M4×8mm Stainless Steel Phillips Pan Head Machine Screw A2 50-Pack

M4×8mm Stainless Steel Phillips Pan Head Machine Screw — A2, 50-Pack

The M4×8mm A2 stainless steel Phillips pan head machine screw is the standard M4 length for aluminium extrusion assembly, electronics enclosure panel mounting, and structural robotics builds. M4 provides greater clamping force than M3 for heavier components, and the 8mm length is optimal for standard M4 T-slot nuts, hex nuts, and tapped aluminium brackets.

Key Specifications

Parameter	Value
Thread Size	M4
Length	8mm
Material	A2 Stainless Steel
Drive	Phillips (cross head)
Head Style	Pan head
Thread Type	Machine thread (metric coarse, 0.7mm pitch)
Quantity	50pcs per pack
Standard	ISO 7045 / DIN 7985

Why Choose This Screw?

• M4 higher clamping force — M4 provides approximately 2× the clamping force of M3; preferred for heavier components, structural brackets, and load-bearing assemblies
• 8mm standard length — optimal thread engagement in standard M4 T-slot nuts, hex nuts, and tapped aluminium brackets (3–4mm thick)
• A2 stainless steel — corrosion-resistant for electronics, outdoor, and industrial environments
• Phillips drive — compatible with all standard Phillips #2 screwdrivers and magnetic bit drivers
• 50-pack quantity — practical workshop stock for prototyping and production

Typical Applications

• Aluminium extrusion 3030 and 4040 T-slot assembly (M4 standard for 3030 profile)
• Electronics enclosure panel mounting (M4 for heavier panels and components)
• NEMA 23 stepper motor mounting (M4 or M5 mounting holes)
• Robotics chassis and structural bracket assembly (M4 for load-bearing joints)
• CNC machine axis and gantry structural assembly
• Industrial equipment panel and bracket mounting

Compatible With

• M4 T-slot nuts for 3030 and 4040 aluminium extrusion
• M4 hex nuts (DIN934), nyloc nuts, and flange lock nuts (DIN6923)
• M4 flat washers and split lock washers
• M4 brass standoffs and hex standoffs
• Phillips #2 screwdriver; magnetic tip recommended
• NEMA 23 stepper motors (M4 or M5 mounting holes — check motor datasheet)

Package Contents

• 50× M4×8mm A2 stainless steel Phillips pan head machine screws

Frequently Asked Questions

Q: When should I use M4 instead of M3 screws?

A: Use M4 when: (1) the component specifies M4 mounting holes (NEMA 23 motors, larger aluminium extrusion profiles), (2) higher clamping force is required for structural joints, (3) the panel or bracket is too thick for M3 to provide adequate thread engagement, or (4) the application involves vibration or dynamic loads where M3 may be insufficient.

Q: What aluminium extrusion profile uses M4 screws?

A: 3030 extrusion typically uses M4 or M6 T-slot nuts. 4040 extrusion uses M5 or M8. 2020 extrusion uses M3 or M4. Check your specific extrusion profile’s T-slot channel width to determine the correct nut and screw size.

Q: What Phillips screwdriver size do I need for M4 screws?

A: M4 pan head screws use a Phillips #2 (PH2) screwdriver. Using a #1 will cause cam-out and strip the head. A magnetic tip screwdriver is recommended for accurate placement.

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