• Easily attached to any strong point with a strop
  • Hinged body can be opened and closed like a snatchblock
  • Acts as an emergency line clamp in case of winch or other hardware failure, jammed halyards, riding turns or damaged lines
  • Frees a winch for a sail change
  • Custom options include rig or deck mounting holes
  • Designed for use with ZS Rope Sense for load measuring and development projects

Lines: 8mm - 32mm (5/16" - 1 1/4")

Loads up to 7800kg (17,190lbs)


ZS0810/OPEN - 918g (32.4oz)

ZS1014/OPEN - 1349g (47.6oz)

ZS0810/OPEN - 2138g (75.4oz)

ZS0810/OPEN - 4150g (145.3oz)

ZS0810/OPEN - 6100g (213.5oz)


Use strop (not supplied) to attach ZS Open Jammer to a strong point on the deck

Orders received before 1200 UK time will be shipped the same day.

Orders shipping to UK address are sent on a next day delivery service. 

Orders shipping to addresses outside the UK are sent on 3-5 working day service.

All orders will receive a tracking number.

If you have any questions related to your delivery please contact orders@spinlock.co.uk

For full details please read our Terms & Conditions

ZS Open Jammer

The essential solution for peeling spinnakers, headsails, and reefing – unbeatable in an emergency

ZS Open Jammer, Lines 8-10mm
inc VAT
inc GST
inc Tax
inc VAT
inc Tax
ZS Open Jammer, Lines 10-14mm
inc VAT
inc GST
inc VAT
inc Tax
inc Tax
ZS Open Jammer, Lines 14-18mm
inc VAT
inc GST
inc Tax
inc VAT
inc Tax
ZS Open Jammer, Lines 18-24mm
ZS1824/OPEN - Not available for on-line purchase
ZS Open Jammer, Lines 26-32mm
ZS2632/OPEN - Not available for on-line purchase