500 A4-80 cap screws for a subsea application, thread rolled, penetrant tested and yield tested
500 M16-2.0 × 70 mm fully threaded hex head cap screws in A4-80 per ISO 3506-1: machined from bar, thread rolled, liquid penetrant tested to ASTM A962M S56 and axial extension yield tested per ISO 3506.
What the customer needed.
A subsea application called for 500 M16-2.0 × 70 mm fully threaded hex head cap screws in property class A4-80 per ISO 3506-1, liquid penetrant tested to ASTM A962M S56 and axial extension yield tested per ISO 3506.
A4 is the molybdenum-bearing 316 stainless group for chloride and marine service, and A4-80, strain hardened to 800 MPa, is the strongest standard stainless metric fastener.
The parts.
500 M16-2.0 × 70 mm fully threaded hex head cap screws, property class A4-80 per ISO 3506-1, machined from bar and thread rolled.
How it turned out.
The order was machined from bar, thread rolled, liquid penetrant tested to ASTM A962M S56 and axial extension yield tested per ISO 3506.
A4-80 at M6 to M20 calls for 800 MPa minimum tensile and 600 MPa minimum yield.
From order to shipment.
- STEP 01
Machined from bar
The cap screws machined from bar.
- STEP 02
Thread rolled
The M16-2.0 threads rolled, full length.
- STEP 03
Penetrant tested
Liquid penetrant tested to ASTM A962M supplementary requirement S56.
- STEP 04
Yield tested
Axial extension yield tested per ISO 3506.