ASTM A403 MSS SP-97 Stainless Steel Weldolet Fittings 1/8" to 36" Size Range with STD Sch40 Sch160 XS XXS Wall Thickness
Weldolet fittings are the most common type of branch connection within the butt welding fittings family, designed to create secure 45° or 90° branch connections from main pipelines to smaller lines. These fittings minimize stress concentrations and provide integral reinforcement for enhanced piping system integrity.
- Available in size-on-size and reducing configurations
- Manufactured to ASTM A403 and MSS SP-97 standards
- Available in multiple stainless steel grades including WP304/L, WP316/L, WP310S, and WP321
- Size range from 1/8" to 36" with various wall thickness options
- Beveled ends for secure welding to both run and branch pipes
- Provides permanent, leak-proof connections with minimal stress concentration
- Alternative to more complex fittings like elbows or tees
| Product Name | ASTM A403 MSS SP-97 Weldolet |
|---|---|
| Size Range | 1/8" to 36" |
| Wall Thickness | STD, Sch40, Sch160, XS, XXS |
| Standards | ASTM A403 |
| Grade | WP304/L, WP316/L, WP310S, WP321 |
| Manufacturing Standards | ASME B16.11 Weldolets, MSS SP-97 |
Center of Run to Face measurements for various pipe sizes and schedules:
ASTM A403 Stainless Steel Pipe Fittings are forged and rolled austenitic stainless fittings designed for pressure piping applications. Common grades include WP304/L and WP316/L, suitable for engineering industries and energy conversion plants.
| Grade WP | UNS Designation | C | Mn | P | S | Si | Ni | Cr | Mo | Ti |
|---|---|---|---|---|---|---|---|---|---|---|
| WP304 | S30400 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 8.0-11.0 | 18.0-22.0 | ﹍ | ﹍ |
| WP304L | S30403 | 0.030E | 2.00 | 0.045 | 0.030 | 1.00 | 8.0-12.0 | 18.0-22.0 | ﹍ | ﹍ |
| WP310S | S31008 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 19.0-22.0 | 24.0-26.0 | ﹍ | ﹍ |
| WP316 | S31600 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 10.0-14.0 | 16.0-18.0 | 2.00-3.00 | ﹍ |
| WP316L | S31603 | 0.030E | 2.00 | 0.045 | 0.030 | 1.00 | 10.0-14.0 | 16.0-18.0 | 2.00-3.00 | ﹍ |
| WP321 | S32100 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 9.0-12.0 | 17.0-19.0 | ﹍ | G |
Note: Ellipsis (﹍) indicates no requirement for analysis or reporting. Nitrogen analysis method requires agreement between purchaser and manufacturer. Columbium 0.10-0.30%; Vanadium 0.10-0.30%. For small diameter or thin walls requiring multiple drawing passes, carbon maximum of 0.04% applies to grades TP304L and TP316L.
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