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.
Sgriwiau cyfuno bollt pen hecsagon cryfder uchel ar gyfer strwythurau dur, a ddefnyddir yn bennaf mewn pontydd rheilffordd a phriffyrdd, strwythurau dur boeler, gweithfeydd diwydiannol, adeiladau sifil uchel, strwythurau twr a mast, peiriannau codi a'u mae angen i strwythurau dur ddefnyddio cyfuniadau bollt cryfder ffrithiant -teip uchel- ar gyfer sgriwiau. Fe'i nodweddir gan dodecagon ychwanegol ar ddiwedd y bollt, a elwir hefyd yn y bollt. Wrth osod, rhaid defnyddio wrench trydan arbennig. Mae dau ben soced i fyny ac i lawr, mae un wedi'i osod ar gorff hecsagon y cnau, a'r llall wedi'i osod ar gorff decagon y sgriw hecsagon allanol. Wrth dynhau, cymhwyswch rym clocwedd i'r cnau, a rhowch rym gwrthglocwedd cyfartal i gorff dodecagon y bollt, fel bod y cysylltiad rhwng diwedd y sgriw hecsagon allanol a'r corff dodecagon yn destun cneifio torsional nes bod y gwddf cneifio. Hyd yn hyn, mae'r gosodiad wedi'i gwblhau. Mae'r sgriw hecsagon allanol cryfder dirdro hwn yn un-sgriw defnydd amser ac yn gyffredinol ni ellir ei dynnu ar ôl ei osod.
Dyma gyflwyno a defnyddio'r sgriw cyfuniad.