Stand-up bases allow a wide variety of blocks to be held upright, swivel freely, or pivot so lines have a fairlead under load. Use the 1634 stand-up base with Midrange blocks and 57 mm or 75 mm Cruising ESP blocks. Block headpost fits into socket without shackle.

Height (mm)
49 mm

Height (in)
1 15/16 in

Weight (g)
255 g

Weight (oz)
9 oz

Base Ø (mm)
73 mm

Base Ø (in)
2 7/8 in

Inside socket Ø (mm)
15 mm

Inside socket Ø (in)
9/16 in

Pin Ø (mm)
8 mm

Pin Ø (in)
5/16 in

Fasteners (mm)
6 RH mm

Fasteners (in)
1/4 RH in

Maximum working load (kg)
1588 kg

Maximum working load (lb)
3500 lb

Breaking load (kg)
3175 kg

Breaking load (lb)
7000 lb

Use with
Midrange / Cruising ESP