How a Headed Bolt is Manufactured  Step 1
Raw material is selected from bonded storage racks. Blanks are cut to size and lubricated before hot forging.
 Step 3
After the forging process, parts are routed to heat treatment for normalize and temper. Parts are then subjected to numerous secondary operations, depending on the customers requirements and the part configuration. |
 Step 4 (Hot rolling threads)
Exotic material require hot rolled thread via induction heating in insure defect free threads and grain flow for safety critical applications. |
Step 5
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| Fatigue Testing |
Stress Durability |
Penetrant Inspection |
Tensile, shear
and double
shear testing | |
Step 6
After the secondary operations are completed, destructive and non-destructive testing is performed per blueprint specification. Testing is extensive and includes the following processes; tensile strength, fatigue, grain flow and size, full metallurgical examination, stress rapture, micro hardness, penetrant and magnetic particle inspection along with hydrogen determination for titanium alloys. |
 Step 7
Single element thread gauging for final inspection which includes system 22 and 23 safety critical criteria per MIL-S-8879 and MIL-S-7742 specifications. |
 Step 8
Helix, flank angles and root radius are inspected on optical comparators to insure parts exceed thread specification criteria. |
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