Threaded Tail Taper Pin

Threaded Tail Taper Pin — Product Introduction

The threaded tail taper pin (also called threaded tail taper pin or externally threaded taper pin) is a locating fastener with a tapered body at one end and an external thread at the other end. The tapered part has a standard taper of 1:50 and forms an interference fit with a reamed tapered hole in the connected parts, achieving precise radial positioning and self-locking wedging. The thread at the tail is used to cooperate with a nut to provide axial locking force or for pull-out disassembly. This product is specially used for locating connections in blind holes or situations where direct knocking out is difficult.

1. Product Features

• Taper self-locking positioning: The pin body has a standard 1:50 taper. After being driven into the reamed tapered hole, it generates radial interference pressure, forming a tight fit without clearance, with high automatic centering accuracy, effectively limiting radial displacement and circumferential rotation of parts.
• Tail thread structure: The small end has an external thread. After assembly, the thread extends outside the workpiece and can be fitted with a nut for locking or used for pull-out disassembly.
• Blind hole specific design: Unlike ordinary cylindrical pins or taper pins, the threaded tail taper pin specifically solves the positioning and disassembly problems of blind holes or closed cavity parts. During maintenance, there is no need to knock it out from the other end of the hole; it can be removed by unscrewing the nut or using the thread for pulling.
• Specifications and materials: Nominal diameters cover 5–50 mm, with a wide length range. Common material is free-cutting steel; for heavy-load conditions, 35#, 45# steel or alloy steel with quenching treatment can be selected. Stainless steel versions commonly use 304 and 316.

2. Product Advantages

• High positioning accuracy: The tapered surface fit eliminates the clearance problem of cylindrical pins and can ensure the accuracy of long-term repeated assembly of gearboxes, molds, flanges, shaft seats and other components, with strong resistance to vibration displacement.
• Convenient disassembly: The tail thread design is the core advantage. For blind hole installation, traditional pins are difficult to remove, while the threaded tail taper pin can be easily disassembled by screwing in a nut or using a pulling tool, avoiding damage to the hole wall.
• Bears combined loads: The self-locking wedging structure generated by the tapered interference can simultaneously bear shear force and a small amount of torque, suitable for applications requiring both positioning and fastening functions.
• Complete specification system: Nominal diameters cover 5–50 mm, and lengths range from 40 mm to over 400 mm, meeting different needs from small precision tooling to heavy mechanical equipment.

3. Scope of Application

• Mechanical equipment and housings: Connections of housing parts requiring precise centering and positioning, such as gearboxes, bearing seats, reducers, pumps and valves.
• Molds and fixtures: Parts in mold plates, stamping fixtures and inspection tools that require repeated assembly and disassembly while maintaining positioning accuracy.
• Ventilation fans and impellers: Fastening connections between impeller shaft discs and rear discs, using taper pins to eliminate relative displacement during operation and improve impeller life.
• Building curtain walls and structural parts: Applications requiring concealed positioning connections, such as curtain wall beams and embedded parts.
• General mechanical assembly: For any non-through hole or hole where it is difficult to drive out a pin, as well as positioning connections that need to transmit small loads, threaded tail taper pins can be used.