Abstract: A bolt has a bolt body including a screw part, a head part formed at an upper end of the screw part, and a flange part formed at a lower end of the head part; and an unconductive ring-shaped resinous member covering a peripheral portion of the flange part. The flange part has a disk-shaped flange body portion; and a seat surface-forming portion having a seat surface which is pressed against a portion where the bolt is to be mounted. The ring-shaped member has an edge part which is located at a position nearer to a lower end of the screw part than the seat surface and outward from the flange body portion and an annular skirt part whose diameter gradually increases to the edge part. The annular skirt part is so formed that it deforms when the bolt is mounted on the portion where the bolt is to be mounted and forms an annular liquid-tight sealing portion for the portion where the bolt is to be mounted.

Abstract: A nut 1 of the present invention has a nut body 2 including a female screw part 5 extended axially and a flange part 4 projected outward from a side surface of the nut body 2; and an unconductive ring-shaped resinous member 3 covering a peripheral portion of the flange part 4. The flange part 4 has a disk-shaped flange body portion 41; and a seat surface-forming portion 42 which is extended downward from a lower surface of the flange body portion 41, has a smaller diameter than the flange body portion 41, and has a seat surface 43 to be pressed against a portion where the nut is to be mounted. The unconductive ring-shaped resinous member 3 has an edge part 31 located below the seat surface 43 and outward from the flange body portion 4; and an annular skirt part 32 whose diameter gradually increases to the edge part 31.

Abstract: A bolt has a bolt body including a screw part, a head part formed at an upper end of the screw part, and a flange part formed at a lower end of the head part; and an unconductive ring-shaped resinous member covering a peripheral portion of the flange part. The flange part has a disk-shaped flange body portion; and a seat surface-forming portion having a seat surface which is pressed against a portion where the bolt is to be mounted. The ring-shaped member has an edge part which is located at a position nearer to a lower end of the screw part than the seat surface and outward from the flange body portion and an annular skirt part whose diameter gradually increases to the edge part. The annular skirt part is so formed that it deforms when the bolt is mounted on the portion where the bolt is to be mounted and forms an annular liquid-tight sealing portion for the portion where the bolt is to be mounted.

Abstract: A self tapping bolt which fastens a mounting member and a receiving member while the bolt cuts internal threads on an inner surface of a tap drill hole prepared in the receiving member. The bolt includes at least one groove formed near an end of a threaded portion of the bolt and a blade for cutting the internal threads. The bolt includes the feature of the blade being formed only on a rear end surface of the groove relative to a rotational direction of the bolt which is screwed into the tap drill hole.

Abstract: A self tapping bolt is provided, which fastens a mounting member and a receiving member while the bolt cuts internal threads on an inner surface of a tap drill hole prepared in the receiving member. The bolt includes at least one groove formed near an end of a threaded portion of the bolt and a blade for cutting the internal threads. The bolt has the features that the blade is formed only on a rear end surface of the groove relative to a rotational direction of the bolt which is screwed into the tap drill hole.

Abstract: A reciprocating piston type compressor for compressing refrigerant gas is provided with a main housing which includes a plurality of parallel cylinder bores arranged around the longitudinal axis of the cylinder block. The main housing has first and second cylinder blocks connected to each other by a plurality of bolts, the cylinder blocks including inner clamping faces and abutting faces. A plurality of pistons are slidably provided within the cylinder bores. An axially extending drive shaft is supported by the main housing for rotation through a pair of bearings. A swash plate is mounted on the drive shaft for rotation with the drive shaft. A pair of thrust bearings are provided between the swash plate and the inner clamping faces of the cylinder blocks to clamp and hold the swash plate therebetween. The clamping force on the thrust bearings from the inner clamping faces is controlled so that the clamping force does not exceed a predetermined allowable upper limit when the compressor is assembled.