JIS Option Flat Head Hex Socket Head Cap Screws

These JIS-option flat head hex socket cap screws are used in injection mold base and accessory tooling where a low-profile fastener is required. The flush flat head helps prevent interference with adjacent mold plates, shutoff surfaces, or moving components, while the hex socket drive enables controlled tightening even in confined assembly areas.

Common scenarios include:

• Plastic mold base and bolster mounting: coarse threads provide reliable engagement for general-purpose clamping of plates and brackets.
• Automatic peripheral equipment and fixtures: conventional (E dimension space saving standard) variants help maintain clearance in compact mold layouts.
• Industrial molding systems exposed to shop air: the black oxide finish is suited to reduce corrosion risk under typical handling and maintenance conditions.

With 10.9 steel construction, the screws are selected for robust torque resistance, supporting stable long-term clamping in routine mold maintenance cycles.

The fastener is made from 10.9 steel, a high-strength alloy steel intended to deliver strong tensile and torque capacity for clamping in mold tooling. The black oxide surface treatment improves corrosion resistance for standard workshop environments, helping protect the screw during storage, assembly, and maintenance.

• Strength vs. toughness: the 10.9 class emphasizes higher strength; in practice this supports dependable preload, though it requires proper tightening procedures to avoid over-stressing.
• Wear considerations: for a cap screw used mainly in clamping (not sliding wear), wear is typically not the limiting factor; corrosion protection and thread condition are more important.
• Heat treatment state: the provided data specifies the strength class (10.9) but does not list an explicit quench-and-temper or nitriding condition.

If you need a specific hardened/tempered or coating specification for extreme environments, confirm the required heat-treatment document and coating thickness with your supplier before design freeze.

Select by matching the screw’s nominal M diameter, thread engagement style, and length L to the stack-up of your mold component thicknesses. This series supports M4, M5, M6, M8, and M10, with L = 10 to 50 mm, enabling a wide range of fastening depths for mold plates, adapters, and accessories.

• Diameter (M): choose the nominal size required by your mounting hole spec and clamp force target.
• Thread range: use full thread when you need maximum thread engagement through the stack; choose with incomplete threaded part to leave an unthreaded shank section for centering or to avoid thread exposure across a locating interface.
• Head type: the flat head allows flush mounting in counterbored or flat seat regions—ensure the seat geometry is compatible to prevent rocking.

For tolerance and fit, follow your standard mold assembly practice: match clearance/engagement to the threaded insert or tapped hole. The exact tolerance class is not provided in the input data, so verify with your internal fastener standard or drawing requirements before release.