UNJ thread mainly used in aeroplane and spacecraft industry. “UNJ” the UN means United Inch thread, “J” means rounded root of external thread. UNJ thread greatly improve the Anti fatigue strength. Class of fit: ring 3A, plug 3B
Nuts, Self-Locking, Steel High Strength, All Metal 450 °F Use, UN and UNJ Thread Formdoi:SAE AS7252A本规范涵盖由碳钢或低合金钢制成的所有金属,自锁扳手螺母,板形螺母,柄形螺母和组合槽形螺母.
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SCREW-THREAD STANDARDS FOR FEDERAL SERVICES SECTION 20 INSPECTION METHODS FOR ACCEPTABILITY OF UN, UNR, UNJ, M, AND MJ SCREW THREADSdoi:FED FED-STD-H28/20B