This is a 12" (300 mm) bi-metal hacksaw blade with an 18 TPI (teeth per inch) tooth pitch, designed for precision hand cutting of metal and other hard materials. Its primary use is in handheld hacksaw frames for cutting thin-walled sections, tube, bar, conduit and strip where a fine tooth count gives a smooth cut and reduced burring when working on thin or finished components.

The blade is manufactured using a bi-metal construction: high speed steel (commonly M42 grade) teeth electron-beam welded to a spring steel backing. The HSS teeth provide a hard cutting edge (tooth hardness typically in the HRC 62–66 range) while the flexible alloy backing gives toughness and resistance to breakage. The blade carries a black phosphate finish to reduce surface corrosion and improve run-in behaviour in the saw frame. Length and pin-hole spacing conform to standard 12" hacksaw frame dimensions so the blade is compatible with most conventional hand frames.

Teeth are ground and set to give reliable chip clearance and reduced clogging; the 18 TPI profile is best suited to cutting thin-walled mild steel, stainless steel tube, copper, aluminium and various non-ferrous materials as well as plastics. While coarser blades remove material faster, 18 TPI balances cut speed and finish quality, making it a popular choice in engineering and maintenance settings. The blade is produced in facilities that work to recognised quality management practices and meets industry expectations for DIN, ISO and BS style hand saw blade tolerances where applicable.

Typical applications include metal fabrication shops, mechanical and maintenance workshops, plumbing and gas work, electrical installation, HVAC and general workshop use. Key benefits are the extended cutting life delivered by M42 HSS teeth, improved fracture resistance from the flexible backing, corrosion protection from the phosphate finish and broad compatibility with standard 12" hacksaw frames.

Duchy Fasteners stocks this 12" 18 TPI bi-metal hacksaw blade in a range of pack quantities and size variants; please contact us for availability of individual blades and multi-packs.