SAESTRAIGHT THREAD PORT DIMENSIONS. SAE information is provided as an aid to designers. For complete specifications refer to SAE Standards J1926-1 for straight thread ports and J518 Parts 1 and 2 for 4-bolt flange ports. CAVITY. SIZE CODE. 1External Thread Dimensions for unified UNF Screw Threads Diameter Threads Thread Major Diameter Pitch Diameter Minor Diameter Stress Per Fit Class ( ) ( ) ( ) Area Inch Max Min Max Min Max in . (TPI). No 0 80 2A No 1 72 2A No 2 64 2A No 3 56 2A No 4 48 2A No 5 44 2A No 6 40 2A No 8 36 2A No 10 32 2A No 12 28 2A 1/4 28 2A 5/16 24 2A 3/8 24 2A StandardASME B1.2-1983 ASMEB1.3-2007. RH=right hand LH=left hand both available (Just RH gage in stock, LH need custom production) 3″-4 UNC screw plug gage : taperlock double end with handle. 3″-4 UNC screw ring gage : solid. Each gage 100% calibrated with quality assurance. 8UN- 60 Degree Unified Threads. The 8-thread series (8-UN) is a uniform-pitch series for large diame- ters. Although originally intended for high-pressure-joint bolts and nuts, it is now widely used as a substitute for the Coarse-Thread Series for diameters larger than 1 inch. 1 1/16" - 1 11/16" 1 3/4" - 2 5/8" 2 3/4" - 3 3/4" 3 7/8" - 4". Impérial Métrique: Nominal Size, TPI, Series Class Max Major Max Minor Min Major Min Minor Max Pitch Min Pitch Ø ext. Ø flanc Pas; Ext. 0-80 UNF : 2A : 0.0595 Atable of UNC and UNF thread sizes up to 1 inch in diameter. 3/8-16 UNC 2B DOUBLE (21) Future threads. It might be thought that after 150 years so seemingly simple a thing as the bolt could have been brought to perfection, but that is not the case. All the thread forms discussed so far share one characteristic: they are symmetrical. Nominalthread sizes from 0-80 UNF to ¼-56 UNS Nominal thread sizes from 2 7/8-6 UN to 4-16 UN External Thread / Internal Thread : Nominal Size, TPI, Series: Class: Allowance: 2B : 1.5150: 1.4900 : 1.5535: 1.5438: 1.6250: Ext. 1 5 / 8-8 UN: 3A: 0.0000: 1.6250: : 1.5382: 1.4806: Purchase9/16-18UNF-2B-V-DC-MT-DIN2184-1 HSS Tap DIN Zero Tap Series V-DC-MT, UNF DIN 2184-1 from OSG, FA & metal molding parts, industrial tools and consumables. NOTE : Windows 7 users won’t be able to use some latest features of eCatalog/WOS since Microsoft is ending support for Windows 7 on 14 Jan, 2020. Class2BInternal ThreadsNuts. Min. Major Diameter Minor Diameter Pitch Line Axis of internal thread. INTERNALTHREADS-CLASS2BASME B1.1 Nominal Size & Threads per Inch Series Designation Allowance Minor Diameter Pitch Diameter Major Diameter Min Max Min Max Tolerance Min 0-80 UNF 0.0005 0.0465 0.0514 0.0519 0.0542 0.0023 0.0600 1 threadseries designation: (UN, UNC, UNF, UNEF, UNS) The thread series is generally relative to the outside diameter of the screw. 20 threads per inch on a 1/4" diameter screw is considered coarse: 1/4 HmJdOTG.