Metallics JMHTB525 Bolts M5 x 25 C8.8 Hx Tap Blt St-zn (Jar 100)

It's an M5 metric bolt, 25mm long, with a 0.8mm thread pitch and right-hand threads. That is the standard coarse pitch for M5, so it mates with M5 coarse nuts and tapped M5 holes. Because it's a tap bolt, the thread runs the full length of the shank right up under the head, so it will pull up tight in a blind tapped hole of any depth up to 25mm.

Class 8.8 is the medium-carbon, heat-treated grade used for most machinery mounting work: 120,350 psi minimum tensile, 95,700 psi minimum yield, hardness Rockwell C23-34. Metallics lists motor-to-machinery mounting as a primary use, along with automotive and truck repair. It is a structural-duty fastener, not a general hardware-store bolt, but at M5 the load capacity is limited by the small diameter, not the grade.

No. These are sourced from multiple countries of origin and Metallics lists them as neither Buy American compliant nor ARRA compliant. If you are on a federally funded project with domestic sourcing language in the spec, you need a domestically produced fastener instead.

The finish is zinc plating over steel, which handles indoor and sheltered conditions, condensation in a mechanical room, and general MRO work. It is not stainless. For sustained outdoor exposure, coastal air, or anywhere standing water sits on the head, zinc plating will eventually rust through and a stainless or hot dip option is the better call.

These ship as a jar of 100 pieces, and the jar is the minimum order unit. Total packed weight is about 440 g. The jar packaging suits a service van or a shop bin where you want the count contained rather than loose in a tray.

A tap bolt is threaded all the way to the underside of the head instead of carrying a plain shoulder. That matters when you are threading into a tapped hole of uncertain depth or clamping a thin stack, because a partially threaded bolt can bottom its shank on the material and never actually clamp. The JMHTB525 is the full-thread version, M5 x 25mm, with a washer face under the hex head to spread bearing load.

Metallics lists these for the electrical, plumbing, heating and air conditioning trades. Typical uses are mounting motors to machinery, securing equipment feet and brackets, and automotive or truck repair. For an MRO crib servicing rooftop units, pumps and panel enclosures, a jar of 100 M5 x 25 Class 8.8 covers the small metric fastener gap that imperial stock leaves open.