How do I choose the right length for my application?

A general rule of thumb is to choose a screw length that is 2–3 times the thickness of the material being fastened. For example, if you are fastening a 5mm panel, a 10–15mm screw is typically appropriate. All lengths are listed in millimeters; to convert, divide by 25.4 to get inches (e.g., 25mm ≈ 1 inch, 50mm ≈ 2 inches).

What is the load-bearing or shear strength of these screws?

Shear and tensile strength vary by diameter and grade. Generally, 304 and 316 stainless steel machine screws offer good mechanical strength for light-to-medium duty applications. For critical structural loads, please consult an engineer or contact us to confirm specifications for your specific size.

Are these screws suitable for outdoor or marine use?

316 stainless steel offers the highest corrosion resistance and is generally recommended for marine, coastal, or highly humid environments due to its molybdenum content. 304 stainless steel is suitable for most outdoor applications with moderate exposure. 201 stainless steel is best for indoor or dry environments.

What thread standard do these screws use?

These screws use standard ISO metric coarse threads (M2, M2.5, M3, M4, M5, M6, M8), which are compatible with standard metric nuts, inserts, and tapped holes following ISO 68-1 specifications.

What screwdriver bit do I need for these screws?

These screws feature a Phillips (cross recessed) drive. Use a Phillips #0 or #1 bit for M2–M3 sizes, a Phillips #2 bit for M4–M6, and a Phillips #3 bit for M8. Using the correct bit size helps prevent cam-out and head damage.

What is a truss head and why would I choose it over a pan head?

A truss head has a wider, lower-profile dome compared to a pan head, distributing clamping force over a larger surface area. This makes it ideal for softer materials, thin panels, or applications where you want to minimize pull-through risk without using a washer.

M2–M8 Stainless Steel Phillips Truss Head Machine Screws | 201 / 304 / 316 - HomeDIYer

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M2–M8 Stainless Steel Phillips Truss Head Machine Screws | 201 / 304 / 316

HomeDIYer

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By HomeDIYer®

Size: M4 x 6mm

Materials: 201 stainless steel

Amount: 1 Pcs

Price:

$1.62 USD

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In stock (500 units), ready to be shipped

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M2–M8 Stainless Steel Phillips Truss Head Machine Screws — Reliable Fastening Across Every Project

Whether you're assembling electronics enclosures, securing sheet metal panels, or building out a DIY fixture, finding the right small-diameter machine screw in the correct material can be frustratingly time-consuming. These M2–M8 stainless steel Phillips truss head machine screws are stocked in a wide range of sizes and three stainless steel grades so you can get exactly what you need without ordering from multiple suppliers.

Each screw features a Phillips cross recessed truss head drive and is available in sizes from M2 through M8, with lengths ranging from 3mm (≈1/8") to 100mm (≈3-15/16"). Choose from 201 stainless steel for economical indoor use, 304 stainless steel for general-purpose corrosion resistance, or 316 stainless steel for marine and high-humidity environments. Screws are sold individually so you can order exactly the quantity you need.

Typical applications include electronics and PCB standoff assemblies, HVAC and ventilation panel fastening, light fixture and enclosure assembly, and general-purpose metric machine screw replacement. The wide, low-profile truss head distributes load effectively — a practical choice when fastening thin or soft materials where pull-through is a concern.

🔩 Compatibility: ISO metric coarse thread (M2–M8). Fits standard metric nuts, threaded inserts, and tapped holes per ISO 68-1. Use a Phillips #0–#1 bit for M2–M3, #2 for M4–M6, and #3 for M8.

✅ Key Features of These Stainless Steel Phillips Truss Head Machine Screws

🔩Wide Size Range — Available in M2, M2.5, M3, M4, M5, M6, and M8 diameters with lengths from 3mm (≈1/8") to 100mm (≈3-15/16"), covering the most common metric machine screw sizes in one listing.
🛡️Three Stainless Steel Grades — Choose 201 for cost-effective indoor use, 304 for general outdoor corrosion resistance, or 316 for marine-grade and chloride-resistant applications where long-term durability matters.
🔧Phillips Cross Recessed Drive — Compatible with standard Phillips #0–#3 screwdrivers and power bits; the cross recess provides positive engagement and reduces slippage during installation.
📐Low-Profile Truss Head Design — The wide, domed truss head distributes clamping load over a larger bearing surface, reducing pull-through risk in thin panels and soft substrates without requiring a separate washer.
⚙️ISO Metric Coarse Thread — Standard metric thread pitch ensures compatibility with off-the-shelf metric nuts, hex standoffs, threaded inserts, and pre-tapped holes across electronics, HVAC, and general fabrication applications.
📦Order by the Piece — Sold individually so you can match your exact quantity needs — ideal for repairs, prototyping, or topping off your hardware supply without buying a full box of a size you rarely use.

📐 Technical Specifications — Phillips Truss Head Machine Screws

Product Type	Phillips Cross Recessed Truss Head Machine Screw
Drive Type	Phillips (Cross Recessed)
Head Style	Truss Head (wide, low-profile dome)
Thread Standard	ISO Metric Coarse (M2, M2.5, M3, M4, M5, M6, M8)
Available Diameters	M2 · M2.5 · M3 · M4 · M5 · M6 · M8
Available Lengths	3mm (≈1/8") – 100mm (≈3-15/16"); see variant options for full list
Material Options	201 Stainless Steel · 304 Stainless Steel · 316 Stainless Steel
Surface Finish	Natural stainless (no additional coating)
Corrosion Resistance	201: Basic indoor use · 304: General outdoor · 316: Marine/high-chloride
Recommended Phillips Bit	#0–#1 for M2–M3 · #2 for M4–M6 · #3 for M8
Sold As	1 piece per order (select quantity at checkout)
Country of Origin	See variant options

⚠️ Note: Not all size and material combinations are available in every length. Please verify your selected variant is in stock before ordering. If you need a specific combination not shown, contact us to confirm availability.

❓ Frequently Asked Questions

How do I choose the right screw length for my application?

A general rule of thumb is to select a length that is 2–3 times the thickness of the material being fastened. For example, fastening a 5mm panel typically calls for a 10–15mm screw. All lengths are listed in millimeters; to convert to inches, divide by 25.4 (e.g., 25mm ≈ 1", 50mm ≈ 2", 100mm ≈ 3-15/16"). When threading into a tapped hole, the engaged thread length should generally be at least 1× the screw diameter for steel, and 1.5–2× for softer materials like aluminum or plastic.

What load or shear strength can these screws handle?

Shear and tensile strength vary by diameter, length, and grade. Generally, 304 and 316 stainless steel machine screws are well-suited for light-to-medium duty fastening in electronics, enclosures, and panel assemblies. For critical structural or high-load applications, we recommend consulting an engineer or contacting us to confirm specifications for your specific size and grade.

Can I use these screws outdoors or in a marine environment?

Yes, with the right grade selection. 316 stainless steel is generally the best choice for marine, coastal, or high-humidity environments due to its molybdenum content, which provides superior resistance to chloride-induced corrosion. 304 stainless steel is suitable for most outdoor applications with moderate weather exposure. 201 stainless steel is best reserved for dry, indoor use.

What thread standard do these screws follow — are they compatible with standard metric hardware?

These screws use ISO metric coarse threads, which are the most widely used metric thread standard. They are compatible with standard metric nuts, hex standoffs, threaded inserts, and pre-tapped holes following ISO 68-1 specifications. They are not compatible with UNC/UNF (inch) threaded hardware.

What is the difference between 201, 304, and 316 stainless steel — which should I choose?

201 stainless steel is a cost-effective grade with basic corrosion resistance, suitable for indoor or low-humidity environments. 304 is the most common grade, offering good corrosion resistance for general-purpose and outdoor use. 316 adds molybdenum, providing superior resistance to salt, chlorides, and harsh chemicals — making it the preferred choice for marine, food-processing, or chemical environments. When in doubt, 304 is a solid all-around choice; choose 316 if the application involves salt water or aggressive chemicals.

What screwdriver or bit size do I need for these Phillips truss head screws?

Use a Phillips #0 or #1 bit for M2 and M2.5–M3 sizes, a Phillips #2 bit for M4–M6, and a Phillips #3 bit for M8. Using the correctly sized bit is important — an undersized bit can cam out and damage the head, while an oversized bit may not seat properly. A bit with a magnetic tip is helpful for small M2–M3 screws.

Why choose a truss head over a pan head or flat head screw?

A truss head has a wider, lower-profile dome than a pan head, which distributes clamping force over a larger bearing surface. This makes it a practical choice when fastening thin sheet metal, plastic panels, or soft materials where pull-through is a concern — often eliminating the need for a separate washer. A flat (countersunk) head is used when a flush surface is required. Choose a truss head when you want a low-profile, wide-bearing fastener that sits above the surface.

🛒 Select your size, material, and quantity above, then add to cart — ships from our US warehouse.