3M 7000133343 3M™ Scotchlok™ Block Fork Vinyl Insulated, 50/bottle, MV10-10FBX, suitable for use in a terminal block, 500/Case

The MV10-10FBX block fork terminal is sized for 12 to 10 AWG stranded copper (3.31 to 5.26 mm2). The barrel inside diameter is 0.135 inch, so a conductor larger than 10 AWG will not seat. Yellow insulation is the color code used on this gauge range, which is how you spot it in a mixed bin on the truck.

It is made for a #10 stud or screw. The fork opening clearance is 0.29 inch, so it slips over a #10 terminal screw without backing the screw all the way out. Overall the tongue plus barrel runs 1.03 inches long by 0.32 inch wide, which is what you need to check against tight terminal block spacing.

Yes, 600 V is the maximum recommended voltage for the MV10-10FBX, and it carries a UL file number of E23438. That covers typical motor control, panelboard, and equipment control terminations. Operating temperature tops out at 105 C (221 F), so keep it out of high-heat locations beyond that.

A block fork has a squared, shouldered tongue instead of the tapered one on a standard spade. That shoulder sits flat under the pressure plate of a terminal block and resists pulling out sideways, which is why 3M lists the MV10-10FBX for terminal block use. A ring terminal is more secure still since it cannot back off the stud, but it forces you to remove the screw completely. Use the fork when you want to land wires on a block quickly without pulling every screw.

The vinyl sleeve on this Scotchlok fork accepts conductor insulation up to 0.25 inch outer diameter. The sleeve is funnel shaped at the entry, so a stranded 12 or 10 AWG conductor pushes in without brooming the strands. Anything with a jacket fatter than 0.25 inch will not enter the sleeve.

Both. The MV10-10FBX is RoHS 2011/65/EU compliant without exemption and is manufactured in the United States, which is the pair of answers institutional and government procurement usually needs before a PO clears.

The barrel is brazed seam ETP copper. A brazed seam closes the barrel so it does not split open under the crimp die the way a plain butted seam can, and ETP copper gives you the conductivity you want on a current-carrying termination. Crimp with a die matched to 12-10 AWG insulated terminals.

They ship 50 per bottle, 500 per case. The bottle packaging keeps them from scattering in a gang box or van drawer, which is the practical reason panel shops buy these over bagged terminals.