WALTER WNMG080404-FM5 WSM20S Turning Insert – 10 pcs
WALTER BCMT160530R-G55 WKP35S Rhomb Insert (10 pcs)
WALTER ADMT160608L-F56 WSP45G Milling Insert (10 pcs)
WALTER ADMT160608L-F56 WKP35S Milling Insert (10 pcs)
WALTER SNMX120520-F57 WKP25S （10pcs） Square Milling Insert
WALTER Tools: Premium German CNC Inserts for Turning & Milling
Walter AG is a 107-year-old German manufacturer of precision carbide inserts, founded in 1919 in Tubingen, Germany. Operating independently within the Sandvik Group since 2017, Walter supplies turning and milling inserts under its signature Tiger·tec® Silver (CVD) and Tiger·tec® Gold (PVD) coating platforms. Our Walter collection curates five high-demand grades — WKP25S, WKP35S, WSM20S, WSP45G — for steel, stainless steel, and cast iron machining, backed by same-day shipping to 50+ countries via DHL / UPS / FedEx.
Why Choose Walter Inserts for CNC Machining
Walter's reputation in the CNC tooling market rests on four differentiators that translate directly into shop-floor performance:
Tiger·tec® Silver (CVD) + Gold (PVD)
Dual coating platforms optimized for steel (Silver, ISO P10–P45) and stainless / high-temperature alloys (Gold, ISO M05–M30 / S05–S20). Each layer (TiCN, Al2O3, TiCN, TiAlN, ZrN) is engineered for wear resistance and thermal stability at sustained cutting temperatures above 800°C.
107 Years of Tooling Heritage
Walter AG has supplied precision cutting tools since 1919, with the Tubingen headquarters continuing to drive R&D in insert geometry, chip breaker design, and grade substrate formulation. Brand lineage includes the Xtra·tec® shoulder milling and Porcupine high-feed families.
Independently Operated within Sandvik Group
Acquired by Sandvik in 2017 but retained as a standalone brand with separate engineering, distribution, and pricing structures. Customers get the rigor of Sandvik-grade metallurgy with Walter-specific Tiger·tec® coating IP.
On-Demand Sourcing with Stock Backing
Cnchome-Beyond maintains core stock of the five Walter grades most requested by US/EU manufacturers (WKP25S, WKP35S, WSM20S, WSP45G, plus equivalents for ADMT/SNMX milling). Larger orders ship direct from Walter EU warehouse within 5-7 business days.
Walter Inserts in Stock: 5 Curated Grades
The five Walter inserts currently in our live inventory cover the most common turning and milling operations on ISO P (steel), M (stainless), and K (cast iron) workpieces. Each insert ships in packs of 10 with certificate of conformance.
| Walter Insert | Grade | ISO Application | Best For |
|---|---|---|---|
| WNMG080404-FM5 WSM20S | WSM20S (PVD TiN/Al2O3) | P10–P25 / M10–M20 | Steel & stainless finishing — negative rhomb geometry, sharp edge for chip control |
| BCMT160530R-G55 WKP35S | WKP35S (CVD TiCN/Al2O3/TiCN) | P25–P40 / M20–M30 | Steel roughing — positive 7° rhomb with reinforced G55 chipformer for interrupted cuts |
| ADMT160608L-F56 WSP45G | WSP45G (CVD TiCN/Al2O3) | P20–P45 | Steel heavy milling — square ADMT geometry with F56 chipformer for high-feed face milling |
| ADMT160608L-F56 WKP35S | WKP35S (CVD) | P25–P40 | Steel medium milling — same ADMT geometry, harder grade for longer tool life at elevated Vc |
| SNMX120520-F57 WKP25S | WKP25S (CVD) | P20–P35 / K15–K25 | Steel & cast iron heavy milling — reinforced SNMX square edge for roughing and cast iron |
Tiger·tec® Coating Technology: Silver vs Gold
Walter's two flagship coating platforms target different ISO material groups. Choosing the right platform is the single biggest lever for tool life and surface finish in production runs.
| Property | Tiger·tec® Silver (CVD) | Tiger·tec® Gold (PVD) |
|---|---|---|
| Coating type | Chemical Vapor Deposition | Physical Vapor Deposition |
| Layer stack | TiCN + Al2O3 + TiCN | TiAlN + Al2O3 + ZrN |
| Total thickness | ~12-18 µm | ~3-6 µm |
| Operating temperature | Up to 900°C sustained | Up to 800°C sustained |
| ISO material groups | P10–P45, K10–K25 | M05–M30, S05–S20, P05–P25 |
| Typical insert families | WKP25S, WKP35S, WSP45G | WSM20S, WSM21S, WAM415 |
| Best edge condition | Sharp & hone-ground for steel | Sharp for stainless (low BFE / built-up edge risk) |
| Cost premium vs uncoated | ~2.5× | ~3.0× |
Quick rule: Tiger·tec® Silver (CVD) for ISO P and K (steel / cast iron) operations where crater wear and thermal fatigue dominate. Tiger·tec® Gold (PVD) for ISO M and S (stainless / superalloy) operations where built-up edge and notch wear at the depth-of-cut line are the failure mode. For deeper grade chemistry breakdowns see our Grade Cross-Reference Hub.
Material Selection Guide: Which Walter Grade to Use
Match the workpiece material to the optimal Walter grade and chipformer. The matrix below covers the four ISO material groups most commonly machined with Walter tooling.
| Workpiece Material | ISO Code | Recommended Grade | Recommended Chipformer | Insert Geometry |
|---|---|---|---|---|
| Low-carbon steel (C<0.3%) | P10–P20 | WSM20S | FM5 (finishing) | WNMG (negative rhomb) |
| Alloy steel (HRC <35) | P25–P40 | WKP35S | G55 (medium-roughing) | BCMT (positive 7° rhomb) |
| Hardened steel (HRC 38-52) | P40–P45 | WSP45G | F56 (heavy milling) | ADMT (square milling) |
| Stainless steel (304, 316, 17-4PH) | M15–M30 | WSM20S | FM5 (sharp edge) | WNMG or RCMT |
| Cast iron (GG25, GGG60) | K15–K25 | WKP25S | F57 (heavy edge) | SNMX (reinforced square) |
| Aluminum alloy (6061, 7075) | N10–N25 | WSM20S (PVD sharp) | Sharp polished edge | CCGT / DCGT positive |
| Superalloy (Inconel 718, Titanium) | S15–S25 | WSP45G (Gold PVD variant) | Sharp hone-ground | RCMT / CNMG negative |
For detailed cutting parameter guidance, see our Speeds & Feeds Hub, and for application-specific tooling strategies, see Carbide Inserts by Operation.
Walter vs Competitors: Grade Equivalents
Walter grades are designed to be drop-in equivalent to competing brands across the major carbide suppliers. The table below maps Walter's most common grades to the four closest competing brands.
| Walter Grade | Mitsubishi Equivalent | Sandvik Equivalent | Kennametal Equivalent | Sumitomo Equivalent |
|---|---|---|---|---|
| WKP25S | US7020 | GC4325 | KCK20 | AC8025P |
| WKP35S | US7035 | GC4335 | KCP25 | AC8035P |
| WSM20S | US7020 | GC2015 | KCS10 | AC6020M |
| WSP45G | UE6035 | GC4345 | KCP45 | AC8045P |
| WTP35S | UT1025 | GC3015 | KT315 | AC1015U |
Note on equivalents: Walter Tiger·tec® Silver (CVD) typically delivers 15-25% longer tool life than first-generation CVD coatings in interrupted-cut applications, based on Walter-published field tests in P45 / K25 workpieces. For full cross-brand grade comparison data, see our Grade Cross-Reference Hub.
Walter Speeds & Feeds Reference
Starting parameters for the five Walter grades across the four most common ISO material groups. Always start in the lower third of the range and increase Vc only after confirming chip shape and flank wear stability.
| Walter Grade | Steel (P30) | Stainless (M20) | Cast Iron (K20) | Aluminum (N20) |
|---|---|---|---|---|
| WKP25S | Vc 220-280 m/min, fz 0.20-0.35 mm/rev | Not recommended | Vc 180-260 m/min, fz 0.15-0.30 | Not recommended |
| WKP35S | Vc 180-240 m/min, fz 0.25-0.45 mm/rev | Vc 120-180 m/min, fz 0.20-0.35 | Vc 150-220 m/min, fz 0.20-0.40 | Not recommended |
| WSM20S | Vc 250-320 m/min, fz 0.15-0.30 mm/rev | Vc 180-240 m/min, fz 0.15-0.25 | Not recommended | Vc 400-800 m/min, fz 0.10-0.25 |
| WSP45G | Vc 150-200 m/min, fz 0.30-0.55 mm/rev | Vc 100-150 m/min, fz 0.25-0.45 | Vc 140-200 m/min, fz 0.30-0.50 | Not recommended |
| SNMX120520 + WKP25S | Vc 200-260 m/min, fz 0.40-0.80 mm/tooth | Not recommended | Vc 170-240 m/min, fz 0.30-0.70 | Not recommended |
Speeds must be reduced 30-50% when using long-reach holders, slender shafts (L/D > 4), or insufficient coolant pressure (< 70 bar). For tool holders specific callouts, see our Tool Holder Guide.
Explore Related Tooling & Resources
Walter inserts work best when paired with the right tool holder and operating parameter reference. The links below cover all six content hubs plus the ten brand collections we distribute.
Six Topic Cluster Pillars
Pillar 1 — grade selection by workpiece material (P / M / K / N / S / H).
Pillar 2 — turning, milling, drilling, threading insert geometry.
Pillar 3 — decode ISO 1832 insert nomenclature (CNMG, WNMG, ADMT).
Pillar 4 — equivalent grades across 8 brands (Walter / Mitsubishi / Sandvik / Kyocera / Tungaloy / KORLOY / TaeguTec / ZCC.CT).
Pillar 5 — Vc / fz / ap starting parameters by material and operation.
Pillar 6 — boring bar / end mill holder / collet selection.
Other Brand Collections We Distribute
Japanese-origin carbide tooling with US7020 / UE6035 PVD grades.
PR series coated carbide turning inserts, CA6515 / PR1125 grades.
GC series turning + CoroDrill indexable drilling.
AC8025P / AC8035P CVD turning grades.
Japanese tooling with T9000 series turning inserts.
Korean carbide tooling with NC series turning + milling grades.
Korean tooling with TT8000 series turning grades.
Chinese carbide with YBC series turning + DNMG / CNMG families.
Israeli tooling with IC907 / IC908 chipformers.
SNR / SNL boring bars for 08IR–27IR threading inserts.
Reading from the Field
Identify genuine carbide vs HSS / coated HSS by spark test, weight, and edge geometry.
BT40 vs CAT40 vs HSK63A: taper standards, applications, and pull-stud compatibility.
Internal boring tool types for finishing, roughing, and contour work on CNC lathes.
Frequently Asked Questions
What is Tiger·tec® Silver coating, and what is it best for?
Tiger·tec® Silver is Walter's CVD (Chemical Vapor Deposition) coating platform for steel and cast iron turning — a three-layer stack of TiCN (titanium carbonitride), Al2O3 (alumina), and a final TiCN wear indicator layer. Total thickness ~12-18 µm. It targets ISO P10–P45 and K10–K25 workpieces and operates at sustained temperatures up to 900°C. The signature feature is the silver top coat that visibly wears, giving a built-in end-of-life signal.
What is the difference between Walter WSM20S and WKP35S?
WSM20S is a PVD-coated grade (Tiger·tec® Gold family, TiAlN + Al2O3 + ZrN stack) optimized for finishing stainless steel and low-carbon steel, with a sharp honed edge to minimize built-up edge. WKP35S is a CVD-coated grade (Tiger·tec® Silver family) with a thicker Al2O3 layer for thermal stability in medium-to-rough steel machining. In short: WSM20S for finishing stainless; WKP35S for roughing steel at higher Vc.
Is there a Walter equivalent to Mitsubishi US7020 or Sandvik GC4325?
Yes. Walter WKP25S is the closest drop-in equivalent to Mitsubishi US7020 and Sandvik GC4325 in ISO P25 / P30 steel turning. WKP35S aligns with Mitsubishi US7035 and Sandvik GC4335 in P35 / P40 steel. WSM20S aligns with Sandvik GC2015 in stainless finishing. For the full 8-brand cross-reference matrix, see our Grade Cross-Reference Hub.
How do I select a Walter milling insert for stainless steel?
For stainless milling, choose a PVD Tiger·tec® Gold grade (WSM20S variant) with a positive geometry (ADMT / RDMT) and sharp honed edge. Run Vc at 150-220 m/min and fz at 0.10-0.18 mm/tooth with high-pressure coolant (70+ bar). Avoid CVD grades in stainless — the thick Al2O3 layer is prone to chipping under the cyclic loads of milling.
Can Walter BCMT inserts be used on Swiss-type lathes?
Yes, with caveats. Walter BCMT inserts (e.g., BCMT160530R-G55 WKP35S) fit any holder that accepts the corresponding ISO BCMT 16 geometry. For Swiss-type lathes, the constraint is holder OD: most Swiss lathes accept 12-16 mm shank boring bars, so use a Walter S...-BCMT holder in the 12 mm shank class. For deep-reach Swiss work, consider the SNL-style long-reach equivalent.
What is the lead time for Walter inserts to the US or EU?
The five Walter grades in our live inventory (WKP25S, WKP35S, WSM20S, WSP45G, plus the SNMX120520 / WKP25S combination) ship same-day from our Hong Kong warehouse with DHL Express to US / EU destinations in 3-7 business days. Custom Walter grades not listed in our live catalog ship direct from Walter's Tubingen factory in 7-14 business days, with full Certificate of Conformance and Sandvik Group chain-of-custody documentation.
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Send us your Walter insert reference (e.g., WNMG080404-FM5 WSM20S, 10 pcs) and we will return a landed-price quote including DHL / UPS / FedEx freight to your country. Volume discounts: 2-9 pcs 6% off, 10+ pcs 12% off. We accept PO from automotive, aerospace, medical, and general machining manufacturers.
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