Flanged Hollow Dowel Bushing

Product Information:

This Flanged Hollow Dowel Bushing from Qimao Metal Manufacturer serves one purpose, giving locating pins a wear-resistant, replaceable home. Press it into your fixture plate—the flange sits flush, giving a positive stop every time. The hollow center accepts standard dowel pins with slip or press fit, depending on the setup. Ours different is the cold forming process. That keeps grain structure intact around the flange radius, exactly where machined bushings tend to crack under cycling loads. Controlled heat treatment lands hardness typically at HRC 50-55 on bearing surfaces. The bore gets a light reaming pass to clean up dimensional drift, so your pin insertion feels consistent—not too tight or loose,only suitable for assemble.

Product Specification:

Flanged Hollow Dowel Bushing material is 45# carbon steel as standard, with 40Cr or bearing steel options for higher load applications. The flange diameter and thickness follow your print, not a generic catalog spec. Wall thickness is calculated to keep enough shear strength while leaving room for the through-hole. Hardness runs HRC 50-55 on the case, with a core that stays tough at around HRC 35-40 to absorb impact without shattering. Surface finish inside the bore holds Ra 0.8µm max, so the mating pin doesn’t gall during insertion. Outside diameter is ground after heat treat to hold a tolerance of +0.015/-0.005mm for a reliable press fit into your plate. We also apply a light rust-preventive oil before packaging—nothing heavy, just enough to get you through storage and assembly without a cleaning headache.

Core Feature:

• Flanged Hollow Dowel Bushing cold-forged grain structure – The flange and barrel share continuous grain lines, no cutting interruptions. That translates to roughly 30% better resistance to impact fatigue compared to bar-fed machined bushings.

• Flanged stop design – The flange gives you a positive depth stop during installation. No guesswork, no measuring each cavity—just press to the face and you’re done.

• Controlled bore finish – We hold the internal diameter to a consistent finish and tolerance, so your locating pin slides or presses in with predictable feel, batch after batch.

• Through-hole versatility – The hollow center accepts standard dowel pins and also allows for optional through-coolant or ejector pin applications if your fixture needs it.

• Hardness matched to use – Surface hardened for wear resistance, core left tougher to withstand repeated press-fit and removal cycles without cracking.

Wide Usage:

• Flanged Hollow Dowel Bushing for automotive welding fixtures – Used as a replaceable wear sleeve for locating pins in body-in-white assembly lines, where high cycle counts quickly wear out unhardened bores.

• Machine tool pallet systems – Provides a hardened, accurate locating point that can be replaced when worn, saving the expensive pallet plate from being scrapped or re-machined.

• Mold base alignment – Fits into mold plates to guide ejector pins or return pins, with the flange keeping it from being pushed through under injection pressure.

• Aerospace drilling jigs – Protects the master tool plate from bushing wear when drilling composite or aluminum stacks, especially where hole position tolerances are tight.

• Heavy equipment assembly – Used in large structural fixtures where locating pins are frequently removed and reinserted—the bushing takes the wear, not the fixture base.