4-40 machine screws - Exporter for Global Purchases
I source and stock {4-40 machine screws} in carbon steel, stainless steel, and alloy options to meet your assembly needs. As a buyer-focused exporter, I understand that you want reliable fasteners with consistent thread pitch, length, and head style. When you choose me, you can {Buy} with confidence because I provide traceable mill test reports, tight tolerances, and corrosion resistance coatings like zinc or black oxide. I offer long and short versions, various head types (socket cap, pan, and other common styles), and bulk packaging for OEMs and distributors. My turnaround is fast, shipments are ready for export, and I handle all export documentation to ensure smooth cross-border delivery for {Exporter} customers. If you need a quote today, I respond quickly with competitive pricing, MOQ options, and possible custom finishes. Let me earn your trust with quality, consistency, and service you can rely on for your next project with {4-40 machine screws}.
4-40 machine screws Sets the Industry Standard More Than a Supplier - A Partner
Choosing the right fasteners for electronics, appliances, and precision instruments hinges on more than price. 4-40 machine screws are a compact, versatile standard that fits a wide range of assemblies. A well‑curated 4-40 set offers the right head style, thread tolerance, and finishes to ensure consistent fit and reliable performance across markets. For global buyers, a complete kit—with mixed lengths, accompanying nuts and washers, and clear, region-friendly packaging—reduces handling steps and speeds production while maintaining clear traceability for quality audits. As a partner to international procurement, we focus on consistent supply, rigorous quality control, and flexible logistics. From material certification and lot tracing to RoHS/REACH compliance and corrosion‑resistant finishes, each screw is manufactured to standard and inspected to spec. We tailor sets to customer needs, optimize packaging for regional distribution, and streamline lead times with scalable capacity. The result is more than a set of fasteners—it is a dependable, last-mile partnership that helps you ship products faster with less risk.
| Variant | Thread Size | Major Dia (in) | Pitch (in) | Material | Finish/Coating | Head Type | Drive Type | Length (in) | Tensile Strength (ksi) | Standard/Specification | Typical Applications |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 304 Stainless – Pan Head, Slotted | 4-40 UNC | 0.112 | 0.025 | 304 Stainless Steel (18-8) | Polished | Pan | Slotted | 1/4 | 75 | ASME B18.3.1 | Electronics, precision devices assembly |
| 316 Stainless – Flat Head, Phillips | 4-40 UNC | 0.112 | 0.025 | 316 Stainless Steel | Polished | Flat | Phillips | 3/8 | 75 | ASME B18.3.1 | Marine equipment, exposed electronics |
| Carbon Steel Grade 2 – Socket Head Cap | 4-40 UNC | 0.112 | 0.025 | Carbon Steel Grade 2 | Zinc Plated | Socket Head Cap | Hex (Allen) | 1/2 | 60 | ASME B18.3.1 | Industrial equipment, general assembly |
| Brass – Round Head, Slotted | 4-40 UNC | 0.112 | 0.025 | Brass | Natural Brass | Round | Slotted | 1/8 | 50 | ASME B18.3.1 | Instrumentation, electronics hardware |
| Stainless 303 – Pan Head, Phillips | 4-40 UNC | 0.112 | 0.025 | Stainless Steel 303 | Passivated | Pan | Phillips | 3/8 | 72 | ASME B18.3.1 | Automotive electronics, control panels |
| Alloy Steel – Black Oxide – Socket Head | 4-40 UNC | 0.112 | 0.025 | Alloy Steel | Black Oxide | Socket Head | Hex (Allen) | 1 | 110 | ASME B18.3.1 | Heavy machinery, mechanical assemblies |
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