# Luoyang Songju Science and Technology Co., Ltd.

> Precision CNC machine tool components manufacturer since 2012. Electric spindles, linear guideways, ball screws, and precision bearings. ISO 9001:2015 certified. 22,000 m2 facility in Luoyang, China. 5,000+ units delivered in 2025 across 10+ countries.

## Core Products

- [Electric Spindles](https://www.luoyangsongju.com/products/electric-spindle): 27 models, 0.001mm runout, 0.5-100kW, up to 120,000 RPM. CNC machining, grinding, and turning spindles. Synchronous and asynchronous motors. BT/HSK/ISO tool interfaces.

- [Linear Guideways](https://www.luoyangsongju.com/products/linear-guideway): HJG-D family — HJG-DA and HJG-DB four-row ball guides, HJG-DZ roller guides. Grades P/H/SP, published rail range 15-65 mm. Catalog also lists selected larger rails.

- [Ball Screws](https://www.luoyangsongju.com/products/ball-screw): HJG-S, ground C3/C5 and rolled C7, diameter 8-100 mm, single and double nut, DIN 69051.

- [Precision Bearings](https://www.luoyangsongju.com/products/precision-bearings): P4/P2 ABEC-7/9 grade. Full range of precision bearing types for machine tool spindles and industrial automation.
  - [Angular Contact Ball Bearings](https://www.luoyangsongju.com/products/angular-contact-ball-bearings): 718, 719, 70, 72 series. 15deg & 25deg contact angle. 35-280mm bore. P5/P4/P2. Universal ground faces for DB/DF/DT mounting.
  - [Crossed Roller Bearings](https://www.luoyangsongju.com/products/precision-crossed-roller-bearings): CRBT, CRBH, RA, RB, RE, RU series. 10-800mm bore. 3-4x rigidity vs ball bearings. Multi-directional load handling. Robot joints, index tables, medical equipment.
  - [Cylindrical Roller Bearings](https://www.luoyangsongju.com/products/cylindrical-roller-bearings): NN, NNU, N series. Double-row and single-row. 25-500mm bore. Maximum radial rigidity. Machine tool spindle floating end.
  - [Thrust Ball Bearings](https://www.luoyangsongju.com/products/thrust-ball-bearings): 511, 512, 513, 514, 532, 533 series. Single direction and self-aligning. 10-500mm bore. Vertical shafts, crane hooks, hydroelectric turbines.

## Company

- Name: Luoyang Songju Science and Technology Co., Ltd. (LYJSD)
- Founded: 2012
- Headquarters: No. 1 Wangcheng Road, Xigong District, Luoyang, Henan, China
- Factory: No. 2 Penglai Road, National University Science & Technology Park, Jianxi District, Luoyang, Henan, China
- Facility: 22,000 m2 (2,000 m2 R&D + 20,000 m2 manufacturing)
- Employees: 60+ including 10 senior engineers
- Quality: ISO 9001:2015 certified. Pre-shipment inspection video. 99.5% acceptance rate.
- Contact: jin@luoyangsongju.com | +86-18697796262
- Website: https://www.luoyangsongju.com

## Key Pages

- [About Us](https://www.luoyangsongju.com/about)
- [Products Overview](https://www.luoyangsongju.com/products/)
- [News & Technical Guides](https://www.luoyangsongju.com/news)
- [CNC Components Spec Quick Reference — Spindles, Guideways, Screws, Bearings](https://www.luoyangsongju.com/news/cnc-components-spec-quick-reference): One-page spec quick reference for Songju precision components: 27 electric spindle models (0.5-100 kW, 120,000 RPM, 0.001 mm runout), HJG-D linear guides, HJG-S ball screws ground C3/C5 and rolled C7, 8-100 mm, and P5/P4/P2 bearings.
- [C3/C5 vs C7 Ball Screw Accuracy](https://www.luoyangsongju.com/news/c2-vs-c7-ball-screw-accuracy): Songju HJG-S published supply is ground C3 and C5 plus rolled C7. Catalog V300p is 12 µm (grade 3) and 23 µm (grade 5).
- [P4 vs P2 Bearing Precision Grades — Which Does Your Spindle Need?](https://www.luoyangsongju.com/news/p4-vs-p2-bearing-precision-grades): P4 (ABEC-7) is the standard for CNC machine tool spindles; P2 (ABEC-9) delivers sub-micron runout down to 0.001 mm for grinding and ultra-precision spindles. Attribute comparison, application selector, and Songju P5/P4/P2 range.
- [HIWIN/THK/NSK Linear Guideway Interchange Guide](https://www.luoyangsongju.com/news/hiwin-thk-nsk-linear-guideway-interchange-guide): HJG-DA mounting comparison with major brands. Confirm the part number before ordering. Grades P/H/SP.
- [Linear Guide Drop-In Replacement Checklist](https://www.luoyangsongju.com/news/linear-guideway-drop-in-replacement-checklist): Drop-in linear guide checklist for HIWIN, THK, NSK: rail width, hole pitch, carriage, accuracy, preload, and Songju HJG-D RFQ fields.
- [When to Upgrade from P4 to P2 Spindle Bearings](https://www.luoyangsongju.com/news/when-to-upgrade-from-p4-to-p2-spindle-bearings): Decide when to upgrade CNC spindle bearings from P4 (ABEC-7) to P2 (ABEC-9): process tree, pairing pitfalls, Songju P5/P4/P2 RFQ tips.
- [Grinding Spindle vs Milling Electrospindle](https://www.luoyangsongju.com/news/grinding-spindle-vs-milling-electrospindle-selection): OEM guide to choosing grinding spindles vs milling electrospindles: duty cycle, kW/RPM, BT/HSK, runout, and Songju RFQ checklist.
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