D1 D P 60° UNJF Unified fine thread SAE AS8879D Recommended Drill Sizes for Tapping Internal UNJ Threads Threads for the aerospace industry Nominal size （inch） D P min [inch] max [inch] Drill size Decimal inch UNJ thread is a thread form having root radius limits of 0.150 to 0.180 times the thread pitch. The Basic Minor Diameter of an internal thread essentially defines the maximum material condition, or in practical shop terms the tap drill size for a 100% thread. I have the proper insert for the "J" threads and have a .375-24 UNJF-3A "go" thread ring gage, but for the no-go gage I only have a .375-24 UNF-3A (not J). With these enlarged radii, minor diameters of external thread increase and intrude beyond the basic profile of the UN and UNR thread forms. Each thread in the series is characterized by its major diameter D maj and its pitch, P.UTS threads consist of a symmetric V-shaped thread. The outermost 1 ⁄ 8 and the innermost 1 ⁄ 4 of the height H of the V-shape are cut off from the profile. RE: .8125-16 UNJ-3A External Thread BillPSU (Industrial) 29 Dec 13 22:37 You are going to have to do some testing by making various pitch diameter parts, identifying the parts and then plating the parts. Nominal Size ø d1 UNC UNF UNEF UNJC UNJF M MF MJ NPSM NPSC NPSF Rp_ (BSPP) G STI-UNC STI-UNF STI-M LK-UNC LK-M BSW BSF Pg Tr Tr-F Rd inch Fraction Wire letter mm 0.3465 8.800 M10x1.25 G … I'm making some parts with a .375-24 UNJF-3A threads. 3.3.1.3 Special UNJ Thread Data: Dimensions for threads of special diameter-pitch combinations shall be computed from the formulas in Table 9. Minor diameter: The maximum and minimum sizes of the smallest diameter of the screw threads Over wires distance: these are the maximum and minimum distances if using 3 wires of the same size to measure the dimension close to the pitch diameter of an external thread. In the plane of the thread axis, the flanks of the V have an angle of 60° to each other. Can I use a UNJF go and a UNF no-go gages to check the threads, or do I need to have UNJF … This SAE Aerospace Standard (AS) specifies the characteristics of the UNJ profile inch series of screw threads, to include a mandatory controlled radius of 0.18042P to 0.15011P at the root of the external thread and with the minor diameter of both external and internal threads increased to provide a basic thread height of 0.5625H in order to accommodate the external thread … The pitch P is the distance between thread … Thread Major Diameter Thread Per Inch Pitch Diameter Minor Diameter Male Thread Minor Diameter Female Thread; 13/16: … Unified Thread Series 16 TPI ANSI/ASME B1.1, Unified Extra Fine Thread Nominal thread sizes from 1 5/8-6 UN to 1 15/16-20 UN 2-4½ UNC to 2¾-20 UN: Nominal thread sizes from 2-4½ UNC to 2¾-20 UN 2 7/8-6 UN to 4-16 UN: Nominal thread sizes from 2 7/8-6 UN to 4-16 UN ... c UN series external thread, Max.Diameter = Basic - Allowance, for Class 1A and 2A = Basic for Class 3A: … 3.3.2 External threads: External threads shall be of Unified form, in … The basic Minor Diameter of the UNJ internal thread is the basic Major Diameter - 2 x basic Single Depth = Major Diameter - 1 1/8 x Pitch x Cosine 30 degree. Characteristics shall include pitch diameter size, major diameter size, and minor diameter size.
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