We sometimes use combination screws in life, but do you know anything about combination screws? Maybe few people now understand the combination screw. If you don't want to know, you can read this news. Combination screw A combination screw refers to a combination of a screw with a spring washer and a flat washer after rubbing the teeth, combined and fastened together. The two-combination screw refers to a screw with only one spring washer or only one flat washer, or it can also be equipped with only one flower tooth. The national standard number of the combination screw is indicated by GB9074. The commonly used cross recessed small pan head three combination screw national standard is GB9074.8. This .8 refers to the small pan head. Also known as the head size of the pan head screw. Indicated by letters as PM. Professional combination screw manufacturers, the habitual display method is three-in-one PM. The commonly used cross recessed large pan head combination screw national standard is GB9074.4. Professional combination screw called large pan head. Or R head, or B head. That is to say, the head of this combination screw is larger and thicker than the head of the small pan head combination screw. There is also a commonly used external hexagon combination screw, which is a cross external hexagon combination screw. It is often called a socket hexagon combination screw. The national label is GB9074.13.
Há-styrktar sexhyrndar boltar samsettar skrúfur fyrir stálmannvirki, aðallega notaðar í járnbrautar- og þjóðvegabrýr, ketilstálmannvirki, iðjuver, háar byggingar, mannvirki fyrir turn og mastur, lyftivélar og þeirra stálbyggingar þurfa að nota núnings-gerð há-boltasamsetningar fyrir skrúfur. Það einkennist af auka dodecagon í lok boltans, einnig þekktur sem boltinn. Við uppsetningu þarf að nota sérstakan rafmagnslykil. Það eru tveir innstunguhausar upp og niður, annar er settur á sexhyrndan hluta hnetunnar og hinn er settur á decagon líkama ytri sexhyrningsskrúfunnar. Þegar hert er á skaltu beita réttsælis krafti á hnetuna og beita jöfnum krafti rangsælis á tvíhyrningshluta boltans, þannig að tengingin á milli enda ytri sexhyrningsskrúfunnar og tvíhyrningshlutans verður fyrir snúningsklippingu þar til hálsinn er klippt. Enn sem komið er er uppsetningunni lokið. Þessi torsion shear tegund há-ytri sexhyrningsskrúfa er einn-skrúfa og almennt er ekki hægt að fjarlægja hana eftir uppsetningu.
Þetta er kynning og notkun samsetningarskrúfunnar.