When shopping for bronze round bars, prioritize material chemistry, dimensional accuracy, and finish quality to suit your machining needs. The top options below focus on silicon bronze (655) for good strength, corrosion resistance, and formability, along with bearing bronze (932) for high endurance applications. Each product is best for specific uses—engineered parts, bushings, or simple prototype bars. The following selections help you compare diameter options, lengths, and temper to match your project goals.
The table below summarizes five strong choices from OnlineMetals that align with common bronze applications. Use this as a quick reference to find the right size, then read the detailed product sections to confirm suitability for your process and tolerance requirements.
| Product | Diameter | Length | Material Type | Best For |
|---|---|---|---|---|
| OnlineMetals 655 Bronze Round Bar, 0.375″ x 12″ | 0.375″ | 12″ | 655 Bronze (Silicon Bronze) | Small precision components, springs, and mulch fittings |
| OnlineMetals 655 Bronze Round Bar, 0.3125″ x 12″ | 0.3125″ | 12″ | 655 Bronze (Silicon Bronze) | Miniature shafts, bushings, hobby projects |
| OnlineMetals 655 Bronze Round Bar, 0.5″ x 12″ | 0.5″ | 12″ | 655 Bronze (Silicon Bronze) | Medium-strength components, wear parts |
| OnlineMetals 655 Bronze Round Bar, 0.25″ x 24″ | 0.25″ | 24″ | 655 Bronze (Silicon Bronze) | Longer prototype runs, machining practice |
| OnlineMetals 932 Bronze Round Bar, 1″ x 12″ | 1″ | 12″ | 932 Bronze (Bearing Bronze) | Bearings, bushings, wear parts |
OnlineMetals 655 Bronze Round Bar, 0.375″ x 12″
Product name: OnlineMetals 655 Bronze Round Bar, Unpolished (Mill) Finish, H04 Temper, ASTM B98, 0.375″ Diameter, 12″ Length.
Best for: Small, precision components where silicon bronze’s formability and corrosion resistance are needed. This diameter is ideal for prototypes or small fittings that require stable dimensions.
Why selected: 655 bronze, commonly called silicon bronze, balances strength with good corrosion resistance and ease of forming. The H04 temper provides a predictable machinability for light to moderate-duty parts.
Limitations: The unpolished mill finish may require post-machining surface finishing for cosmetic or corrosion-control requirements. Not suitable for high-load bearing surfaces without proper design considerations.
OnlineMetals 655 Bronze Round Bar, 0.3125″ x 12″
Product name: OnlineMetals 655 Bronze Round Bar, Unpolished (Mill) Finish, H04 Temper, ASTM B98, 0.3125″ Diameter, 12″ Length.
Best for: Precision shanks and small shafts where size tightness matters. The 0.3125″ diameter fits close-tolerance components with minimal material waste.
Why selected: Silicon bronze’s combination of strength and corrosion resistance supports reliable small-part production, while the H04 temper keeps machinability consistent. The 12″ length accommodates standard drill or lathe setups.
Limitations: Slightly smaller rounds may require more setups for longer runs; ensure tooling can achieve the required finish on small-diameter bars.
OnlineMetals 655 Bronze Round Bar, 0.5″ x 12″
Product name: 655 Bronze Round Bar, Unpolished (Mill) Finish, H04 Temper, ASTM B98, 0.5″ Diameter, 12″ Length, OnlineMetals.
Best for: Medium-sized components, wear parts, and fixtures requiring better strength than smaller diameters allow.
Why selected: The 0.5″ diameter provides a versatile option for parts that balance machinability and stiffness. Silicon Bronze maintains good corrosion resistance for outdoor or damp environments.
Limitations: Slightly larger diameter may require more robust tooling and slower feed rates to preserve surface finish and dimensional accuracy.
OnlineMetals 655 Bronze Round Bar, 0.25″ x 24″
Product name: 655 Bronze Round Bar, Unpolished (Mill) Finish, H04 Temper, ASTM B98, 0.25″ Diameter, 24″ Length, OnlineMetals.
Best for: Long prototype runs or projects with extended bar lengths where a small diameter is sufficient for multiple parts. Useful for hobbyists and light manufacturing.
Why selected: The longer length supports batch production in a single cut. Silicon Bronze’s machinability aids in achieving consistent part thickness along the bar.
Limitations: Small diameter may intensify end-checking or tool wear if machining is aggressive; verify cutting parameters to minimize chatter.
OnlineMetals 932 Bronze Round Bar, 1″ x 12″
Product name: 932 Bronze Round Bar, Unpolished (Mill) Finish, As Cast, SAE 660, ASTM B505, 1″ Diameter, 12″ Length, OnlineMetals.
Best for: Bearings, bushings, and wear parts requiring higher strength and endurance. The bearing bronze family supports static and dynamic loads in mechanical assemblies.
Why selected: 932 bronze, also labeled Bearing Bronze, is designed for high endurance. The 1″ diameter provides ample material for robust parts and fits standard bearing housing tolerances.
Limitations: As-cast finish may necessitate post-machining or surface treatment to meet cosmetic or corrosion-control standards.
OnlineMetals 932 Bronze Round Bar, 1.25″ x 12″
Product name: 932 Bronze Round Bar, Unpolished (Mill) Finish, As Cast, SAE 660, ASTM B505, 1.25″ Diameter, 12″ Length, OnlineMetals.
Best for: Heavier-duty bushings or bearings and general purpose industrial bronze components with additional diameter for thicker walls or greater strength.
Why selected: The 1.25″ size expands options for larger bearing components. Bearing Bronze offers reliable performance in compact assemblies.
Limitations: Larger diameter requires more powerful tooling and longer cycle times; confirm available machines and clamping setup before ordering.
OnlineMetals 655 Bronze Round Bar, 0.3125″ x 36″
Product name: 655 Bronze Round Bar, Unpolished (Mill) Finish, H04 Temper, ASTM B98, 0.3125″ Diameter, 36″ Length, OnlineMetals.
Best for: Long-length components and continuous machining runs where a stable silicon bronze alloy is needed at mid-size diameter.
Why selected: The combination of 0.3125″ diameter with a longer 36″ length supports extended production or complex piecework, maintaining machinability and corrosion resistance.
Limitations: Longer bars can bow slightly if not properly supported; ensure proper stock handling to maintain straightness during cutting.
Buying Guide: Bronze Round Bar Essentials
- Material chemistry: Silicon bronze (655) offers good corrosion resistance and formability, ideal for small to mid-size parts. Bearing bronze (932) provides higher endurance for wear components.
- Diameter and length: Choose a size that minimizes waste and matches your tooling capabilities. Longer bars can reduce overall setup time for batch runs.
- Finish and temper: Unpolished mill finishes are common for machining, but some applications require post-processing. H04 temper supports machinability with stable properties.
- Applications: Use 655 for precision shafts, fittings, and non-load-bearing parts; use 932 for bushings, bearings, pumps, and wear parts requiring durability.
- Machining considerations: Verify tool material, feeds, and speeds for each diameter to avoid chatter, overheating, or surface defects.
FAQ
- What is the main difference between 655 and 932 bronze? 655 is silicon bronze with strong corrosion resistance and formability, suitable for precision parts. 932 is bearing bronze with higher endurance, better for wear components.
- Which diameter is best for small prototypes? A smaller diameter like 0.25″ to 0.3125″ is often best for rapid prototyping and low-cost trials.
- Is an unpolished finish acceptable for machined parts? Yes, unpolished mill finishes are common; post-machining finishing may be needed for appearance or corrosion control.
- When should I choose a longer bar length? If you plan multiple parts from the same stock, a longer length reduces waste and setup frequency.
- Are there cautions when using large-diameter bronze bars? Larger bars require suitable tooling, clamping, and machine power to maintain straightness and surface quality.
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