Button Head Socket Screw with Washers M3x8 10B21 Carbon 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 | 10B21 Carbon Steel |
| Grade | Grade 10.9 |
| Diameter | M3 |
| Length | 8 mm |
| Surface Finish | Black |
| 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 fastener assembly
This is a fastener assembly in 10B21 Carbon Steel, at strength class Grade 10.9, supplied black, with an M3 thread and a 8 mm 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 fastener assembly arrives with the washer already on the screw, which removes one loose part from the assembly line and one from the parts bin. Used on volume assembly work — appliances, electronics, furniture and automotive trim — where handling time per fixing matters.
A coloured finish, in most cases a dyed passivate over a zinc layer or a dyed organic film. Appearance plus light corrosion protection.
M3 is a metric thread with an 3 mm nominal diameter and a coarse pitch of 0.5 mm (ISO 261). A standard hex head takes a 5.5 mm spanner across the flats.
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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