Smith-Blair · Steel Transition Coupling
Style 413 Steel Transition Coupling
Expanded Sleeve, Steel to Ductile Iron OD — 14-48 in, Low-Alloy Bolts
150 PSI Max Working Pressure
-20°F to +180°F Temperature
Nitrile (Buna-N) Gasket
Epoxy-Coated Steel Expanded Sleeve
Low-Alloy Steel Bolts
NSF/ANSI 61 and 372
AWWA C219
14.00-50.80 in Pipe OD
115-350 lb Weight
Description
The Smith-Blair Style 413 expanded-sleeve transition coupling joins plain-end pipe of the same nominal size but different ODs, from 14 to 48 in: the large end fits the ductile or cast iron pipe OD (15.30 in at 14 in nominal, up to 50.80 in at 48 in) and the small end the steel pipe OD (14.00 to 48.00 in). A 3/8 x 12 in fabricated steel sleeve, expanded at one end, carries steel followers and Nitrile gaskets, with anchor loops welded to the sleeve so each follower end is secured on its own, and low-alloy steel bolts and nuts.
Choose the nominal size and large-end OD in the first option and the small-end OD in the second; order by the exact ODs of both pipes.
Application: joining steel pipe to ductile or cast iron pipe of the same nominal size, 14 to 48 in.
Key Features
- Working pressure up to 150 PSI
- Expanded sleeve takes the full steel-to-iron OD step at each size
- Allows limited expansion and contraction and dampens vibration to reduce pipe fatigue
- No special pipe-end preparation; deflects to change pipe direction without elbows or bends
- Meets applicable AWWA C219; certified to NSF/ANSI 61 and NSF/ANSI 372
What Ships and What It Needs to Run
Included: the expanded steel sleeve with anchor loops, steel followers, Nitrile gaskets and the bolts and nuts, ready to install.
Pipe stiffeners on HDPE, ordered separately. Smith-Blair requires pipe stiffeners when the coupling is used on polyethylene pipe; ask us to quote them with the coupling.
Genuine Smith-Blair equipment, factory-new in original packaging — sold and supported by Watermain Supply, an independent industrial supplier.
12-Month Smith-Blair Warranty
Smith-Blair warrants its products to be free of defects in materials and workmanship for one year from the date of shipment by Smith-Blair. Dated proof of purchase, such as a bill of sale, is required to establish eligibility. Smith-Blair will repair or, at its option, replace a defective product; the product is returned to the factory or warehouse Smith-Blair designates.
Working Pressure
Up to 150 PSI, the standard design rating. Smith-Blair notes that a coupling's working pressure depends on pipe type and diameter, sleeve thickness and material, gasket cross section, follower type and number of bolts; higher-pressure designs are built to order.
Materials Specifications
| Sleeve |
Carbon steel, ASTM A283C, 3/8 x 12 in, expanded; larger sleeves carry hanging rings |
| Anchor loops |
Carbon steel, ASTM A36, welded to the sleeve to secure each follower end independently |
| Followers |
Carbon steel C1020 (ASTM A576), integral bolt-head pocket for one-wrench installation |
| Bolts |
High-strength low-alloy steel (AWWA C111/A21.11), 5/8-11 UNC track-head oval neck, rolled threads |
| Nuts |
High-strength low-alloy steel (AWWA C111/A21.11), heavy hex semi-finished |
| Gasket |
Nitrile (Buna-N) per ASTM D2000, NSF 61, with molded-in sealing ribs for textured ductile iron and AC pipe; resists water, oil, acids, alkalies and most (aliphatic) hydrocarbons; -20°F to +180°F |
| Finish |
Flexi-Coat fusion-bonded epoxy (meets AWWA C213) |
Materials subject to change by the manufacturer.
Pipe Applications
Steel pipe at one end and ductile or cast iron pipe at the other; the 413 also serves stainless steel, asbestos cement and PVC pipe of matching OD. HDPE requires pipe stiffeners.
Sizes
| Nominal size - End 1 OD |
End 2 OD |
| 14 in - 15.30 in OD |
14.00 in |
| 16 in - 17.40 in OD |
16.00 in |
| 18 in - 19.50 in OD |
18.00 in |
| 20 in - 21.60 in OD |
20.00 in |
| 24 in - 25.80 in OD |
24.00 in |
| 30 in - 32.00 in OD |
30.00 in |
| 36 in - 38.30 in OD |
36.00 in |
| 42 in - 44.50 in OD |
42.00 in |
| 48 in - 50.80 in OD |
48.00 in |
Choose the size in the first option; the part number shows in the last option.
Bolt Numbers and Deflection
| Nominal size |
Bolts (5/8 in) |
Max deflection |
| 14, 16, 18 in |
8, 15 in long |
4-1/2° |
| 20 in |
10, 15 in long |
4-1/2° |
| 24 in |
12, 15 in long |
4-1/2° |
| 30 in |
14, 15 in long |
4° |
| 36 in |
16 per end, 4-1/2 in long |
4° |
| 42 in |
18 per end, 4-1/2 in long |
3-1/2° |
| 48 in |
20 per end, 4-1/2 in long |
3° |
Bolts from the Style 413 datasheet expanded-sleeve table; deflection from the Model 413 spec for a 10 in and longer center sleeve. Sleeve 3/8 x 12 in on every size.
Installation Notes
- Pipe stiffeners are required when the coupling is used on polyethylene (HDPE) pipe.
- Clean the pipe ends, then slide a follower onto each pipe, followed by a gasket with its beveled edge facing the pipe end; lubricate the pipe and gaskets with a soap-and-water solution that meets the water and pipe supplier's requirements.
- Center the pipe gap in the sleeve: with the 12 in sleeve aim for 1 in on a straight run and no more than 6 in (sleeve length less 6 in).
- Hand-tighten the nuts, then tighten gradually, alternating between opposite sides so the followers stay parallel, to the torque in the instructions; recheck torque after the line is pressurized.
- Allowable axial pipe movement per coupling is 1/8 in through 2 in nominal, 1/4 in over 2 to 10 in, and 3/8 in above 10 in.
- Anchor the pipe: the coupling seals around it, and Smith-Blair requires proper anchoring to restrain pipe movement and prevent pull-out.
From Smith-Blair Installation Instructions TI-017 (Rev 08/26/21), in the Data Sheet tab.
Before You OrderAll Smith-Blair products are Made to Order and Non-Returnable.
Items typically shipped in 5 - 10 business days.
Other transitions (most up to a 10% change in diameter), longer sleeves, pipe stops, anchor studs, stainless hardware and other gaskets are built to order — email sales@watermainsupply.com with both pipe ODs and materials.
