Collection boxes
- for dull blades
- special closure
- in 4 sizes
Safety level 3 | test winner BoxCutter test 2025 | no blade change
Art. no. US53
At a glance
Prices in EUR, net – for business customers only. Shipping: €14 flat rate within Europe, free of charge from €300 goods value (Shipping costs, in German) · Delivery time on request
| Quantity discount | net / pc. |
|---|---|
| from 20 pcs. (−3 %) | 2.04€ |
| from 50 pcs. (−6 %) | 1.97€ |
Cutting depth 5.5 mm | plastic housing | tape slitter
Tortoris US53 is a safety level 3 safety knife with a concealed blade. Finger contact with the blade is not possible before, during or after the cut.
The housing of the US53 is made of high-quality glass-fibre-reinforced plastic and is particularly ergonomically shaped – the knife is therefore designed for frequent use of up to 1,000 cuts per day.
The US53 can be operated from both sides and is suitable for right- and left-handed users without conversion. At only 12 g it belongs to the featherweight category and therefore sits particularly lightly in the hand.
The Tortoris US53 is universally applicable for opening cartons, film and strapping, but is especially suited to use in logistics, shipping and warehousing. Safety knives overview
The Tortoris US53 is designed for films, strapping and adhesive tape – and, unlike many BoxCutters, also opens corrugated board very well. The somewhat wider cutting channel ensures high safety but is not suitable for thick or bulky materials such as polystyrene, rubber or ropes.
Level 3 safety knives keep the blade permanently concealed – it does not get safer than that. The Tortoris US53 shows how much performance there still is in this design: from the concave-ground hook blade from Solingen and the low cutting force to the well-thought-out cutting channel. Here you can see at a glance what makes the 2025 test winner – and where its limits lie.
Concealed blade — stays hidden in the housing throughout and protrudes only minimally for the cut. Maximum protection during operation.
All safety levels explained →Adjustable cutting depth: no.
glass-fibre-reinforced plastic, considerably more break-resistant than ordinary plastic at a similar weight.
All the key data on the Tortoris US53 at a glance: the product flyer brings together the level 3 safety features, the results from the BoxCutter test and the typical areas of application in a compact PDF. This gives purchasing, occupational safety and team leaders the most important arguments to hand – free of charge and without registration.
Technical data, blade change instructions and safety notes – DIN A4
Download →The Tortoris US53 is the overall winner among the BoxCutters – maximum cutting performance with the highest safety. If you prefer the established best-value classic with a stainless steel blade, you will find it in the OLFA SK-15. And if you want to change the blade instead of replacing the entire knife, the CB100 is the right choice. Here you will find suitable alternatives with a concealed blade in direct comparison.
SK-15 yellowconcealed bladeCutting depth 3.2 mmDisposable – no blade change2.00€ net
View H036
CB100concealed bladeCutting depth 7 mmBlade change possible8.99€ net
View HCB100
Secumax 145concealed bladeCutting depth 3.8 mmDisposable – no blade change2.25€ net
View UM145001
Kutter orangeconcealed bladeCutting depth 3.3 mmDisposable – no blade change1.96€ net
View H035OUsing the large eyelet, the Tortoris US53 can be secured with a lanyard so that it is always within reach in the warehouse. A collection box ensures safe disposal of dull disposable knives, a cutting ruler with a steel edge ensures exact cuts, and a robust belt pouch ensures quick access in daily use.
The most frequently asked questions about the Tortoris US53: from the disposable principle without blade change and the concave-ground premium blade from Solingen to the surprisingly strong carton performance and the differences from the OLFA SK-15. Answered concisely for purchasing and practice.
The Tortoris US53 is a disposable knife: the hook blade is firmly and securely built into the housing. Both edges can be used – when the first is dull, turn the knife over and continue cutting with the second edge. Only then is the entire knife replaced, with no exposed blade to handle at all.
The blade of the Tortoris US53 is a concave-ground hook blade made of high-quality carbon steel, manufactured in Solingen and Powered by Mozart. The curved grind practically draws the material into the cut – this produces exceptionally clean cuts and, in the BoxCutter test 2025, the best cut quality of all 19 knives.
Yes – and much better than most BoxCutters. While many level 3 safety knives only cut films and straps reliably, the Tortoris US53, thanks to its sharp hook blade, also cleanly opens single- to triple-wall corrugated board. The design is deliberately not intended for very thick or bulky materials.
The US53 is the right choice for stretch and shrink film, adhesive tape, PP and PET strapping, cords and corrugated cartons. Because of the 5.4 mm cutting channel, designed for safety, it is not intended for thick or bulky materials such as polystyrene, rubber or ropes.
Both are level 3 safety knives with a concealed blade. The Tortoris US53 is the overall test winner with the lowest cutting force (20 N) and the best cut quality – the first choice when maximum cutting performance counts. The OLFA SK-15 scores as the best-value winner with a stainless steel blade that is particularly suited to damp environments.
View all Tortoris products →This knife is a sharp working tool. Use only as intended. Keep out of the reach of children. Wear suitable protective gloves if necessary. Replace blades safely in accordance with the blade change instructions – do not make any improper modifications.
