M3 Brass Insert Nuts - 120pcs M3x5x4mm Heat Set Insert Nuts

Multiple specifications available
► MICRO & STANDARD (120pcs)
M1.4×2.5×2.3 | M1.4×4×2.3
M2×2×3.2 | M2×3×3 | M2×4×3.2 | M2×6×3
M2.5×3×3.5 | M2.5×4×3.5
M3×3×4.2 | M3×4×4 | M3×4×5 | M3×5×4 | M3×5×4.6 | M3×5.7×4.6 | M3×6×5 | M3×7×4 | M3×8×5 | M3×9×4.5

► HEAVY DUTY (60pcs)
M4×3×5 | M4×4×6 | M4×5×5.5 | M4×6×6 | M4×8×6
M5×6×7 | M5×7×7 | M5×8×7 | M5×10×7
M6×8×8 | M6×10×8
M8×12×10

These Metric Brass Knurled Nuts create permanent, vibration-proof threads in plastics, wood, and composites – solving weak joints in 3D prints, drone frames, and CNC assemblies.

Micro Size (M1.4, M2, M2.5)
M1.4×2.5×2.3 / M1.4×4×2.3: Precision 3D printing (micro models, wearables), Miniature electronics (sensors, micro-devices), Low-load plastic joints (e.g., eyewear hinges)
M2×2×3.2 / M2×3×3 / M2×4×3.2 / M2×6×3: Small 3D prints (drones, robotics joints), Electronics enclosures (routers, remotes), Hobbyist models & lightweight toys
M2×6×3: Thicker plastic walls or deeper embedding

Standard Size (M3 - Most Versatile)
Short (3-5mm): Thin-walled 3D prints (enclosures, panels)，Light-duty connections (cosplay props, handles)
*M3×4×5/M3×5×4.6*: Enhanced grip for soft plastics
Medium (5-6mm):General-purpose 3D printing (drones, tools, prototypes)，Optimal pull-out resistance for 3-5mm walls
Long (7-9mm):High-stress joints (motor mounts, load-bearing parts)，Thick materials (≥5mm) or multi-layer assembly
M3×9×4.5: Deep cavities/specialized structures

Medium Duty (M4)
M4×3×5 / M4×4×6 / M4×5×5.5 / M4×6×6 / M4×8×6:Larger 3D prints (printer frames, tool housings), Furniture connectors (chair arms, storage bins)
Industrial plastic housings, *6-8mm lengths*: Critical load points; 6mm OD boosts torque resistance

Heavy Duty (M5, M6, M8)
M5×6×7 /M5×7×7 / M5×8×7 / M5×10×7:Structural 3D prints (furniture, workbenches),Thick engineering plastics & industrial guards,M5×10×7: Extreme pull-out resistance (≥8mm walls)
M6×8×8 / M6×10×8:Heavy machinery plastics & agricultural equipment

High-load structural joints
M6×10×8: Superior holding power for thick walls
M8×12×10:Industrial-grade plastic structures & prototypes, Heavy carts, large-scale installations, Requires very thick walls (≥10mm)

3-SECOND HEAT-SET INSTALLATION
Melt into PLA/PETG/ABS/Nylon with any soldering iron (150-200°C/300-400°F).
Brass alloy conducts heat 2X faster than steel – prevents bubbling/warping in thin-walled prints.

360° ANTI-SPIN LOCK
Spiral knurl + serrated flange bites into material for high-torque applications:
Motor mounts, gear assemblies, and dynamic joints.
No glue needed – withstands 200+ insertion/removal cycles.

CORROSION-RESISTANT & EMI-SAFE
Ideal for marine drones, automotive electronics, and outdoor gear.
Non-magnetic properties protect sensitive instrumentation.