Metallics JMHTB6301 Bolts M6 x 30 C10.9 Hx Tap Blt St-zn (Jar 100)

It's a tap bolt, so the thread runs the full length of the shank right up to under the hex head. That matters when you're threading into a tapped hole, a nut insert, or a strut channel nut and need engagement anywhere along the 30mm length rather than at the tip only.

M6 diameter with a 1mm thread pitch, right-hand, in a 30mm length. That's standard M6 x 1 coarse metric, so any M6 coarse nut or M6 tapped hole will take it. Thread direction is right hand, tightening clockwise.

Strength. The JMHTB6301 is grade 10.9 heat-treated alloy steel, rated 150,800 psi minimum tensile and 136,300 psi minimum yield, with a hardness of Rockwell C32-39. A class 8.8 bolt won't reach those numbers. Use 10.9 where the connection is carrying real tensile load or high torque; for general light bracket work an 8.8 is normally enough.

No on both counts. These are not Buy American compliant and not ARRA compliant, with country of origin listed as multiple. If your project carries domestic sourcing requirements, this bolt won't satisfy them and you'll need a domestically produced fastener.

The finish is zinc plating over steel, which is a mild indoor and sheltered-location coating. It handles dry mechanical rooms, panel work, and interior hanger assemblies fine. For roof curbs, coastal exposure, or anything washed down regularly, step up to hot-dip galvanized or stainless; zinc plate will start to bloom and rust in those conditions.

They ship in a jar of 100 pieces, and the jar is the minimum order unit, so 100 is the smallest quantity. The filled jar weighs 827 g. Other sizes and quantities are available by request.

No. The jar contains the hex tap bolts only. The head does have an integral washer face underneath it, which spreads load slightly on a flat machined surface, but it is not a substitute for a flat washer on sheet metal or slotted strut. Order M6 nuts and washers separately.

Metallics lists them for electrical, plumbing, heating, and air conditioning work, which is where metric-threaded equipment feet, panel frames, and imported HVAC components turn up. The description also notes automotive and fleet use where class 10.9 tensile strength is required. If you're servicing imported mechanical equipment, metric hardware like this is usually what came out of it.

Metallics part number JMHTB6301, in the MHTB and JMHTB series of hex metric tap bolts. The J prefix indicates the jar pack of 100; the same bolt in the MHTB series designation covers other pack configurations.