
GO Galvanised Malleable Iron Back Nut Range Scr BSP BS EN 10242
SKU: LBN08
$0.99
GO Galvanised Malleable Iron Back Nut Range Scr BSP BS EN 10242
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DIMENSIONS |
A Back Nut is a threaded nut, one side of which is dished to retain a grommet; used in forming a watertight pipe joint. A locking nut on the shank of a pipe fitting, tap, or valve.
MATERIALS
- Blackheart Malleable Iron casting.
DIMENSIONS
- generally to ASME B16.3 or JIS B2301, depending on manufacturing source.
- JIS B2301 dimensions are generally considered to be corresponding values to BS143 and BS1256, although some sizes are not exact equivalents.
THREADING
- BSP pipe thread, to BS.21 (AS 1722, Part 1).
- The specification for BS 143 fittings is:
- Taper External (Series R) Taper Internal (Series RC)
- The specification for BS 1256 fittings is:
- Taper External (Series R) Parallel Internal (Series RP)
FINISH
- Hot Dip Galvanised is the standard finish for stock.
TESTING
- Fittings shall be subject to an internal hydraulic pressure of 2068 kPa without showing any sign of leakage or abnormality.
WORKING PRESSURES (except flanges)
- Recommended maximum working pressures are 1379 kPa for water and 1034 kPa for steam, air, gas and oil. NOTE: Working pressures may also be limited by relevant Pressure Piping Codes or Industry regulations.
UNEQUAL SIZES
- When ordering Reducing Sockets, Nipples, Bushes and Elbows, always state largest size first — e.g. 80 x 40 bush. When ordering 3- or 4- way fittings, the sizing sequence illustrated below should be adopted.