Standard reference
JIS Flanges
A JIS flange enquiry needs the complete standard number and edition, not only a nominal size and a K designation.
Identify the specific standard
State the full JIS reference, flange type, nominal size, material and rating designation. Different references may have different scope and material requirements. A general Japanese-standard description does not define the exact connection to manufacture or inspect.
Match the interface consistently
Check drilling, bore, facing and thickness against the required standard and mating drawing. Do not convert a K designation into an ASME class or PN number and assume dimensional compatibility. Each system needs its own verification.
Material and documentation
Provide the required material designation, condition and design temperatures. Identify the project inspection and documentation requirements, including any approved material equivalence. Equivalent-material proposals need review beyond a similar commercial grade name.
Selection reference only. Offered scope, technical compliance and availability are confirmed against the complete project enquiry.
Standard scope and ordering designation
Use JIS only within its applicable scope. Obtain numerical dimensions and rating tables from the governing standard and the approved project documentation.
| Parameter / designation | Technical information | Selection requirement |
|---|---|---|
| Standard and edition | JIS | Record the exact edition and applicable type/series in the purchase description. |
| Scope | A JIS flange enquiry needs the complete standard number and edition, not only a nominal size and a K designation. | Check size, material and component scope before applying any table. |
| Dimensional designation | Nominal size, series/type, rating designation and dimensional units. | Matching nominal size does not prove matching bolt circle, thickness or facing. |
| Material-dependent rating | Material group, design temperature and any standard-specific rating rules. | Do not read a class number as a direct pressure limit or transfer ratings between materials. |
| Related requirements | Gaskets, fasteners, attachment welds and the project piping/equipment code. | The flange standard does not replace complete assembly design or installation requirements. |
| Legacy or alternate designations | Existing drawing number, original standard and proposed replacement designation. | Verify dimensions and suitability rather than assuming historical names are equivalent. |
Compare related options
Compare JIS Flanges with the related forms or references below. A related product is not necessarily a permissible substitute.
| Related product / reference | Distinction | Check before selection |
|---|---|---|
| EN 1092-1 Flanges | EN 1092-1 flange enquiries use a steel flange type, DN and PN designation together with the exact material and facing requirements. | EN 1092-1 edition, type, DN and PN |
| ASME B16.5 Flanges | An ASME B16.5 enquiry identifies the flange type, nominal size, class, material and facing under the specified edition. The standard name alone does not define a complete joint. | ASME B16.5 edition, flange type, NPS and class |
| Flange Pressure Ratings | A flange class, PN designation or table is not a universal allowable pressure. The design must use the specified standard, material and temperature together. | Exact edition and flange/rating designation |
Inspection, documents and delivery
Define acceptance requirements for JIS Flanges in the purchase order. Required examinations and documents depend on the material, design and project specification.
| Review stage | Information to confirm | Order requirement |
|---|---|---|
| Material identity and traceability | Specification, grade, heat/lot identification and the required material certificate. | Agree documentation and marking before manufacture; visual appearance cannot verify alloy identity. |
| Dimensional verification | Critical dimensions from the selected standard or controlled drawing. | Identify inspection points, tolerances, units and drawing revision. |
| Surface and end condition | Gasket-contact surface, attachment end, edges and any coating exclusions. | State finish and visual acceptance criteria; agree protection of machined surfaces. |
| Supplementary examinations | Any specified PMI, NDE, hardness, impact, corrosion or other tests. | Define the method, sampling and acceptance criteria; tests are not automatically included. |
| Assembly compatibility | Adjoining components, weld or mechanical interface and project service conditions. | Design approval and correct assembly remain separate from a dimensional inspection report. |
| Packing and order release | Quantity, identification, surface protection, documents and delivery destination. | Agree preservation, packaging and release requirements with the order. |
Enquiry checklist
Details for JIS
Specify the complete joint and design conditions. This checklist is not a dimensional table or an engineering approval.
| Item | Requirement |
|---|---|
| Reference | Full JIS number and edition |
| Designation | Type, nominal size and rating designation |
| Interface | Facing, bore, drilling and mating drawing |
| Material | Exact designation, condition and approved equivalences |
Continue the specification