8.5mm Speargun Shafts with 4 Fins 100cm To 200cm Spearfishing Harpoon 17-4PH Stainless Steel

Choose the right shaft

If your speargun takes an 8.5mm shaft, this 8.5mm speargun shaft gives you a straight, heat-treated 17-4PH stainless steel speargun option in 100cm to 180cm lengths. The 4 fins spear shaft design, with 3 shark fins and 1 rest tab, helps it seat cleanly and load predictably. You get 400g of solid feel, plus a 1.2x85mm flopper and 60 degree barb.

Built for repeated use

Made from 17-4PH stainless steel, then heat treated to about 45 hardness, it's built to resist bending and hold its shape through more dives. The laser-welded fins stay tidy, and the steel's natural magnetism after treatment is normal. Firm in the hand, smooth in the gun, and ready when you want a shaft that works without fuss. Add it to your setup if you want cleaner shots and fewer replacements.

Check your fit first

Diameter alone doesn't guarantee compatibility, so confirm length, tip layout, and your speargun specs before ordering. Pick the size that matches your setup, whether that's 100cm, 120cm, 150cm, or 180cm, and you'll get a better fit from the start. Fast courier delivery is available, so you can get back in the water sooner.