51×21mm Aluminum Barcode Scanner and POS Terminal Housing

The Boyuan 51×21mm aluminum enclosure is an ultra-thin electronic device housing manufactured with an aluminum alloy extrusion structure, with an external cross-section size of 51mm (width) × 21mm (height), and the length can be customized arbitrarily according to actual equipment requirements.

The product is formed by aluminum profile extrusion, with a fixed main body cross-section size. It can be cut according to the actual length of the equipment, and final assembly is completed through end plates, CNC machining, and other supporting processes.

The aluminum extrusion electronic enclosure can be designed with corresponding mounting slots or support structures according to the internal structure, for installing PCBs and other electronic components. The interior of the housing is designed with standard circuit board card slots, and the PCB can be directly inserted and fixed without additional screws, greatly improving assembly efficiency.

Compared with plastic boxes, aluminum alloy enclosures have better structural strength and a metal texture, and can achieve custom structures such as interfaces, mounting holes, threaded holes, and slots through CNC machining.

Boyuan Hardware has focused on aluminum enclosure and aluminum chassis manufacturing for over 20 years, with approximately 10,000 square meters of production factory space, and can provide custom aluminum enclosure machining according to customer drawings, samples, or size requirements.

Product Advantages

01 | 51×21mm Ultra-Wide and Ultra-Thin Design

The 51mm wide × 21mm high cross-section size provides an ideal ultra-thin packaging solution for handheld and smart terminal devices.

The 51mm width can accommodate wider PCB layouts and side-by-side design of multiple interfaces, suitable for devices integrating multiple function modules such as screens, buttons, card slots, and fingerprint recognition; the 21mm ultra-thin height keeps the device slim, improving handheld grip comfort and product quality perception.

02 | Aluminum Extrusion Structure

The 51×21mm Aluminum Barcode Scanner and POS Terminal Housing body is formed by aluminum alloy profile extrusion. The cross-section size of the aluminum extrusion enclosure is fixed, while the length can be cut according to actual product requirements. Therefore, the same specification enclosure can adapt to PCBs and electronic modules of different lengths.

03 | Suitable for PCB Mounting

The aluminum extrusion electronic enclosure can be designed with corresponding mounting slots or support structures according to the internal structure, for installing PCBs and other electronic components. The interior is standard-equipped with circuit board card slots, and the PCB can be directly inserted and fixed without additional screws.

04 | CNC Custom Machining Support

The standard profile is only the starting point. Boyuan Hardware can perform CNC machining on the 51×21mm aluminum enclosure according to customer drawings, including:

• Interface openings (USB, Type-C, RJ45, power interfaces, etc.)
• Screw holes and positioning holes
• Threaded holes and counterbore holes
• Screen window openings
• Card swiping slots
• Fingerprint recognition module openings
• Button holes
• Grooves and steps
• Chamfering
• Other custom structures

05 | Length Customizable to Product

51×21mm is the cross-section specification of the enclosure, and the product length can be cut according to the actual equipment dimensions. The specific machinable length is confirmed according to material, surface treatment, and product requirements.

06 | Metal Enclosure Combines Structure and Appearance

Aluminum alloy is lightweight and has good structural performance, while retaining a natural metal texture. Through surface treatments such as brushing, sandblasting, and anodizing, different appearance effects can be obtained, giving handheld devices a more professional product texture.

51×21mm Aluminum Enclosure Technical Specifications

Note: Specific material grades, wall thickness, length ranges, dimensional tolerances, and surface treatment colors shall be subject to actual product drawings and order requirements.

What Products Is the 51×21mm Aluminum Enclosure Suitable For?

51×21mm Aluminum Barcode Scanner and POS Terminal Housing belongs to the ultra-wide and ultra-thin aluminum enclosure category — the 51mm width can accommodate side-by-side layout of multiple function modules, and the 21mm height keeps the device ultra-thin. The 21mm ultra-thin height is the core feature of this specification, making it especially suitable for handheld and ultra-thin smart terminal devices.

1. Barcode Scanners

• Handheld barcode scanners
• QR code scanners
• Industrial scanning guns
• Supermarket/retail scanning equipment
• Logistics and express scanning terminals
• Warehouse management scanners

Why is 51×21mm suitable for barcode scanners? Barcode scanners are usually designed as handheld devices and need an ergonomic grip. The 51mm width can accommodate multiple functional components such as the scanning head, decoding board, buttons, indicator lights, and USB/Bluetooth modules. The 21mm ultra-thin height makes the device slim and lightweight, comfortable to hold, and suitable for long-term handheld operation.

2. POS Machines and Payment Terminals

• Mobile POS machines
• Smart cashier terminals
• Payment card swiping devices
• Scan-to-pay terminals

Why is 51×21mm suitable for POS machines? POS machines need to integrate multiple functional modules such as card slots, password keyboards, NFC card readers, displays, and printers. The 51mm width provides ample layout space, and the 21mm thickness maintains the portability of the device. The aluminum alloy enclosure enhances the product's sense of security and quality, while also providing dustproof and anti-static properties.

3. Smart Access Card Readers

• Access control card reader enclosures
• Building intercom modules
• Attendance terminals
• Visitor management equipment

Why is 51×21mm suitable for access card readers? Access card readers need a relatively wide body to accommodate induction coils, card reading circuit boards, indicator lights, and buttons. The 51mm width exactly matches the standard 86-box installation size, and the 21mm ultra-thin design makes the device slim when wall-mounted, aesthetically pleasing and unobtrusive.

4. Handheld Terminals and Data Collectors

• Industrial handheld terminals
• Data collectors
• Inspection terminals
• Warehouse management handheld devices
• Mobile law enforcement terminals

5. Fingerprint Recognition and Biometric Modules

• Fingerprint attendance machines
• Access control fingerprint modules
• Biometric recognition terminals
• Identity verification devices

6. LED Display Control Cards

• LED control card enclosures
• Display sending cards
• Asynchronous control cards
• Video processor modules

Why is 51×21mm suitable for LED control cards? LED control cards are usually standard wide PCBs (approximately 45-50mm wide), and the 51mm width fits perfectly; the 21mm ultra-thin height is suitable for installation in LED display cabinets or narrow spaces.

7. Ultra-Thin Sensor Modules

• Ultra-thin photoelectric sensors
• Ultrasonic distance measurement modules
• Infrared sensors
• Laser distance measurement modules

8. Ultra-Thin Power Supplies and Adapters

• Ultra-thin power adapters
• LED driver power supplies
• Fast charging module enclosures

9. Consumer Electronics and Smart Hardware

• Smart remote controls
• Wireless microphone receivers
• Bluetooth audio receivers
• Smart home control panels
• Portable translators

What Can Be Customized for the 51×21mm Aluminum Enclosure?

Surface Treatment

Anodizing

Anodizing is one of the commonly used surface treatment methods for aluminum enclosures. It can change the appearance and surface properties of the aluminum surface and achieve different color effects.

Sandblasting

Sandblasting can form a uniform matte texture on the aluminum surface, suitable for industrial handheld devices and instrument enclosures.

Brushing

Brushing can form regular metal textures, allowing the product to maintain an obvious aluminum alloy metal texture.

Laser Engraving

The following can be machined on the surface of the 51×21mm aluminum enclosure:

• Logo
• Product model
• Interface identification
• Product number
• Text and patterns

Silkscreen Printing

Suitable for machining multi-color logos, text, and function identification.

Professional Aluminum Enclosure Custom Machining

We not only produce standard aluminum enclosures, but can also customize according to customer product structures.

Customers only need to provide:

2D drawings / 3D models / physical samples / product dimensions

We can then perform machining evaluation according to actual product requirements.

CNC Machining Meets Non-Standard Requirements

For products that cannot be directly satisfied by the 51×21mm standard profile, customization can be achieved through subsequent CNC machining.

For example:

Interface openings + screen windows + card swiping slots + button holes + fingerprint module openings + mounting holes + logo

All can be machined according to customer drawings.

Product Selection Guide

If Your PCB Width Is Close to 51mm

51×21mm is an ideal choice — the 51mm width provides ample PCB routing space and side-by-side layout of function modules, and the 21mm ultra-thin height keeps the device slim and portable.

If You Are Designing a Handheld Device

The 21mm ultra-thin height is the core advantage of 51×21mm, suitable for devices that need to be held by hand — barcode scanners, POS machines, handheld terminals, etc. — providing a comfortable and lightweight grip.

If You Need to Integrate Multiple Function Modules

The 51mm width can accommodate side-by-side layout of multiple function modules such as screens, card slots, fingerprint recognition, buttons, and indicator lights, suitable for smart terminals with integrated functions.

If You Need to Install in a Narrow Space

The 21mm ultra-thin height is suitable for installation in LED display cabinets, inside equipment, or wall-mounted installation scenarios with strict thickness requirements.

If PCB Lengths Differ

The profile can be cut according to product length, and the same cross-section specification can adapt to products of different lengths.

Workshop Show

FAQ

1. What products is the 51×21mm aluminum enclosure suitable for?

51×21mm belongs to the ultra-wide and ultra-thin aluminum enclosure category. Core applications include barcode scanners, POS machines, smart access card readers, handheld terminals, fingerprint recognition modules, LED display control cards, ultra-thin sensors, etc. The 51mm width supports multi-module layout, and the 21mm ultra-thin height keeps the device slim and portable.

2. Is 51×21mm the length of the enclosure?

No. 51×21mm Aluminum Barcode Scanner and POS Terminal Housing refers to the cross-section size of the enclosure (width × height). The product length can be cut according to actual equipment and PCB length.

3. Can the length of the 51×21mm aluminum enclosure be customized?

Yes. The length of the aluminum extrusion enclosure can be cut according to product requirements. The specific length needs to be confirmed in combination with material, surface treatment, and product structure.

4. Can a screen window be made on the aluminum enclosure?

Yes. Boyuan Hardware can CNC machine screen display windows, indicator light holes, and other structures on the aluminum enclosure according to customer drawings.

5. Can a card swiping slot be machined?

Yes. For products requiring card swiping functions such as POS machines and access card readers, magnetic card/IC card swiping slots can be machined on the aluminum enclosure according to customer drawings.

6. Can a fingerprint recognition module opening be machined?

Yes. Precise mounting openings can be machined on the aluminum enclosure according to the fingerprint module dimensions provided by the customer.