Proven Industries 2-Inch Trailer Coupler Lock S175 — Heavy-Duty Stainless Pin, Pick-Resistant

Proven Locks S175 is a heavy-duty 2-inch trailer coupler lock that secures trailers, boats, and RVs with a stainless steel pin inside a ductile iron housing and a pick-resistant key system.

When you park a trailer, boat, or RV, the coupler is one of the most vulnerable points. The Proven Locks S175 Trailer Coupler Lock is built specifically for trailers with 2-inch couplers and combines robust materials with an intentionally designed key system to make unauthorized detachment difficult. This product description explains what the lock is, how it fits, and the practical benefits you can expect when protecting your equipment.

How does the S175 lock attach to a 2-inch trailer coupler?

The S175 is shaped to mount directly over compatible 2-inch couplers and secures by inserting a solid locking pin through the coupler. Once in place, the lock blocks the coupler latch and prevents the hitch ball from being inserted or lifted off.

• Fits select standard 2-inch trailer couplers—verify dimensions before purchase.
• Locking pin passes through coupler opening to prevent hitch engagement.
• Exterior cover shields the mechanism from tampering and weather.

What materials and construction make this lock sturdy?

The S175 uses a solid stainless steel pin for internal strength and a ductile iron outer shell to resist impact and cutting attempts. The visible cover is finished with black powder coating to add corrosion resistance and a tougher surface against forced entry tools.

• Stainless steel internal locking pin for tensile strength and rust resistance.
• Ductile iron housing absorbs impacts better than brittle metals.
• Powder-coated exterior reduces corrosion and disguises wear.

How does the key design reduce tampering risk?

The lock employs a specially designed key and internal mechanism intended to make picking and unauthorized duplication more difficult. An internal locking profile and restricted key geometry add a layer of mechanical control that deters common illicit entry methods.

• Unique key profile limits easy duplication at ordinary key cutters.
• Interior locking components are not exposed, reducing pick access.
• Supplied keys operate the lock while preventing simple bypass tools from engaging.

What should I confirm before ordering the S175?

Because the S175 is made for specific coupler sizes and shapes, measure your coupler before buying. Ensure your trailer’s coupler matches the 2-inch specification and that there is sufficient clearance for the lock body to close around the coupler.

• Measure coupler opening and overall latch profile for compatibility.
• Confirm you have a standard 2-inch coupler—not an alternate size or adapter.
• Check for obstruction from wiring or accessories that could block installation.

Who this is for: The Proven Locks S175 is designed for boat owners, RV owners, and trailer operators who need a purpose-built mechanical coupler lock for standard 2-inch trailer couplers. If you tow frequently, store a trailer in public areas, or want an extra barrier against unauthorized hitching, this lock provides a durable, fit-specific solution. It suits buyers who prefer a physical deterrent made from robust materials with a more secure key system than generic padlocks or simple latch clips.