Stainless Steel Expansion Tube Bolts M6 M8 M10 M12 | 201 & 304 | 48mm–63mm

Match the bolt diameter to your pre-drilled hole size. M6 (≈1/4" diameter) is typically used for light-duty anchoring in thin masonry or drywall backing; M8 (≈5/16") and M10 (≈3/8") suit medium-load applications in concrete or brick; M12 (≈1/2") is generally chosen for heavy structural anchoring. The 48–63mm length range accommodates most standard wall thicknesses — measure your substrate depth and add the required embedment depth before selecting.

Load capacity depends on the bolt size, substrate material, and installation depth. In general, M6 bolts in solid concrete typically support light fixtures and shelving; M8–M10 handle medium loads such as handrails and equipment brackets; M12 is suited for heavier structural connections. Always consult a structural engineer for safety-critical applications and refer to the specific load ratings for your substrate type.

Yes. Both grades are corrosion-resistant, but 304 stainless steel offers significantly better rust resistance and is generally recommended for outdoor, coastal, or high-humidity environments. 201 stainless steel is suitable for indoor or low-moisture applications where occasional exposure to moisture may occur. For marine or heavily chlorinated environments, contact us to confirm the best grade for your use case.

201 stainless steel uses manganese instead of nickel, making it more affordable while still offering good corrosion resistance for indoor use. 304 stainless steel has a higher nickel content, providing superior corrosion resistance — especially in outdoor, marine, or chemically exposed environments. For long-term outdoor installations or areas with salt air exposure, 304 is the recommended choice.

These bolts use standard metric (ISO) threads — M6, M8, M10, and M12 — which are compatible with the vast majority of metric nuts, washers, and threaded inserts used in construction and DIY projects across the US and internationally. No adapters are needed when pairing with standard metric hardware.

We offer flexible pack quantities: 1, 2, 3, 4, 5, 10, 15, or 20 pieces per order. For single repairs or testing a fit, the 1-piece option works well. For larger installations such as mounting shelving units, fence posts, or equipment racks, the 10–20 piece packs generally offer better value per bolt. Select your quantity using the "Pack of Quantity" option above.

These expansion tube bolts are generally compatible with solid concrete, brick, block, and masonry substrates. They are not typically recommended for hollow walls or soft materials like drywall alone. Always ensure the substrate is solid enough to allow the expansion mechanism to grip securely. If you are unsure about your substrate, contact us before ordering.