Import 8pcs 40p Solid M16 Jis B6339:1998 Pull Stud — Buy in wholesale FOB from Supplier in China

This pull stud set comprises eight M16 retention knobs manufactured to JIS B6339:1998, the Japanese industrial standard for tapered tool interface geometry in machining centres. Each stud is machined from 20CrMnTi alloy steel, a chromium-manganese-titanium grade selected for its response to case-hardening treatments. The surface hardness reaches HRC 53-57 after carburising and quenching, while the threaded section and core remain relatively softer to resist thread galling and absorb shock loads. The black oxide finish provides corrosion resistance without dimensional build-up. The 40-degree pull angle (40P) matches standard BT-40 and equivalent taper tooling systems.

The differential hardness profile is achieved through controlled carburising depth: the outer case sustains high contact stress against the spindle claw, the thread zone permits elastic deformation during repeated tool changes, and the low-hardness core resists brittle fracture under sudden pull forces. Precision turning on all functional surfaces ensures concentricity of the pull thread relative to the taper locating diameter. The supplier notes that custom designs are accepted for specific machine models, suggesting in-house turning and heat-treatment capability rather than pure trading.

These studs suit importers servicing high-end CNC machining centres, tool holder rebuilders, and spindle repair workshops. The JIS B6339:1998 specification remains relevant for Japanese-built machines and many Taiwanese clones. Buyers should confirm whether their spindles use the solid or hollow pull stud variant, as coolant-through spindles require hollow construction. The supplier states each piece is tested, though the test method is not specified, buyers should request pull-load and fatigue test data. Packaging, MOQ, and lead time are absent from the listing and must be confirmed directly with Luoyang Xincheng Precision Machinery.

Luoyang Xincheng Precision Machinery Co., Ltd. is located at No 198, Jiudu Road, Luoyang 471002, Henan Province, China. The supplier is classified as an imported-tier vendor with a harbor trust tier. The response rate shows 0.00 percent with zero average response hours, indicating no message engagement data is available through this channel. The supplier describes itself as a manufacturer, exporter, and supplier of pull studs, suggesting vertical integration from material procurement through finishing.

The listing emphasises in-house heat treatment and precision turning capability, supported by the technical description of differential hardness control. No information is provided about factory size, number of employees, annual revenue, or named clients. The address places the company in Luoyang, an industrial city with established machinery and bearing manufacturing clusters. Buyers should verify ISO 9001 or equivalent quality system certification, factory audit status, and whether the company holds any OEM approvals from machine tool builders. The willingness to accept custom designs indicates engineering flexibility, but prototype lead times and minimum order quantities for custom work are not stated.