The material of the BONOSS wheel spacer studs/Bolts are high-strength alloy steel, forged process, ISO898-1 grade 12.9(partially grade 10.9) standard performance, the surface Anti-Rust of the studs were tested by a neutral salt spray(NSS) of ISO 9227 for 500 hours. Please refer to the test reports of relevant third-party authoritative testing institutions TUV and SGS.
Since the BONOSS studs have the same level or higher level of performance as the original studs/Bolts, the BONOSS extended studs can withstand greater tightening torques.
However, considering different wheels and original stud thread, we recommend using the torque recommended by the original car for locking.
In general, the tightening torque is as follows:
M12x1.25: 113NM(83.3Ft-tb)
M12x1.5: 113NM(83.3Ft-tb)
M14x1.25: 140NM(103.5Ft-tb)
M14x1.5: 140NM(103.5Ft-tb)
