Hexagon Head Cap Screws

Metric & Multistandard Components Corp. item number #7931 is for British Hex Head Cap Screws. The British Whitworth thread form is available in three different thread series BSW (British Standard Whitworth), BSF (British Standard Fine), and BA (British Association). In general all three thread forms officially became obsolete in April of 1974 when the formal 10 year conversion to the true metric system was completed. 

Although British BSW and BSF fasteners are called out by fractional diameter and threads per inch similar to American fastener threads they differ in the thread form. Both BSW and BSF have full Whitworth thread form which is a 55 degree thread angle with radiuses root and crest.  

The third series BA (British Association) threads have a 47 ½ degree thread angle with radiuses root and crest. The BA series are not available in fine series and are called out by a number size. The numerically lower number is the larger size; example 2BA would be larger than 4BA. 

Typically British Hex Head Cap Screws are available in heat treated steel that is similar to U.S. Grade 5. Other materials such as stainless or brass are available.  Please contact a Metric & Multistandard Components Corp. customer service representative for further information and for all of your British needs.

Metric and Multistandard Components Corp.

Metric and Multistandard Components Corp. is the oldest and most experienced fastener supplier of Metric Fasteners and industrial components.  Metric & Multistandard stocks over 48,000 high-quality metric industrial components at all five of our locations.  Metric & Multistandard sales staff is technically trained to thoroughly understand the metric fasteners and industrial components that we sell.  Please click request a quote here.  To speak to a sales representative and learn more about Threaded Fasteners, please select one of our 5 US locations or 1 European location below to contact us.