Ronstan Series 55 RT Orbit Block, Single Swivel Head, RF56100
- Brand:
- Ronstan
- Part no:
- RF56100
Image: mauripro.com
Where to buy
View on Amazonpaid link
Specifications
- Sheave diameter
- 55 mm
- Max line diameter
- 10 mm
- Bearing
- Ball
- Weight
- 82 g
- Max working load
- 250 kg
- Breaking load
- 750 kg
- Sheaves
- 1
- Swivel
- Swivel
This is a single Ronstan Series 55 RT Orbit block with a swivel shackle head. It has a 55 mm sheave and takes rope up to 10 mm, and it weighs 82 g. It has both automatic and manual ratchet modes. Maximum working load is 250 kg, and breaking load is 750 kg. The maker aims it at dinghies and small keelboats up to 8 m (26 ft).
Our take
The 250 kg maximum working load, with a 750 kg breaking load, sets what this 82 g block can carry, and the 10 mm line limit goes with it. The maker aims it at dinghies and small keelboats up to 8 m, so treat that as its intended range.
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.