M3 M4 M5 A2 Stainless Steel Lifting Eye Bolts with Nuts, Washers & Spring Washers

Measure the thickness of the material you are threading into, then select a bolt length that provides at least 1.5× the thread diameter of engagement beyond that thickness. For example, an M4 bolt threading into 10mm of material generally needs at least 16mm of total length. Lengths in this listing range from 9mm (≈3/8") to 60mm (≈2-3/8") depending on the diameter — select the size that gives you adequate thread engagement without bottoming out.

Working load limits vary by size and installation. As a general guideline, small metric eye bolts in the M3–M5 range are typically suited for light-duty rigging, cable management, and equipment anchoring rather than heavy overhead lifting. Always consult a load table for your specific size and never exceed the rated working load. These bolts are not certified for overhead lifting of personnel.

A2 stainless steel (304-equivalent) offers good corrosion resistance in most outdoor and mildly marine environments, including rain, humidity, and occasional salt spray. For highly aggressive saltwater immersion or chemical exposure, A4 (316) grade stainless is generally recommended. In most DIY outdoor and workshop applications, A2 performs well without additional treatment.

These bolts use standard ISO metric coarse threads (M3, M4, or M5). The included nuts and washers are matched to the same metric thread, so no conversion hardware is needed. They are compatible with any standard metric coarse nut or tapped hole of the same size. They are not compatible with UNC/UNF (imperial) threads.

Each set includes one lifting eye bolt, one matching hex nut, one flat washer, and one spring (split-lock) washer — all in A2 stainless steel. The quantity option you select (1, 2, 3, 5, or 10 pcs) refers to the number of complete sets, so ordering 5 pcs gives you 5 eye bolts, 5 nuts, 5 flat washers, and 5 spring washers.

Standard lifting eye bolts are generally designed for in-line (vertical) loading. Angular loading significantly reduces the safe working load — typically by 25–75% depending on the angle from vertical. If angled loading is required in your application, consider using swivel eye bolts specifically rated for angular loads. For straight vertical pulls in light-duty applications, these bolts are generally suitable.

Yes. The included split-lock (spring) washers are designed to resist loosening caused by vibration by biting into both the nut face and the mating surface when the nut is tightened. For high-vibration applications, combining the spring washer with a thread-locking compound is generally recommended for added security. In most light-duty and moderate-vibration scenarios, the spring washer alone provides effective resistance to loosening.