polyypin

Polypin refers to a type of fastener commonly used in upholstery and furniture construction. It is characterized by its T-shaped head and a long, slender shank, designed to be hammered or pressed into materials. The head of the polypin typically has a flat top, allowing for easy driving, and a slightly wider flange that helps to secure the material. The shank is usually smooth or slightly ribbed to provide grip.

Polypins are often employed to attach fabric or other coverings to wooden frames. Their design allows for a strong, flush connection without the need for pre-drilling. They are particularly useful for applying fabric to curved surfaces or in areas where a clean aesthetic is desired. The depth to which the polypin is driven can be controlled to achieve the desired tension and fit of the material.

While not as common as staples or nails in some applications, polypins offer advantages in terms of ease of use and the finished appearance they provide. They are often found in the manufacturing of upholstered chairs, sofas, headboards, and decorative panels. The term "polypin" itself may be a specific brand name or a colloquialism that has become widely adopted for this type of fastener.