Spindle Assemblies
Belt and motor spindles built with matched bearings, runout measured at the nose.
Spindles assembled with matched, preloaded bearings and the runout measured at the nose where the tool sits. A spindle that reads well at the bearing but poorly at the nose is still a bad spindle.
5–8 weeks
1 piece
ISO 9001:2015
Technical Specifications
| Parameter | Value | Unit |
|---|---|---|
| Nose runout | ≤0.005 | mm TIR |
| Bearing class | ABEC 7 / P4 | - |
| Preload | Set and recorded | - |
| Max speed | To 24,000 | rpm |
| Balance | G1.0 (on request) | - |
| Test | Runout + warm-up run | per unit |
Available Materials
Typical Applications
- Machine tool spindles
- Grinding spindles
- High-speed routing heads
- Test rig shafts
- Polishing heads
Surface Finishes
- Ground journals and nose
- Assembled and preloaded
- Lubricated and sealed
- Balanced (on request)
Industries Served
- Tooling & Mould Making
- Aerospace
- Automotive & EV
- Medical
- Semiconductor
What drives the price of this part
Derived from the callouts on this page. Where a driver is not on the drawing, it is not on this list.
- Material
- The first material listed, Carbon Steel 4140 (42CrMo4), rates 6/10 on our machinability scale at 197–235 HB annealed · 28–32 HRC quenched and tempered. On this shop's scale a harder alloy means slower passes and more tool changes, and that is cycle time the quote has to carry.
- Order size
- Minimum order is 1 piece, so on a first order setup and programming are spread over very few parts and they are most of the price. Repeat orders at the same quantity are cheaper without anything on the drawing changing.
- Certification and paperwork
- ISO 9001:2015. On a certified family the inspection and documentation work is part of the price: first article inspection, material traceability and the dimensional report are produced per order, not per sample.
See how cycle time is calculated in the machining time calculator and what else moves a price in the cost driver reference.
How these parts are inspected
Matched to the callouts above and the instruments actually on the floor.
- Coordinate measuring machine (Zeiss CONTURA G2, two machines, GR&R 8.4% on the critical feature)
- Dimensional report against the drawing, with a 100% check on critical features rather than a sample
- Certificate of conformance and the mill certificate with every shipment
The full equipment list, with counts, is on the capability page; the inspection sequence is on quality and inspection.
Questions buyers ask
- Why measure runout at the nose instead of at the bearing?
- Because that is where the tool is. Bearing runout plus a stack-up of faces can double the number at the nose, and the nose is what the cut sees.
Related part families
Angular Contact Ball Bearings
Single and paired angular contact bearings ground for preload, ABEC 5–7.
Precision Ball Bearings
ABEC 5–7 deep-groove and angular contact ball bearings, runout verified on every finished race.
CNC Turned Shafts
Turned and ground shafts, pins and spindles held to 0.005 mm TIR on bearing journals.