NDakter Bike Chain Lock, Black, 4.27 ft Long, 0.24 in Thick, Heavy-Duty 5-Digit Combination with Sleeve

The NDakter Bike Chain Lock is a heavy-duty 5-digit combination chain that secures bikes, scooters, gates and equipment with a resettable, keyless locking cylinder and a scratch-proof cover.

If you need a versatile, visible deterrent that balances portability with robust materials, this NDakter chain lock offers a thick alloy-steel link construction, zinc-alloy locking cylinder and a weather-resistant protective sleeve. It comes in multiple lengths and thickness options so you can pick the size that fits your parking habits — from locking a single bicycle to looping multiple bikes or anchoring to fixed objects. The lock arrives set to 00000 and can be changed to any five-digit code for keyless convenience.

How does the combination system improve everyday use?

The five-digit mechanism gives far more unique combinations than common four-digit locks, lowering the chance of accidental matches and eliminating the need to carry a key. Resetting the code is straightforward, letting you update the number when you want more privacy or if you share the lock temporarily. The code-based cylinder is compact and designed for frequent set-and-release cycles.

• 5-digit resettable combination — 10,000 possible codes for better security.
• Keyless operation prevents lost-key problems and pocket clutter.
• Default code 00000; simple steps to set a custom number.
• Durable cylinder built to resist tampering under normal use.

What materials protect the chain from cutting or drilling?

NDakter uses alloy steel links chosen for tensile strength and drill resistance, and a zinc-alloy lock housing that increases resistance to prying and impact. While no lock is entirely impervious to determined thieves with power tools, the layered construction and metal grades make opportunistic theft much harder. The chain links are closely welded and finished to reduce vulnerable seams.

• Alloy-steel chain construction for better cut resistance.
• Zinc-alloy lock cylinder to resist drilling and forced entry attempts.
• Solid link welding to reduce weak points along the chain.
• Available thickness options (4/6 mm listed) to match security needs.

Will the chain damage my bike’s paint or feel uncomfortable to handle?

The chain is fully wrapped in a high-quality polypropylene fabric sheath that reduces scratches and scuffs on frames and components. The sleeve also helps block ice buildup in cold weather and provides a better grip when carrying or locking up. Because the fabric is wear-resistant, it prolongs the chain’s appearance while protecting your bike finish.

• Scratch-proof polypropylene cover protects frame paint and components.
• Wear-resistant material resists abrasion from daily use and transport.
• Insulating cover reduces cold metal contact in winter conditions.
• Neat fabric finish keeps the chain quieter when it rests against the frame.

Which length and thickness should I choose for my needs?

NDakter offers multiple lengths so you can lock one bike securely or loop around posts and several frames. For commuting and quick stops, a mid-length such as 4.27 ft is a practical compromise between reach and weight. Heavier or longer chains increase theft resistance but add carrying weight, so match length and thickness to how you travel and where you'll lock up.

• 2.62–6 ft lengths accommodate single bikes up to multiple-frame looping.
• Thicker links boost physical resistance but add weight for carry concerns.
• 4.27 ft (approx. 1.3 m) suits most everyday locking scenarios.
• Use longer chains for anchoring to large fixed objects or grouping bikes.

Who is this for? The NDakter Bike Chain Lock is aimed at cyclists, scooter owners and property users who want an easy-to-use, keyless security solution with a strong physical deterrent. It fits commuters, apartment dwellers, and homeowners who need a reliable, multi-purpose chain for bikes, gates, outdoor equipment and shared storage. Choose the length and thickness that match your parking habits and prioritize higher gauge links when you want extra peace of mind for longer public parking periods.