Internal British Pipe ISO Threads (Whitworth Form) Table per. BS EN ISO 228

ISO Metric Hardware Engineering Data
Fastener and Screw / Bolt Design, Formula and Calculations

Internal Pipe Threads per. ISO 228-1, Pipe threads where pressure-tight joints are not made by the threads. These pipe threads are also known as Whitworth pipe threads.

Where:

D = Major Dia.internal thread
D₁ = Minor Dia.internal thread
D₂ = Pitch diameter internal thread
d = Major Dia.external thread
d₁ = Minor Dia.external thread
d₂ = Pitch diameter external thread
T_D1 = Tolerance internal thread minor diameter
T_D2 = Tolerance on the pitch diameter of the internal thread
T_d = Tolerance on the major diameter of the external thread
T_D2 = Tolerance on the pitch diameter of the external thread
P = Pitch
H = Height of the fundamental triangle of the thread
h = Height of the thread profile with rounded crests and roots

Related:

• ANSI Inch Unit Hardware Design Guide
• Length of Screw Thread Engagement per. ISO 965-1 Calculator, Formula and Table Length of engagement of mating threads is selected to utilize full tensile strength of a bolt prior to shearing and nut threads.
• External ISO Metric Trapezoidal Screw Threads Chart TR320 - TR1120
• Whitworth British Standard Pipe (BSP) Thread Tap Drill Size Table DIN ISO 228
• External British ISO Pipe Threads (Whitworth Form) Table per. BS EN ISO 228
• Straight Pipe Thread ANSI
• National Standard Taper Pipe Threads Size NPT Chart
• Pipe Thread Tap and Drill Size Chart ANSI NPT

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