340/500pcs M3 Phillips Pan Head Screws Self Tapping Drilling Screws Assortment Kit Carbon Steel 6mm 8mm 10mm 12mm 16mm 18mm 20mm(340pcs)

Specification:Material: carbon steelColor: black500 pcs, M3 screws, self-tapping, pan head, self-drilling, 6/8/10/12/16/18/20 mm, carbon steelSize: M3*6DIY use: ElectricityModel：M3 screwsHead type : Flat headScrew type : Wood screwsPacking : 300-499 piecesMaterial : Carbon steel

• Specification combination and quantity distributionClearly label the total number of kits (e.g., 340pcs or 500pcs), break down the specific allocation of each screw by length (e.g., 6mm x 50pcs, 8mm x 70pcs, etc.), and indicate the M3 uniform thread specifications to avoid generalized descriptions of the mixed sizes.
• Carbon steel material and hardness certificationIndicate the grade of carbon steel (e.g., 1008/1010) and compliance standards (e.g., ASTM A307/DIN 7981), provide surface hardness parameters (e.g., HRC 45-50) and zinc coating thickness (≥8μm), with salt spray test results (e.g., no red rust for 72 hours).
• Cross recess and self-tapping designSpecify the cross slot specification (PH2/PHA2) and slot depth tolerance (±0.05mm), specify the thread type of the self-tapping end (e.g. type B/AB) and the lead angle (30°±2°), and specify the drilling capability (e.g. no pre-drilling of holes in 1.5mm-thick steel plates).
• Applicable substrates and load limitationsList the suitable materials (e.g. PVC board, mild steel, pine), mark the maximum axial tension (e.g. M3 × 20mm ≥ 600N) and the recommended drilling diameter (1.8-2.0mm), indicating that it is not applicable to hardened steel or glass fiber reinforced plastics.
• Sorting Packaging and Labeling DetailsDescribe the way of kit separation (e.g. individual sealed bag + compartmentalized plastic box), mark the printed content of each package size label (including length/quantity/ISO code), and explain the anti-mixing design (e.g. color ring marking or bag separator clips).