China Custom Machined 1045 Machinery Parts as Per Drawing
Precision CNC machined AISI 1045 carbon steel parts, manufactured strictly as customer drawings.
OEM custom 1045 steel machining components, available for turning, milling, drilling and related precision processes.
We custom machine a wide range of 1045 / 45# steel machinery parts according to customer drawings, CAD / STEP files, or supplied samples — from a single prototype piece to repeated large-volume OEM production batches. AISI 1045 steel, commonly written as 45# steel across the Chinese machining supply chain and close to C45 / CK45 / S45C in other regional standards, is a medium-carbon engineering steel valued for its balanced strength, dependable machinability and predictable heat-treatment response. It is one of the most frequently specified materials for shafts, flanges, blocks, brackets, sleeves, gear blanks and general 1045 steel mechanical components.
Whether a drawing names them CNC machined AISI 1045 steel parts custom per drawing, precision machined 1045 carbon steel components, or custom 1045 steel machining parts according to drawings, every component is produced to the dimensions, tolerances, threads, fits and surface finish marked on the drawing. Alongside AISI 1045 and 45# steel, we also machine AISI 1018, AISI 1020, AISI 1040, AISI 1050 and 4140 alloy steel whenever the drawing calls for an alternative grade. As a custom 45# steel machine parts manufacturer, this custom machining service for 45 carbon steel covers 45# steel turned & milled mechanical parts as well as OEM 45# steel machined spare parts for both equipment replacement and series production.
AISI 1045 / 45# Steel: Material Characteristics and Machining Performance
AISI 1045 is a medium-carbon engineering steel with roughly 0.42–0.50% carbon and 0.60–0.90% manganese. In the normalized or hot-rolled condition it typically offers a tensile strength around 565–700 MPa and a yield strength near 310–350 MPa, with Brinell hardness commonly in the 163–197 HB range. These properties explain why precision machining service for 1045 steel is requested so often for load-carrying machine components.
Balanced Medium-Carbon Chemistry
The approximately 0.45% carbon content places 1045 between soft low-carbon grades (1018, 1020) and wear-resistant high-carbon grades. It carries more load than mild steel while remaining far easier to cut and weld than tool steel, which makes it a practical default for custom machined carbon steel parts.
Good, Predictable CNC Machinability
1045 steel machines cleanly on both CNC lathes and machining centers, with stable chip breaking, reasonable tool wear and good surface generation under carbide tooling. Its machinability is commonly rated near 65% of the free-machining reference (AISI 1212), supporting efficient production of AISI 1045 steel CNC turning parts and AISI 1045 steel CNC milling parts.
Strength Combined with Toughness
Precision machined 1045 carbon steel components combine tensile and yield strength with enough impact toughness to resist shock loading in shafts, pins, couplings and brackets. The material is less brittle than high-carbon steels, so machined 1045 parts behave reliably in power-transmission and structural assemblies.
Responsive to Heat Treatment
1045 responds well to normalizing, quenching and tempering, as well as induction or flame surface hardening. Induction-hardened journals, gear teeth and cam surfaces can reach roughly HRC 45–55 while the core stays tough, and finish grinding after treatment restores final accuracy.
Welding, Forging and Forming Behavior
The grade offers fair weldability with suitable preheat and low-hydrogen procedure, and it is readily forged and hot-worked into blanks before machining. Deep drawing and cold forming are not its main use — those jobs normally go to mild low-carbon steel — but custom fabrication 1045 steel parts from bar, plate and forgings are routine.
Readily Available and Cost-Effective
1045 / 45# steel is stocked around the year as round bar, flat bar, square bar, plate and solid block in a broad range of sizes. Stable material availability, moderate raw-material cost and fast cutting cycles together keep 1045 steel machined spare parts economical for both single pieces and long OEM runs.
Selected Custom Machined 1045 / 45# Steel Products
A small selection of machined steel parts OEM per drawing — flanges, gears, hydraulic blocks, spline shafts, thread couplings and guide-rail components. Each item below is produced from customer drawings or samples rather than from a fixed catalog.
1045 / 45# Steel Parts We Machine as Per Drawing
The list below covers the part families most often produced from AISI 1045 and 45 carbon steel. CNC machined 1045 steel part names can be mixed freely on one drawing — for example a stepped shaft with a milled keyway, turned threads and a ground bearing journal — and mixed batches of different custom 1045 steel machining parts according to drawings are equally workable.
Shafts
CNC turned from 1045 round bar; steps, keyways, center holes, ring grooves and threads can be finished in a single setup where the geometry allows.
- 45# steel shaft / AISI 1045 steel shaft
- CNC turned 45# steel shaft
- Step shaft 45# steel
- Spline shaft, gear shaft
- Motor shaft, worm shaft
- Pin shaft / pivot shaft
- Long shaft, hollow shaft
Flanges and Discs
Faced, bored and drilled to the drawing: bolt-hole circles, counterbores, seal grooves and locating spigots match the mating assembly exactly.
- 45# steel flange / machined steel flange
- Connection flange, blind flange
- Flange plate / flange disc
- End disc, rotary disc
- Mounting disc, coupling disc
- Custom turned 45# steel flange plate
Blocks, Valve Blocks and Base Plates
Multi-face CNC milling with cross-drilled galleries, tapped holes, dowel holes and ground mounting faces for hydraulic systems and fixturing.
- 45# steel block / machined steel block
- Hydraulic block / manifold block
- Mounting block, fixed block
- Support block, valve plate
- Base plate, cover plate
- Guide rail block
Brackets and Supports
Milled from 1045 plate or solid block, with square locating faces, slotted mounting holes and controlled perpendicularity for equipment frames.
- 45# steel bracket
- Machined support bracket
- Mount bracket, L bracket
- Angle bracket, clamping bracket
- Bearing support / bearing pedestal
- OEM machined 45 carbon steel bracket
Sleeves, Spacers and Bushings
Turned and bored to close bore / OD fits with squared faces for accurate stack-up; bores and outer diameters can be ground after heat treatment.
- 45# steel sleeve
- Steel bushing / bushing sleeve
- Spacer / spacer sleeve
- Thrust spacer, wear sleeve
- Locating sleeve, distance ring
- Shaft collar
Gears and Gear Blanks
Machined gear blanks with bored hubs, keyways and tooth preparation, ready for hobbing or shaping; hardening and finish grinding can follow.
- 45# steel gear / machined gear
- Gear blank, gear wheel
- Spur gear, bevel gear
- Worm gear, worm shaft
- Gear shaft, pinion blank
- AISI 1045 spline shaft machining
Pins, Couplings and Connecting Parts
Turned, threaded and milled connecting elements with controlled diameters and gauged threads for assembly and power transmission.
- 45# steel pin, dowel pin
- Cylindrical pin, taper pin
- Connecting rod
- Coupling / thread coupling NPT
- Connector, joint, adapter
- Clevis, joint head
Housings and Other Structural Parts
Complex 3D geometries milled from solid 1045 stock, plate or forgings on 3-axis and 4-axis machining centers for machinery and automation equipment.
- Machined steel housing
- Steel cam, steel roller
- Pressing plate, wedge, seat
- Adapter, transition piece
- Guide rail block, slider block
- 45# steel machined structural parts
Machining and Inspection Capabilities for 1045 Steel Parts
Custom 45# steel machining parts per drawing move through CNC turning and CNC milling first, with drilling, tapping, reaming, boring, counterboring and grinding added as the drawing requires — in other words, 45# steel turned parts, 45# steel milled components and 45# steel drilled parts are all handled in one continuous workflow. Finished machined 45# steel mechanical components are then checked against drawing dimensions before packing.
CNC Milling Service
3-axis and 4-axis CNC milling of 45# steel blocks, base plates, brackets, housings and guide-rail parts — face milling, pocketing, slotting, contour milling and multi-face setups for custom CNC machined 1045 steel components and 45# steel CNC milling components of every regular geometry.
CNC Turning Service
CNC turning of AISI 1045 steel shafts, sleeves, flanges, discs, pins and couplings: OD and ID turning, facing, grooving, parting, knurling and metric / unified / NPT thread cutting for 45# steel CNC turning parts.
2D Profile Projector Measuring
Non-contact profile inspection of radii, chamfers, angles, thread forms and small complex contours on turned and milled 1045 steel machined spare parts, especially where calipers cannot reach the feature reliably.
CMM Testing
Coordinate measuring of position, true position, concentricity, coaxiality, perpendicularity, parallelism and distance dimensions, so precision machined 1045 carbon steel components match the drawing's geometric tolerance frame.
Achievable Dimensional Accuracy and Surface Quality on Machined 1045 Parts
The values below describe typical, repeatable results for precision machining 45# steel OEM parts; the drawing always governs, and tighter figures can be discussed feature by feature. Accuracy depends on part geometry, the stock condition, machine setup and whether finish grinding follows heat treatment.
TOLERANCEDimensional Tolerance Grades
Routine CNC turning and milling of custom machined carbon steel parts holds IT7–IT8 without difficulty on general dimensions. Critical bores and shaft journals are commonly kept at IT6–IT7, and finish cylindrical or surface grinding after hardening can bring 1045 features into the IT5–IT6 range.
GEOMETRYForm and Position Accuracy
Concentricity and circular runout between turned diameters are typically controlled within 0.01–0.02 mm; parallelism and perpendicularity of milled mounting faces within about 0.02 mm per 100 mm; flatness is refined by finish milling or surface grinding of 45# steel machined structural parts.
ROUGHNESSSurface Roughness Range
General as-machined surfaces of 1045 steel mechanical components reach Ra 3.2; precision turned or milled mating faces regularly reach Ra 1.6; ground journals and bores reach Ra 0.8 and finer; polishing or fine turning can be specified for visible or sealing surfaces.
FITS / THREADSFits, Bores and Threads
Common clearance and transition fits such as H7/g6 and H7/k6 are produced routinely on machined steel shafts and bores. Metric threads, unified UNC / UNF threads and tapered NPT threads are cut or tapped and checked with matching gauges; reamed and ground bores keep controlled cylindricity.
Surface Treatment and Finish Options for 1045 / 45# Steel Machined Parts
Bare machined 1045 steel needs protection against corrosion, and many drawings also call for wear-resistant or cosmetic finishes. The following treatments are regularly arranged for custom 1045 steel machining parts according to drawings; machined mating faces, threads and locating datums can be masked when required.
Black Oxide (Blackening)
A thin chemical conversion coating with almost no dimensional change, usually sealed with anti-rust oil. A common, economical finish for 45# steel shafts, pins, spacers and internal 1045 steel machined spare parts.
Zinc Plating
Electro-galvanizing with clear / blue or colored / yellow passivation for indoor corrosion protection on brackets, plates, connectors and 45 carbon steel fabricated parts; threaded areas are dimensioned to leave plating allowance.
Nickel Plating
Electrolytic or electroless nickel plating gives even coverage on complex milled 1045 geometries, improving wear and corrosion resistance of hydraulic blocks, connectors and custom CNC machined 1045 components with recessed features.
Phosphating
Manganese or zinc phosphate coatings create an oil-retaining surface for moving and mating parts such as 45# steel gears, sleeves and bushings, supporting run-in behavior and reducing scuffing on sliding surfaces.
Hard Chrome Plating
Hard chromium builds a wear-resistant layer on 1045 shafts and rollers; the plated surface is then finish-ground to restore diameter accuracy and the required Ra value on bearing or sealing journals.
Painting and Powder Coating
Anti-rust primer, wet spray enamel or powder coating for housings, brackets, base plates and structural parts, with precision machined mating faces and threaded holes masked to keep assembly dimensions intact.
Polishing and Brushing
Fine turning, abrasive-belt polishing or directional brushing for visible surfaces. Every machined 1045 / 45# steel part is deburred, with sharp edges broken, unless the drawing explicitly asks for a sharp edge.
Heat Treatment and Hardening
Normalizing, quenching and tempering (Q+T), induction hardening, flame hardening, carburizing or nitriding lift the hardness and wear life of 1045 gear teeth, shaft journals and cam profiles, followed by finish machining to final size.
From a Single Machined Piece to Large-Volume Production
The same drawing-to-part workflow supports maintenance spares and series production alike. Custom 45# steel machine parts are quoted and produced at the quantity the project actually needs, with no fixed minimum order quantity for standard machined components.
Single Piece and Prototypes
One-off CNC machined 1045 steel parts from a drawing or a worn sample, including design-verification prototypes, equipment repair spares and obsolete-part replacement where only the physical component remains.
Small Trial Batches
Roughly 10–500 piece pre-production and trial runs of 45# steel turned and milled mechanical parts, with first-article confirmation before any larger release so drawing issues are caught early.
Medium Repeat Batches
Scheduled repeat OEM orders produced with stable fixturing, fixed tooling lists and repeatable inspection routines, keeping every delivery of machined steel parts OEM per drawing consistent with the first approved batch.
Large-Volume Production
High-volume CNC turning and milling campaigns with optimized cycle times, batch-level traceability and uniform quality across thousands of 1045 steel machined spare parts, suited to machinery builders and assembly lines.
Companion Materials Machined Alongside AISI 1045 / 45# Steel
When a drawing specifies a neighboring carbon grade or an alloy steel instead of 1045, the same CNC turning, milling, drilling and grinding workflow applies. 45# steel is the common Chinese designation for the 0.45% carbon grade family, and drawings marked C45, CK45 or S45C describe the equivalent material and are machined in the same way.
AISI 1018
Low-carbon mild steel that is easy to machine, weld and form; used for lightly loaded plates, welded structures and simple custom machined carbon steel parts where high strength is not required.
AISI 1020
General-purpose low-carbon steel for carburized soft-core components, simple turned parts and welded machine structures; often selected when surface hardness matters but the core must stay tough.
AISI 1040
A medium-carbon grade sitting between 1020 and 1045, offering moderate strength with slightly easier cutting; a practical alternative for lightly stressed 1045-style shafts and sleeves.
AISI 1045 / 45# Steel
The default medium-carbon engineering steel for shafts, flanges, blocks, brackets, gear blanks and load-carrying mechanical parts — the central material of this page and of most custom 1045 steel machining orders.
AISI 1050
A higher-carbon grade for stronger, harder-wearing machined parts such as heavy pins, wear plates and spring-type components, with heat treatment response stronger again than 1045.
4140 Alloy Steel
Chromium-molybdenum alloy steel with deeper hardenability and higher strength for heavily loaded gears, axles, high-torque shafts and demanding structural components machined to the same drawing discipline.
Typical Custom CNC Machined 1045 / 45# Steel Part Combinations
The combinations below show how part name, material designation and machining process are put together on real drawings and orders — every item can be quoted as CNC machined 1045 steel, CNC machining 1045 steel, or custom CNC machined 1045 steel production, strictly according to the supplied drawing or sample.
Turned Shafts and Axles
- CNC machined 1045 steel step shaft
- CNC machined 45# steel step shaft
- 45# steel machined shaft, block, bracket
- CNC machining 1045 steel spline shaft
- Custom CNC machined 1045 gear shaft
- CNC turned 45# steel motor shaft
- AISI 1045 spline shaft machining
- CNC machined 45# steel pin shaft
- 45# steel turned and milled mechanical shaft
Flanges and Discs
- CNC machined 1045 steel flange plate
- Custom turned 45# steel connection flange
- CNC machining 1045 blind flange
- Custom CNC machined 1045 end disc
- CNC machined 45# steel rotary disc
- Precision machined 1045 carbon steel flange
Blocks, Manifolds and Plates
- Precision milled AISI 1045 hydraulic block
- CNC machined 1045 steel manifold block
- CNC machining 1045 mounting block
- Custom CNC machined 45# base plate
- CNC milled 1045 support block
- 45# steel drilled and tapped fixed block
Brackets and Supports
- OEM machined 45 carbon steel bracket
- CNC machined 1045 L bracket
- CNC machining 1045 angle bracket
- Custom CNC machined 1045 bearing support
- Precision milled 45# steel mount bracket
- Custom 45# steel machined support seat
Sleeves, Spacers and Gears
- CNC machined 1045 steel spacer sleeve
- CNC machining 1045 steel bushing
- Custom CNC machined 45# gear blank
- CNC machined 1045 spur gear
- Precision turned 45# steel worm shaft
- 45# steel turned thrust spacer
Pins, Couplings and Structural Parts
- CNC machined 1045 steel dowel pin
- CNC machining 1045 thread coupling
- Custom CNC machined 45# connecting rod
- CNC machined 1045 steel housing
- CNC milling 1045 guide rail block
- Custom CNC machined 45# steel adapter
Every component is built as per drawing: dimensions, tolerance grades, geometric tolerances, threads, fits, surface roughness and surface treatment all follow the drawing and the purchase specification. Where a drawing is incomplete, a supplied sample can be reverse-measured and a confirmation drawing prepared before metal is cut. Machined steel parts OEM per drawing, 1045 steel machined spare parts, 45# steel custom machined parts according to drawing and custom fabrication 1045 steel parts for general machinery, automation equipment, hydraulic systems, transmission assemblies and industrial equipment all fall within regular production scope — from one precision CNC machined AISI 1045 carbon steel part to repeated large-volume OEM batches.