Ronstan Series 55 RT Orbit Block, Triple Becket Cleat Swivel
- Brand:
- Ronstan
- Part no:
- RF56330B
Image: velasailingsupply.com
Where to buy
Specifications
- Sheave diameter
- 55 mm
- Max line diameter
- 10 mm
- Weight
- 392 g
- Max working load
- 750 kg
- Breaking load
- 1500 kg
- Becket
- Yes
- Cam cleat
- Yes
- Swivel
- Swivel
- Manufacturer size
- Series 55
This is the Ronstan Series 55 RT Orbit block with a swivel shackle head, a cleat and triple beckets. The sheave is hard anodised aluminium, 55 mm across, and the cheeks are glass fibre reinforced nylon. The block weighs 392 g (13.8 oz). It takes rope up to 10 mm (3/8 in). The maximum working load is 750 kg (1650 lb) and the breaking load is 1500 kg (3300 lb).
Our take
Ronstan rates this 55 mm sheave block at a 750 kg working load and 1500 kg breaking load, at only 392 g. The swivel shackle head turns without limit and the integrated beckets sit low, so it works as a swivelling sheet block with cleating built in.
From our buying guide
Ball-bearing blocks give the lowest friction on lines running under moderate loads. Plain bearings have more friction, but handle very high and static loads.
Check before you buy:
- A ratchet block is rated for the full sheet load.
- Any becket's load limit suits the job, since a becket can be rated below the block itself.
- A soft-attach block will be looked after, since Harken warns soft attachments are prone to wear and recommends them only for regularly maintained race boats.