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Manufacturing services
CNC turning and milling · From 1 part
Couplings, connectors, bushings, bolts, special fasteners and threaded turned parts in 12L14 steel, machined from your file. Upload your CAD and order online, starting at a single part.
Pipe coupling
12L14 Steel · Ø28 × 38 mm · ½" NPT female thread on both ends · CNC turned
1 pc
$73.31 USD
per part
25 pcs
$12.47 USD
per part
-82.99%100 pcs
$10.35 USD
per part
-85.88%12L14 steel (UNS G12144, ASTM A108) is a free-machining carbon steel with sulfur and lead. The lead makes chips come out short and break on their own, so parts come off with a good finish and clean threads. It is ideal for turned parts with lots of threads: couplings, connectors, bushings, bolts and special fasteners. At PREMSA we machine it with CNC turning and CNC milling from your file, starting at a single part with an instant price.
Engineering-grade properties of Steel 12L14, focused on machinability, surface finish, and production efficiency. This material is widely used in precision machining environments where cycle time and consistency are critical.
Material Type
Free-machining carbon steel with sulfur and lead
Primary Characteristics
Short chips that break on their own, good surface finish, clean threads
Tensile Strength (Ultimate)
540 MPa (78 ksi), cold drawn
Tensile Strength (Yield)
415 MPa (60 ksi), cold drawn
Elongation at Break
10%, cold drawn
Brinell Hardness
160–190 HB, cold drawn
Density
7.87 g/cm³ (0.284 lb/in³)
Elastic Modulus
29,000 ksi (200 GPa)
Poisson’s Ratio
0.29
Thermal Conductivity
51 W/m·K
Coefficient of Thermal Expansion
11.7 µm/m·°C
Machinability
Excellent: chips come out short, break on their own and the part comes off with a good finish
Weldability
Not recommended: lead causes weld porosity and toxic fumes
Formability
Limited
Corrosion Resistance
Low: it rusts; protected with zinc plating, nickel plating or black oxide
Heat Treatment
Not through hardened; it can be carburized or carbonitrided for a hard case
Common Forms
Cold drawn round, hex and square bar
Typical Applications
Couplings, connectors, bushings, bolts, special fasteners, threaded turned parts
Material Composition
Carbon 0.15% max, manganese 0.85–1.15%, phosphorus 0.04–0.09%, sulfur 0.26–0.35%, lead 0.15–0.35%, balance iron
ASTM Standard
ASTM A108 (cold drawn bar)
Rating across key engineering and manufacturing criteria.
Strength
Weight
Machinability
Weldability
Formability
Corrosion Resistance
Thermal Resistance
Cost Efficiency
Upload your CAD file and get an instant price and delivery date. CNC turning and milling from one part to production.
We CNC turn and mill 12L14 steel parts with lots of threads and a good finish.
Couplings
Connectors and adapters
Bushings
Bolts and pins
Special fasteners
Nipples and plugs
Spacers
Threaded turned parts
Custom 12L14 parts
What people ask most about 12L14 steel parts: what it is, what it is used for, composition, hardness, hardening, equivalents, welding, rust, lead, price and tolerances.
12L14 steel is chosen for turned parts with lots of threads and a good finish that won’t be welded: couplings, connectors, bushings, bolts and special fasteners.
At PREMSA Industries we machine 12L14 with CNC turning and milling from your file, from a prototype to production.
12L14 is chosen when the part needs a good finish and lots of threads and won’t carry high loads.
If your drawing doesn’t specify tolerances, we machine to ISO 2768-m (medium). On dimensions you call out —diameters, threads, holes and fits— we can hold ±0.025 mm (±0.001 in), and critical dimensions are checked in inspection.
12L14 is machined with CNC turning, CNC milling, drilling and tapping.
12L14 rusts, so it almost always gets a coating.
Because it machines easily and leaves clean threads, 12L14 is used in many parts made with CNC machining.
12L14 is usually the right choice when the part has lots of threads and won’t be welded.