Introduction
In CNC machining, ballscrew accuracy directly impacts positioning repeatability and surface finish quality. The Fadal NSK Ballscrew Assembly (BLS-0137N-ASS) is the OEM-grade solution for restoring ±0.0005" precision to your 4020 machine's X-axis.

This comprehensive guide covers:

1. Why NSK ballscrews outperform generic replacements
2. Step-by-step installation best practices
3. Maintenance advantages of non-coolant-thru design
4. Troubleshooting common wear symptoms
5. Why ITSCNC guarantees worry-free procurement

Why the BLS-0137N-ASS Matters for X-Axis Performance

• Precision-ground screws (Grade C3 backlash tolerance)

• Matched nut assemblies for minimal preload loss

• Hardened steel construction (50% longer life vs. aftermarket)

2. Optimized for 4020 Machines

• 4020" travel length (perfect for standard work envelopes)

• Non-coolant-thru design simplifies maintenance

3. Complete Drop-In Assembly

Includes:

• Preloaded ballnut

• Machined mounting flanges

• Thrust bearings

• Couplers

No need to source components separately

Technical Specifications

Signs You Need Ballscrew Replacement

Critical Symptoms

Backlash exceeding 0.001" (check with dial indicator)
Visible pitting/wear on screw flanks
Sticking or rough motion during rapid traverses
 Positional drift during contouring

Pro Tip:

Test backlash by:

1. Mounting a dial indicator to the table

2. Commanding small movements (0.010")

3. Measuring difference between commanded/actual movement

Installation Guide

1. Pre-Installation Checks

• Clean ways and remove debris

• Verify servo tuning parameters (critical for new screws)

2. Mounting Procedure

1. Secure thrust bearings (torque to 18 ft-lbs)

2. Align coupling within 0.001" TIR

3. Preload adjustment (per NSK specs)

3. Post-Installation

• Lubricate with ISO 68 way oil

• Run test cuts to verify accuracy

Maintenance Advantages of Non-Coolant-Thru Design

No clogged coolant passages to clean
Reduced corrosion risk in humid environments
Easier lubrication (grease fittings accessible)

Note: Requires manual lubrication every 500 hours

Why Choose ITSCNC?

1. Genuine NSK Assemblies – No Chinese knockoffs

2. 1-Year Warranty – Coverage for defects

3. Expert Support – Installation guidance included

4. Fast Shipping – Most orders ship in 24hrs

FAQ

Q: Can I convert to coolant-thru later?
A: No – This is a sealed assembly. For coolant-thru, order BLS-0137C-ASS.

Q: My Y-axis screw is worn too—do you offer kits?
A: Yes! Ask about our X/Y matched set discounts.

Q: What lubrication is best?
A: Use NSK LG-72 grease or ISO 68 way oil.

Final Recommendation

Don’t let worn ballscrews cost you tolerances. The BLS-0137N-ASS delivers:
NSK precision out of the box
Simplified maintenance
1-year protection

Order today: Fadal NSK Ballscrew Assembly, X-Axis, 4020 Inch, Non Coolant Thru BLS-0137N-ASS
Need installation help? Call our CNC techs: 1-800-342-3475