China M22 metal lock nut for heavy machinery Factory

The name “butterfly nut” comes from the nut's handle resembling butterfly wings. Butterfly nuts are easy to install and remove, as they can be tightened or loosened by hand, hence they are also called hand-tightening nuts. Common materials include 304/316 stainless steel, zinc-plated carbon steel, and nylon 66. Standard sizes range from M3 to M24, making them widely applicable.

Hot-dip galvanized bolts and Dacromet bolts have distinct differences, such as in materials, manufacturing methods, and operating environments. After undergoing specialized processing, these two types of bolts exhibit significant differences in corrosion resistance, which is the most notable distinction between them.

What are blind rivets? Blind rivets are a type of single-sided rivet that requires a rivet gun (manual, electric, or automatic) for installation. These rivets are suitable for applications where standard rivets (which require riveting from both sides) are impractical, and are widely used in products such as construction, automotive, marine, aerospace, machinery, electrical appliances, and furniture.

In the vast majority of ordinary mechanical equipment, protruding screw heads are common, but in high-end precision equipment, automated tooling, and precision molds, exposed screws are virtually nonexistent. This is not for aesthetic reasons, but rather a mandatory, unspoken standard in the precision industry. The core reason lies in the “hidden” assembly logic of set screws.

Sealing failure and water leakage in metal roof and solar projects are mostly caused by ordinary split rubber gaskets with poor weather resistance. This technical guide systematically introduces the structure, material features, surface craftsmanship and stock specifications of metal-EPDM bonded washers. It compares key performance differences between common rubber washers and EPDM composite washers in salt spray resistance, UV aging resistance, high and low temperature tolerance, compression stability and on-site assembly. Combined with real outdoor working conditions, the article explains how the integrated vulcanized structure solves common pain points such as gasket crushing, offset installation and long-term aging failure. It provides professional and practical selection guidance for global fastener buyers and engineering contractors.

Jiaxing Aoke Hardware successfully concluded IFE 2026 Phoenix. At the expo, we showcased custom stamping parts as our core products, alongside non-standard fasteners and EPDM sealing components. Our EPDM products attracted great attention from US buyers. We officially launched our High‑Grade Material nickel-alloy product line, including Inconel 718 hex nuts with ultra-high strength and Inconel 625 fasteners featuring superior corrosion resistance, a widely used nickel-base alloy for chemical industry. These nickel alloys outperform regular stainless steel and suit extreme working conditions. More than a hardware trader, we deliver drawing-based custom stamping, special fastener development and one-stop hardware sourcing service with flexible manufacturing and supply-chain risk control. All on-site drawing inquiries and project leads are under systematic follow-up. Welcome to share your drawings for cooperation discussions.