4mm x 16mm screws are a versatile choice for light to medium fastenings in both wood and metal applications. This guide highlights five quality options that balance strength, corrosion resistance, and ease of use. Each product below is evaluated for material, head design, and suitability for indoor or outdoor projects, so you can pick the right fastener for your project’s needs.
Summary of chosen products
- uxcell 4mm x 16mm Phillips Pan Head Self-Tapping Screw, 100pcs — 304 Stainless Steel
- Fullerkreg 100 Pcs M4-0.70 x 16mm Button Head Socket Cap Bolts Screws
- Oneyijun 20 Pcs M4 x 16mm Self Tapping Wood Screws
- ZDingTech 50pcs Set Screws M4 x 16mm 304 Stainless Steel
- ZerDans M4 x 16mm Machine Screws, 30 PCS
uxcell 4mm x 16mm Phillips Pan Head Self-Tapping Screw
The uxcell screw is a 4mm diameter, 16mm length self-tapping option crafted in 304 stainless steel for rust resistance and durability in harsh environments. The pan head design allows a flush finish, improving surface smoothness and project aesthetics. Its broad head provides robust contact with material, helping to distribute load and reduce pull-out in wood or light metal applications.
Key points: 304 stainless steel for indoor/outdoor use, flush pan-head profile, self-tapping thread suited to wood and soft metals. Suitable for outdoor furniture, cabinetry, and light structural fixings where corrosion resistance is important. Pack size offers convenient stock for multiple projects.
Fullerkreg 100 Pcs M4-0.70 x 16mm Button Head Socket Cap Bolts
These M4 socket cap bolts use a button head with a hex drive for clean lines and a low profile. Made from 18-8 (304) stainless steel, they offer reliable corrosion resistance and long-term durability. The set includes a plastic case for organization, making it easy to select the right component during furniture assembly, cabinetry work, or DIY repairs where a recessed, smooth finish is desired.
Considerations: stainless steel provides corrosion resistance; the ISO 7380 standard ensures consistent head and thread dimensions. The button head is less obtrusive than larger pan heads, which can be preferable for concealed fastenings or modern furniture designs.
Oneyijun 20 Pcs M4 x 16mm Self Tapping Wood Screws
The Oneyijun offering features carbon steel construction with a mushroom round flange head, designed for drilling into wood. The 4mm thread diameter and 16mm length align with common wood joinery tasks and quick fixtures. The flanged head can help prevent pull-through and provide a neat surface finish when countersinking is not feasible.
Practical notes: suitable for fast wood-to-wood assemblies, cabinetry, or hobby projects. The coating and finish help resist corrosion in typical indoor environments; for outdoor use, consider weather protection or alternate stainless variants.
ZDingTech M4 x 16mm Set Screws 304 Stainless Steel
These M4 x 16mm set screws are intended to be flush with or below surfaces. Made from 304 stainless steel, they minimize protrusion while delivering reliable holding power in high-temperature and humid conditions. The set comes with 50 pieces and a hex wrench, providing a complete installation kit for fixtures requiring internal drive alignment without external heads.
Strengths: stainless steel resilience, flush seating capability, included Allen wrench for easy installation. Best suited for hardware connections, furniture hardware, or machinery assemblies that require a hidden or low-profile fastening approach.
ZerDans M4 x 16mm Machine Screws
ZerDans offers a 30-piece set of M4 x 16mm pan head machine screws crafted from 304 stainless steel. The pan head design provides a broader contact surface and is designed for stable engagement in furniture and equipment repairs. The included pack and corrosion resistance make these screws suitable for a range of indoor projects, with potential outdoor use given proper protection.
MroMax 10Pcs M4 x 16mm Truss Head Screws
These M4 x 16mm truss head screws combine a low-profile cross groove with a robust 304 stainless steel body. The truss head distributes load over a larger area, reducing surface wear and enabling a cleaner finish in cabinet hardware or electronics enclosures. The 2# Phillips drive is common and easy to service with standard bit sets.
MewuDecor M4-0.7 x 16mm Button Head Screws
The MewuDecor set uses alloy steel grade 10.9, offering a stronger tensile rating for demanding assemblies. The black oxide finish adds contrast and protection, while the button-head design supports clean, flush appearances. At 16mm length, these are suitable for medium-depth fastenings in metal or wood workpieces where a hidden or minimal-profile screw is preferred.
uxcell 20Pcs M4-0.7 x 16mm Flat Round Head Screws
This uxcell batch provides 20 flat round head machine screws with 4mm threads and a 16mm length. The 304 stainless steel with a black oxide finish offers corrosion resistance and a discrete profile for furniture assembly and decorative fixtures. The cross-groove drive aids alignment and centering, reducing the chance of cross-threading during installation.
Buying Guide: Key Purchase Considerations
- Material and corrosion resistance: Stainless steel (304/18-8) variants perform better outdoors and in high-humidity environments than carbon steel.
- Head type and finish: Pan heads offer flush surfaces and strong load distribution; button heads are low-profile; truss heads spread load for cabinetry and hardware applications.
- Thread compatibility: Ensure the metric M4 / 4mm thread matches your predrilled holes and nut compatibility; correct pitch (0.7mm) supports smooth engagement.
- Length and seating depth: 16mm is a common size for light to medium assemblies; confirm you have sufficient material thickness for seating without protrusion.
- Drive type: Phillips drive is common; hex socket set screws (Allen) require compatible tools and may suit recessed or secure fixtures better.
- Packaging and organization: Sets with cases or labeled storage help keep project inventories organized and reduce misplacement during work.
- Indoor vs outdoor use: For exterior applications, prioritize stainless steel or coated variants; consider protective finishes for extended exposure.
- Size compatibility: Verify the head diameter and neck clearance to avoid interference with nearby parts or openings in your assembly.
- Number of pieces: Choose a quantity that aligns with your project scale to minimize waste and ensure you have spares.