Single block 40mm snap shackle | Master Optimist
Master block series specifically adapted for the Optimist dinghy.
Ball-bearing 40 mm single block with quick-release, adapted for the mainsheet system on the Optimist dinghy. The quick-release makes it easy to detach and reattach the block.
AREA OF USE
The single block is used in the mainsheet system on the Optimist dinghy, where the quick-release makes it easy to rig and de-rig the boat.
TECHNICAL SPECIFICATIONS
Dimensions and loads
- Max. line Ø: 8mm
- Weight: 78g
- Working load: 230kg
- Breaking load: 800kg
Material
- Sheave: self-lubricating acetal composite
- Ball bearings: self-lubricating acetal composite
- Side plates/frames: reinforced fiberglass nylon composite with UV stabilization
- Shackle: Forged stainless steel grade A4/AISI316
FREQUENTLY ASKED QUESTIONS (FAQ)
What line diameter fits the block?
The block has a 40 mm sheave and fits lines up to 8 mm in diameter.
What is the difference between working load and breaking load?
The working load is the load the block is intended to be used with continuously. The breaking load is the load at which the block will fail and should never be used as a design value.
Does the block need to be lubricated?
No, the sheave and ball bearings are made of self-lubricating acetal composite. We recommend rinsing the block with fresh water after use in saltwater.