M3 30mm Stainless Steel Screw - Bolt with Nut Combo (5+5)

The M3 30mm Stainless Steel Screw and Nut Combo is a standard metric fastening solution widely used in robotics frames, electronics enclosures, structural assemblies, and educational lab setups. With a 3 mm thread diameter and 30 mm length, this set is optimized for thicker or multi-layer mechanical constructions.

The pack includes:

• 5 x M3 30mm hex socket screws  

• 5 x M3 matching hex nuts  

Made from 304 stainless steel, the set provides corrosion resistance, strength, and consistent performance in repeated assembly applications.

Q: Is this combo suitable for robotics chassis assembly?  

Yes. The 30 mm length is ideal for multi-layer frames and structural brackets.

## Technical Architecture

The screw follows ISO metric M3 thread standards with right-hand threading. The included nut matches standard M3 pitch for smooth engagement and secure fastening.

The internal hex socket drive enables tightening using a 2 mm Allen key, making it suitable for compact mechanical assemblies where external spanners are not practical.

Problem-Solution:

Problem: Insufficient screw length for stacked assemblies  

Solution: 30 mm length supports thicker material combinations

## Why Choose This Combo?

• Matched screw and nut set  

• Corrosion-resistant stainless steel  

• Suitable length for structural builds  

• Reusable and durable  

• Ideal for institutional and lab kits  

Compared to shorter screws, this 30 mm version provides extended fastening depth for complex assemblies.

## Comparison with Related Variants

• M3 10mm – for thin panels and PCB mounting  

• M3 20mm – for medium assemblies  

• M3 40mm – for thicker multi-layer builds  

The 30 mm option provides balanced versatility for robotics and structural prototypes.

## Pin & Interface Overview

Not applicable. This is a mechanical fastening product.

## Power System Explanation

Not applicable. No electrical power or signal function.

## Common Issues & Troubleshooting

Issue: Nut difficult to tighten  

Cause: Misalignment  

Solution: Hand-thread before tightening

Issue: Hex socket wear  

Cause: Incorrect hex key  

Solution: Use 2 mm hex key only

Issue: Loosening under vibration  

Solution: Use washer or locking compound if required

## Who Should Buy This?

• School and college students  

• Robotics clubs  

• Engineering institutions  

• Mechanical lab technicians  

• Electronics kit assemblers  

## Practical Applications

• Robotics chassis construction  

• Structural bracket mounting  

• Enclosure stacking  

• Mechanical project frames  

• Educational lab hardware kits  

• Prototype structural support  

## Ecosystem Compatibility

Compatible with:

• M3 washers  

• M3 spacers  

• M3 threaded inserts  

• M3 standoffs  

Supports modular and scalable mechanical design systems.

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1️⃣1️⃣ KEY FEATURES

• M3 metric screw and nut combo  

• 30 mm length for structural assemblies  

• 304 stainless steel construction  

• Includes 5 screws and 5 nuts  

• Corrosion resistant  

• Hex socket drive for controlled tightening  

• Compatible with standard M3 hardware  

• Reusable for prototypes and lab use  

• Ideal for robotics and mechanical builds  

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1️⃣2️⃣ TECHNICAL SPECIFICATIONS

Material: 304 Stainless Steel  

Thread Size: M3 (3 mm)  

Screw Length: 30 mm  

Thread Type: Fully threaded  

Drive Type: Hex socket  

Hex Key Size: 2 mm  

Nut Type: Standard M3 Hex Nut  

Quantity: 5 Screws + 5 Nuts  

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1️⃣3️⃣ APPLICATIONS

• Robotics chassis assembly  

• Multi-layer structural frames  

• Electronics enclosure stacking  

• Academic lab projects  

• DIY mechanical builds  

• Prototype frameworks  

• Structural brackets  

• Student project hardware kits