M6 M8 M10 M12 Stainless Steel Expansion Anchor Bolts — Hex, Socket & Phillips Head

Match the bolt diameter to your anchor sleeve or pre-drilled hole size. For example, an M8 bolt typically requires an 8mm hole. For length, a general rule is that the bolt should penetrate the base material by at least 5–10 times the bolt diameter — so an M8 bolt generally needs at least 40–80mm of embedment depth. When in doubt, go longer for a more secure hold. In inches: M6 ≈ 1/4", M8 ≈ 5/16", M10 ≈ 3/8", M12 ≈ 1/2".

Load capacity depends on the bolt size, embedment depth, and base material. Larger diameters (M10, M12) and longer lengths generally support higher loads. For structural or safety-critical applications, always consult an engineer and refer to the specific pull-out and shear values for your installation conditions. These bolts are not rated for overhead life-safety applications without professional engineering review.

Yes. These bolts are made from 304 stainless steel, which provides good corrosion resistance in most outdoor and humid environments. They are generally suitable for exterior walls, patios, and covered outdoor structures. For highly corrosive environments such as coastal or marine settings, 316 stainless steel is typically recommended instead.

These bolts use standard metric coarse threads (ISO metric thread standard), compatible with standard metric nuts, washers, and anchor sleeves. M6, M8, M10, and M12 designations refer to the nominal thread diameter in millimeters. They are not compatible with UNC/UNF (imperial) threaded components.

Choose Hex Head or Hex Pan Head for easy installation with a wrench or socket — ideal for general construction and structural anchoring. Socket Cap Head works well in recessed or tight spaces using an Allen/hex key. Phillips Countersunk Head and Hex Countersunk Head sit flush with the surface for a clean, low-profile finish — great for visible installations. Phillips Pan Head offers a low-profile dome shape for general fastening where a flush finish isn't required.

Yes, expansion anchor bolts are specifically designed for use in solid base materials such as concrete, brick, block, and stone. They work by expanding against the walls of a pre-drilled hole when the bolt is tightened, creating a mechanical lock. Always ensure the hole diameter and depth match the bolt specification for a secure installation. They are not suitable for use in hollow or cavity walls without appropriate hollow-wall anchors.

The "M" number refers to the nominal outer thread diameter in millimeters. M6 is approximately 6mm (about 1/4"), M8 is 8mm (about 5/16"), M10 is 10mm (about 3/8"), and M12 is 12mm (about 1/2"). Larger diameters provide greater holding strength and are used for heavier loads and thicker structural members. Choose the smallest diameter that meets your load requirements to minimize hole size in the base material.