It's very important to choose the screw for the assembled design of iron fence, because the whole balcony guardrail is fixed by this screw. And this should take into account the strength and service life of the entire guardrail. Once the screw fails, it is very dangerous for the whole assembled railing. In the balcony guardrail appeared in this decade, different manufacturers have launched a lot of assembly accessories, and a kind of accessories use a variety of screws.

有些厂家为了节省成本使用比较劣质的螺丝来组装阳台护栏，这样会造成很大的隐患啊，而且不同的配件需要针对性的使用不同的螺丝。比如现在市面上使用的拉伸料的固定座，这个固定座标准的配备的螺丝是不锈钢的拉铆螺丝，拉铆和管壁固定在一起然后螺杆扭进去，这样安装很稳固，强度也是经过检测部门检测过的。

In order to save cost, some manufacturers use inferior screws to assemble balcony guardrail, which will cause great hidden danger. Moreover, different accessories need to use different screws. For example, the fixed base of stretch material used in the market now is equipped with stainless steel riveting screws. The riveting and pipe wall are fixed together, and then the screw is twisted in, so the installation is very stable, and the strength has been tested by the inspection department.

 

而且因为拉铆把钻孔的边都包裹住了，这样孔边也不容易生锈，这样本来是好的组装方式，但是现在有些厂家为了节省成本使用自攻螺丝固定，自攻螺丝不能用在起主要作用力的地方的，为何这样说呢，因为管子相对都比较薄，自攻螺丝攻进去也只能考那么薄的管壁来支撑力。自攻螺丝前面小后面大很容易就松动了，松动了很容易脱落，而且自攻螺丝是直接攻入镀锌管内会破坏管子的涂层，自攻点很容易生锈。

Moreover, because the riveting covers the edges of the holes, it is not easy to rust. This is a good assembly method. But now some manufacturers use self tapping screws to fix them in order to save costs. The self tapping screws can't be used for the main force. Why do we say that? Because the pipes are relatively thin, the self tapping screws can only be used to test the thin pipes Wall to support the force. The self tapping screw is easy to loose when it is small in front and large in the back. If it is loose, it is easy to fall off. Moreover, the self tapping screw directly enters the galvanized pipe, which will damage the coating of the pipe, and the self tapping point is easy to rust.

但是因为自攻螺丝本身便宜，而且安装快捷方便，给很多的投机取巧的人提供了机会。这个是说的拉伸料固定座使用的螺丝，还有一个围栏用的三包围固定件，这个固定件是采用不锈钢的防拆螺丝，穿插锁。这样不管强度好，而且防拆防盗。

But because the self tapping screw itself is cheap, and the installation is fast and convenient, it provides opportunities for many opportunistic people. This refers to the screw used in the tensile material fixing base, and a three encircling fixing part for the fence. The fixing part is made of stainless steel anti detachable screw and inserted lock. In this way, no matter the strength is good, and it can be disassembled and burglarproof.