45# Carbon Steel Positioning Block

Solid-Blank CNC Milling for Repeatable Fixture Location

The carbon steel positioning block provides a fixed mechanical reference for machining jigs, assembly stations and inspection fixtures. Yijiang machines the part from a single 45# steel blank, forming the central locating bore, threaded mounting holes and datum surfaces within one coordinated setup. This one-piece construction removes assembly joints that could shift under clamping force and helps each block return to the same position during repeated loading cycles.

Multi-axis CNC milling controls bore location, hole spacing, flatness and perpendicular relationships across the part. The machining plan also considers tool access, edge condition and thread depth, allowing the block to fit existing fixture layouts without extensive adjustment. For recurring small batches, the same datum strategy and inspection points support consistent replacement parts across separate production runs.

Black Oxide Finish and Drawing-Based Inspection

After machining, black oxide treatment creates a low-build protective finish that reduces surface rust during storage and daily workshop use. Because the coating adds little dimensional thickness, it suits locating parts with controlled fits and threaded features. Critical bores, reference faces and threads can be checked after treatment to confirm that the finished component matches the approved drawing.

Inspection may cover locating-bore diameter, mounting-hole position, flatness, perpendicularity and thread fit. Batch sampling or full inspection can be arranged according to the tolerance plan and order volume. Material processing, CNC machining, surface treatment and final checks remain connected within one production flow.

Core Advantages & Common Applications

Core Advantages

• High Batch Dimensional Consistency: CNC cutting from whole steel blanks keeps uniform size of locating holes and mounting holes for all pieces in a batch, avoiding assembly deviation during mass fixture setup.
• Anti-Rust Black Oxide Surface: Black oxide treatment forms a protective layer on steel surface, effectively preventing rust during storage and workshop use, extending service life.
• Balanced Hardness & Structural Rigidity: 45# carbon steel material has proper hardness after processing, resisting surface dent and deformation under clamping pressure for long-term repeated positioning.
• Integrated One-Block Machining: Central locating cavity, fixing threaded holes and assembly reference planes are completed in one machining process without secondary assembly steps.
• Flexible Small-Batch Production Flow: Optimized production schedule adapts to recurring small-lot orders, balancing fast delivery and controlled processing costs.

Common Applications

Before release, each carbon steel positioning block can be compared with the drawing and inspection record. Custom bore sizes, hole patterns, step heights and thread specifications allow the component to match new tooling or replace an existing locator with less on-site rework.

Specification Table