Efficient bending starts with reliable tooling. In sheet metal fabrication, the quality of the upper and lower press brake tools directly affects bending accuracy, surface finish, repeatability, and production stability.

As a global benchmark in press brake tooling, the WILA New Standard Premium series is widely used by sheet metal manufacturers for its deep hardening technology, precision-ground accuracy, and modular segmented design.

In this guide, we take a closer look at two highly versatile WILA tooling models: the BIU-021 upper tool and the OZU-352 lower die. Together, they form a dependable tooling combination for a wide range of general bending applications.

WILA BIU-021 Upper Tool: 28° Universal Punch for Common Bending Applications

The WILA BIU-021 is a classic upper tool from the New Standard Premium series. Designed for standard bending operations, it offers an excellent balance of precision, durability, and operator safety.

It is especially suitable for manufacturers who need a reliable general-purpose punch for daily sheet metal bending.

Key Specifications of WILA BIU-021

The BIU-021 is engineered for versatile bending requirements:

• Standard working height: H = 163 mm

• Tool angle: 28°

• Tip radius: R = 1 mm

• Material: CR-MO chrome-molybdenum alloy steel

• Maximum load capacity: 70 ton/m

With a 28° tool angle and 1 mm tip radius, the BIU-021 is suitable for most standard angle bending applications and small-to-medium radius forming tasks.

CNC-Deephardened® Technology for Longer Tool Life

One of the key advantages of WILA New Standard Premium tooling is its CNC-Deephardened® technology.

The BIU-021 features a hardened working surface with a depth of at least 4 mm and a hardness of 56-60 HRC. Combined with precision grinding, this gives the tool excellent wear resistance and stable geometry over long production runs.

For manufacturers working with repeated bending jobs, this means better bending consistency, reduced tool wear, and longer service life compared with standard hardened tooling.

Safety-Clicks® for Fast and Safe Tool Changes

The BIU-021 is equipped with WILA Safety-Clicks®, allowing vertical tool loading and unloading.

This design helps improve tool change efficiency while reducing the risk of accidental tool drop during setup. For busy fabrication workshops, safer and faster tooling changes can directly improve production flow and operator confidence.

Modular Segmented Design for Flexible Bending Lengths

The BIU-021 is available in multiple segmented lengths, including:

• 515 mm full section

• 550 mm segmented set

• 200 mm section

• 255 mm full section

• 20 mm and 25 mm fine adjustment segments

These segments can be combined in 5 mm increments to match different bending lengths. From short flange bending to long workpiece production, this modular design helps reduce the need for dedicated tooling and lowers inventory costs.

WILA OZU-352 Lower Die: A Stable 12 mm V Die for General Sheet Metal Bending

The WILA OZU-352 is a highly versatile lower die from the New Standard Premium series. It is often paired with the BIU-021 upper tool for standard sheet metal bending.

With its 12 mm V opening, the OZU-352 is well suited for many medium and thin sheet metal applications, making it a practical baseline die for fabrication workshops.

Key Specifications of WILA OZU-352

The OZU-352 lower die is designed for stable and accurate bending:

• Standard working height: 100 mm

• V opening: 12 mm

• Die angle: 30°

• Radius: R = 3 mm

• Maximum load capacity: 80 ton/m

The 12 mm V opening is commonly used for bending materials in the 1.0-2.0 mm thickness range, depending on the material type and bending requirements.

Typical applications include electrical cabinets, appliance panels, elevator decoration parts, enclosures, and general sheet metal components.

Deep Hardened Lower Die for Wear Resistance

Like the BIU-021 upper tool, the OZU-352 is made from CR-MO chrome-molybdenum steel and treated with CNC-Deephardened® technology.

Its working surface has a hardened layer of at least 4 mm, with hardness of 56-60 HRC. The precision-ground V groove ensures consistent angle accuracy, smooth radius transitions, and stable bending results.

This helps prevent common tooling issues such as edge collapse, uneven wear, and inconsistent bend angles during long-term use.

Multiple Versions for Different Production Needs

The OZU-352 series is available in different versions to meet specific production requirements:

• Standard version: suitable for most general bending applications

• ZN galvanized version: designed for applications involving galvanized sheet processing

The unified WILA interface allows flexible compatibility with existing New Standard tooling holders, making upgrades and replacements more convenient.

Segmented Lower Die for Flexible Production

The OZU-352 is also available in multiple segment sizes, including 515 mm, 550 mm segmented sets, 200 mm, and 255 mm sections.

These segments can be matched with the BIU-021 upper tool segments to accommodate different workpiece lengths. Individual segments can also be replaced when needed, helping reduce long-term maintenance costs.

Why Choose BIU-021 + OZU-352 as a Press Brake Tooling Combination?

The WILA BIU-021 upper tool and OZU-352 lower die form a practical and reliable combination for general sheet metal bending.

1. Excellent Versatility

The combination of a 28° upper punch and 12 mm V die covers a wide range of common sheet metal bending applications.

It can be used for materials such as cold-rolled steel, galvanized steel, and aluminum alloy sheets, making it a valuable standard tooling set for daily production.

2. Stable Bending Accuracy

Both tools are precision-ground and deep hardened, helping maintain consistent bending angles and good surface quality.

For batch production, this improves part consistency and reduces rework caused by tooling wear or angle deviation.

3. Lower Long-Term Operating Cost

Thanks to the modular segmented design, damaged or worn sections can be replaced individually. The deep-hardened working surfaces also extend service life, reducing tooling replacement frequency.

Combined with WILA’s standardized interface, this tooling set offers strong long-term value for professional sheet metal manufacturers.

Selection Tips for Sheet Metal Fabricators

The BIU-021 + OZU-352 combination is a strong choice if your production involves:

• General sheet metal fabrication

• Small and medium batch production

• Multi-variety bending jobs

• Common 1.0-2.0 mm sheet metal bending

• High-frequency production requiring durable tooling

• Applications requiring stable bending accuracy and repeatable results

For workshops looking for a reliable, universal, and cost-effective press brake tooling solution, the WILA BIU-021 upper tool and OZU-352 lower die are a proven combination worth considering.