin is listed as multiple. If your contract carries a domestic-sourcing clause, this bolt will not satisfy it and you need a domestically produced Class 8.8 or equivalent fastener.

No, and you should not mix them in a joint. Class 8.8 is the metric property class, M12 with 1.75mm coarse thread, so it will not thread into an SAE inch nut or tapped hole at all. Roughly, 8.8 sits in the same strength neighbourhood as SAE Grade 5, not Grade 8, with 120,350 psi minimum tensile here. If the existing hardware on the equipment is inch-thread, this is the wrong bolt.

The finish is zinc plating over steel. Zinc gives moderate corrosion protection and is fine for indoor mechanical, electrical, HVAC and plumbing work and protected exterior use. For constant wet exposure, washdown, or coastal conditions, go to stainless instead; zinc plating will eventually sacrifice and the steel underneath will rust.

The hex head is formed with a washer face beneath it, so it already presents a flat bearing surface against the joint. On a clean machined or flat steel surface you can run it as-is. Over soft material, oversized holes, or slotted channel you still want a flat washer to spread the load.

The JMHTB1225 ships as a jar of 50 pieces, and 50 each is the order minimum, so it sells by the full jar rather than loose count. The packed jar weighs 1597 g. Other sizes and quantities are available by request.

The common use is mounting a motor to machinery, and it is also widely used in automotive and truck repair. In the trades it shows up across electrical, plumbing, heating and air conditioning work: equipment feet, pump and blower mounts, bracket and frame bolting into tapped holes. At 25mm it is a short bolt, so it suits bolting a bracket or flange to a threaded boss, not stacking thick members.