Lewmar 50mm Synchro Fiddle Block – 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.
Smooth, Efficient Multi-Part Line Handling
The Lewmar 50mm Synchro Fiddle Block delivers the clean, low-friction performance of the Synchro series in a versatile fiddle configuration. Two sheaves in a staggered arrangement allow you to run two lines through a single block — ideal for multi-part purchase systems and anywhere you need to keep your rigging compact and efficient. The high-density, free-spin plain bearing and self-aligning swivel head minimize friction under load, while the patented shackle post lock makes attachment fast and tool-free.
Stainless steel straps and glass-fibre reinforced cheeks keep the block light and durable through seasons of hard use.
Compatible Applications
- Multi-part mainsheet and vang purchase systems
- Genoa and jib sheet systems requiring two-line leads
- Running rigging on performance dinghies and keelboats
- Control line systems where a compact two-sheave block is needed
- Line sizes: 1/4” to 3/8” (6–8mm)
- Block size: 50mm sheave diameter
Product Details
- Configuration: Fiddle (double sheave, staggered)
- Sheave diameter: 50mm
- Line range: 1/4”–3/8” (6–8mm)
- 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: 239-29925031BK
Parts Desk Insights
Best Use Case: The plain fiddle block is the right choice when you need a two-sheave block without the added weight or complexity of a cam or becket — use it as the working end of a purchase system or anywhere you need to run two lines through one point. It’s a clean, lightweight option for dinghies and small keelboats in the 16–26 ft range. If you need a lock-off, step up to the Fiddle with Cam; for a complete purchase system anchor, choose the Fiddle with Becket or Fiddle with Cam & Becket.
Other 50mm Synchro Blocks
- 50mm Synchro Block – Single, Black
- 50mm Synchro Block – Double, Black
- 50mm Synchro Block – Triple, 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
- 50mm Synchro Block – Fiddle with Cam, Black
- 50mm Synchro Fiddle Block – Cam & 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.