HomeMachining Materials Guide

Machining Materials Guide

Type General Characteristics Alloy Common Applications Tolerances for a 1/2" Dia. Bar Material Cost Factor Machining Cost Factor
Aluminum Designed for machining 2011 Electronic hardware, endless commercial products Cold finish +/-.0015 3.8 .6
Improved strength, high fatigue and cracking resistance 2024 Electronic hardware, aircraft components, automotive parts, structural applications +/-.0015 5.8 .7
Good formability, weldability, and corrosion resistance 6061 Electronic hardware, recreation equipment, piping, aircraft components Cold finish +/-.0015
Extruded +/-.009
1.9 .8
Higher strength 7075 Aircraft components +/-.0015 6 .9
Brass Strength, corrosion and wear resistance, and excellent machinability C35300 Well suited for parts with knurling or threading +0015 3.5 .7
Low cost, low strength, heavy, free machining C36000 Electronic hardware and contacts, fittings, and numerous commercial products +/-.0015 3.4 (High scrap return provides cost savings ) .6
Copper High corrosion resistance, conductivity, and finish C11000 Transformers, electrical contacts, fittings +0015 3.4 3
Excellent electrical conductivity TeCu C14500 Electrical contacts +/-.0015 4.1 .8
Non-magnetic and has a very low permeability BeCu C17200 Magnetic housings, Electrical contacts, Bushings, Bearings, Pump components +.0015 21.6 3
Excellent electrical conductivity and the strength BeCu C17300 Marine environments, Electrical contacts, Fasteners, Valve components, Pump components +.002 21.6 1
Excellent electrical conductivity and the strength BeCu C17500 Marine environments, Electrical contacts, Fasteners, Valve components, Pump components +.002 21.6 1.5
Plastics Similar to nylon, better machinability Acetal Insulators, bearings, gears, bushings Ground 4.4 .7
Similar to nylon, better machinability Delrin Insulators, bearings, gears, bushings +/-.02 4.8 .7
Good machining, high friction resistance Nylon, extruded Insulator, bearing, short runs of products that will be converted to injection molding Ground +/-.002 6.7 .8
High strength plastic resin, extremely high resistance to heat, moisture, and chemicals PEEK Bearings, Bushings, Pump components, Medical implants, Aerospace components +0.004-0 71.6 .9
High impact strength and durability, resistance to frictional wear, weathering, flame, heat, chemical, and radiation PTFE and Teflon Insulators, Bearings, Spacers, Valve components, low moisture absorption rate, making it suitable for use in wet environments +0.005-0 12.1 1.2
Low cost, lightweight plastic PVC Insulators, fittings, bushings, pump, and valve components Ground +/-.003 32.8 6
One of the highest dielectric strengths of any thermoplastic ULTEM Aerospace and electronics components +.002-000 16.5 .7
Extremely high resistance to wear and abrasion, resistant to most corrosive materials UHMW Bushings, Bearings, Sprockets +0.005-0 5 .7
Stainless Steel Designed for machining, non-magnetic 303 Electronic hardware, automotive, aerospace, medical instruments, and many applications requiring corrosion resistance Cold finished +/- .002 1.9 2.7
Better weldability and formability, slightly more corrosion resistant 304 Applications needing formability or weldability Cold finished +/-.002 1.8 5
Better corrosion resistance 316 Medical implants and surgical instruments, aerospace Cold finished +/-.002 2.3 6.3
Corrosion resistance and high electrical resistivity 430 FR Excellent corrosion resistance in fresh water, gaseous, moderately acidic, and low chlorine environments +.002 3 2.7
High carbon, can harden to RC 60 440 Applications requiring stainless steel with highest hardness +.002 3.1 6.3
Excellent corrosion resistance and heat treatable 17-4 PH Medical, aerospace, applications needing corrosion resistance and hardness +/-.002 3.5 5
Special Alloy High magnetic permeability and highest saturation flux density Carp 49 Electronic components Instruments Communications devices + .002 -- 6
High heat resistance Greek Ascoloy Aircraft / Aerospace components + .002 7.1 4
Resistance to pitting, stress, oxidation, chemicals, acids, and saltwater Hastelloy Oilfield parts, pipes, valve components + .002 17.2 10
Maximum electromagnetic permeability and minimum hysteresis loss Hymu 80 Electrical components MRI equipment + .002 32.3 10
Stress cracking, chloride pitting, seawater, and gall resistances Nitronic 60 Bushings, shafts, pins, pump and valve components MRI equipment + .002 5.8 9
Steel Moderate strength and low-stress applications. 1008 Good matte surface finish that makes it suitable for exposed parts + .002 1.2 3.5
Plain low carbon steel, poor machinability but good formability and weldability. Case harden only 1018 Rivets and parts requiring strong welds Cold drawn 0 0.9 2.4
Strength, impact resistance and higher tensile strength. 1045 Responds to heat treatment extremely well, but it not recommended for case hardening + .003 0.9 3
Higher carbon, higher strength, direct hardening 1137 Higher stress applications, gears, shafts, studs, etc. Cold drawn 0 1.6 2.7
Strength and machinability 11L37 Easily machined and can be annealed, quenched, tempered, and heat treated + .003 5.1 2.2
Strength and hardness and a more uniform surface hardness 11L41 Axles, shafts, bolts, and pins + .003 2.5 2.3
Designed for excellent machinability. Case hard only 12L14 Endless commercial products; probably more pounds used in turned products than any other bar stock Cold drawn 0 1 1
Designed for good machinability. Case harden only 1215 Parts needing better formability or weldability than 12L14 Cold drawn 0 1 1.2
Strength, toughness, and fatigue resistance 4130 Military and commercial aircraft parts Norm AQ HT Condition F4 1.5
Popular general-purpose alloy. Direct hardening 4140 or 4142 Gears, shafts, pins, bolts and nuts, pump and valve components Cold drawn 0 1.1 2.9
Designed for better machining w/lead additive; direct hardening 41L40 Couplings, shafts, tooling, bolts Cold drawn 0 2.5 2.8
.55% Ni, .50% Cr, .20% Mo, heat treatable and case hardening 8620 Shafts, bushings, pins, gears, bolts Cold drawn 0 2.5 2.9
Very high 1% carbon, .25% Ni,1.4% Cr, .08% Mo 52100 Bearing applications Cold drawn Spheroidize annealed +/- .006 1.8 4.8
High strength, light weight Ti-6Al-4V Aircraft and aerospace parts Ground & polished +/-.002 21.3 6
High strength, light weight, good bio-compatibility Ti-6Al-4VEli Medical implants Ground & polished +/-.002 30.2 6