Search results
Screw Thread Design - Fastenal UNJ thread is a thread form having root radius limits of 0.150 to 0.180 times the thread pitch. With these enlarged radii, minor diameters of external thread increase and intrude beyond the basic profile of the UN and UNR thread forms.
UNJF - Unified Fine Threads. UNJF Thread Series, is suitable for the production of bolts, screws, and nuts for aerospace applications where the Root Radius is controlled. External threads of this series have greater tensile stress area than comparable sizes of the Coarse series.
The UNJ screw thread is intended for threaded parts and used in weight sensitive applications requiring high fatigue strength, resistance to vibration, and where parts are physical size, and strength sensitive.
The UNJF thread table shows selected thread sizes whose dimensions correspond to the UNF templates. The thread designation in the UNJF thread table is made up of the abbreviation UNJF and the outside diameter in inches.
YAMAWA has assorted "ZELX series" taps for threading stainless steel, titanium alloys and nickel-based alloys that are used in many aircraft parts. Spiral Pointed Taps for Stainless Steels
This International Standard specifies the general requirements and limit dimensions of inch series UNJ threads with controlled root radius for aerospace construction.
The UNJ thread standard (ASME B1.15) defines a system of threads for highly stressed applications requiring high fatigue strength. It was derived from a military specification (MIL-S-8879) originally published in December 1965.
