TrueSwiss PrecisionStockTM
Precision Ground Bar Materials Built Engineered for the Most Demanding Applications, Priced for the Everyday
TrueSwiss PrecisionStockTM is the precision bar brand from Centerless Products—engineered specifically for the demands of Swiss-type turning and other close-tolerance machining operations. Every bar in our inventory is sourced from premium mills and ground in-house to exacting standards, ensuring you receive material that performs consistently from the first bar to the last.
Why TrueSwiss PrecisionStockTM?
Sourcing precision ground bar and grinding services from a single supplier simplifies your supply chain, reduces lead times, and eliminates the inconsistencies that come with dual sourcing. At Centerless Products, we control the entire process—from raw material procurement through final grinding—so you can trust that every bar meets our standards before it reaches your machines.
A Different Approach to Precision Bar
At Centerless Products, we approach bar grinding fundamentally differently from traditional suppliers. Our background in finished component grinding means we apply the same exacting standards and attention to detail to every bar we produce—regardless of whether it will see further processing or move directly into production.
Many bar suppliers treat raw material as just that—raw. At Centerless Products, every bar is treated as a finished product. This means we consistently deliver:
- Superior surface finish — Smooth, uniform surfaces that reduce wear on downstream tooling and improve the performance of your final components
- Minimal diameter variation — Tight, consistent diameters maintained along the full length of each bar and from bar to bar, ensuring predictable performance in your machines
- Exceptional roundness — Tight cylindricity across every bar we produce
These aren’t exceptions or upgrades—they are our standard. We deliver these results consistently because we believe your material should perform as well as your finished parts.
Click here to learn more about our process.
Process Capability You Can Count On
Consistency isn’t something we achieve occasionally—it’s something we engineer into every production run. On all grinding processes, Centerless Products targets a minimum CpK of 1.66, representing a highly capable, statistically controlled operation. In practice, we frequently achieve CpK values of 4.00 or higher on tolerances of ±0.0005″ over extended production runs —translating directly into fewer rejected parts, reduced scrap, and greater confidence in your supply chain.
How TrueSwiss PrecisionStockTM Improves Your Operation
Switching to precision ground bar stock delivers measurable improvements across your entire machining process:
- Shorter Cycle Times — Near-net material means your machines remove less stock per part, reducing cycle times and increasing output without any changes to your programming or setup.
- Extended Tool Life — Consistent diameter and roundness mean cutting tools encounter uniform material on every part. This reduces wear and breakage, lowering your tooling costs and reducing unplanned downtime.
- Reduced Scrap — Tight dimensional consistency eliminates out-of-tolerance parts caused by material variation. In Swiss turning especially, where inconsistencies compound across small part features, this makes a significant difference.
- Less Operator Dependency — When material consistency is high, even less experienced operators achieve better results. Your team spends less time compensating for material variation and more time running productive cycles.
- Lower Cost Per Part — Precision ground bar costs more upfront, but the combined savings from faster cycles, longer tool life, reduced scrap, and fewer secondary operations typically result in a meaningfully lower total cost per part.
- Lights-Out Confidence — Consistent bar dimensions feed smoothly and predictably, reducing the risk of seized bushings or bar-feeder jams. Run your machines unattended with greater confidence.
Available Grades
TrueSwiss PrecisionStockTM is stocked in the most commonly specified grades for Swiss-type machining:
| GRADE | SPECIFICATIONS |
|---|---|
| 303 | UNS S30300, ASTM A582, ASTM F899, AMS 5640 |
| 304 | UNS S30400, ASTM A276, ASTM F899, AMS 5639, AMS 5647 |
| 316 | UNS S31600, ASTM A276, ASTM F899, AMS 5648, AMS 5653 |
| 416 | UNS S41600, ASTM A582, ASTM F899, AMS 5610 TYP 1 |
| 440C | UNS S44004, ASTM A276, ASTM F899, AMS 5630, AMS 5880 |
| 17-4 ( 630 ) | UNS S17400, ASTM A564, ASTM F899, AMS 5643 |
| 17-4 H900 | UNS S17400, ASTM A564, ASTM F899, AMS 5643 |
| 17-4 H1150 | UNS S17400, ASTM A564, ASTM F899, AMS 5643 |
Additional materials are available upon request. Contact us to discuss your specific alloy requirements, or explore all materials we work with.
Tolerance capabilities
The following table outlines what is achievable in TrueSwiss PrecisionStockTM.
| 144” bars | Cut lengths | |
|---|---|---|
| Diameters : | 0.008” to 2.00” | 0.008” to 4.00” |
| Diameter tolerance : | To ± 0.00005” ( 2.5 μm ) | To ± 0.000025” ( 1.25 μm ) |
| Roundness : | To 0.00002” ( 0.5 μm ) | To 0.00002” ( 0.5 μm ) |
| Straightness : | To 0.002”/foot ( 0.2mm/m ) | To 0.00015”/foot ( 0.015mm/m) |
| Surface roughness : | To 4 Ra μin ( 0.1 μm ) | To 2 Ra ( 0.05 μm ) |
| Diameter variation : | 1/2 of tolerance or 0.0002”, whichever is less | To 0.00002” ( 0.5 μm ) |
Tighter tolerances available upon request. Contact us to discuss your specific requirements.
Complementary Services
TrueSwiss PrecisionStockTM is just the beginning. To deliver complete solutions, Centerless Products offers a full range of complementary services both in-house and through our network of certified industry partners:
- Precision Straightening — Rotary two-roll and press-type methods
- Cutting Services — Bandsaw, cold saw, abrasive cut-off, and electro-chemical cutting for precise, burr-free blanks
- Pointing & Chamfering — Prepared ends for easier loading and feeding into your machines
- Material Testing & Validation — ISO 17025 certified laboratory analysis including chemical composition, mechanical properties, eddy current inspection, ultrasonic testing, and XRF material identification
- Heat Treatment — NADCAP certified processing to ASTM, AMS, and MIL specifications
- Supply Chain Solutions — Customized programs designed around your production requirements
- Specialized Packaging — Protective packaging for direct shipment to you or your customers, including white-label options
Ready to Experience the Difference?
TrueSwiss PrecisionStockTM delivers material that performs as well as your finished parts.
Contact Centerless Products today to discuss your precision bar requirements or request a quote.