What Are The Non-Detachable Fasteners?

As the most common connecting components, fasteners come in a wide variety. Among them, the non-detachable fasteners mainly include solid rivets, blind rivets, tie bolts, lock bolts, pallet nuts (rivet nuts), etc. The characteristics and application scenarios of different types are detailed below.

1. Solid Rivets: Parts that connect the riveted components through their own deformation or interference fit. Solid rivets are generally made of aluminum, copper, iron and other materials, and most of their surface treatment is white zinc plating. The connection of components using rivets is a rigid connection and belongs to a non-detachable connection. Small rivets can be cold-riveted, while large rivets need to be hot-riveted in a red-hot state. Solid rivets are widely used in fields such as knives, stationery books, locks, helmets, automotive hardware, luggage, strollers, automotive clutch steel plates, motorcycle accessories and household appliances.

2. Blind Rivets: A type of rivet used for single-sided riveting, which must be riveted with a special tool - a riveter (manual, electric or pneumatic). During riveting, the rivet mandrel is pulled by a special riveter to expand the rivet body, thereby achieving riveting and fixing. This type of rivet is especially suitable for occasions where ordinary rivets (which need to be riveted from both sides) are inconvenient to use, so it is widely used in products such as construction, automobiles, ships, aircraft, machinery, electrical appliances and furniture. Among them, open-type oval head blind rivets are the most widely used; countersunk head blind rivets are suitable for riveting occasions where the surface requires flatness and smoothness; closed-type blind rivets are suitable for riveting occasions with high load requirements and certain sealing performance.

3. Tie Bolts: Tie bolts (also known as through-wall bolts) are generally round steel bolts with threads at both ends, or flat steel with long holes left at both ends, which are fixed and wedged by inserting wedge-shaped iron. It should be noted that bolts are a type of railway accessories, and railway accessories are an important part of railway lines, mainly including steel rails, sleepers, connecting parts, ballast, anti-creep devices, rail supports and turnouts, etc. As an integral engineering structure, the track is laid on the subgrade, which not only plays a guiding role for train operation, but also directly bears the huge pressure of locomotives, vehicles and their loads. Tie bolts are widely used in railway engineering and building formwork support and other scenarios.

4. Lock Bolts: A lock bolt is composed of a lock core, a lock body, a lock wall and a bolt. By virtue of the close combination of the bolt and the lock body, it can prevent outdoor facilities from being easily disassembled and stolen, thereby improving the safety and firmness of the user's facilities. It is mostly used for the connection of outdoor protective equipment.

5. Pallet Nuts: A fastener that can pre-install the nut on the aircraft component in advance, and no tool is needed to fix the nut when installing the screw or bolt. It is usually composed of a self-locking nut and a pallet supporting the nut. If the nut and the pallet are an integral structure, it is called a fixed pallet nut; if the nut is clamped on the pallet, it is called a floating pallet nut. There are 3 holes (1 large and 2 small) on the pallet of the pallet nut. The large hole is used for the subsequent installation of screws or bolts, and the 2 small holes with a diameter of 2.38mm are used for installing the pallet nut on the component.