Schedule 40 or 80? Start with the pipe system and connection, not the fitting color.
Use ASTM D2466 when the requirement is a PVC Schedule 40 fitting and ASTM D2467 when the requirement is a PVC Schedule 80 fitting. When the fitting itself is threaded Schedule 80 PVC, check ASTM D2464 as the threaded-fitting specification. These standards control the fitting product; they do not prove that a complete pipe, fitting, valve, solvent-cement, or threaded assembly is suitable for the job. Before approving the BOM, confirm the pipe standard, nominal size and actual outside-diameter system, Schedule, socket or thread connection, working and peak pressure, normal and maximum temperature, fluid and concentration, valve end standard, and any required project documents. Do not order from "2 inch PVC" alone. ASTM IPS, DIN metric, and different thread systems can carry similar nominal labels without being interchangeable.
Quick Selection: D2466, D2467, or D2464?
| Requirement on the BOM | ASTM direction | Check before approval |
|---|---|---|
| PVC Schedule 40 fitting | ASTM D2466 | IPS pipe OD, fitting geometry, joint method, actual pressure-temperature condition, and fluid compatibility. |
| PVC Schedule 80 fitting | ASTM D2467 | Same checks as above. Do not treat Schedule 80 as automatic approval for every higher-pressure or chemical line. |
| Threaded PVC Schedule 80 fitting | ASTM D2464 | Thread form, male/female material, tightening method, pressure-temperature requirement, and connected valve or equipment port. |
| CPVC fitting | Do not specify D2466, D2467, or D2464 as the CPVC fitting standard. | Use the applicable CPVC product specification and confirm the exact fitting type and project requirement. |
Schedule identifies a product dimension series. It is not one fixed operating-pressure value. The exact fitting, size, temperature, fluid, joint, and connected components still control the usable system envelope.
What Each ASTM Standard Actually Covers
ASTM D2466-24
Covers PVC Schedule 40 pipe fittings, including requirements for materials, workmanship, dimensions, and burst pressure. The ASTM scope identifies use with IPS outside-diameter plastic pipe and pressurized liquids that are chemically compatible with the piping material.
ASTM D2467-24
Covers PVC Schedule 80 pipe fittings, with requirements for materials, workmanship, dimensions, and burst pressure. The intended service is pressurized liquid that is chemically compatible with the piping material.
ASTM D2464-23
Covers threaded PVC Schedule 80 pipe fittings. It also includes material, workmanship, dimensional, and burst-pressure requirements for the threaded fitting product.
The three standards above are PVC standards. ASTM directs CPVC Schedule 40 socket fittings to F438, CPVC Schedule 80 fittings to F439, and threaded CPVC Schedule 80 fittings to F437.
Official references: ASTM D2466-24, ASTM D2467-24, and ASTM D2464-23.
Keep the evidence categories separate
A product standard, product conformity statement, test method, test result, and third-party certificate are different pieces of evidence. A reference to ASTM D2466 or D2467 does not by itself prove the pressure rating of every size, chemical compatibility, completed-joint performance, valve compatibility, or third-party certification of the supplied item.
Matching D2466 or D2467 Fittings to ASTM D1785 Pipe
When ASTM D1785 pipe is already specified, start with the pipe outside-diameter system. For a given IPS nominal size, Schedule 40 and Schedule 80 pipe share the IPS outside-diameter basis while their wall thickness and bore differ. The fitting socket still has to match that outside diameter and the applicable fitting geometry.
That is why a line item such as "2 inch PVC elbow" is incomplete. It does not tell you whether the project is ASTM/IPS or DIN metric, whether the fitting is Schedule 40 or Schedule 80, or whether the end is socket or threaded.
Use the PVC and plastic pipe range to confirm the actual pipe system before the fitting list is frozen.
A useful drawing check
Look for the pipe OD or dimensional standard on the drawing. If it only says 2", DN50, or another nominal label, stop the fitting release until the actual standard is known. Similar nominal names do not establish interchangeability.
What Changes When You Move From Schedule 40 to Schedule 80?
A heavier Schedule changes wall geometry. On the pipe side, the same IPS outside-diameter basis with a thicker wall means less internal flow area. Fitting geometry also changes between the Schedule 40 and Schedule 80 product standards.
That matters in compact filtration skids, dosing modules, and pump rooms. Replacing Schedule 40 with Schedule 80 without checking the bore can change velocity and pressure loss. It can also change fitting envelope, clearance, and the space around unions, valves, instruments, and equipment ports.
Do not select Schedule 80 because it "looks safer." Select it when the specified fitting standard, exact product data, working condition, and system design support the change.
Schedule Does Not Replace the Pressure-Temperature Check
ASTM D2466, D2467, and D2464 include burst-pressure requirements, but the Schedule label alone does not give one allowable operating pressure for every fitting and every service condition.
Before releasing the BOM, check the exact fitting size against the applicable SANKING product data, then review the real line conditions:
- Continuous working pressure
- Pump shutoff or maximum static pressure
- Dosing-pump pulsation and valve-closing surge
- Normal and maximum fluid temperature
- Chemical name and concentration
- Pipe, fitting, valve, union, flange, seal, and joint ratings
Socket or Threaded PVC Fitting?
Use a socket connection when the project is designed around solvent-cement PVC pipe and fittings and the pipe OD, fitting socket, adhesive system, and installation procedure are all compatible.
Move to the threaded-fitting review when the connection point is a threaded instrument, valve, pump port, removable equipment connection, or an existing threaded system. For threaded Schedule 80 PVC fittings, D2464 is the standard to check.
Do not convert from socket to thread simply because an adapter makes the parts physically connect. The thread form, component materials, service condition, maintenance frequency, and mechanical load still need review.
For a broader connection comparison, see socket, threaded, and flanged connections for plastic valves.
A Common Threaded-Joint Failure: Metal Male Thread Into Plastic Female Thread
A metal male tapered thread can become a wedge when it is driven too far into a plastic female fitting. The metal part does not yield like the plastic body. Excess tightening raises circumferential stress around the female threaded section and can start cracking during installation or later under pressure and temperature cycling.
When the drawing shows a metal-to-PVC threaded transition, check the thread form first. Then check the manufacturer's installation instructions, engagement, sealing method, wrench use, equipment alignment, and external load. More tightening is not a reliable fix for leakage.
Field check: If the plastic female boss shows whitening, distortion, a hairline crack, or heavy wrench marks around the thread, stop and review the fitting and installation method before pressurizing the line.
Three Mismatches to Catch Before Installation
1. The PO only says "2 inch"
The nominal size looks complete, but the dimensional system is missing. Confirm ASTM/IPS, DIN, JIS, CNS, or another specified system before matching the socket or valve end.
2. ASTM pipe is mixed with DIN metric fittings
A similar nominal label does not make the outside diameters or socket dimensions equal. The parts may be loose, may not insert correctly, or may require an unintended transition.
3. Thread name is missing
"Threaded 2 inch" is still incomplete. Confirm the actual thread system and the male/female interface before ordering the fitting, valve, or equipment adapter.
Match the Fitting Standard to the Valve End
The fitting can be correct and the valve can still be wrong for the line. A PVC ball valve may be supplied with socket, threaded, union, or flanged ends, and the nominal size alone does not identify the connection standard.
Before approving PVC ball valves, match the valve end to the pipe and fitting system:
- Nominal size and actual OD system
- Socket, threaded, true-union, or flanged end
- ASTM/ANSI, DIN, JIS, CNS, or other dimensional requirement
- Thread form where a threaded end is used
- Operating and peak pressure
- Operating temperature
- Fluid and concentration
- Valve body and seal materials
For filtration, RO, pump-room, and dosing systems, the Industrial Water Treatment Piping solution shows why the pipe, fittings, valves, seals, and line duty should be reviewed together before the BOM is locked.
Check the Actual SANKING Fitting Before Claiming ASTM Compliance
A standard number on a specification sheet is useful only when it matches the exact fitting being purchased. Product family, material, size, connection, manufacturing route, test scope, marking, and document revision all matter.
Review the available SANKING plastic fittings, then confirm the evidence for the selected PVC fitting rather than extending one document across the entire catalog.
| Evidence to verify | What it can confirm | Status for this page |
|---|---|---|
| Product dimensional sheet | Actual size range, socket or thread dimensions, wall dimensions, and drawing revision. | 需企业确认 |
| Pressure-temperature data | Allowable product use for the stated size and temperature basis. | 需企业确认 |
| Burst or other test record | What was tested, test method, sample identity, result, date, and report scope. | 需企业确认 |
| Product marking or packaging photo | How material, size, Schedule, standard, brand, or traceability is identified on the supplied product. | 需企业确认 |
| Third-party certificate | Only the products, sizes, materials, standards, and conditions listed within the certificate scope. | 需企业确认 |
Do not describe a fitting as "certified to ASTM D2466" or "ASTM D2467 certified" until the certificate type, issuer, product scope, and exact supplied item have been verified. Conformance to a product specification and third-party certification are not the same claim.
What a PVC Fitting BOM Should Include
A useful BOM removes the assumptions that cause socket and thread mismatches. Include enough information for the fitting, pipe, and valve to be checked as one connection.
- PVC material
- Fitting type: elbow, tee, coupling, reducer, adapter, union, cap, or other item
- Nominal size
- Schedule 40 or Schedule 80
- Applicable product standard: D2466, D2467, D2464, or another required standard
- Pipe standard and actual outside-diameter system
- Socket or threaded connection
- Thread form where applicable
- Working and peak pressure
- Normal and maximum temperature
- Fluid and concentration
- Connected valve or equipment interface
- Quantity
- Required drawing, inspection, test, marking, or certification documents
Check the Pipe, Fitting, and Valve Connection Before the PO Is Released
Send your PVC pipe standard, Schedule, outside diameter, fitting list, working conditions, and valve connection for compatibility review. Include a drawing or BOM when ASTM, DIN, threaded, or mixed-standard connections appear in the same system.
Send Your PVC Fitting ListASTM D2466 and D2467 FAQ
What is the main difference between ASTM D2466 and D2467?
D2466 covers PVC Schedule 40 fittings. D2467 covers PVC Schedule 80 fittings. Both include requirements for the fitting product such as materials, workmanship, dimensions, and burst pressure. The final system selection still requires the exact size, pressure, temperature, fluid, and connection review.
Does Schedule 80 always mean a higher allowable system pressure?
No single pressure value applies to every Schedule 80 fitting. Check the exact fitting size and product data at the real operating temperature, then compare that limit with the pipe, valve, joint, and other connected components.
Can Schedule 40 ASTM D1785 pipe connect to a Schedule 80 PVC fitting?
An IPS socket connection may be dimensionally compatible where the applicable pipe OD and fitting socket are designed to work together. Do not approve the combination from the Schedule labels alone. Confirm the exact dimensions, fitting standard, joint procedure, and pressure-temperature requirements.
Which ASTM standard applies to threaded Schedule 80 PVC fittings?
ASTM D2464 covers threaded PVC Schedule 80 pipe fittings. Confirm the actual thread form and mating component as a separate step; a nominal inch size does not make different thread systems interchangeable.
Do D2466 and D2467 cover CPVC fittings?
No. ASTM identifies separate CPVC fitting specifications. Schedule 40 socket CPVC fittings are addressed by F438, Schedule 80 CPVC fittings by F439, and threaded Schedule 80 CPVC fittings by F437.
Can ASTM and DIN PVC fittings with the same nominal size be mixed?
Do not assume they can. Confirm the actual pipe outside diameter, socket or thread dimensions, and transition method. Similar nominal size labels do not establish dimensional interchangeability.
Standard status reviewed: August 19, 2026.
ASTM D2466-24, D2467-24, and D2464-23 were listed by ASTM as active editions at the time of review. Proposed revision work does not replace the active published edition until ASTM issues a new version.
Confirm the edition specified by the project and recheck the ASTM status before final publication, tender submission, or compliance approval.
