Каталог Iscar высокоточные развертки и метчики 2022

DIN 371 Chamfer Lead Length for Sets of 3 Hand Taps

L5 L3 ca. 6 threads ca. 2 threads

		L	First taper tap	Second tap	Bottoming tap
D	- Major diameter

d2	- Shank diameter		Tap Styles for Hole Types
d3	- Chamfer diameter	Throughole

d4 - Neck diameter DIN 376 1 Straight fluted tap with spiral point Cf L6

d4 D d3

	2 Left-hand spiral fluted tap L2 L4 L1
	L
L	- Total length
L	- Total length
L1	- Thread length
L2	- Shank length

L3	- Square length	3 Straight fluted tap with long chamfer lead
L4	- Neck length
L5	- Chamfer length
		Blind hole
L6	- Flute length
S	- Square size
Cm - Center male
		1 Right-hand spiral fluted tap
Cf	- Center female
		Chamfer Lead Forms According to DIN 2197
	6-8 threads	Form A
A		Long, 6-8 threads for
		short through holes.
		2 Straight fluted tap with short chamfer lead
	3.5-5 threads	Form B
B		Medium, 3.5-5 threads, with
		Front and End Configurations According to DIN2197 spiral point for all through holes

and deep tapping holes. Front End Shank End

			1	External Center	4	External Center
	2-3 threads	Form C
C		Long, 2-3 threads for blind holes
		and generally for aluminum
		grey cast iron and brass.
			2	Stepped External Center	5	Chamfer
	3.5-5 threads	Form D
D		Medium, 3.5-5 threads for through
		and blind holes with sufficient runout.
			3	Internal Center	6	Internal Center
	1.5-2 threads	Form E
E		Extremely short, 1.5-2 threads
		for blind holes with little runout
		depth. Avoid use if possible.	Thread Dia.

		Front End		Shank End		Tap Standard
	Range (mm)
	≤Ø6	1		4	5	DIN352
1-1.5 threads Form F
F Extremely short, 1-1.5 threads	Ø7	1	2	4	5	6 DIN371
for blind holes with little runout	≥Ø8	1	2	3 5	6	DIN376

depth. Avoid use if possible.

Каталог Iscar высокоточные развертки и метчики 2022 - страница 53