316 Stainless Bimini Top Cap Tube

The 316 Stainless Bimini Top Cap Tube from Wudi Zhibo Metals Co., Ltd. is an investment-cast marine hardware fitting designed to terminate and eye-connect the frame tube of a bimini top or boat canopy. Fabricated from AISI 316 stainless steel (UNS S31600), the cap tube resists crevice corrosion in salt spray better than 304-grade alternatives, a property derived from its 2-3% molybdenum content. The external eye end accepts a clevis pin or shackle for tensioning lines, while the barrel portion slides over and clamps to 7/8 inch or 1 inch diameter tubing. The source specifies a high-polish surface finish, though no Ra (roughness average) value is given, and the investment casting process is claimed to yield solid, durable geometry for marine service.

Investment casting, also called lost-wax casting, allows near-net-shape production of the eye-end geometry with minimal machining, preserving material continuity at the eye-barrel junction where sand-cast or fabricated weldments might create stress risers. The 316 alloy provides pitting resistance equivalent number (PREN) around 23-25, adequate for temperate marine atmospheres but not for prolonged immersion in warm chloride water without additional protection or higher alloy grade. The screw-fastening mechanism mentioned in the source secures the cap to the tube via a stainless machine screw; thread pitch, screw diameter, and whether a sealant or grommet is included are not stated. Two sizes are catalogued, 7/8 inch and 1 inch nominal tube fit, but the exact inside diameter, wall engagement depth, and weight are absent from the data.

Primary buyers are boat builders, marine chandleries, and shade-structure fabricators serving the recreational yacht and small-craft market. The low stated MOQ of one piece suits replacement-part distributors and custom rigging shops that cannot commit to bulk orders. Standard packing is a bubble bag plus carton, which may suffice for domestic shipment but requires reinforcement for ocean freight. Buyers should confirm whether the investment casting is solution-annealed after foundry work to restore corrosion resistance, and whether the high-polish finish is passivated to ASTM A967 standards. Lead time, exact Incoterms, and port of loading are not published and must be negotiated with Wudi Zhibo Metals Co., Ltd.

Wudi Zhibo Metals Co., Ltd. operates from No.161 Delixi Industrial Zone, Binzhou, Shandong Province, China. The company holds a Harbor trust tier and lists a product range that extends beyond bimini hardware to include anchors, hinges, deck fillers, fishing rod holders, eye plates, eye bolts, shackles, turnbuckles, thimbles, and carabiners. The response rate is recorded at 0.00 percent with zero average response hours, suggesting either a new listing, a dormant account, or unpopulated metrics. No factory area, employee count, year of establishment, revenue, or named OEM clientele appears in the source profile.

The source description frames Wudi Zhibo as a professional manufacturer of stainless steel marine and rigging hardware with stock availability and low MOQ acceptance. Yet it does not cite ISO 9001, marine-type approval (e.g., RINA, DNV, ABYC), or material test standards (ASTM A351, A743). Buyers should therefore request a company profile, factory audit report, or sample batch with mill certificate before committing to volume. The investment casting specialisation implies in-house or partnered foundry capacity, but the exact scope of vertical integration is unclear without direct enquiry.