about us
Ningbo
Fortune Auto Parts Manufacture Co., Ltd.
1.Manufacturer qualified with certificates like ISO9001
2.More than 15 years experience exporting all kinds of wheel weights, Tire Valves, Tire Repair Kits, Wheels
3.Never use inferior material
4.100% tested before shipment
Choose us
Ningbo Fortune Auto Parts Manufacture Co., Ltd. specializes in auto parts manufacturing.
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IATF 16949:2016
FORTUNE -
TUV
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FCC-ID
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ISO 9001:2015
Customer Visit News
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Conical (60°) vs Ball Seat (R12/R14) vs Flat Seat: Hub Contact Stress Distribution and Torque Retention in Wheel Fasteners
The seat type — conical, ball, or flat — controls where the lug nut contacts the wheel pocket and how the contact stress is distributed. A 60-degree conical seat distributes stress over a ring-shaped contact zone with peak Hertzian contact stress around 600 MPa at the design preload. A ...
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Wheel Bolt Grades 8.8 vs 10.9 vs 12.9: Why 10.9 Is the Safer Choice for Most Automotive Aftermarket Applications
Per ISO 898-1, grade 8.8 bolts carry 640 MPa yield strength, 10.9 carries 900 MPa, and 12.9 carries 1100 MPa. The jump from 8.8 to 10.9 is +41% yield strength; the jump from 10.9 to 12.9 is another +22%. For the aftermarket, 10.9 hits the sweet spot: it gives you a meaningful safety margin over ...
