Facing reference
Tongue and Groove Flanges
A tongue-and-groove joint pairs a projecting tongue with a matching groove. The two faces and the confined gasket dimensions must be specified together.
A matched facing pair
The tongue enters the mating groove around the bore. Request the complete pair or identify which half is needed for replacement. The tongue and groove widths, depths and diameters are governed by the selected standard or approved drawing.
Gasket confinement
The gasket occupies the specified sealing region within the joint. Its dimensions and compressed behaviour must suit the available space. Do not substitute a generic full-face or raised-face gasket without engineering approval of the seating arrangement.
Different from male and female
Tongue-and-groove and male-and-female facings describe distinct mating geometries. The terms should not be used interchangeably on an order. Confirm the exact facing designation and dimensions, especially where only one existing flange is available for inspection.
Selection reference only. Offered scope, technical compliance and availability are confirmed against the complete project enquiry.
Mating face and gasket requirements
For Tongue and Groove Flanges, face geometry, gasket selection and assembly loading must be reviewed together. Confirm the complete mating pair before ordering.
| Parameter / designation | Technical information | Selection requirement |
|---|---|---|
| Tongue component | Specify projection width, height and seating dimensions. | Identify which mating component carries the tongue. |
| Groove component | Specify recess width, depth and required clearance. | Verify compatibility with the actual tongue and gasket thickness. |
| Gasket location | Select gasket dimensions and material for the confined seating arrangement. | Do not substitute a gasket intended for a different facing. |
| Alignment and inspection | Check mating concentricity and damaged edges before assembly. | The tongue must not bottom out in a way that prevents the intended gasket loading. |
Compare related options
Compare Tongue and Groove Flanges with the related forms or references below. A related product is not necessarily a permissible substitute.
| Related product / reference | Distinction | Check before selection |
|---|---|---|
| Raised Face (RF) Flanges | A raised face provides a gasket seating surface inside the bolt circle. Specify the face dimensions, finish and gasket as a coordinated joint requirement. | RF dimensions under the exact flange standard and designation |
| Flat Face (FF) Flanges | A flat face has no raised gasket seating step. Confirm the gasket coverage, mating flange material and joint loading rather than identifying it only by appearance. | Type, construction, material and applicable standard |
| Ring Type Joint (RTJ) Flanges | An RTJ face uses a machined groove and a matching metal ring gasket. Ring and groove designations must be specified as a system, not chosen by nominal pipe size alone. | Flange standard, connection designation and groove details |
| Male and Female Flanges | A projecting male face mates with a recessed female face. Specify the full seating geometry and gasket requirements rather than substituting tongue-and-groove terminology. | Male, female or matched pair |
| Lap Joint Assembly | In a lap-joint assembly, the stub end provides the gasket seating surface. The separate backing flange transfers bolt load and can rotate for alignment before tightening. | Backing flange and stub-end designations separately |
Inspection, documents and delivery
Define acceptance requirements for Tongue and Groove 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 | Seating diameter, face profile, recess/projection and mating clearances. | 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 | Gasket dimensions/material, mating flange and bolting procedure. | 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 Tongue and Groove
Specify the complete joint and design conditions. This checklist is not a dimensional table or an engineering approval.
| Item | Requirement |
|---|---|
| Pair | Tongue side, groove side or complete mating set |
| Geometry | Facing diameters, tongue/groove widths and depths |
| Gasket | Dimensions, material and compression requirements |
| Reference | Standard/edition or approved mating drawing |
Continue the specification