T head bolts with shoulder

a.) These type of screws are distinguished by the direction in which they tighten and loosen. Their main difference is their direction of rotation.

b.) Right-hand thread screw - Standard screws, tightened when turned clockwise and loosen when turned counterclockwise, used in most applications.

c.) Left-hand thread screw - Non-standard screws, tighten counterclockwise, primarily used in power or safety-related situations.

This is a specialized fastener designed for applications requiring both secure fastening and specific mechanical properties.

a.) Weld studs are threaded fastener that provide a durable and reliable hold once permanently integrated into an assembly. These studs feature "nibs" positioned either on the top or underside of the head, customized to meet the specific requirements of their intended application.

b.) This weld stud features three enlogated projections that are designed with linear projections that enhance the welding process by providing a larger contact area; These industrial fasteners are avaialble from Spring Lake in a variety of dimensions, materials, and thread diameters.

Very similar to DIN 6912 hexagon socket cap head screw, shoulder and dog point

a) External hexalobular socket (6 lobe) / metric thread / tapping thread for both ends. 

b) A double-end stud with collar is a type of fastener that features threaded ends on both sides and a non-threaded central collar or flange. Thread types of both sides can be customized according to customer's request, differen surface treatment is available upon request.