Service Metal
304 Stainless Steel MSS SP-43 Type A Butt Weld Stub End – Sch 40
- Availability:
- Allow 1-2 Days to Ship
- Weight:
- 0.00 LBS
Description
304 Stainless Steel MSS SP-43 Type A Butt Weld Stub End – Sch 40
304/L Stainless Steel Schedule 40S Butt Weld Stub Ends are manufactured from ASTM A/SA403 WP304/L stainless steel for corrosion resistance, weldability, and dependable performance in sanitary, chemical, food processing, commercial, and industrial piping systems.
Designed to MSS SP-43 Type A dimensions, these butt weld stub ends are intended for use with lap joint flanges and provide a practical connection option where alignment, inspection, maintenance, or future disassembly may be required.
Product Highlights
- ASTM A/SA403 WP304/L stainless steel construction
- Schedule 40S wall thickness
- Butt weld (BW) end connection
- MSS SP-43 Type A dimensions
- Designed for use with lap joint flanges
- Excellent corrosion resistance and weldability
- Precision-machined sealing face and hub
- Suitable for stainless steel piping systems
- Available in sizes from 1/2" through 6"
Technical Specifications
| Product Type | Butt Weld Stub End |
|---|---|
| Material | 304/L Stainless Steel |
| Material Specification | ASTM A/SA403 WP304/L |
| Pipe Schedule | Schedule 40S |
| Connection Type | Butt Weld (BW) |
| Stub End Type | MSS SP-43 Type A |
| Flange Compatibility | Designed for use with compatible lap joint flanges |
| Available Sizes | 1/2" through 6" |
| Applications | Sanitary, chemical, food processing, commercial, industrial, and process piping systems |
Construction Details
304/L Stainless Steel
Manufactured from dual-certified 304/L stainless steel for dependable corrosion resistance, mechanical performance, and excellent weldability.
Type A Stub End
The MSS SP-43 Type A configuration provides a machined lap and sealing face for use with compatible lap joint flanges.
Schedule 40S Fit-Up
Designed for butt weld installation with corresponding Schedule 40S stainless steel pipe for consistent alignment and permanent welded attachment.
Material & Stub End Design
Material Construction
- 304/L stainless steel
- ASTM A/SA403 WP304/L specification
- Excellent corrosion resistance
- Dependable weldability
- Durable construction for process piping service
Stub End Configuration
- MSS SP-43 Type A design
- Precision-machined sealing face
- Machined hub dimensions
- Butt weld pipe connection
- Designed for lap joint flange assemblies
- Schedule 40S wall thickness
Why Use a Stub End with a Lap Joint Flange?
A stub end is welded directly to the pipe while the lap joint flange remains free to rotate behind the stub end. This can make bolt-hole alignment easier during assembly and provides a practical flange arrangement for systems where inspection, maintenance, or future disassembly may be required.
Available Sizes
These Schedule 40S stainless steel Type A butt weld stub ends are available in nominal pipe sizes from 1/2" through 6". Select the stub end size that matches the nominal diameter of the Schedule 40S stainless steel pipe and compatible lap joint flange being installed.
Typical Applications
Sanitary & Process
- Sanitary piping systems
- Food processing systems
- Chemical processing piping
- Process piping systems
Commercial & Industrial
- Commercial piping systems
- Industrial piping systems
- Stainless steel piping assemblies
- Lap joint flange connections
Pipe Size Reference
Need help confirming nominal pipe diameter or Schedule 40S wall thickness before ordering? Use our common pipe diameter and wall thickness reference chart to verify the correct pipe size for your installation.
Product Documents
Service Metal Schedule 40S Stub End Spec Sheet
Review the product specification sheet for dimensions and additional manufacturer information for Schedule 40S stainless steel butt weld stub ends.
Certificate of Conformance
Review the available Certificate of Conformance documentation for applicable product and material information.
Need Help Selecting the Correct Stub End?
Our industrial PVF specialists can help confirm your required pipe size, Schedule 40S wall thickness, material, stub end type, and compatible lap joint flange before you order.
Frequently Asked Questions
What is a butt weld stub end used for?
A butt weld stub end is welded to the end of a pipe and used with a lap joint flange to create a flanged piping connection.
What material are these stub ends made from?
These stub ends are manufactured from ASTM A/SA403 WP304/L stainless steel.
What pipe schedule are these stub ends designed for?
These fittings are designed for Schedule 40S stainless steel piping systems.
What standard do these stub ends follow?
These stub ends are manufactured to MSS SP-43 Type A dimensional requirements.
Why is a lap joint flange used with a stub end?
The stub end provides the sealing surface while the lap joint flange remains free to rotate behind it, which can simplify bolt-hole alignment during assembly.
Is the lap joint flange included?
No. The stub end is intended for use with a compatible lap joint flange, which is sold separately.
What sizes are available?
These Schedule 40S Type A butt weld stub ends are available in nominal pipe sizes from 1/2" through 6".
How do I select the correct stub end?
Select the nominal stub end size that matches the Schedule 40S stainless steel pipe and verify compatibility with the lap joint flange being used in the assembly.
Important Ordering & Installation Notes
- Select the nominal stub end size that matches the Schedule 40S stainless steel pipe being installed.
- Available nominal sizes range from 1/2" through 6".
- Material: ASTM A/SA403 WP304/L stainless steel.
- Pipe schedule: Schedule 40S.
- Configuration: MSS SP-43 Type A butt weld stub end.
- Connection: Butt weld (BW).
- Designed for use with compatible lap joint flanges.
- Lap joint flange is sold separately.
- Verify pipe schedule, flange compatibility, nominal size, and system requirements before installation.
- Installation should be performed using accepted stainless steel welding procedures.
