Next-day UK delivery available
Order before 3pm — from £3.95
Same-day collection
Available from our North Shields store
Free returns within 30 days
Unused & original packaging
Spinlock
Spinlock Jammer Block Jk50
Professional-grade marine product — trusted by boaters across the UK.
£37.95
Tax included. View shipping policy
Next-day UK delivery available — order before 3pm
Same-day collection from our North Shields store
Expert advice — call 0191 414 0065
Klarna & PayPal available at checkout
The Spinlock Jammer Block JK50 is designed for reliable line holding and easy adjustments in marine applications, featuring a compact design, robust construction, and seamless operation, perfect for sails and halyard management.
The Spinlock Jammer Block JK50 is designed for reliable line holding and easy adjustments in marine applications, featuring a compact design, robust construction, and seamless operation, perfect for sails and halyard management.
Next-day UK delivery
Available on most items — order before 3pm. From £3.95.
Same-day collection — North Shields
Order online or call ahead — collect from our North Shields store today.
Free delivery over £100
Free standard delivery on all qualifying orders to UK mainland addresses.
Returns — 30 days
Unused, original packaging. Full returns policy →
Not sure which product you need? Call our team on 0191 414 0065
Looking for alternatives?
Browse our full range
Why buy from Marine Chandlery?
- UK marine specialists, based in North Shields
- Next-day UK delivery available
- Same-day collection from our store
- Expert advice before and after purchase
- Carefully selected marine-grade products
- Secure checkout & trusted payment options
Next-daydelivery
Same-daycollection
Securecheckout
Easyreturns
