Excision Bi-Alfa Cobalt M42 Band Saw Blade 620139004-3115 3115 x 13 x 0.9mm 4 TPI

This page is for the Excision Bi-Alfa Cobalt M42 blade in the 13 x 0.9mm size with 4 TPI (base code 620139004), listed in 68 lengths from 3115mm to 6590mm. Each length has its own part code: the base code, a dash and the length in mm.

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 4 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

To order the right length, measure the saw: with the wheels set about the middle of their adjustment range, the maker adds pi times each wheel radius to twice the wheel centre distance to get the blade length in mm (manufacturer-stated). The option selector lists 68 lengths from 3115mm to 6590mm, and the number after the dash in each part code is that length. 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). 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

Neighbouring sizes: Bi-Alfa Cobalt M42 620139004, lengths 685mm to 3000mm, Bi-Alfa Cobalt M42 13 x 0.6mm, 4 TPI (62013004) and Bi-Alfa Cobalt M42 10 x 0.9mm, 4 TPI (620109004).