Socket Head Cap Screw 4# 40Cr Alloy Steel — stocked and shipped worldwide by SFX Fasteners. Available for single-piece retail orders — no minimum order — dispatched from our own warehouse within 24–48 hours.
Specifications
| Material | 40Cr Alloy Steel |
| Grade | Grade 12.9 |
| Diameter | 4# |
| Thread | Full Thread |
| Surface Finish | Black Oxide |
| Brand | SFX Fasteners |
Ordering & shipping
| Minimum order | No minimum — single pieces welcome |
| Pricing | Order totals are confirmed at checkout, before payment |
| Custom & dropship | Small batches to drawing · blind dropshipping on request |
| Dispatch | 24–48 hours for stock items |
| Shipping | Worldwide, calculated at checkout by weight and destination |
Need a specific size, grade or standard? Send us a quote request — we quote to drawing and to DIN / ANSI / GB / JIS standards.
About this screw
This is a screw in 40Cr Alloy Steel, at strength class Grade 12.9, supplied black oxide, with an 4# thread and a 1/4 in length. Every dimension is stated against the standard named above; where a tolerance class matters to your design, ask us and we will confirm it in writing before you order.
A screw threads directly into the parent material or into a nut, so the thread form, the point and the drive decide what it can be used for. Commonly used on machinery, tooling, appliances, electrical enclosures, furniture and automotive assemblies where the head has to sit low or be driven from one side only.
A non-metric or special bore size. Confirm the thread form and tolerance with us before you specify it into a design.
40Cr is a chromium-alloy quench-and-temper steel, the standard feedstock for grade 8.8 and above in China. It reaches 10.9 and 12.9 after heat treatment.
Sold by the piece, so one is a valid order. Stock lines leave our warehouse within 24–48 hours of cleared payment, and freight is calculated at checkout from the packed weight and the destination.
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