UN Button Head Socket Screw 4# 10B21 Carbon Steel

UN Button Head Socket Screw 4# 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.

Technische Daten

Bestellung & Versand

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Über diese Schraube

This is a screw in 10B21 Carbon Steel, at strength class Grade 10.9, supplied black oxide (hardened), 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.

Black oxide on a hardened 10.9 / 12.9 part: stays within tight tolerances, adds mild corrosion resistance and avoids the hydrogen embrittlement that acid zinc plating can cause on high-strength steel.

A non-metric or special bore size. Confirm the thread form and tolerance with us before you specify it into a design.

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.