M3×12mm Stainless Steel Phillips Pan Head Machine Screw A2 50-Pack

M3×12mm Stainless Steel Phillips Pan Head Machine Screw — A2, 50-Pack

The M3×12mm A2 stainless steel Phillips pan head machine screw is specified for thick motor mounts, deep tapped hole assemblies, and structural 3D printer builds where maximum thread engagement is required. The 12mm length passes through thick aluminium brackets, motor mounts, and stacked panels while providing full thread engagement in deep M3 tapped holes.

Key Specifications

Parameter	Value
Thread Size	M3
Length	12mm
Material	A2 Stainless Steel
Drive	Phillips (cross head)
Head Style	Pan head
Thread Type	Machine thread (metric coarse, 0.5mm pitch)
Quantity	50pcs per pack
Standard	ISO 7045 / DIN 7985

Why Choose This Screw?

• 12mm for maximum engagement — passes through thick brackets (5–6mm) and provides full thread engagement in deep M3 tapped holes; the longest standard M3 length for most electronics applications
• Thick motor mount applications — ideal for NEMA 17 mounting through thick aluminium motor mounts (5–6mm) where M3×10mm is too short
• A2 stainless steel — corrosion-resistant for electronics, outdoor, and humid environments
• Phillips drive — compatible with all standard Phillips #1 screwdrivers
• 50-pack quantity — practical workshop stock for prototyping and production

Typical Applications

• NEMA 17 stepper motor mounting through thick aluminium motor mounts (5–6mm)
• 3D printer Z-axis motor and leadscrew coupling assembly
• CNC machine axis motor mount and drive component assembly
• Thick aluminium bracket and structural frame assembly
• Electronics enclosure thick wall assembly (5–6mm wall thickness)
• Robotics actuator and heavy-duty bracket mounting

Compatible With

• NEMA 17 stepper motors (M3 tapped holes, 4.5mm deep)
• Thick aluminium motor mounts (5–6mm thickness)
• M3 hex nuts, nyloc nuts, and flange lock nuts
• M3 flat washers and split lock washers
• Phillips #1 screwdriver; magnetic tip recommended
• 3D printer platforms: Voron 2.4, RatRig V-Core 3, Annex Engineering builds

Package Contents

• 50× M3×12mm A2 stainless steel Phillips pan head machine screws

Frequently Asked Questions

Q: When should I use M3×12mm instead of M3×10mm?

A: Use M3×12mm when mounting through panels or brackets thicker than 4mm, or when the tapped hole depth allows for longer engagement. For NEMA 17 motors mounted through a 5–6mm aluminium plate, M3×12mm provides better thread engagement than M3×10mm.

Q: Will M3×12mm bottom out in a NEMA 17 motor?

A: NEMA 17 motors have M3 tapped holes approximately 4.5mm deep. With a 5mm motor mount bracket, M3×12mm leaves approximately 2.5mm of thread engagement in the motor — which is at the minimum recommended. For thicker mounts (6mm+), M3×12mm is the correct choice. Always verify your specific motor mount thickness before selecting screw length.

Q: Can I use M3×12mm for aluminium extrusion T-slot assembly?

A: Yes, for thick bracket assembly. Ensure the T-slot nut thread depth is sufficient for 12mm engagement. Standard M3 T-slot nuts have approximately 6–8mm of thread depth, so M3×12mm is suitable for brackets up to 4–5mm thick.

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