Technical Guides

Importing fasteners from China to Kazakhstan? This guide covers EAC certification, GOST vs DIN standards, rail and truck transit via Khorgos, payment terms and QC checks for EAEU buyers.

Specifying threaded pipe fittings to ASME B16.11 or DIN 2999? This guide compares NPT vs BSPT vs BSPP threads, pressure classes 2000-9000, materials A105 vs F304 vs F316, and the mistakes that leak at startup.

Choosing rigging hardware? Compare wire rope clips, shackles, eye bolts and turnbuckles on load rating, installation method, materials and corrosion class so you specify the right part for lifting, tie-down and tensioning.

Choosing between blind rivets, solid rivets and R-clips? Compare load capacity, installation access, materials and cost so you can pick the right fastener for sheet metal, structural joints and quick-release pins.

Why the Checklist Matters China produces more fasteners than the rest of the world combined — which means for every serious manufacturer there are a dozen trading companies with a polished website and no factory behind it. The difference shows up six months later, in thread tolerances, coating thickness and heat-treatment consistency. This checklist is

Why Pre-Shipment Inspection Exists Once a container of fasteners leaves the port, discovering a wrong grade or a bad coating costs you the freight twice — once going and once coming back. Pre-shipment inspection (PSI) is the buyer’s last cheap chance to verify the goods, and for a technical product like fasteners it is not

Three Numbers, Three Different Questions When a bolt datasheet lists proof load, yield strength and tensile strength, it is answering three different questions: how much load can this bolt take without changing at all (proof), where does it start to stretch permanently (yield), and where does it finally break (tensile). Confusing them leads to two

Packaging Is Part of the Product A bolt that arrives at your warehouse with threads burred, zinc rubbed off and labels gone is a rejected lot even if the steel underneath is perfect. Export packaging for bulk fasteners is a solved problem — but only if the buyer specifies it. This guide covers the standard

What Is Thread Pitch? Thread pitch is the distance between two adjacent thread crests, measured in millimetres for metric threads. An M12 bolt with a 1.75 mm pitch means one full turn advances the bolt 1.75 mm. Every metric size has a default coarse pitch (what you get when nobody specifies otherwise) and one or

Two Hex Fasteners, Two Different Jobs The hex head bolt and the socket head cap screw (SHCS, DIN 912) both have six-sided driving interfaces, but they are engineered for different assembly philosophies: the hex bolt for open, wrench-accessible joints, and the socket screw for compact, counterbored machinery joints. Choosing between them comes down to access,