The BF-133 is a professional-grade weight-stack triceps machine produced by SIGMA GYM, a Russian fitness equipment manufacturer based in Samara. Part of the company's Professional Class S range, it is built for high-traffic commercial gym environments and targets the three-headed muscles of the upper arm in strict isolation.
The welded steel frame uses 60×60×3 mm and 80×40×3 mm profile tubing finished with a durable powder coating, with steel sourced from Turkish production. The weight stack holds 17 plates of 5 kg each — 85 kg total — mounted with plastic bushings that deliver near-silent plate travel during sets.
The 6 mm cable runs inside a PVC sheath rated to 800 kg break force, and the weight selector operates via a flexible cord with a magnetic closer for positive, reliable engagement. The padded seat is built on a 12–15 mm plywood base with high-density foam (140–160 units) and vinyl leather upholstery for long-term durability.
Rubber foot pads protect flooring and eliminate the need for floor anchoring. At 185 kg installed and measuring 1 230 × 1 170 × 1 850 mm, the machine is stable and compact for its load capacity.
It is certified to GOST R 56445-2021, GOST R 56900-2020, GOST R 56903-2022, and produced under TU 32.30.14-001-79567603-2023 — the current Russian national standards for sports and fitness equipment.
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