Will My Samsung A51 Case Fit The A51 5g Or Do I Need A Different One

If you're upgrading from the Samsung Galaxy A51 to the A51 5G, or perhaps replacing a damaged phone with what seems like the same model, you might be wondering whether your current case will still work. At first glance, the two devices look nearly identical—same branding, similar design language, and close model numbers. But appearances can be deceiving. The reality is that even minor physical differences can make a case incompatible. Understanding these subtle yet critical distinctions helps avoid frustration, poor fit, or compromised protection.

This guide breaks down the physical and structural differences between the Samsung Galaxy A51 (2020) and the Galaxy A51 5G (also known as the A52 5G in some regions), so you can confidently decide whether to reuse your existing case or invest in a new one.

Physical Dimensions: A Closer Look at Size Differences

The most obvious factor in case compatibility is the phone’s physical size. Even a difference of half a millimeter can affect how snugly a case fits or whether ports and buttons align properly.

The original Samsung Galaxy A51 measures 158.5 x 73.6 x 8.9 mm and weighs approximately 172 grams. In contrast, the A51 5G comes in slightly larger at 159.6 x 74.7 x 8.4 mm and weighs about 176 grams. While this may seem negligible, the increased height and width mean the phone won’t sit flush inside a standard A51 case. The thinner profile of the 5G model might allow it to slide in, but the edges will likely protrude, leaving the screen or back vulnerable during drops.

More importantly, the slight increase in dimensions affects button placement, speaker cutouts, and charging port alignment. A case designed for the non-5G model may block access to the volume rocker or misalign the power button, making operation awkward or requiring excessive force.

Tip: Always check the exact model number on the back of your phone or in Settings > About Phone to confirm whether you have the 4G or 5G version.

Camera Module Design: A Critical Difference

One of the most significant reasons a case might not fit is the camera layout. Both phones feature quad-camera setups, but their configurations differ in shape and positioning.

The original A51 has a vertically aligned rectangular camera bump located in the top-left corner. It’s relatively compact and sits flush with the phone’s back panel. The A51 5G, however, features a more prominent, rounded square-shaped camera housing that extends further outward. This change isn't just aesthetic—it alters the space required for a proper case cutout.

A case made for the standard A51 will either partially cover the 5G model’s camera lenses or fail to provide adequate clearance, potentially causing lens smudging or obstructed shots. Some users report that thick cases cause vignetting in wide-angle photos due to interference with the ultrawide lens.

“Case compatibility isn’t just about overall size—it’s about precision around functional components like cameras and sensors.” — David Lin, Mobile Accessory Designer at TechFit Labs

Port and Button Layout Variations

Beyond size and camera design, internal component repositioning can affect external accessibility. While both models maintain the same general layout—power and volume buttons on the right, USB-C port at the bottom, headphone jack on top—small shifts in placement can disrupt usability when using an incompatible case.

For instance, the microphone and speaker cutouts are slightly adjusted on the A51 5G to accommodate updated audio hardware. Users have reported muffled sound quality when using a 4G case because the speaker hole doesn’t fully align. Similarly, the SIM tray location remains consistent, but its depth and angle may vary enough to make insertion difficult with a tight-fitting older case.

Additionally, the A51 5G includes an improved haptic motor, which requires different internal spacing. Though not visible externally, this contributes to the altered thickness distribution across the chassis, especially near the center and lower back.

Material and Build Compatibility

Samsung uses polycarbonate plastic for both models, but the A51 5G incorporates a more rigid internal frame to support its enhanced 5G antenna system. This results in a stiffer backplate, which affects how flexible cases snap into place.

Many third-party silicone or TPU cases rely on a snug friction fit. When placed on a slightly larger device, they may stretch beyond their elastic limit, leading to warping or cracking over time. Hard plastic cases, especially those with rigid side walls, often won’t close properly or may require damaging force to install.

Folios and wallet-style cases tend to be more forgiving due to their looser interior pockets, but even these can suffer from misaligned magnet placements or improper closure mechanisms when used with the wrong model.

Comparison Table: Key Differences Between A51 and A51 5G

Feature	Samsung Galaxy A51 (4G)	Samsung Galaxy A51 5G
Dimensions	158.5 x 73.6 x 8.9 mm	159.6 x 74.7 x 8.4 mm
Weight	172 g	176 g
Camera Housing	Vertical rectangle, low profile	Rounded square, raised module
Button Alignment	Standard placement	Slightly shifted right-side controls
Speaker Cutout	Narrower opening	Extended bottom-firing grill
Case Compatibility	Fits A51-specific cases only	Requires 5G-specific design

Real-World Example: Maria’s Case Dilemma

Maria upgraded her aging Galaxy A51 to the newer A51 5G, excited about faster connectivity and better performance. She assumed the phones were interchangeable and reused her favorite clear shock-absorbing case. Within days, she noticed issues: the camera couldn’t focus properly in low light, and photos taken with the ultrawide lens had dark corners. Upon inspection, she realized the case was pressing against the lens edges.

Worse, the power button felt stiff and unresponsive. After removing the case, she discovered the plastic had warped slightly, no longer snapping securely. She eventually purchased a dedicated A51 5G case, which resolved all problems. Her experience highlights how seemingly minor design changes can significantly impact functionality when ignored.

Step-by-Step Guide: How to Verify Case Compatibility

1. Check your phone’s model number: Go to Settings > About Phone > Model Number. The A51 5G typically shows “SM-A516U” (or similar variant), while the 4G model is “SM-A515F”.
2. Compare dimensions: Measure your phone or refer to official specs online. Even a 1mm difference in length or width suggests incompatibility.
3. Test camera clearance: Place the phone in the case and inspect whether all four lenses are fully exposed without contact.
4. Verify button function: Press volume and power buttons. They should move smoothly without obstruction.
5. Assess overall fit: The case should click into place without excessive force and remain secure during normal handling.

Tip: If buying online, search specifically for “Samsung Galaxy A51 5G case” – avoid generic listings labeled simply “A51.”

Frequently Asked Questions

Can I modify an A51 case to fit the A51 5G?

While some users attempt to sand or trim stubborn areas, this risks damaging the case’s integrity and voids any warranty. It also compromises protection. Modifying plastic near camera cutouts can create sharp edges that scratch the lens. It’s safer and more cost-effective to purchase the correct case.

Are there any cases that fit both models?

A very small number of universal or adjustable cases claim compatibility with multiple A-series phones. However, these often sacrifice precise fit for flexibility, leading to looseness or poor drop protection. For optimal safety and aesthetics, choose a model-specific case.

Why does Samsung release so many similar models?

Samsung segments its lineup to target different markets and price points. The A51 5G includes upgraded internals like the Exynos 980 chip and 5G support, necessitating internal redesigns that affect external dimensions. This strategy allows them to offer incremental improvements without full rebranding.

Final Recommendation: Invest in the Right Case

Despite their visual similarities, the Samsung Galaxy A51 and A51 5G are distinct devices requiring separate accessories. Using a case designed for the 4G model risks poor protection, impaired functionality, and long-term wear on both phone and case. Given that high-quality cases are affordably priced—often under $15—it’s a small investment for peace of mind.

Look for reputable brands like Spigen, OtterBox, or ESR that clearly label compatibility. Read customer reviews focusing on fit and camera clearance. Your phone deserves protection tailored to its exact form, not a compromise based on assumptions.

💬 Have you tried using an A51 case on the A51 5G? Share your experience in the comments to help others make informed decisions!