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Pipe & Pneumatic Fittings · ISO 228 (G) · Application guide

BSP Pipe Thread Fittings — Applications & Typical Uses

BSP Pipe Thread Fittings are used primarily for joining and sealing fluid or pneumatic lines. This page summarizes where they fit, the industries that rely on them, and the practical points to get right when you specify them — to ISO 228 (G). Stocked across roughly M1 to M312, they cover general to heavy-duty work.

Typical Applications for BSP Pipe Thread Fittings

The most common settings where these are specified:

  • Pneumatic systems: connecting air lines, cylinders and valves on automation rigs.
  • Hydraulic & fluid power: sealed, pressure-rated joints in fluid lines.
  • Process & plant piping: tapped connections on manifolds and equipment.
  • General machine building: fastening covers, brackets, motors and sub-assemblies on production equipment.
  • Maintenance & repair (MRO): a stocked size for servicing existing plant where the original fastener spec must be matched.

How to Specify BSP Pipe Thread Fittings for Your Application

  • Size: Match the nominal size to the mating thread or hole. This product spans M1–M312; check the full table below for the exact dimensions of each size.
  • Thread & pressure: Match the thread form (BSP/NPT/metric) and pressure rating to the line, and seal appropriately (tape, sealant or O-ring).
  • Environment: For damp, coastal or chemical exposure prefer A4/316 stainless or a suitable coating; indoors, plated steel or A2 is usually sufficient.
  • Standard: This product is supplied to ISO 228 (G). Quoting the standard on your order guarantees interchangeable dimensions between suppliers.

Where BSP Pipe Thread Fittings Are Not the Right Choice

Do not mix thread forms (BSP into NPT) without an adapter, and do not exceed the pressure rating of the lowest-rated component.

Technical Drawing

Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the size will snap the other fields to that size's standard values; you can then override any individual value.

Sends the selected values to the quote form below.

Request a Quote

Set the size and options in the drawing above, then send the exact configuration straight to this form.

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Specification
Business Information

Dimensions & Specifications (ISO 228 (G))

SizeNominal size (in)Major diameter (mm)Pitch (mm)Threads per inch (TPI)Tap drill (mm)Reference standardNotes
G1/161/167.7230.907286.8ISO 228-1 / DIN ISO 228Parallel pipe thread (G), sealed by gasket
G1/81/89.7280.907288.8ISO 228-1 / DIN ISO 228Parallel pipe thread (G), sealed by gasket
G1/41/413.1571.3371911.5ISO 228-1 / DIN ISO 228Parallel pipe thread (G), sealed by gasket
G3/83/816.6621.3371915.0ISO 228-1 / DIN ISO 228Parallel pipe thread (G), sealed by gasket
G1/21/220.9551.8141418.5ISO 228-1 / DIN ISO 228Parallel pipe thread (G), sealed by gasket
G5/85/822.9111.8141420.5ISO 228-1 / DIN ISO 228Parallel pipe thread (G), sealed by gasket
G3/43/426.4411.8141424.0ISO 228-1 / DIN ISO 228Parallel pipe thread (G), sealed by gasket
G7/87/830.2011.8141427.5ISO 228-1 / DIN ISO 228Parallel pipe thread (G), sealed by gasket
G1133.2492.3091130.5ISO 228-1 / DIN ISO 228Parallel pipe thread (G), sealed by gasket
G1-1/81-1/837.8972.3091135.0ISO 228-1 / DIN ISO 228Parallel pipe thread (G), sealed by gasket
G1-1/41-1/441.912.3091139.0ISO 228-1 / DIN ISO 228Parallel pipe thread (G), sealed by gasket
G1-1/21-1/247.8032.3091145.0ISO 228-1 / DIN ISO 228Parallel pipe thread (G), sealed by gasket
G1-3/41-3/453.7462.3091151.0ISO 228-1 / DIN ISO 228Parallel pipe thread (G), sealed by gasket
G2259.6142.3091157.0ISO 228-1 / DIN ISO 228Parallel pipe thread (G), sealed by gasket
G2-1/42-1/465.712.3091163.0ISO 228-1 / DIN ISO 228Parallel pipe thread (G), sealed by gasket
G2-1/22-1/275.1842.3091172.0ISO 228-1 / DIN ISO 228Parallel pipe thread (G), sealed by gasket
G2-3/42-3/481.5342.3091179.0ISO 228-1 / DIN ISO 228Parallel pipe thread (G), sealed by gasket
G3387.8842.3091185.0ISO 228-1 / DIN ISO 228Parallel pipe thread (G), sealed by gasket
G3-1/23-1/2100.332.3091197.5ISO 228-1 / DIN ISO 228Parallel pipe thread (G), sealed by gasket
G44113.032.30911110.0ISO 228-1 / DIN ISO 228Parallel pipe thread (G), sealed by gasket
G55138.432.30911135.0ISO 228-1 / DIN ISO 228Parallel pipe thread (G), sealed by gasket
G66163.832.30911160.0ISO 228-1 / DIN ISO 228Parallel pipe thread (G), sealed by gasket

Frequently Asked Questions

Can I mix BSP and NPT BSP Pipe Thread Fittings?

Not directly — the thread forms differ in angle and taper. Use a dedicated BSP-to-NPT adapter, and seal with the method suited to the thread (tape, sealant or O-ring).

What material should BSP Pipe Thread Fittings be for outdoor use?

For damp, coastal or chemical environments specify A4 (316) stainless or a suitably coated steel. For indoor or dry use, A2 (304) stainless or zinc-plated steel is normally adequate.

Are BSP Pipe Thread Fittings made to a recognized standard?

Yes — they are manufactured to ISO 228 (G), so dimensions are interchangeable between suppliers when you quote the standard on your order.

What are BSP Pipe Thread Fittings used for?

Joining and sealing fluid or pneumatic lines. They are supplied to ISO 228 (G).

Can I get a quote for BSP Pipe Thread Fittings in the size and material I need?

Yes. Use the technical drawing and quote form on this page to set the size and options, then send the exact configuration to our team for pricing and lead time.