Abus Ultimate 420K

$108.99

In Stock

ABUS Ultimate 420K U‑Lock delivers high-security, low-rattle performance with a 14mm hardened shackle, double-bolt locking and Sold Secure Gold approval—ideal for daily commuting.

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Product Details

Overview & Technology

The ABUS Ultimate 420K is a compact, high-security U-lock engineered to protect bikes in urban and commuter environments. It pairs a 14mm round, hardened steel shackle with a robust, hardened lock body and a double-bolt locking mechanism to resist cutting, levering and twisting attacks. The 420K uses refined internal components and an improved chassis design to reduce rattling while riding and to extend service life. Certified to Sold Secure Gold standards, this lock is built for riders who want a light, compact lock without compromising proven protection.

Key Features

Materials and construction: The shackle is 14mm diameter, heat-treated, round hardened steel for high cut and pry resistance. The lock body is hardened and reinforced to protect the cylinder and locking bolts from impact and manipulation. • Double-bolt locking secures the shackle at both ends for improved anti-lever performance. • USH bracket (fits 24–35mm tubes) for tidy frame mounting and quick access. • Sold Secure Gold approval confirms high-level security tested by independent labs. • Improved chassis reduces rattling and vibration on rough roads.

Fit & Compatibility

The internal lock size is 150 x 230 mm (5.9" x 9"), giving a practical balance between coverage and portability: big enough to secure frame and rear wheel to many fixed objects, small enough to mount securely on most frames. The USH mounting bracket is designed for round and aero tubes from 24mm up to 35mm diameter, covering most modern road and commuter frames. If you need to lock both wheels and the frame to a post, pair the Ultimate 420K with a secondary cable or chain to loop through the front wheel. The key lock type offers a simple, reliable interface and includes keyed operation with spare keys available through ABUS.

Who It's For

This U-lock is aimed at commuters, city riders and road cyclists who want a compact, highly secure lock that’s easy to carry. It’s especially well suited for riders parking in busy urban areas or leaving bikes in short-term public parking where a high security rating matters. Also a great option for riders of higher-value bikes who prefer a keyed lock with minimal rattling and a tidy mounting solution. If you regularly need to secure two wheels plus frame to immovable objects, consider combining the 420K with a lightweight security cable.

Key Features

✓ 14mm round, heat-treated hardened steel shackle for cut resistance
✓ Double-bolt locking secures both ends of the shackle
✓ Sold Secure Gold approval for high-level independent security
✓ Hardened lock body resists impact and drilling attempts
✓ USH mounting bracket fits 24–35mm frame tubes for tidy mounting
✓ Compact 150 x 230 mm internal size balances security and portability
✓ Improved chassis design reduces rattling on rough roads

Specifications

Bracket	USH
Internal Lock Size Metric	150x230mm
Lock Type	Key
Primary Color	Red
Thickness In mm	14mm
Internal Lock Size Imperial	5.9''x9''

Product Identifiers

Vendor Item #	94377
EAN	4003318943775

Frequently Asked Questions

What makes the Ultimate 420K more secure than a basic padlock?

The 420K uses a 14mm hardened steel shackle and a reinforced lock body with double-bolt locking, which dramatically increases resistance to cutting and leverage attacks versus basic padlocks. Additionally, its Sold Secure Gold certification means it passed rigorous independent testing for real-world security threats.

Will the USH bracket fit my bike frame?

The included USH bracket is designed for tube diameters between 24mm and 35mm, covering most modern road, commuter and hybrid frames. If your frame has larger seat tubes or unusual shapes, you may need an alternative mounting option or to carry the lock in a bag.

Can I lock both wheels and the frame with this U-lock?

The 150 x 230 mm internal size allows you to secure the frame and rear wheel to many bike racks and posts, but it may not reach both wheels on all bikes. For full protection, we recommend pairing the 420K with a secondary cable to loop through the front wheel when needed.

Is the lock weather-resistant for year-round use?

Yes—the 420K features a weather-resistant finish on the lock body and a protective outer coating to reduce corrosion and protect paintwork. Routine care, like occasional lubrication of the keyway, will keep the mechanism operating smoothly through wet seasons.

What are the lock’s physical dimensions and weight?

Internal clearance measures 150 x 230 mm (5.9" x 9"). Shipping dimensions are approx. 7.25" x 3" x 11.5" and the lock weighs about 3.4 lb, making it robust yet still portable for daily commuting when mounted.

Can I get spare keys or rekey the lock?

Spare keys are generally available from ABUS dealers or through ABUS customer service using the lock’s key code. Rekeying is not a typical DIY option; contact ABUS or an authorized locksmith for key replacement or master-keying services.

Buying Guide

When choosing a U-lock, prioritize shackle thickness, material hardness and independent security ratings. A 14mm hardened shackle like the ABUS Ultimate 420K strikes a strong balance between portability and protection for urban riders; thicker shackles increase security but add weight. Match the internal size to how you plan to lock: smaller shackles are lighter and harder to attack but offer less clearance. For maximum everyday protection, combine a U-lock with a lightweight security cable to secure both wheels, and choose a lock with a quality mounting bracket or carry option that you will actually use.

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