DIN 439 Type B - Hexagon Thin Nuts, Metric Fine Pitch
This datasheet provides technical specifications, dimensions and tolerances for metric fine pitch hex thin nuts available from Westfield Fasteners, in accordance with DIN 439.
DIN 439 Type B hexagon thin nuts, also known as half nuts or jam nuts, have a reduced height compared with standard hexagon nuts and feature chamfered edges.
They are commonly used where installation space is restricted or as part of a double-nut locking arrangement.
These nuts feature a metric fine-pitch thread, providing a smaller thread pitch than the corresponding standard metric coarse thread. They must be used with bolts, screws or threaded components having the same nominal diameter and thread pitch.
DIN 439 specifies dimensions and tolerances for hexagon thin nuts with metric threads, distinguishing between Type A (unchamfered) and Type B (chamfered) designs.
This datasheet covers Type B nuts with metric fine-pitch threads.
DIN 439 has been superseded by ISO specifications, including ISO 8675 for metric fine-pitch hexagon thin nuts. Dimensional differences may exist between the DIN and ISO specifications, and compatibility should be confirmed before substituting one type for another.
