Square Bolt Manufacturers

Zhejiang Leader Fastener Co.,Ltd is a production\design\sales and after-sales as one of the fasteners business. Leader-Fastener®  locates in Haiyan of Zhejiang Province, which is China fastener village. It close to Shanghai\Ningbo\Zhapu ports. The geographical position is superior, the transportation is convenient, has created the natural superiority for the export. 
Our main products include all kinds of and all sizes of fasteners used in automobile industry,  the main standard are DIN/ANSI\ASME/JIS/UNI/ISO/AS/BS/GB and so on. Carbon steel bolts mainly have 4.8、5.8、6.8、8.8、10.9、12.9, nuts mainly have 4、6、8、10, the main material of stainless steel fastener is 304、316. We could also produce non-standard items and special fasteners according to your requirements. Our products are extensively used in the field of auto production, industrial machines and municipal construction and are also exported to many countries in North America, South America, Europe, South Africa and Middle-East Asia.
The square head bolt has a square style head, the top of which is fully chamfered with the diameter of chamfer circle equal to the maximum width across flats, F. Compared to hex bolt, the square head bolt is not so prevalent in modern engineering. It is usually required during refurbishment of old project. Square Head Bolts were once the most common form of bolt, until they were replaced by hex head bolts. They are covered under ANSI Standard B18.2.1 and are now most commonly used for aesthetic purposes to provide a rustic look .
Square head bolt design enables an easier wrench grip for nut tightening. They are usually used in new construction along with square plate washer and taper washers. There is also a requirement to mimic an older fastener aesthetic in both new and old buildings. Square bolts are now most commonly used for aesthetic purposes to provide a rustic look in a new structure or to match existing fasteners in an older structure. Square lag screws are also used for these purposes.