Brass Bar / Brass Hex Bar / Brass Round Bars

Product Description

Technical Guide: Brass Bar Form Factors & Specification Standards

In industrial manufacturing, precision component engineering, and repeating screw machine operations, Brass (Copper-Zinc alloys) serves as the reference material family for high machinability, structural integrity, and exceptional electrical and thermal conductivity.

When sourcing brass profiles, the geometry of the cross-section—whether Round, Hexagonal, or Flat/Square—directly governs its manufacturing route, structural orientation, and downstream processing compatibility.

Core Structural Metallurgy: The Industry Standard

The benchmark grade for bar products across North America is C36000 (Alloy 360 / Free-Cutting Brass) governed by ASTM B16. In European contexts, it cross-references to CW614N (CuZn39Pb3) or CW603N under EN 12164.

• Chemical Structure: Nominally consisting of 61.5% Copper (Cu), 35.4% Zinc (Zn), and an intentional 2.5% to 3.7% Lead (Pb) addition.

• The Lead Phenomenon: Lead remains elemental and completely insoluble within the alpha/beta brass crystalline matrix. It disperses as micro-globules throughout the microstructure, acting as localized chip-breakers that reduce cutting friction, minimize tool wear, and allow for high-speed automated machining without continuous, bird-nesting chip ribbons.

• Mechanical Baselines (H02 Half-Hard Temper):

  • Tensile Strength: 340 to 470 MPa (55,000–58,000 PSI)

  • Yield Strength: 125 to 310 MPa (25,000–45,000 PSI)

  • Elongation: ~25%

  • Machinability Index:100% (The baseline standard against which all other metals are measured).

Form Factor Variations

1. Brass Round Bars

Produced primarily through extrusion followed by cold drawing to size, round bars display continuous, balanced radial stresses and highly consistent longitudinal grain boundaries.

• Engineering Profiles & Finishes: Commonly delivered in Centerless Ground (CG) or Bright Drawn (BD) states, carrying tight precision dimensional tolerances such as h8, h9, or h11.

• Primary Engineering Uses: Ideal for high-speed automated CNC lathe work, precision screw machine products, pump shafts, valve stems, electrical pins, and concentric hardware components.

2. Brass Hex (Hexagonal) Bars

Hexagonal geometries are formed by drawing raw wire or extruded billets through specialized six-sided tungsten carbide dies. Sizing is universally determined by the Distance Across the Flats (A/F).

• Engineering Profiles & Finishes: Supplied primarily in an Unpolished Mill Finish with a cold-drawn temper to preserve the integrity of the sharp 60° corners.

• Primary Engineering Uses: Designed specifically to bypass secondary multi-axis milling operations. Ideal for high-pressure fluid fittings, hydraulic adapters, hex nuts, threaded standoffs, bushings, and fasteners that require flat parallel faces for structural wrench-gripping torque.

3. Brass Flat & Square Bars

Flat and rectangular configurations are either extruded directly or precision sheared and edge-conditioned from heavy plates.

• Engineering Profiles & Finishes: Showcases distinct structural orientation (mechanical anisotropy) where transverse ductility differs from longitudinal strength. Commonly delivered in mill or hot-rolled finishes.

• Primary Engineering Uses: Base plates, electrical busbars, structural brackets, linear guide rails, and decorative architectural trim components requiring flat mating planes.

Featured Brass Bar Products

The following selection highlights the standard size envelopes, tempers, and international specifications available for procurement:

Brass Round Bars

360 Brass Round Bar - 1.5" OD is a heavy-gauge cylindrical bar engineered for demanding industrial turn-work.

• Material Specification: C36000 / ASTM B16

• Dimensions: 1.5-inch Diameter x 12-inch Length

• Temper / Finish: H02 Half-Hard Temper; Unpolished Mill Finish

• Best Used For: Heavy-duty valve stems, machined bushings, and pump shafts.

• 360 Brass Round Bar - 0.125" OD is a precision, small-diameter rod optimized for miniature parts production.

  • Material Specification: C36000 / ASTM B16

  • Dimensions: 1/8-inch (0.125") Diameter x 48-inch Length

  • Temper / Finish: H02 Half-Hard Temper; Cold Finished Clean Surface

  • Best Used For: Electrical pins, miniature connectors, and precise model hardware.

  Brass Hex Bars

  C360 Brass Hexagon Bar - 2.0" A/F provides a massive cross-section for high-torque fitting fabrication.

  • Material Specification: C36000 / ASTM B16

  • Dimensions: 2.000-inch Across Flats (A/F)

  • Temper / Finish: H02 Temper; Mill Finish with highly accurate profile corners

  • Best Used For: Large fluid connectors, heavy hex nuts, and high-pressure manifold plugs.

  360 Brass Hex Bar - 0.5" A/F is a mid-range hex profile engineered specifically for fluid power lines.

  • Material Specification: C36000 / ASTM B16

  • Dimensions: 0.500-inch Across Flats x 12-inch Length

  • Temper / Finish: Extruded H02 Temper; Ready for immediate tool contact

  • Best Used For: Standard plumbing adapters, hydraulic fittings, and electronic standoff columns.

  Material Comparison: Structural Behavior Across Profiles

  The mechanical focus and application limitations shift significantly depending on the geometry selected:

  Performance Attribute	Round Bars	Hexagonal Bars	Flat / Square Bars
  Symmetry of Stress	Symmetrical uniform radial stress	Variable stress profile at 60° apexes	Linear planar stress across 90° corners
  Wrench/Tooling Interface	Requires jaw chucks or collets	Native compatibility with open-ended/socket tools	Ideal for flat clamping blocks
  Material Yield on Turn	Low volumetric scrap loss	Higher initial chip volume when turning down	High machining volume required for round turning
  Typical ISO Tolerance	Tight (h8 to h11 standard)	Moderate (h11 typical)	Wider dimensional boundaries