Rear Carrier Bolt

The NUT [NB03 REAR CARRIER BOLT] is a specialized heavy-duty cargo rack and carrier plate fastener set designed for electric scooters, e-bikes, mopeds, and light electric vehicles (LEVs). Installed at the rear chassis subframe mounting points, it locks rear passenger grab handles, delivery cargo racks, top-box mounting plates, and body support stays securely to the vehicle frame.

Constructed from high-tensile steel alloy with an anti-corrosion protective finish, this NB03-series bolt and nut set withstands severe dynamic shear forces, heavy payload stress, and continuous rear axle road vibration. Operating independently across 12V to 60V DC electric vehicle architectures, its precise thread engagement prevents fastener backing-off, protecting the rear frame against structural fatigue and loose cargo box rattle.

Key Features

• NB03 Series Heavy-Duty Threading: Precision-machined metric thread profile engineered specifically for load-bearing rear frame stays and carrier racks.
• High-Tensile Steel Alloy Construction: Built to withstand severe shear stress, heavy delivery loads, and physical impact without stretching or shearing.
• Corrosion & Rust Protective Plating: Surface-treated electro-plating protects against rain, road splash, mud, and moisture exposure.
• Vibration-Resistant Clamping Force: Maintains tight mechanical torque on rear carrier brackets to eliminate cargo movement and chassis rattle.
• Standard EV Workshop Compatibility: Hex head drive fits standard shop wrenches and socket sets for quick installation and maintenance.

1x NUT [NB03 REAR CARRIER BOLT] Set (high-tensile metric nut and matching heavy-duty bolt unit)

Suitable Vehicle Types & Applications

• Commercial Delivery & Fleet EVs: Heavy-duty rear cargo rack fastener for delivery e-scooters and utility cargo bikes carrying top boxes or thermal bags.
• Electric Scooters & Mopeds: Primary grab rail and passenger luggage rack mounting hardware for 48V–60V e-scooters.
• Frame Maintenance & Repairs: Essential replacement component for rusted, stripped, or missing rear carrier frame bolts.

System & Electrical Compatibility

• Universal Rear Frame Stays & Carrier Plates: Fully compatible with standard NB03 metric subframe mounting tabs, rear rack stays, and passenger grab handles.
• Wide EV Sub-Circuits: Operates independently of electrical system voltage across 12V to 60V DC vehicle platforms.

1. Isolate Power & Align Rear Cargo Rack:

Turn off key ignition, trip the main DC circuit breaker, and position the rear luggage rack or grab handle onto the chassis subframe mounting tabs.

Verification: Vehicle is completely unpowered and the carrier bracket mounting holes align cleanly with the frame brackets.

2. Clean Frame Mounts & Insert NB03 Bolt:

Wipe dirt, grit, and rust away from the frame mounting holes. Insert the NB03 carrier bolt through the rack bracket and frame tab, then thread the matching nut on by hand.

Verification: The bolt passes fully through both mounting plates without forcing or cross-threading the nut.

3. Torque Fastener Firmly to Specification:

Hold the bolt head with a wrench while tightening the NUT [NB03 REAR CARRIER BOLT] securely with a socket. Apply medium-strength threadlocker if subjected to heavy commercial loads.

Verification: Fastener sits flush and fully torqued against the carrier bracket face without stripping or slipping.

4. Test Luggage Rack Rigidity:

Apply downward and lateral hand force onto the rear carrier or top-box plate 3–4 times to test structural rigidity.

Verification: The rear carrier remains rigidly locked to the frame with zero flexing, looseness, or metal clunking.

Power Isolation: Always turn off ignition, trip main DC circuit breaker, and secure vehicle before inspecting chassis hardware.

Periodic Torque Checks: Inspect rear carrier bolt tightness during routine 3,000 km periodic servicing, especially on heavy-duty delivery fleet vehicles.

Rust Protection: Apply a light film of protective grease or anti-seize over exposed external threads to prevent corrosion caused by rain and road spray.