List of Union Force binding hardware sizes.....
 

I lost the bolt for my ankle strap the other day, so I'm going to start carrying spare parts. I measured every bolt on my Union Force bindings to take the guess work out of it. Here is my list:

Toe Straps :
Buckle side - 10mm wide countersunk head, M4 x 5 mm threads, 8mm overall
Strap side 10mm wide panhead, M3 x 10mm threads

Ankle Straps:
Buckle side - 10mm wide countersunk head, M4 x 5 mm threads, 8mm overall (same bolt as toe strap)
Strap side - Thumb screw, M4 x 10mm, can use a panhead as replacement

High Back / Ankle Strap mounts:
Truss head, 13mm wide, M3 x 15mm, same on both sides

Heelcup mounting:
Truss head, 13mm wide, M4 x 13mm, same on both sides

High Back adjuster bolt:
Panhead, 10mm wide, M4 x 20mm

Footbed attachment:
Panhead, 10mm wide, M4 x 12mm