Lewmar 50mm Synchro Block – Fiddle with Cam, Black, 1/4”–3/8” Line
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Precision Control with Integrated Cam Cleat
The Lewmar 50mm Synchro Fiddle Block with Cam combines a high-performance fiddle block with an integrated cam cleat for fast, one-handed line control. The high-density, free-spin plain bearing and self-aligning swivel head minimize friction and keep lines running smoothly under load, while the cam cleat lets you lock off instantly without reaching for a separate cleat.
Built with stainless steel straps and glass-fibre reinforced cheeks, the Synchro series is engineered for the demands of performance sailing. The sheave, bearing, pin, and line size are precisely matched for optimum mechanical efficiency across the 1/4”–3/8” line range.
Compatible Applications
- Mainsheet systems requiring quick lock-off
- Vang and cunningham controls
- Spinnaker and jib sheet lead blocks
- Running rigging on performance and racing sailboats
- Line sizes: 1/4” to 3/8” (6–10mm)
- Block size: 50mm sheave diameter
Product Details
- Configuration: Fiddle with integrated cam cleat
- Sheave diameter: 50mm
- Line range: 1/4”–3/8” (6–10mm)
- Color: Black
- Bearing: High-density free-spin plain bearing
- Head: Self-aligning swivel
- Construction: Stainless steel straps, glass-fibre reinforced cheeks
- Attachment: Patented shackle post lock
- SKU: 239-29925037
Parts Desk Insights
Best Use Case: The fiddle-with-cam is the go-to block for any control line where you want to ease and cleat quickly without a separate cleat fitting. It’s especially popular for mainsheets on smaller performance boats and for vang systems where one-handed operation matters. The 50mm size is ideal for lighter-displacement boats and smaller rigs where the 60mm would be oversized. If you need a fixed-end attachment point for a purchase system, consider the Fiddle with Becket instead.
Other 50mm Synchro Blocks
- 50mm Synchro Block – Single, Black
- 50mm Synchro Block – Double, Black
- 50mm Synchro Block – Triple, Black
- 50mm Synchro Block – Single w/Becket, Black
- 50mm Synchro Block – Double with Becket, Black
- 50mm Synchro Block – Single with Becket & Cam, Black
- 50mm Synchro Block – Triple with Becket & Cam, Black
- 50mm Synchro Halyard Block, Black
- 50mm Synchro Block – Fiddle with Becket, Black
Other Synchro Block Sizes
- 60mm Synchro Blocks – 5/16”–3/8” Line
- 72mm Synchro Blocks – 3/8”–1/2” Line
- 90mm Synchro Blocks – 1/2”–9/16” Line
Pair It With
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.