Shoulder-type Double-ended Stud

The shoulder-type double-ended stud incorporates a central shoulder between its two threaded ends, providing accurate axial location and load-bearing capability. This design ensures components such as transmission gears, crankshafts, or precision transmission parts are held at exact positions without shimming. By using a product, axial play is eliminated, alignment is improved, and connection stability is enhanced in high-precision assemblies where dimensional accuracy is critical.

Manufactured to ISO 898-1 Grade 10.9+, SAE J429 Grades 10.9/12.9, and GB/T 900 standards, the shoulder-type double-ended stud is made from 42CrMo or 35CrMo alloy steel. Heat treatment and precision shoulder grinding achieve strength grades 10.9–12.9, with tensile strength ≥1040 MPa and yield strength ≥940 MPa. Shoulder flatness is controlled to ≤0.01 mm, and perpendicularity is maintained within 0.02 mm/m to ensure precise positioning. Surface coatings such as Zn–Ni alloy or Dacromet provide ≥500 hours of salt spray resistance, suitable for demanding transmission environments.

Thread sizes range from M6 to M24, total lengths from 20 mm to 180 mm, shoulder diameters from 8 mm to 30 mm, and shoulder thicknesses from 2 mm to 10 mm. Thread lengths are customizable (typically 1.5d–2.5d). Cold forming and CNC grinding maintain tight tolerances (±0.02 mm) with smooth transitions to avoid stress concentrations. We can customize shoulder dimensions, thread specifications, overall length, and surface finish according to client drawings to meet exact precision positioning requirements.

We support manufacturers of precision components with custom shoulder-type double-ended stud solutions, backed by a monthly capacity of over 800,000 pieces. Our CNC grinding and precision inspection equipment ensure that each batch meets strict shoulder accuracy, concentricity, and mechanical performance standards. IATF 16949 certification guarantees full traceability. With specialized machining expertise and consistent precision, we provide reliable fastening solutions for high-accuracy assembly challenges.