Precision ground shaft H6 tolerance

Description

1. Product Overview

The Precision Ground Shaft with H6 tolerance is a high-accuracy, ready-to-install mechanical component manufactured through centerless grinding to achieve micron-level dimensional consistency. It is primarily used in linear motion systems, hydraulic pistons, and rotating assemblies across automation, medical devices, and precision machinery. The key value proposition is the elimination of post-machining while guaranteeing ISO 286-1 H6 fit tolerances, reducing assembly time and improving system reliability. Strategically, this product enables global buyers to standardize shafting procurement, lower quality risk, and accelerate time-to-market for capital equipment manufacturing.

2. Key Specifications & Technical Characteristics

• Material composition: Bearing-quality steel (e.g., AISI 52100, SUJ2, or equivalent induction-hardened carbon steel); chromium alloy content 1.30–1.60% Cr, 0.95–1.10% C

• Hardness grade: Surface hardness 60–64 HRC, case depth 1.5–3.0 mm; core hardness 25–35 HRC

• Tolerance class: ISO H6 (e.g., for 20 mm diameter: 0 to +13 µm deviation)

• Surface finish: Ra ≤ 0.2 µm, centerless ground and polished

• Straightness: ≤ 0.05 mm per 300 mm length

• Diameter range: 6 mm – 80 mm (custom up to 120 mm)

• Length range: 50 mm – 3,000 mm (bar form or cut-to-length)

• Packaging options: VCI-coated paper wrap + individual plastic sleeve + wooden crates (export-grade); anti-rust oil optional

• Shelf life: 24 months in unopened, low-humidity (<60% RH) storage

3. Core Industrial Applications

• Linear motion systems (rail guides, ball bushings): H6 tolerance ensures slip fit without play, reducing vibration in CNC routers and pick-and-place machines → outperforms turned shafts by 40% longer guide life.

• Hydraulic and pneumatic piston rods: Smooth ground surface minimizes seal wear; case hardness resists scoring under cyclic loading → lower maintenance intervals vs. chromed only shafts.

• Printing and packaging equipment: Consistent diameter across long lengths enables multi-bearing alignment without shimming → reduces setup time by 30%.

• Medical device actuators (surgical robots, patient lifts): H6 precision provides quiet, low-friction operation required in cleanroom environments → superior to h9 or h11 alternatives that cause chatter.

Cost advantage: Direct substitute for machined-and-ground shafts — eliminates 2–3 hours of secondary grinding per meter.

4. Competitive Advantages

• Quality consistency: 100% laser micrometer inspection per batch; Cpk ≥ 1.33 on diameter and roundness.

• Supply reliability: Three ISO 9001:2025-certified production lines with 5,000 m/month safety stock available for airfreight.

• Logistics capability: Door-to-door delivery to 47 countries via bonded warehouses in Rotterdam, Singapore, and Houston.

• Price competitiveness: 12–18% lower total landed cost than European incumbents due to optimized billet sourcing and in-line heat treatment.

• Sustainability: 94% steel scrap recyclability; no hexavalent chromium in anti-rust treatment; compliant with EU RoHS and REACH.

• Technical support: Full dimensional certification (FAIR), 2D/3D CAD models, and application engineering consultation included.

5. Commercial & Supply Information

• Minimum order quantity (MOQ): 500 meters (mixed diameters allowed) for standard stock lengths; 100 meters for repeat orders

• Bulk (20 MT) loading capacity: Approx. 12,000–14,000 meters of 20 mm diameter shafting per 20-ft container (actual depends on length mix)

• Loading per 40-ft HQ container: Up to 25 MT or 18,000–20,000 meters of comparable profile

• Lead time: 15 days ex-works for MOQ; 30 days for full 20 MT bulk

• Payment terms: LC at sight or net 30 days for qualified corporate accounts (credit check required)