H4 ° 60° ° Unified coarse threads Unit: mm 4.503 5.367 3 ／8 -24 UNF 7 ／16 -20 UNF 1 Basic profile, formula and basic dimensions of unified coarse threads / fine threads e.g. No.8 - 32 UNC Number of screw threads(n): Number of screw threads per inch (25.4mm) 7500-16 UNF-2B 1.0625-12 UNF-2B 1.0625-12 UNF-2B 1.6250-12 UNF-2B To hydraulic system Installation Dimensions Millimeters (Inches) Typical Applications CAUTION: Do not use this valve to check a high velocity reverse flow resulting in shock conditions. (See typical applications below.) Where such conditions exist, Vickers C2-8** or C5G-8** type ScrewThreads For 3/4-16 UNF 3A threads: 1) Pitch Diameter: ⌀.7056 – ⌀.7094 2) Size, form and pitch verification: Go/No Go Gages A For 5/8-11 UNC 2A threads: 3) Pitch Diameter: ⌀.5589 – ⌀.5644 4) Size, form and pitch verification: Go/No Go Gages A Overall appearance (clean, deburred, free of chips) A Points Earned 2- 8 8-UN : Basic Thread Dimensions (Pitch, minor & major diameters, depth, lead), Tolerance range for all applicable classes and much more. Internal Threads. 2B, 3B. 2 - 8 8-UN 2A (External) * Permisable values for thread Class 2A # Description Value (Inch) (UNC/UNF/UNEF) National Pipe (NPT) Dryseal Pipe (BPTF) British Pipe (BSP) ACME Metric60° Cone. DIN 7631. The male connector has a 60° recessed cone and a straight thread; the female has a straight thread as well, and a globeseal seat. The seal forms between the recessed cone on the male and the tapered nose of the female. The threads of both halves mesh to form a strong mechanical bond. 3 - 56 unf: 0.099: 2.515: 2.15: 56: 0.453 #4 - 48 unf: 0.112: 2.845: 2.40: 48: 0.529 #5 - 44 unf: 0.125: 3.175: 2.70: 44: 0.577 #6 - 40 unf: 0.138: 3.505: 2.95: 40: 0.635 #8 - 36 unf: 0.164: 4.166: 3.50: 36: 0.705 #10 - 32 unf: 0.190: 4.826: 4.10: 32: 0.794 #12 - 28 unf: 0.216: 5.486: 4.70: 28: 0.907: 1/4" - 28 unf: 0.250: 6.350: 5.50: 28: 0 Nominalthread 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 -32 UN 5/8-11 UNC to 7/8-32 UN: Nominal thread sizes from 5/8-11 UNC to 7/8-32 UN 15/16-12 UN to 1 3/16-28 UN: Nominal thread sizes from 15/16-12 UN to 1 3/16-28 UN 1 1/4-7 UNC to 1 9/16-20 UN: Nominal thread sizes 34 - 20 20-UN : Basic Thread Dimensions (Pitch, minor & major diameters, depth, lead), Tolerance range for all applicable classes and much more 0.16: Tap Drill Size (75% depth) 0.701: 17.81: 3/4 - 20 20-UN 2B (Internal) * Permisable values for thread Class 2B # Description Value (Inch) VValue (mm) D 1: Minor Diameter: 0.696 - 0.707: UNC- 60 Degree Unified Coarse Threads. UNC Thread Series / UNRC are the one most commonly used in the bulk production of bolts, screws, nuts and other general engineering applications. It is also used for threading into lower tensile strength materials such as cast iron, mild steel and softer materials (bronze, brass, aluminum, magnesium and plastics) Forexample, inch threads with a 3B fit have tighter tolerances than threads with a 2B fit. For technical drawings and 3-D models, click on a part number. Inch. Thread Size. Thread Type: Pitch Dia. Tolerance: Hardness: Material : Each: Class 2B. Class X. 0-80. UNF-0.0002" to 0.0002" Rockwell C70: Chrome-Plated Tool Steel: 3/4 "-16. UNF-0. CICNrC.