SAE J530 dimensions of automotive pipe fitting adapters including types as follows:
FIGURE 1 —HEXAGON NIPPLE (130137)
FIGURE 2—HEXAGON REDUCER NIPPLE (130137)
FIGURE 3—ADAPTER (130139)
FIGURE 4—REDUCER ADAPTER (130139)
FIGURE 5—REDUCER BUSHING (130140)
FIGURE 6—COUPLING (130138)
FIGURE 7—REDUCER COUPLING(130138)
DIMENSIONS OF ADAPTERS AND REDUCER ADAPTERS AS FOLLOWS: