In the plane of the thread axis, the flanks of the V have an angle of 60° to each other. 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). 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. UNJ thread is a thread form having root radius limits of 0.150 to 0.180 times the thread pitch. Can I use a UNJF go and a UNF no-go gages to check the threads, or do I need to have UNJF … The pitch P is the distance between thread … I'm making some parts with a .375-24 UNJF-3A threads. 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 … Characteristics shall include pitch diameter size, major diameter size, and minor diameter size. Thread Major Diameter Thread Per Inch Pitch Diameter Minor Diameter Male Thread Minor Diameter Female Thread; 13/16: … 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 Unified Thread Series 16 TPI ANSI/ASME B1.1, Unified Extra Fine Thread 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. 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. 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. 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. 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 … With these enlarged radii, minor diameters of external thread increase and intrude beyond the basic profile of the UN and UNR thread forms. 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: …
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