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Finding the right UNC stainless steel machine screw shouldn't require sourcing from multiple suppliers. Whether you're assembling electronics enclosures, securing PCB standoffs, building mechanical fixtures, or maintaining industrial equipment, having the right thread size and length in a corrosion-resistant material is critical — and hard to find in one place.
These Phillips pan head machine screws are precision-formed from A2 stainless steel (304 SS equivalent), offering excellent corrosion resistance, oxidation resistance, and reliable mechanical strength. Available in four standard UNC thread sizes — #2-56, #4-40, #6-32, and #8-32 — with lengths from 3/16" to 1-1/2" depending on the diameter. Pack quantities of 50 or 100 pieces let you stock exactly what your project demands.
Ideal for electronics enclosures, PCB assemblies, computer hardware, HVAC equipment, automotive trim, laboratory instruments, and general mechanical assemblies requiring UNC-threaded stainless fasteners.
| Material | A2 Stainless Steel (304 SS equivalent) |
|---|---|
| Type | Pan Head Machine Screw — Phillips drive |
| Thread Standard | UNC (Unified National Coarse) — American standard |
| Available Thread Sizes | #2-56 · #4-40 · #6-32 · #8-32 |
| Available Lengths | #2-56: 3/16–5/8" · #4-40: 3/16–1" · #6-32: 3/16–1-1/2" · #8-32: 1/4–1-1/2" |
| Drive Style | Phillips (cross) — #1 for #2/#4, #2 for #6/#8 |
| Head Style | Pan Head (low profile, rounded top) |
| Surface Treatment | Natural stainless finish (untreated) |
| System of Measurement | Inch (Imperial) |
| Pack Quantities | 50 pcs / 100 pcs |
| Typical Applications | Electronics enclosures, PCB assemblies, computer hardware, HVAC, automotive trim, laboratory instruments, general mechanical assemblies |
These screws are made from A2 stainless steel (equivalent to 304 SS), which provides excellent corrosion resistance, oxidation resistance, and good mechanical strength. A2 SS is the most common stainless grade for general-purpose fasteners and is suitable for indoor and most outdoor applications.
Available UNC thread sizes are #2-56, #4-40, #6-32, and #8-32. These are standard Unified National Coarse (UNC) threads used widely in American mechanical and electronic assemblies.
Available lengths vary by thread size: #2-56 comes in 3/16" to 5/8"; #4-40 in 3/16" to 1"; #6-32 in 3/16" to 1-1/2"; #8-32 in 1/4" to 1-1/2". Select your size and length from the options above.
These screws use a Phillips (cross) drive. A #1 Phillips driver is typically used for #2 and #4 screws, while a #2 Phillips driver is standard for #6 and #8. Use the correct bit size to prevent cam-out and head damage.
UNC (Unified National Coarse) threads have fewer threads per inch than UNF (Unified National Fine). UNC threads are faster to assemble, more tolerant of dirt and damage, and are the standard choice for general-purpose fastening in electronics, machinery, and structural assemblies.
Yes. #2-56 and #4-40 are the most common thread sizes in electronics and PCB enclosure assemblies. A2 stainless steel is non-magnetic (in its annealed state) and corrosion-resistant, making it suitable for sensitive electronic environments.
A2 stainless steel offers good corrosion resistance for most outdoor environments. For highly corrosive or marine environments with constant saltwater exposure, A4 (316 SS) stainless steel is generally recommended.
Choose 50 pcs for small projects, prototyping, or repair work. Select 100 pcs for production runs, maintenance stock, or larger assembly jobs where bulk quantity offers better per-unit value.
