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Carbon Steel Hex Bar Annealed 1-1/4" 4140 Cold Finish

$51.36 for 12"
Across Flats1-1/4"
MaterialCarbon Steel
Grade4140
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Quarter-inch increments. Min: 1", Max: 59"
0"24"48"72"59"
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Request a quote for cuts longer than 59" · Non-refundable · Tolerance: ±0.125"
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Description

Carbon Steel Hex Bar 4140 CF is a high-strength alloy steel bar known for its toughness, fatigue resistance, and wear resistance. It is commonly used in demanding applications such as in automotive, manufacturing, and aerospace industries, where high performance and durability are required. The cold-finished process provides a smooth surface and tighter tolerances, making it ideal for precision components, shafts, and machine parts.
Not enough in stock? Call us referencing part #4192. We only show partial inventory online.
ACROSS FLATS
Specifications
MaterialCarbon Steel
Grade/Alloy4140
ShapeHex Bar
Across Flats1.25 in
Max Length59 in
Weight4.33 lb/ft
MTRAvailable Upon Request
Characteristics
WeldabilityGood
MachiningGood
Bending/FormingFair
Wear ResistanceExcellent
CorrosionFair
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From the counter

About 4140 steel

4140 is chromoly, a chromium-molybdenum alloy steel that heat treats to high strength and toughness. It's the grade for parts that take serious load or shock: shafts, axles, gears, couplings, and tooling. You machine it in the annealed state, then harden and temper for the strength the part needs.

Read the full 1018 vs A36 vs 1045 steel guide
What is 4140 used for?
High-stress parts: shafts, axles, gears, and tooling that need strength and toughness beyond plain carbon steel. It's heat-treatable, so you machine it soft and harden it after.
Can you weld 4140?
It welds, but it's an alloy steel with real carbon, so preheat and post-weld heat treatment matter or the weld zone cracks. For loaded parts, plan the heat treatment around the joint or design it bolted.