608 bearing seat

The request

Make a seat plate for a 608 skateboard bearing (22 mm outer diameter, 7 mm wide). A 40 mm square plate, 10 mm thick, centred on the origin, lying flat in the XY plane with Z up. A 22.2 mm bore straight through the centre, with a 24.2 mm counterbore 4 mm deep from the top face so the bearing's outer race drops in and seats on the step. Four 4.4 mm through-holes at X = ±15, Y = ±15 for M4 bolts. Name the sub-part exactly `seat`.

What the AI judge checks

• A square plate of uniform outer thickness
• A central bore with a visible wider step at the top, not a plain straight hole
• Four small holes near the corners on a square pattern
• The central bore is open at the bottom face as well as the top
• Nothing added beyond the stepped bore and the four holes

Measured checks

• one sub-part named seat (gate)
• plate is 40 × 40 × 10
• through-bore is 22.2 mm in the lower band
• counterbore is 24.2 mm in the top 4 mm
• bore is still 22.2 just below the step
• counterbore reaches down to the step at 6 mm
• bolt hole at (15, 15) is 4.4 mm (gate)
• bolt hole at (15, -15) is 4.4 mm (gate)
• bolt hole at (-15, 15) is 4.4 mm (gate)
• bolt hole at (-15, -15) is 4.4 mm (gate)