Dixon 08/048/20/000 2" (50 mm) Shouldered Bolted Coupling - Iron

This Dixon bolted shouldered coupling joins shouldered end pipe, the system used in mining and construction pipelines. The housing is SG iron to AS 1831 400-250-12 with a nitrile (Buna) gasket and zinc plated finish, and it is clamped on the shoulders by bolts (manufacturer-stated).

The store lists ten sizes, from 50 NB (2") to 600 NB (24"). Housing segments per coupling rise from two to four on the larger sizes, and the nuts and bolts are metric grade 8.8 up to 300 NB and grade 4.6 from 350 NB. Dixon says the working pressure is as tested to AWWA C606 requirements, with a safety factor of 3:1 (manufacturer-stated).

Where this product is used

• Joining shouldered end pipe in mining and construction (manufacturer-stated).
• Water pipelines built from shouldered end pipe in mining and construction (manufacturer-stated).

Features

• Housing: SG iron to AS 1831 400-250-12; finish zinc plated (manufacturer-stated)
• Gasket: nitrile Buna (manufacturer-stated)
• Nuts and bolts: metric grade 8.8 for 50 to 300 NB, grade 4.6 for 350 to 600 NB (manufacturer-stated)
• Housing segments per coupling: 2 (50 to 300 NB), 3 (350 and 400 NB), 4 (450 and 600 NB) (manufacturer-stated)
• Working pressure as tested to AWWA C606 requirements, safety factor 3:1 (manufacturer-stated)

Common specifications

Key specifications

Working pressure is shown only where Dixon's documents agree. Dixon's catalogue, brochure and mining catalogue print different ratings for the 50 to 200 NB sizes, and no agreed figure for the sizes from 350 NB, so confirm the rating with us before you order those sizes. Dixon prints the 250 NB pipe OD as 273.9 mm in the coupling table and 273.1 mm for the matching split ring. The 80 NB and 150 NB couplings (08/048/20/002 and 08/048/20/005) are marked Minsup branded in Dixon's catalogue (manufacturer-stated).

Selecting the right option

Match the coupling to the shoulder ring or shouldered pipe end, not to the nominal pipe size alone, and fit a gasket that suits the fluid: the standard gasket is nitrile Buna, and replacement shouldered coupling seals are listed in Related products. Dixon's catalogue notes that couplings are not recommended for use with air (manufacturer-stated), so confirm the service with us if your line carries compressed air.

Related products

Related Dixon shouldered products: Dixon Seal For Shouldered Coupling Buna-N, Dixon Shouldered Weld Ring - Mild Steel, Dixon Shouldered Weld Ring Split Type - Mild Steel, Dixon Minsup Quick Release Shouldered Coupling - SG Iron and Dixon Shouldered Equal Tee Galvanised Mild Steel.