The best M3.5 flat head screw depends on the required length, drive type, and material. For short Phillips screws, choose the DTGN 6mm stainless steel set; for black carbon-steel screws, compare METALLIXITY’s 8mm and 16mm options. The KEMIFON kit includes M3.5 Torx screws in several lengths, while the 900-piece assortment is not an exact M3.5 match. Check thread pitch and the material being fastened before ordering.
| Product | Best For | Key Detail |
|---|---|---|
| METALLIXITY M3.5 x 8mm | Short black Phillips screws | 50 pieces; 7.2mm head |
| DTGN M3.5 x 6mm | Short stainless screws | 304 stainless steel; 0.6mm pitch |
| METALLIXITY M3.5 x 16mm | Longer black Phillips screws | 50 pieces; 7.2mm head |
| KEMIFON Torx kit | Multiple M3.5 lengths | Torx drive; 6–14mm lengths |
| 900-piece assortment | Smaller metric screw sizes | Includes M2, M2.5, and M3—not M3.5 |
METALLIXITY M3.5 x 8mm Phillips Screws
These black carbon-steel machine screws have an M3.5 diameter and an 8mm length. The listed head diameter is 7.2mm, and the package contains 50 Phillips flat head screws. The seller describes them for metal, plastic, sheet products, electronics, furniture, and general repair applications.
Best for: Buyers who need a short black screw and a Phillips cross drive for a small assembly or repair. It is a useful middle-length choice compared with the 6mm and 16mm options in this guide.
Limitation: The provided details do not state a corrosion-resistant material or finish beyond the black color. Consider the application environment before choosing carbon steel.
DTGN M3.5 x 6mm Stainless Screws
This 50-piece set specifies an M3.5 thread diameter, 0.6mm thread pitch, and 6mm length. Its 304 stainless-steel construction is described as corrosion- and rust-resistant. The Phillips countersunk heads are intended to sit flush with a suitable surface, and the listing highlights clearly formed cross grooves and accurate threads.
Best for: Buyers who need a short M3.5 screw, want the listed pitch clearly specified, or prefer 304 stainless steel for an application where corrosion resistance matters.
Limitation: At 6mm long, it may not provide enough engagement for thicker parts. Verify the required length and mating thread before purchase.
METALLIXITY M3.5 x 16mm Phillips Screws
This set contains 50 black carbon-steel machine screws, each with an M3.5 diameter and 16mm length. The listing gives a 7.2mm head diameter and describes a Phillips cross slot. Suggested applications include metal, plastic, sheet products, furniture, electronics, and machinery.
Best for: Buyers whose assembly needs more screw length than the 6mm or 8mm choices provide. Choose this option when the part thickness and available thread depth call for a longer screw.
Limitation: A 16mm screw can protrude or bottom out in a shallow hole. Measure the material stack and hole depth rather than selecting by diameter alone.
KEMIFON M3.5 Torx Flat Head Kit
This mixed kit includes M3.5 screws along with M3, M4, and several inch-based sizes. The listed lengths are 6mm, 8mm, 10mm, 12mm, and 14mm, with four screws of each length for each type. The screws are described as 12.9-grade carbon steel with a black oxide finish, and a T10 Torx wrench is included.
Best for: Buyers who want several M3.5 lengths and a Torx drive rather than a Phillips drive. It offers more length choices than the single-size packs.
Limitation: This is a mixed-size kit, not a large quantity of one M3.5 length. Confirm the package count for the exact size you need.
900-Piece M2–M3 Hex Socket Assortment
This assortment contains M2, M2.5, and M3 screws, plus matching nuts and washers, according to the product details. It is described as Grade 10.9 alloy steel with a black oxide coating and a hex socket drive.
Best for: Buyers assembling a supply of smaller metric fasteners who may need M2, M2.5, or M3 sizes alongside nuts and washers.
Limitation: The listed sizes do not include M3.5. Do not choose this kit when an M3.5 screw is required; its high-strength material description does not make it a size substitute.
Buying Guide: How to Choose M3.5 Flat Head Screws
What length should you buy?
Measure the combined thickness of the pieces being fastened and check how much threaded engagement the assembly requires. The products here range from 6mm to 16mm, with the KEMIFON kit covering several intermediate lengths. Avoid choosing a longer screw without checking for interference or a shallow hole.
Does thread pitch matter?
Yes. Diameter alone does not establish that a screw will fit a threaded hole. The DTGN listing specifies an M3.5 diameter and 0.6mm pitch. For other products, confirm pitch against the part’s existing screw or technical requirements before ordering.
Which drive and material fit the job?
Phillips screws suit buyers who have the corresponding driver, while the KEMIFON option uses a T10 Torx drive. The DTGN screws are listed as 304 stainless steel; the METALLIXITY screws are carbon steel. Compare the stated material with moisture exposure and the application. Do not assume that black color alone indicates corrosion protection.
Will a flat head sit flush?
A flat or countersunk head is designed for a matching countersink so its top can sit flush with the surface. Check that the workpiece has a compatible seat and enough material. The listed head diameter is 7.2mm for both METALLIXITY sets; the other listings do not provide that measurement.
Frequently Asked Questions
What does M3.5 mean on a screw?
M3.5 identifies a metric screw with a nominal thread diameter of 3.5mm. Check the pitch and length separately, since those dimensions determine whether it fits a particular assembly.
Are M3.5 x 6mm and M3.5 x 8mm screws interchangeable?
They share the stated diameter, but their lengths differ. Use the length specified for the assembly; a shorter screw may not engage enough thread, while a longer one may protrude or bottom out.
Are all the products in this list Phillips drive?
No. The METALLIXITY and DTGN options are Phillips drive. KEMIFON is a Torx kit, and the 900-piece assortment uses a hex socket drive.
Does the 900-piece kit include M3.5 screws?
No. Its listed sizes are M2, M2.5, and M3. Choose a product that explicitly lists M3.5 when that diameter is required.
Which option is listed as stainless steel?
The DTGN M3.5 x 6mm screws are listed as 304 stainless steel. The METALLIXITY options are listed as carbon steel, and KEMIFON describes its kit as carbon steel with a black oxide finish.