The following formula for the Tensile Stress Area of the (male) screw . D = Basic Diameter. 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 This table is based on a percentage of thread depth that is around 60 to 80%. p = Screw Thread Pitch L e = Length of Thread Engagement A t = The screw thread tensile stress area d p = Pitch circle diameter of thread A ss =The thread shear area. D = Basic major diameter, example; .500 for a 1/2 - 13 UNC - 2B Thread Engineering Data Chart Use of Unified Tooling. and a Unified 1/4-28 UNJF internal thread? Thread Mills Tool Holders Hollfelder; Product Lines. Custom Tooling RFQ Forms. Two (2) inputs are required, See the application illustration at bottom of page. UNJ product threads are identified by the letter “J” in the thread symbol, and a thread class symbol including an “A” for external threads or a “B” for internal threads. Thread percentage: (77% thread is what you want to use) A 100% thread is 3/4 qtr, or (6/8 th), of the full 60° triangle which is the maximum allowed height of a full thread, the "V" shape, including flats. There are other Unified UNJ threads such as UNJC coarse pitch threads and UNJEF ultra fine pitch threads. Gun Drill EB80; Gun Drill EB100; Gun Drill EB800; Gun Drill ZB80; End Mill; Tap; Reamer; Stepped Reamer So they are very popular for reinforcing or repairing threaded joints. • Calculation of threads with nominal sizes from 0.25 mm up to 1250 mm (0.1 - 50 in.) Nominal Thread Size: Covered Range: 0-80 UNF to ¼-56 UNS: Nominal thread sizes from 0-80 UNF to ¼-56 UNS 5/16-18 UNC to 9/16 -32 UN: Nominal thread sizes from 5/16-18 UNC to 9/16 … Included in this calulation is the probable oversize (for each thread size) in accordance with FED-STD-H28/2. The UN specification specifies that the common height of a thread should be 5/8 th of this maximum height. Please input the threading information. The most important features offer: • Compliance with the latest revisions of ISO, EN, DIN, ANSI, ASME, BS, JIS, IS, SAE, API and other corresponding national standards. Drill; Quick-Delivery for Special Drills; HT 800 WP; Grooving; Gun Drills. This calculator will calculate the unknown for the given conditions. This is based on ISO 898 Part 1. see calculation below... d p = Pitch circle diameter of thread The thread accuracy is referred to as a 3B class of fit or a 2B class of fit. Many of the UNJ thread form characteristics are the same as for a UN threads. Screw Thread Designation. F = Fine thread … Stress Area formulae . Note: In order to comply with AS8879 and FED-STD-H28/2 the selected drill sizes must fall within the min/max ranges listed for each thread form (UNJ and UN). Internal threads: the minor diameter is increased to accomodate the maximum root radius of the external thread. The 1/4"-28 UNJF is a Unified fine pitch UNJ inch thread for aerospace. Calculation of Thread Lead Angle. α：Lead angle I：Lead n：Number of threads P：Pitch d：Effective diameter of thread. The following are definitions for the elements: A t = tensile strength area of screw thread. EXAMPLE: .3125 - 24 UNJF - 3A (B).3125 = Nominal Diameter = Maximum Major Diameter 24 = Number of threads per inch UN = Unified National (60° – V-thread) J = Controlled root radius — High Strength (Minor diameter increased from UN to UNJ.) UNJ screw threads are of the same form as Unified Screw Threads to ASME/ANSI B1.1 except: External threads: the root has a maximum and minimum prescribed continuous radius, and is not merely rounded due to tool wear. Calculating thread, tolerances, fits, thread and plain and gauges . The use of thread inserts produces heavy-duty and very wear-resistant threads even in materials with lower strength.
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