BUMAX® 88
BUMAX 88® is a premium A4 fastener that offers better corrosion resistance than standard A4 due to higher molybdenum content.
BUMAX Grades
We offer a range of stainless steel grades to ensure the perfect fastener solution to meet your specific application.
Our experts can guide you in selecting the ideal grade by considering key factors such as corrosion resistance, temperature tolerance, mechanical strength, and magnetic permeability. Choosing the right stainless steel grade guarantees durability, reliability, and cost efficiency over its lifespan.
With years of expertise, we specialize in identifying the best materials to meet your unique requirements – ensuring optimal performance and long-term value.
We specialize in unique designs and custom-made fasteners developed together with our customers. However, we also keep a large stock of standardized products for immediate delivery.
| Grade | Strength, min TS/YS (MPa) |
Steel Standard |
Fastener standard | Micro structure | C max | Cr | Ni | Mo | Other | PRE¹ |
|---|---|---|---|---|---|---|---|---|---|---|
| BUMAX 88 | 800/640 | 1.4432/36/35 | A4 | Austenitic | 0.03 | 17 | 11.5 | 2.7 | 27 | |
| BUMAX 109 | 1000/900 | 1.4432/36/35 | A4 | Austenitic | 0.03 | 17 | 11.5 | 2.7 | 27 | |
| BUMAX NITRO 109 | 1000/900 | S20910 | Austenitic | 0.01 | 20 | 18 | 6.2 | N, Cu | 34 | |
| BUMAX SA | 800/640 | 1.4547, S31254 | A8 | Austenitic | 0.02 | 20 | 18 | 6.2 | N, Cu | 43 |
| BUMAX SAN35 | 1000/900 | N08935 | Austenitic | 0.03 | 27 | 35 | 6.5 | N, Cu | 52 | |
| BUMAX DX 129 | 1200/1080 | 1.4462, S32205 | D6 | Ferrite-Austenitic | 0.03 | 22 | 5.2 | 3.2 | N | 36 |
| BUMAX DX 149 | 1400/1260 | 1.4462, S32205 | D6 | Ferrite-Austenitic | 0.03 | 22 | 5.2 | 3.2 | N | 36 |
| BUMAX SDX 109 | 1000/900 | 1.4410, S32750 | D8 | Ferrite-Austenitic | 0.03 | 25 | 7 | 4 | N | 42 |
| BUMAX SDX NORSOK | 750/550 | 1.4501/1.4410 S32760/S32750 | Norsok M630 MDS D60 | Ferrite-Austenitic | 0.03 | 25 | 7 | 4 | N, W, Cu | 42 |
| BUMAX ULTRA | 1500/1350 | Martensitic | 0.02 | 12 | 9 | 4 | Al, Ti, Cu | 25 | ||
| BUMAX HE | 1000/900 | 1.4980, S66286 | Austenitic | 0.08 | 15 | 26 | 1.5 | Ti, V | ||
| BUMAX HEP | 1000/600 | 2.4952, N07080 | Austenitic | 0.10 | 19 | >65 | – | Al, Ti, Co |
BUMAX® 109
BUMAX® 109 is the strongest A4 fastener on the market. We use the same material as Bumax 88 but achieve higher strength due to a special manufacturing process.
BUMAX® SA
BUMAX® SA is a 6Mo high-alloy austenitic stainless steel for seawater and other aggressive chloride bearing medias.
BUMAX® DX 129
BUMAX® DX 129 is a duplex stainless steel product with very high strength combined with excellent corrosion resistance.
BUMAX® SDX 109
BUMAX® SDX 109 is a super duplex grade with excellent mechanical properties, and exceptional resistance to general crevice, pitting and stress corrosion in aggressive environments.
BUMAX® ULTRA
BUMAX® Ultra, a unique precipitation hardenable stainless steel that can be delivered in ultra-high strength levels.
BUMAX® HE
BUMAX® HE is a high temperature resistant material for applications requiring high strength and good oxidation resistance at temperatures up to 700°C.
BUMAX® HEP
BUMAX® HEP is a high temperature resistant material with excellent oxidation resistance and high tensile and creep properties at temperatures up to 815°C.
BUMAX® SDX NORSOK
BUMAX® SDX Norsok fasteners are accredited to NORSOK certification and can be provided in super duplex grades.