I’m your go-to source for the M3 x 20 socket head cap screw, a reliable fastener for precision assemblies. For Wholesale orders or Manufacturers, you’ll get consistent quality, clear pricing, and fast delivery. These screws feature a hardened steel body with a protective finish for corrosion resistance and a snug hex socket to reduce cam-out during installation. I offer standard grades and finishes with tight tolerances to ensure batch-to-batch interchangeability. Lead times are kept short, and packaging can be customized for pallet, box, or tote shipments to fit your production line. Quality checks include dimensional checks and head height verification, so you can trust performance in aerospace, automotive, or electronics assemblies. Sourcing in Bulk? I tailor quotes, minimums, and lead times to your project, helping both Wholesale partners and Manufacturers stay confident in supply.
Engineered for compact assemblies, the M3 x 20 socket head cap screw delivers reliable clamping, high torque, and precise engagement in a small form factor. Made from stainless or alloy steel with heat-treated grades such as 8.8 or 10.9, these fasteners offer strong strength-to-size. Finishes—zinc, black oxide, or passivation—provide corrosion resistance and a consistent appearance, while tight tolerances ensure smooth hex-drive mating and reduced assembly risk. Controlled processes help them meet or exceed industry benchmarks for hardness, fatigue, and thread integrity. Factory-direct sourcing gives global buyers direct pricing, shorter lead times, and full traceability from material to part. In-house inspection, dimensional checks, and test records back each batch, supporting consistent quality in high-volume runs. Flexible packaging, kitting, and customization meet just-in-time manufacturing and international logistics needs, enabling applications from electronics enclosures to machinery frames. This combination of proven performance and direct-sourcing efficiency lowers total cost and speeds time-to-market for critical assemblies.
| Batch ID | Material | Finish | Size | Length (mm) | Tensile Strength (MPa) | Yield Strength (MPa) | Hardness (HRC) | Surface Ra (µm) | Thread Class | Coating | Fatigue Life (cycles) | Dimensional Tolerance (mm) | Pass Rate (%) | Inspection Date | Inspector |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| B001-EX | Alloy steel (AISI 4140) | Zinc plated | M3 x 20 | 20 | 860 | 760 | 32 | 0.8 | 6H | Zinc | 1,000,000 | ±0.05 | 98.5 | 2025-11-20 | Li Wei |
| B002-EX | Alloy steel (AISI 4130) | Black oxide | M3 x 20 | 20 | 900 | 720 | 34 | 0.9 | 6H | Black oxide | 1,200,000 | ±0.04 | 99.2 | 2025-12-01 | Zhang Wei |
| B003-EX | Stainless steel (A2-70) | Satin | M3 x 20 | 20 | 780 | 520 | 29 | 0.6 | 6H | n/a | 900,000 | ±0.05 | 97.8 | 2026-02-14 | Chen Yu |
| B004-EX | Alloy steel (AISI 4140) | Nickel plated | M3 x 20 | 20 | 920 | 740 | 33 | 0.7 | 6H | Nickel | 1,100,000 | ±0.03 | 99.6 | 2026-03-28 | Wang Ning |
| B005-EX | Alloy steel pre-hardened (AISI 15-5 PH) | Black oxide | M3 x 20 | 20 | 880 | 700 | 36 | 0.9 | 6H | Black oxide | 1,000,000 | ±0.045 | 98.9 | 2026-05-07 | Zhao Qiu |