FullStop Torpedo Locking Hitch Pin – Suits Articulating Poly Block Couplings (SKU: THP100)

The FullStop Torpedo Hitch Pin Lock (THP100) is a compact yet highly secure locking solution, specially designed for articulating poly block trailer couplings. If you’re towing with a setup that demands flexibility and strength, this torpedo-shaped lock gives you the peace of mind you need—without overcomplicating the job.

Made with FullStop’s trusted focus on Australian towing conditions, the Torpedo Lock is ideal for Class 4 receivers up to 75mm wide and uses a 5/8″ (16mm) diameter pin for tight, no-wobble fitment. Whether you’re off-roading with a camper trailer or locking up a work trailer at the job site, this pin provides essential anti-theft protection in a durable and compact form.

Key Features:

• Compatible with most articulating poly block couplings
• Fits Class 4 receivers up to 75mm wide
• 5/8″ (16mm) diameter locking hitch pin – strong and secure
• Includes 2 high-quality keys for simple locking and unlocking
• Designed in Australia for rugged conditions
• Durable construction with smooth lock mechanism

This lock is the perfect solution for:

• Off-road trailer setups using poly block hitches
• Utility and work trailers needing compact, no-nonsense locking
• Caravans or campers with Class 4 receiver hitches

Installation Tips:

• Make sure your receiver width is 75mm or less
• Align the pin with the coupling holes and slide it through completely
• Engage the lock and test for any slack – a tight fit ensures maximum protection
• Keep one key on you and store the spare separately for backup

If you’re looking for a compact, strong, and easy-to-use hitch security solution for your poly block setup—the FullStop Torpedo delivers.