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2. Injector pen - Wikipedia

   en.wikipedia.org/wiki/Injector_pen

   [2] [7] Today, pen needles are manufactured at shorter needle lengths than required for typical vial and syringe administration, which decreases the pain associated with injection. [2] They are available in multiple lengths and gauge of needle, including 3.5mm, 4mm, 5mm, and 8mm lengths, and 31 through 34 gauge. [8]

3. List of thread standards - Wikipedia

   en.wikipedia.org/wiki/List_of_thread_standards

   V Thread Form: 0.60 UNM ANSI/ASME B1.11-1958 (R2016) Microscope Objective Thread: V Thread Form ASME B1.13M-2005 (R2015) Metric Screw Threads: M Profile: V Thread Form ASME B1.15-1995 (R2003) Unified Inch Screw Threads (UNJ Thread Form) V Thread Form ASME B1.20.1-2013: Pipe Threads, General Purpose (Inch) Pipe Thread Form ANSI B1.20.3-1976 ...

4. United States Standard thread - Wikipedia

   en.wikipedia.org/wiki/United_States_Standard_thread

   The thread form is defined by flats at the tip and root of the thread form. This flat length is defined as the pitch divided by eight. The thread depth, which is from flat to flat is 0.6495 times the pitch. [4] For 1 ⁄ 4-inch (6.4 mm) screws and larger, the pitch is defined as: = +

5. Syringe - Wikipedia

   en.wikipedia.org/wiki/Syringe

   The threads of the Luer lock tip of this 12mL disposable syringe keep it securely ... and specialty needles. [2] ... BD Ultra Fine [13] [18] (standard length only) ...

6. Birmingham gauge - Wikipedia

   en.wikipedia.org/wiki/Birmingham_gauge

   The Birmingham gauge ranges from 5/0 or 00000, the lowest gauge number corresponding to the largest size of 0.500 inches (12.7 mm), to 36, the highest gauge number corresponding to the smallest size of 0.004 inches (0.10 mm).

7. Unified Thread Standard - Wikipedia

   en.wikipedia.org/wiki/Unified_Thread_Standard

   Class 1 threads are loose fit, intended for ease of assembly or use in a dirty environment. Class 2 threads are free fit, and the most common. They are designed to maximize strength considering typical machine shop capability and machine practice. Class 3 threads are medium fit, still quite common and used for closer tolerances on high quality ...