Excision Bi-Alfa Cobalt M42 Band Saw Blade 620135018-685 685 x 13 x 0.5mm 18 TPI

Excision Bi-Alfa Cobalt M42 band saw blade, 13mm wide, 0.5mm thick, 18 TPI, base code 620135018. It is listed in 89 lengths from 685mm to 5885mm.

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 18 TPI, a constant pitch: the maker describes this as the same distance from tooth to tooth and as very suitable for cross sections and non-ferrous materials (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

Start with the blade length your saw needs. The maker's method is to set the wheels about the middle of their adjustment range, measure the distance between the wheel centres and the radius of each wheel, and add pi times each radius to twice the centre distance (manufacturer-stated). Pick that length in the option selector: the part code is the base code, a dash and 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 18 TPI for material 0 to 5mm 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

Also in this range: Bi-Alfa Cobalt M42 13 x 0.6mm, 14 TPI (62013014), Bi-Alfa Cobalt M42 20 x 0.9mm, 18 TPI (62020018) and Bi-Alfa Cobalt M42 13 x 0.5mm, 14 TPI (620135014).