Tapping Saddle Sizes: Pipe Outside Diameter and Outlet Thread
A tapping saddle is considered when a branch connection is required from a main pipe. Ordering only a “32 mm saddle” or a “one-inch saddle” leaves an important question unanswered: is that the main-pipe size or the outlet thread? Identify both sides before selecting the part.
The pipe-side size follows the main pipe’s outside diameter
Match the saddle’s pipe-side designation to the main pipe outside diameter. Hose bore, pipe wall thickness and a colloquial inch description are not substitutes for this measurement. Use the pipe marking together with verified outside-diameter information.
A photograph alone cannot establish suitability where the pipe is distorted, damaged or unidentified. Confirm the pipe material and the intended use of the selected saddle model as well.
The second size describes the branch connection
The outlet’s nominal thread size, male or female form and thread standard must match the next fitting. A pipe dimension stated in millimetres and a nominal thread stated in inches do not measure the same feature.
A quotation can identify the connection as “main-pipe OD × outlet thread”. This is a way to record dimensions, not a promise that every combination is stocked or compatible with every valve and adaptor.
List the saddle, adaptor and valve separately
If the branch needs a valve, threaded adaptor or another downstream fitting, specify each size and quantity separately. Do not assume that an accessory visible in a photograph is included in the quoted item.
Model code, bolt arrangement, seal and number of outlets may also distinguish products. A rating from another fitting, or a general family name, must not be treated as proof of the complete assembly’s working limits.
Prepare a useful purchasing checklist
Provide main-pipe material and outside diameter, saddle model, outlet thread and gender, mating component, operating conditions, unit or pack quantity and destination. Include readable photographs of markings when available.
A saddle is a fitting: its selling unit and any pack contents are confirmed for that product. The full-coil rule for hoses and pipes does not turn a fitting into a coil-based item. Price, stock, included parts and delivery are confirmed in writing.
This guide explains purchasing dimensions, not drilling or working on a pressurised line. Determine installation requirements from the selected product instructions and a competent installer.
Related products and sizes
The cover is an illustrative product scene, not a real site record, installation instruction or product test.
Frequently Asked Questions
Do I choose a tapping saddle by pipe internal diameter?
The pipe-side size is matched to the main pipe outside diameter. The material and the selected model’s intended operating conditions also require confirmation.
Must the outlet thread equal the pipe diameter?
No. The main pipe and branch outlet serve different roles. Record both dimensions, the thread standard and the mating connection separately.
Are a valve and adaptor supplied with the saddle?
Check the product code and written quotation. Listing each required component and quantity separately helps prevent an incomplete delivery.
Confirm the size and supply scope
Share the product, size, full-coil or fitting quantity and destination. Stock and technical suitability are confirmed in the written quotation.
