BX-1000 GROOVE DIAMETER GAUGE, per API 6A
Range: 2.6″ to 13″ diameter
API 6A ring grooves are divided into three ring types, BX, R, and RX. Each type has different configurations and is designated by the type and a number, i.e. BX 150, R 41, etc.
API mandates the inspection of ring grooves. The necessary dimensions of a groove are clearly specified in API 6A. To pass API requirements, these dimensions must be met. For BX Grooves, the groove’s major diameter and width are specified. For R and RX Grooves, API specifies the groove’s pitch diameter and width.

API 6A Seal Ring Groove Gages (BX & R/RX)
A ring groove is basically a closely dimensioned groove cut into the face of a pipe flange. Together with a gasket, a groove helps create a seal between parts, so it is important that a groove meets designated specifications.
API 6A ring grooves are divided into three ring types, BX, R, and RX. Each type has different configurations and is designated by the type and a number, i.e. BX 150, R 41, etc.
API mandates the inspection of ring grooves. The necessary dimensions of a groove are clearly specified in API 6A. To pass API requirements, these dimensions must be met. For BX Grooves, the groove’s major diameter and width are specified. For R and RX Grooves, API specifies the groove’s pitch diameter and width.

|
Groove |
Groove Diameter or Grove Width |
Range^ |
Contact Points Included* |
Indicator
Travel |
Indicator
Resolution |
Description |
Model |
 |
BX, R, RX |
Diameter |
2.6” - 13”
(66 mm - 330.2 mm) |
Customer Choice |
- |
- |
Ball mic gage includes customer specified ball contact points (no indicator) |
BX-900 |
|
BX, R, RX |
Diameter |
2.6” - 13”
(66 mm - 330.2 mm) |
T188 |
.250” |
.0005” |
6A groove diameter gage includes T188 contact points* |
BX-1000 |
|
BX, R, RX |
Diameter |
2.6” - 13”
(66 mm - 330.2 mm) |
T188 |
.500" |
.0001” |
6A groove diameter gage with .0001” resolution includes T188 contact points* |
BX-1000-1 |
 |
BX, R, RX |
Width |
.375” -1.5”
(9.5 mm - 38.1 mm) |
T072 |
.250” |
.0005” |
6A groove width gage includes T072 contact points* |
BXG-1000 |
 |
BX, R, RX |
Width |
.375” -1.5”
(9.5 mm - 38.1 mm) |
T072 |
.500" |
.0001” |
6A groove width gage with .0001” resolution indicator, includes T072 contact points* |
BXG-1000-1 |
 |
BX, R, RX |
Width |
.375” -1.5”
(9.5 mm - 38.1 mm) |
T072 |
5 mm |
.01 mm |
6A groove width gage with metric indicator, includes T072 contact points* |
BXG-1000-M |
|
BX, R, RX or Custom |
Width |
.312” - 2.375”
(8 mm - 60.3 mm) |
T072 |
.250” |
.0005” |
Groove width gage includes T072 contact points* |
BXG-1002 |
|
BX, R, RX or Custom |
Width |
.312” - 2.375”
(8 mm - 60.3 mm) |
T072 |
.500” |
.0001” |
Groove width gage with .0001” resolution indicator, includes T072 contact points* |
BXG-1002-1 |
|
BX, R, RX or Custom |
Width |
.312” - 2.375”
(8 mm - 60.3 mm) |
T072 |
5 mm |
.01 mm |
Groove width gage with metric indicator, includes T072 contact points* |
BXG-1002- M |
 |
- |
- |
- |
- |
.500” |
.001” |
BX/BXG ball height setting gage, ½” X ½” U-notch base |
PD-BX |