The 16 mm is Harken’s smallest block. It is perfect for small synthetic control lines found on high-tech dinghies. The patented bearing system uses stainless steel balls in a captive grooved race and has a 250 lb (113 kg) maximum working load. The 404 uses an O-ring to keep the line in the sheave during intermittent loading.
Specification:
| Length (in) | 1 1/8 in |
| Weight (oz) | .33 oz |
| Sheave Ø (mm) | 16 mm |
| Sheave Ø (in) | 5/8 in |
| Length (mm) | 29 mm |
| Weight (g) | 10 g |
| Maximum line Ø (mm) | 5 mm |
| Maximum line Ø (in) | 7/32 in |
| Maximum working load (kg) | 113 kg |
| Maximum working load (lb) | 250 lb |
| Breaking load (kg) | 544 kg |
| Breaking load (lb) | 1200 lb |
