Lewmar 60mm Synchro Block – Double with Becket, Black, 5/16”–3/8” Line
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Precision-Engineered for Speed and Low Friction
The Lewmar 60mm Synchro Double Block with Becket is built for sailors who demand smooth, efficient line handling under load. Its high-density, free-spin plain bearing and self-aligning swivel head minimize friction and keep lines running cleanly through every point of sail. The patented shackle post lock makes attachment and removal fast and secure — no tools required.
Constructed with stainless steel straps and glass-fibre reinforced cheeks, the Synchro series is engineered to handle the rigors of performance sailing while keeping weight low. The sheave, bearing, pin, and line size are matched for optimum mechanical efficiency across the 5/16”–3/8” line range.
Compatible Applications
- Mainsheet and traveler systems
- Vang and cunningham purchase systems
- Genoa and jib sheet blocks
- Running rigging on performance sailboats
- Line sizes: 5/16” to 3/8” (8–10mm)
- Block size: 60mm sheave diameter
Product Details
- Configuration: Double sheave with becket
- Sheave diameter: 60mm
- Line range: 5/16”–3/8” (8–10mm)
- 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: 239-29926005
Parts Desk Insights
Best Use Case: The double-with-becket configuration is the workhorse of purchase systems — pair it with a single block to build a 3:1 or 4:1 mechanical advantage for mainsheets, vangs, or cunninghams. The becket gives you the fixed attachment point needed to anchor the purchase system, while the double sheave handles the working and standing parts of the line. The 60mm size is well-suited to mid-size performance sailboats where the 50mm feels undersized but the 72mm adds unnecessary weight.
Other 60mm Synchro Blocks
- 60mm Synchro Block – Single, Black
- 60mm Synchro Block – Double, Black
- 60mm Synchro Block – Triple, Black
- 60mm Synchro Block – Single with Becket, Black
- 60mm Synchro Block – Triple with Becket & Cam, Black
- 60mm Synchro Block – Fiddle with Becket, Black
- 60mm Synchro Block – Fiddle with Cam, Black
- 60mm Synchro Halyard Block, Black
Other Synchro Block Sizes
- 50mm Synchro Blocks – 1/4”–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.