Sine Bars & Angle Fixtures
Sine bars and angle setting fixtures for accurate angles without a protractor.
Sine bars that set an angle from gauge blocks rather than from a protractor scale, because the angle resolves to the block stack. The roll centres are the calibration.
How we make it: Custom CNC parts service →
4–7 weeks
1 piece
ISO 9001:2015
Technical Specifications
| Parameter | Value | Unit |
|---|---|---|
| Roll centre accuracy | 0.002 | mm |
| Length range | 100–500 | mm |
| Angle range | 0–45 | ° |
| Roll diameter | ±0.001 | mm |
| Flatness | 0.002 | mm |
| Certification | Calibration report | included |
Available Materials
- Steel 52100 (hardened)
- Tool steel A2
- Cast iron bodies
- Bronze (rolls)
Typical Applications
- Angle inspection
- Grinding setup
- Taper turning setup
- Protractor replacement
- CMM verification
Surface Finishes
- Hardened and ground
- Lapped rolls
- Black oxide
- Laser marked centres
Industries Served
- Tooling & Mould Making
- Aerospace
- Automotive & EV
- Industrial Equipment
- Medical
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.
- Tolerance
- Flatness at 0.002 mm is the tightest callout this family carries. Tightening a callout is a process decision, not a machining decision: below the standard ±0.005 mm the work moves to grinding or jig boring, and the price moves with it.
- Part size
- Length range at 100–500 mm decides which machine the part lands on and how many setups it needs. Size is the driver buyers most often leave out of a first enquiry, and it is the one that changes the quote fastest.
- Material
- The first material listed, Bearing Steel 52100 (100Cr6), rates 4/10 on our machinability scale at 60–66 HRC hardened · 183–217 HB annealed. 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.
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 is a sine bar more accurate than a protractor?
- Because it converts the angle into a length you can stack with gauge blocks. A protractor scale has graduations; a sine bar has a stack you can measure.
Related part families
Angle Plates & Setup Blocks
Ground angle plates and setup blocks that put a workpiece on a known plane.
Inspection Stands & Bench Fixtures
Stands that hold a part for CMM or manual inspection, at a repeatable orientation.
Checking Gauges
Attribute gauges for shop-floor checking, built to 10% of the part tolerance and certified.