Heininger 5/8" Threaded Pin Hitch Lock 6001 – 11 TPI Threaded Receiver Lock, Weather-Resistant 5.75"

The Heininger 5/8" threaded pin hitch lock (model 6001) is a weather-resistant, anti-theft threaded pin designed to secure compatible Heininger trailer hitches and accessories in 2" x 2" receiver applications.

If you own a Heininger HitchMate, PortablePET Twistep, Advantage Hitch Extension or Advantage Tilt AWAY, this threaded pin lock is built specifically to match those products’ 5/8" (11 TPI) bolt requirements. It provides a keyed locking head and two keys, a compact 5.75" total length, and a design intended for 2" x 2" class III/IV receivers. Note: thread pitch and diameter are crucial — this lock was engineered for Heininger parts and may not fit other brands.

How do I confirm this lock fits my hitch or accessory?

Measure both the pin diameter and the thread pitch of your existing hitch bolt before purchasing. The Heininger 6001 uses a 5/8" diameter pin with 11 threads per inch; mismatched threads will prevent engagement and can damage components.

• Verify pin hole diameter: 5/8" (0.625 in)
• Check thread pitch: 11 threads per inch (11 TPI)
• Confirm receiver size: 2" x 2" (class III or IV)
• Compare model compatibility: fits specified Heininger models listed by the brand

What security and weather protection does the lock provide?

This threaded pin includes a keyed locking head and comes with two keys for convenience. The head is weather-resistant to reduce corrosion risk from rain and road spray, though periodic maintenance will extend service life.

• Anti-theft keyed lock mechanism with two keys included
• Weather-resistant locking head to resist moisture
• Threaded engagement reduces accidental release compared to pins without threads
• Compact 5.75" length suited for common hitch setups

Which Heininger products are compatible with this pin?

The 6001 threaded pin is made to fit a set of Heininger accessories that use the same 5/8" x 11 TPI bolt specification. It will not function with parts that use different thread measurements or with certain models explicitly excluded by Heininger.

• Compatible: HitchMate Truck Step XL (#4037)
• Compatible: PortablePET Truck Twistep (#3045)
• Compatible: Advantage Hitch Extension (#6000)
• Compatible: Advantage Tilt AWAY (#3010); NOT compatible with SUV Twistep #3052

Can I use this lock with other brands like Thule?

No — this threaded pin is tailored to Heininger thread standards and will not work with many other manufacturers. If you need a replacement for a different brand, check that brand’s specified pin diameter and thread pitch or purchase their recommended locking part.

• Does not fit Thule bike racks; look for the brand-specific Thule lock
• May not work with other bike rack brands due to thread differences
• Incorrect thread engagement can cause cross-threading and damage

Who is this for: The Heininger 5/8" Threaded Pin Hitch Lock 6001 is intended for vehicle owners who already have compatible Heininger steps, bike racks or hitch accessories and want a keyed, threaded locking solution matched to those products. Choose this part when your accessory specifies a 5/8" diameter with 11 TPI and you use a 2" x 2" receiver; if your setup uses different threads or another brand, select the appropriate manufacturer-specific lock instead.