Excision Bi-Alfa Cobalt M42 Band Saw Blade 62020508-2385 2385 x 20 x 0.9mm 5/8 TPI

62020508 is the code for this Excision Bi-Alfa Cobalt M42 band saw blade: 20mm wide, 0.9mm thick, 5/8 TPI, with 50 lengths from 2385mm to 2960mm listed.

The maker describes this range as having HSS-M42 cutting tips: very hard, evenly distributed carbides in the tooth tips, formed during hardening and tempering, are given as the source of its high wear resistance. The tips have a martensitic structure and a high cobalt content, which the maker says give heat resistance and toughness and reduce wear at high sawing speeds, and a high chromium backing lets the blade withstand flexing stresses, tension and blade guide pressure (manufacturer-stated).

Product Guide p14 shows a normal tooth (N) and a hook tooth side by side (manufacturer-stated); the guide does not say which tooth form applies to which code. The listing gives the pitch as 5/8 TPI, a combi (variable) pitch: the maker explains that the first figure is the largest distance between tooth tips and the second the smallest distance within one group, and that a combi pitch widens the blade's application area and reduces vibration (manufacturer-stated).

Where this product is used

• General machining of steel (manufacturer-stated)
• Carbon steels, stainless steels, copper and aluminium, as rated in the maker's guide comparison table (manufacturer-stated)

Features

• HSS-M42 cutting tips (manufacturer-stated)
• Bi-metal blade with 8% cobalt content (supplier-stated)
• Hard, evenly distributed carbides in the tooth tips, formed during hardening and tempering (manufacturer-stated)
• Martensitic tip structure and high cobalt content for heat resistance and toughness at high sawing speeds (manufacturer-stated)
• High chromium backing that withstands flexing stresses, tension and blade guide pressure (manufacturer-stated)

Key specifications

Selecting the right option

Measure first. The maker's method for blade length is to set the wheels about the middle of their adjustment range, then add pi times the radius of each wheel to twice the distance between the wheel centres (manufacturer-stated). The option selector lists 50 lengths from 2385mm to 2960mm; the digits after the dash in the part code give the length in mm. The maker says the TPI has to suit the thickness of the material being cut or blade life is dramatically shortened, and suggests aiming for 5 to 7 teeth in the cut (manufacturer-stated). Its tooth selection chart for solid material (Product Guide p32) lists 5/8 TPI for material 25 to 40mm in diameter (manufacturer-stated). For band speed, its chart for bimetal blades (Product Guide p31) runs from 80 to 90 m/min on construction and machining steel down to 15 to 25 m/min on heat resistant steels (manufacturer-stated).

Related products

Other Excision blades to compare: Bi-Alfa Cobalt M42 62020508, lengths 2965mm to 3610mm, Bi-Alfa Cobalt M42 20 x 0.9mm, 4 TPI (62020004) and Bi-Alfa Cobalt M42 27 x 0.9mm, 5/8 TPI (62027508).