Custom Tapered Shoulder Socket Head Bolts

 

These custom tapered shoulder socket head bolts were manufactured using 4140 alloy steel material with 28-32 HRC hardness and zinc clear finish.  The shoulder diameter tapers form 0.78" down to 0.75" and the head diameter was set to 1.00 +/-.015".  Underneath the shoulder approximately .55" of 3/8-24 2A thread was rolled with thread relief allowance of roughly .085".  

Custom Drilled Hole Grade 10.9 Carriage Bolts

 

These custom carriage bolts were produced to our customer's drawing to class 10.9 characteristics with black oxide finish.  Approximately 27MM of M10-1.5MM 6G thread was rolled underneath the square shoulder and a 3MM hole was drilled through one side of the shoulder.  The square shoulder was produced to 10MM across the flats. Under the head a R45 radius was maintained to match the mating washer.