Product Features
- NSK WBK lock nut (high speed / high load) - thread M20×1
- Anti-loosening brass pad + set screw; reference tightening torque 4,500 N·cm
- Support units ship with a lock nut - this is a separately sold spare / replacement item
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Product Overview
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Support Units & Accessories/Ball Screw
WBK20L-31H
Product Description
WBK20L-31H is an NSK lock nut for WBK-series ball screw support units (high speed / high load, -31H series): thread M20×1, outer diameter 40 mm, with an anti-loosening brass pad + set screw design and a reference tightening torque of 4,500 N·cm. Support units ship with a lock nut included; this item is sold separately as a spare / replacement. Tightening torque is a reference value with support bearings in a face-to-face (DF) arrangement.
Other sizes
WBK17L-31H, WBK25L-31H, WBK30L-31H, WBK35L-31H, WBK40L-31H
Matching support units
Complete-Set Selection
We recommend quoting support units and lock nuts together with your ball screw: include the screw part number (or shaft diameter) in your inquiry and Nahshon will match fixed- and support-side units and lock nuts per the official NSK shaft-end tables (E3162 B27–B30) — one quotation, one complete delivery.
Product Specifications
| Specification | Unit | WBK20L-31H |
|---|---|---|
| Series | - | WBK lock nuts (high speed / high load, -31H) |
| Thread specification G | - | M20×1 |
| Outer diameter D | mm | 40 |
| Set screw | - | M6×2 (with brass pad) |
| Tightening torque (reference) | N·cm | 4,500 |
| Anti-loosening design | - | Brass pad + set screw |
| Matching shaft end | - | WBK20DF-series support unit shaft ends |
| Dimension table | - | NSK CAT. No. E3162 B398 (attached PDF) |
Related Files
- NSK E3162 鎖緊螺帽（B397–B398）Download
FAQ
How do I choose between precision grades C3, C5 and C7?
For measurement and machining equipment that need high positioning accuracy, choose the ground-finish C3/C5 grades; for general material handling and automation mechanisms, the rolled-finish C7 grade is sufficient and offers a cost and lead-time advantage.
Can the shaft ends be custom-machined?
Yes. Nahshon offers custom shaft-end machining for NSK ball screws, completing shaft-end turning and heat treatment to your drawings, saving you the in-house machining step.
How do I confirm pricing and lead time for WBK20L-31H?
Nahshon is the NSK distributor in Taiwan. Add WBK20L-31H to your inquiry list along with your stroke, load and operating conditions, and we'll confirm the specification, quote and lead time.
Series Models
Support Units & Accessories・WBK lock nuts (high speed / high load, -31H)
WBK15SF-01BWBK17-01AWBK17DF-31HWBK17L-01WBK17L-31HWBK17S-01WBK20-01WBK20-11WBK20DF-31HWBK20L-01WBK20L-31H（This page）WBK20S-01WBK20SF-01BWBK25-01WWBK25-11WBK25DF-31HWBK25DFD-31HWBK25L-01WBK25L-31HWBK25S-01WWBK25SF-01
View All Support Units & Accessories Models →