Taps for fine, pipe and inch threads

Metric fine, pipe G, Whitworth, UNC, UNF, UNEF, Pg and round, right- and left-hand: the same geometries for through and blind holes as the metric taps.

ISO P

ISO M

ISO K

ISO N

G (BSP)

UNC / UNF

Left-hand

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Geometry by material

Chamfer, helix and rake chosen for the material

DIN 371 / 376 sizes

Metric, fine, pipe and inch, also custom made

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Description

Technical drawing

Available threads

System	Range	Application
Metric fine MF	from MF 3 × 0.35 to MF 52 × 4	All ISO fine pitches, tolerance 6H
Parallel pipe G (BSP)	from G 1/8″ to G 2″	Fittings, hydraulics and pneumatics, gasket sealing
Whitworth BSW	from 1/8″ to 2″	Machinery and spare parts of British manufacture
UNC	from no. 2-56 to 3″-4	Inch coarse pitch, tolerance 2B
UNF	from no. 2-64 to 1.1/2″-12	Inch fine pitch, tolerance 2B
UNEF	from no. 12-32 to 1.1/2″-18	Inch extra-fine pitch
UN constant pitch	from 9/16″-20 to 3″-8	Large diameters with constant pitch
Pg (electrical conduit)	from Pg 7 to Pg 48	Cable glands, switchboards and electrical systems
Round Rd	from Rd 8	Robust thread for fittings and connections
Left-hand	M, MF and G	Same geometries as right-hand taps, for through and blind holes

Taper threads (NPT, BSPT), trapezoidal Tr and profiles to drawing: see the custom tap.

Geometries and materials

Through holes	Spiral point, form B
Blind holes	Right-hand helix 15°, 35° or 45° depending on the material, form C
Cast irons and short chips	Straight flutes, form C
Materials	Annealed and quenched and tempered steels, stainless steels, cast irons, aluminium: substrate and coating as for metric taps (see the guide below)
Design	Reinforced or reduced shank depending on size (DIN 371, 376, 374, 2184-1)