M1–M4 Black Carbon Steel Phillips Pan Head Screw Bolt — GB818 Small Round Head

GB818 black carbon steel Phillips pan head screws are the standard miniature fastener for electronics assembly, precision devices, and PCB mounting where a black finish is required. Available from M1 — the smallest standard metric thread — through M4, these screws cover the full range of miniature and small electronics assembly applications at an economical price point.

Key Specifications

Parameter	Value
Material	Carbon Steel
Finish	Black oxide
Drive	Phillips (cross head)
Head Style	Pan head (round head)
Size Range	M1, M1.2, M1.4, M1.6, M2, M2.5, M3, M4
Thread Type	Machine thread (metric)
Standard	GB818

Why Choose GB818 Black Pan Head Screws?

Miniature M1–M4 range — covers the smallest standard metric threads for precision instruments, cameras, and miniature electronics
Black oxide finish — professional black appearance for dark electronics builds; light corrosion resistance for indoor use
Pan head profile — standard round head with good bearing surface; suitable for most electronics and mechanical assembly applications
GB818 standard — Chinese national standard equivalent to ISO 7045 / DIN 7985; widely specified in electronics manufacturing
Economical — carbon steel construction provides cost-effective fastening for high-volume electronics assembly

Typical Applications

PCB mounting and electronics enclosure assembly (M2–M3)
Precision instrument and optical equipment assembly (M1–M2)
Toy and model assembly (M1.4–M3)
Consumer electronics repair (M1.6–M3)
Miniature robotics and servo bracket mounting (M2–M4)
Camera body and lens assembly (M1–M2.5)

Compatible With

Phillips screwdrivers: #000 (M1–M1.6), #00 (M2–M2.5), #0 (M2.5–M3), #1 (M3–M4)
Pre-tapped holes or hex nuts M1–M4
Nylon, brass, and aluminium standoffs M2–M4

Package Contents

GB818 pan head screws in selected size, length, and quantity (per variant)

Frequently Asked Questions

Q: Is the black oxide finish rust-proof?: A: Black oxide provides light corrosion resistance suitable for dry indoor environments. It is not suitable for outdoor, marine, or high-humidity applications. For those environments, choose 304 stainless steel variants.
Q: What is the smallest screw size available?: A: The smallest size is M1 (1mm diameter), suitable for miniature precision instruments, camera assemblies, and miniature electronics. Use a #000 Phillips screwdriver for M1 and M1.2 screws.
Q: What is the GB818 standard?: A: GB818 is the Chinese national standard for cross-recessed (Phillips) pan head machine screws, equivalent to ISO 7045 and DIN 7985. It specifies head dimensions, thread tolerances, and mechanical properties for metric pan head screws.