Inserts for TMS • Thread Milling • Internal • UN Thread

Indexable Inserts • Thread Profiles

Features and benefits

Unified Thread Standard Style.

Workpiece Materials

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SAP Material Number	ISO Catalog Number	ANSI Catalog Number	Grade	TPI	[D] Insert IC Size	[D] Insert IC Size	[LI] Insert Length	[LI] Insert Length	[W] Cutting Width	[W] Cutting Width	Number of Teeth
2384504	STN1018UNI	STN1018UNI	KC635M	18	6.0000	.2362	10.4140	.4100	8.3820	.3300	6
2384505	STN1020UNI	STN1020UNI	KC635M	20	6.0000	.2362	10.4140	.4100	8.8900	.3500	7
2384509	STN1114UNI	STN1114UNI	KC635M	14	6.3500	.2500	10.9220	.4300	9.1440	.3600	5
2384510	STN1116UNI	STN1116UNI	KC635M	16	6.3500	.2500	10.9220	.4300	9.6520	.3800	6
2384511	STN1118UNI	STN1118UNI	KC635M	18	6.3500	.2500	10.9220	.4300	9.9060	.3900	7
2384512	STN1120UNI	STN1120UNI	KC635M	20	6.3500	.2500	10.9220	.4300	10.1600	.4000	8
2384513	STN1124UNI	STN1124UNI	KC635M	24	6.3500	.2500	10.9220	.4300	9.6520	.3800	9
2384514	STN1128UNI	STN1128UNI	KC635M	28	6.3500	.2500	10.9220	.4300	9.9060	.3900	1
1912477	STN1612UNI	STN1612UNI	KC635M	12	9.5250	.3750	16.0020	.6300	14.7320	.5800	7
2384517	STN1614UNI	STN1614UNI	KC635M	14	9.5250	.3750	16.0020	.6300	14.4780	.5700	8
1288604	STN1616UNI	STN1616UNI	KC610M	16	9.5250	.3750	16.0020	.6300	14.2240	.5600	9
2384521	STN1624UNI	STN1624UNI	KC635M	24	9.5250	.3750	16.0020	.6300	14.7320	.5800	14
2384522	STN1627UNI	STN1627UNI	KC635M	27	9.5250	.3750	16.0020	.6300	14.2240	.5600	15
2384524	STN1632UNI	STN1632UNI	KC635M	32	9.5250	.3750	16.0020	.6300	14.9860	.5900	9

Grades

KC610M

A high-performance, TiN-TiCN-TiN-PVD-coated carbide grade characterised by good hardness and wear resistance for milling all types of material and is the first choice for steel. KC610M should be used with coolant or minimal lubrication.

P

M

K

S
KC635M

Universal carbide grade with PVD coating (TiAlN). KC635M is a high-performance grade for finishing operations. This grade is characterised by high hardness and wear resistance.

P

M

K

H

TM25 Inserts

Materials	Brinell	surface speeds		indexable inserts
steel	HB	KC610M	KC635M	feed fz (IPT)
P1	125	100–210	90–180	0,05–0,20
P2	180	100–170	90–160	0,05–0,20
P3	225	60–130	70–115	0,05–0,20
P4	250	80–150	80–160	0,05–0,20
P5	275	75–130	80–160	0,05–0,15
P6	325	70–110	60–100	0,05–0,10
stainless steel
M1	180	100–170	120–180	0,05–0,10
M2	250	70–140	100–140	0,05–0,10
M3	330	70–120	100–120	0,05–0,10
cast iron
K1	180	60–130	100–120	0,02–0,08
K2	220	60–125	80–100	0,05–0,15
K3	260	50–90	60–90	0,05–0,10
non-ferrous
N1	60–100	100–250	–	0,05–0,25
high-temp alloys
S1	200	20–45	20–40	0,05–0,10
S2	250	20–30	20–30	0,02–0,05
S3	280	15–20	15–20	0,02–0,05
S4	350	10–15	10–15	0,02–0,05
hardened steel
H1	55 HRC	20–45	20–45	0,01–0,03

Methods of External Thread Milling


right-hand thread... conventional milling	left-hand thread... conventional milling

right-hand thread... climb milling	left-hand thread... climb milling

Methods of Internal Thread Milling


right-hand thread... conventional milling	left-hand thread... conventional milling

right-hand thread... climb milling	left-hand thread... climb milling

Minimum Bore Diameters

cutter	TPI	48	32	24	20	16	12	10	8	7	6	5.5	5	4.5	4.5	4	4
	pitch mm	0,5	0,75	1,0	1,25	1,5	2,0	2,5	3,0	3,5	4,0	4,5	5,0	5,5	–	6,0	–
	cutter diameter (D1)	minimum bore diameter (D) (inches)
K035TM1RW050-STN10	.35	.374	.394	.421	.449
K045TM1RW050-STN11N	.45	.472	.492	.520	.547	.571
K049TM1RW037LT11S	.49	.512	.531	.559	.587	.610
K061TM1RW062-STN16T	.61	.630	.650	.667	.705	.728	.768
K067TM2RW075-STN11D	.67	.693	.717	.748	.772	.787	.827
K075TM1RW075-STN16T	.75	.776	.803	.827	.850	.866	.906
K079TM1RW075-STN16N	.79	.815	.843	.866	.890	.906	.945
K087TM1RW100-STN16L	.87	.893	.921	.945	.969	.984	1.024
K102TM2RW100-STN16D	1.02	1.051	1.079	1.102	1.130	1.154	1.193
K118TM1RW100-STN27N	1.18	1.209	1.236	1.260	1.291	1.319	1.362	1.441	1.535	1.654	1.772	1.890
K146TM1RW125-STN27N	1.46	1.496	1.520	1.555	1.591	1.614	1.654	1.732	1.830	1.929	2.047	2.185
K165TM2RW125-STN27D	1.65	1.701	1.724	1.772	1.811	1.831	1.866	1.929	2.047	2.146	2.268	2.401
–	1.38 (UN)	–	–	–	–	–	–	–	–	–	1.969	–	1.843	–	1.756	–	2.228
–	1.38 (ISO)	–	–	–	–	–	–	–	–	–	1.969	2.102	1.673	1.969	–	2.264	–
–	1.38 (BSW)	–	–	–	–	–	–	–	–	–	1.961	–	1.831	–	1.866	–	–

UN-ISO-BSW

workpiece material	Cutting Speed vc SFM	feed rate per revolution (inch)
workpiece material	KC635M	feed rate per revolution (inch)
carbon steels 187 HB	300–700	.004–.008
carbon steels 187–220 HB	300–500	.004–.006
alloy steel 200–250 HB	200–425	.004–.006
alloy steel 250–325 HB	150–300	.004–.006
stainless steel, austenitic 210 HB	300–450	.004–.006
stainless steel, martensitic 321 HB	250–350	.002–.006
stainless steel, ferritic 245 HB	350–550	.002–.004
cast steel 140 HB	350–550	.002–.006
cast steel 220302 HB	225–425	.002–.004
titanium alloys	200–400	.001–.003
high-temperature (nickel and iron base)	75–150	.001–.002
high-temperature (cobalt base)	50–100	.001–.002
cast iron	250–350	.002–.006
malleable iron	250–400	.001–.003

workpiece material	Cutting Speed vc m/min	feed rate per revolution (mm)
workpiece material	KC635M	feed rate per revolution (mm)
carbon steels 187 HB	90–210	0,10–0,20
carbon steels 187–220 HB	90–150	0,10–0,15
alloy steel 200–250 HB	60–130	0,10–0,15
alloy steel 250–325 HB	50–90	0,10–0,15
stainless steel, austenitic 210 HB	90–140	0,10–0,15
stainless steel, martensitic 321 HB	80–110	0,05–0,15
stainless steel, ferritic 245 HB	110–170	0,05–0,10
cast steel 140 HB	110–170	0,05–0,15
cast steel 220302 HB	70–130	0,05–0,10
titanium alloys	60–120	0,03–0,08
high-temperature (nickel and iron base)	20–45	0,03–0,05
high-temperature (cobalt base)	15–30	0,03–0,05
cast iron	80–110	0,05–0,15
malleable iron	80–120	0,03–0,08

cutter	TPI	48	32	24	20	16	12	10	8	7	6	5.5	5	4.5	4.5	4	4
	pitch mm	0,5	0,75	1,0	1,25	1,5	2,0	2,5	3,0	3,5	4,0	4,5	5,0	5,5	–	6,0	–
	cutter diameter (D1 mm)	minimum bore diameter (D) (mm)
K035TM1RW050-STN10	8,89	9,50	10,01	10,69	11,40
K045TM1RW050-STN11N	11,43	11,99	12,50	13,21	13,89	14,50
K049TM1RW037LT11S	12,45	13,00	13,49	14,20	14,91	15,49
K061TM1RW062-STN16T	15,49	16,00	16,51	16,94	17,91	18,49	19,51
K067TM2RW075-STN11D	17,02	17,60	18,21	19,00	19,61	19,99	21,01
K075TM1RW075-STN16T	19,05	19,71	20,40	21,01	21,59	22,00	23,01
K079TM1RW075-STN16N	20,07	20,70	21,41	22,00	22,61	23,01	24,00
K087TM1RW100-STN16L	22,10	22,68	23,39	24,00	24,61	24,99	26,01
K102TM2RW100-STN16D	25,91	26,70	27,41	27,99	28,70	29,31	30,30
K118TM1RW100-STN27N	29,97	30,71	31,39	32,00	32,79	33,50	34,59	36,60	38,99	42,01	45,01	48,01
K146TM1RW125-STN27N	37,08	38,00	38,61	39,50	40,41	41,00	42,01	43,99	46,48	49,00	51,99	55,50
K165TM2RW125-STN27D	41,91	43,21	43,79	45,01	46,00	46,51	47,40	49,00	51,99	54,51	57,61	60,99
–	35,05 (UN)	–	–	–	–	–	–	–	–	–	50,01	–	46,81	–	44,60	–	56,59
–	35,05 (ISO)	–	–	–	–	–	–	–	–	–	50,01	53,39	42,49	50,01	–	57,51	–
–	35,05 (BSW)	–	–	–	–	–	–	–	–	–	49,81	–	46,51	–	47,40	–	–

1–2:	rapid approach
2–3:	tool entry along tangential arc with simultaneous feed along Z-axis
3–4:	helical movement during one full orbit (360°)
4–5:	tool exit along tangential arc with continuing feed along the Z-axis
5–6:	rapid return

1–2:	radial entry with simultaneous feed along the Z-axis
2–3:	helical movement during one full orbit (360°)
3–4:	radial exit


figure A	figure B


internal left hand thread threading tool workpiece	external thread workpiece threading tool	workpiece threading tool

Calculation of Feed Rates at the Cutting Edge

1–2:	radial entry
2–3:	helical movement during one full orbit (360°)
3–4:	radial exit

Radial Approach


internal thread	external thread

F₁ = fz x Z x n	RPM =	12 x SFM
		π x d₁
F₁=tool feed rate at the cutting edge (in/min) fz=inch per tooth (feed rate) Z=number of effective inserts in cutter n=rotational speed (spindle RPM)	SFM=cutting speed, surface feet per minute d₁=cutter diameter, over insert π=3.1416

P₁ = F₁ +	(F₁ x d₁)
	D	external thread	internal thread
P₁= program feed rate (in/min) D= major diameter (external thread) D= minor diameter (internal thread) d₁= cutting diameter, over insert		tool workpiece

Step-by-Step Thread Milling Example

pitch (TPI)	24	20	16	12
pitch mm	1,0	1,25	1,5	2,0
cutter dia. d₁	minimum bore diameter D
.67	.748	.772	.787	.827
.75	.827	.850	.866	.906
.79	.866	.890	.906	.945

Choosing Insert Size

insert IC	a inch (mm)	pitch (TPI)	internal thread	b inch thread length (in)	number of teeth	grade		external thread	b inch thread length (in)	number of teeth	grade		cutter type
insert IC	a inch (mm)	pitch (TPI)	catalog number	b inch thread length (in)	number of teeth	KC610M	KC620M	catalog number	b inch thread length (in)	number of teeth	KC610M	KC620M	cutter type
		32	STN16 32UN-I	.59	19			STN16 32UN-E	.59	19
		28	STN16 28UN-I	.57	16			STN16 28UN-E	.57	16
		27	STN16 27UN-I	.56	15			STN16 27UN-E	.56	15
		24	STN16 24UN-I	.55	14			STN16 24UN-E	.58	14
3/8	.63 (16)	20	STN16 20UN-I	.55	11			STN16 20UN-E	.55	11			STN16
		18	STN16 18UN-I	.56	10			STN16 18UN-E	.56	10
		16	STN16 16UN-I	.56	9			STN16 16UN-E	.56	9
		14	STN16 14UN-I	.57	8			STN16 14UN-E	.57	8
		13	STN16 13UN-I	.54	7			STN16 13UN-E	.54	7
		12	STN16 12UN-I	.58	7			STN16 12UN-E	.58	7

pitch (TPI)	24	20	16	12
pitch mm	1,0	1,25	1,5	2,0
cutter dia. d₁	minimum bore diameter D
17,02	19,00	19,61	19,99	21,01
19,05	21,01	21,59	22,00	23,01
20,07	22,00	22,61	23,01	24,00

insert IC	a (mm)	pitch (TPI)	internal thread	b thread length (mm)	number of teeth	grade		external thread	b thread length (mm)	number of teeth	grade		cutter type
insert IC	a (mm)	pitch (TPI)	catalog number	b thread length (mm)	number of teeth	KC610M	KC620M	catalog number	b thread length (mm)	number of teeth	KC610M	KC620M	cutter type
		32	STN16 32UN-I	14,99	19			STN16 32UN-E	14,99	19
		28	STN16 28UN-I	14,48	16			STN16 28UN-E	14,48	16
		27	STN16 27UN-I	14,22	15			STN16 27UN-E	14,22	15
		24	STN16 24UN-I	13,97	14			STN16 24UN-E	14,73	14
9,53	16	20	STN16 20UN-I	13,97	11			STN16 20UN-E	13,97	11			STN16
		18	STN16 18UN-I	14,22	10			STN16 18UN-E	14,22	10
		16	STN16 16UN-I	14,22	9			STN16 16UN-E	14,22	9
		14	STN16 14UN-I	14,48	8			STN16 14UN-E	14,48	8
		13	STN16 13UN-I	13,72	7			STN16 13UN-E	13,72	7
		12	STN16 12UN-I	14,73	7			STN16 12UN-E	14,73	7

Step-by-Step Thread Milling Example

Calculate the feed rates:
First, find the RPM.
RPM =	12 x SFM	=	12 x 500	=	2418 RPM
	π x d₁		3.14 x .79
Next, calculate the feed rate at the insert cutting edge (F₁):
(using the chosen feed per tooth of .004.)
F₁=	IPT x nt x RPM	=	.004 X 1 X 2418	=	9.67 in/min
Finally, calculate the feed rate at the cutter centerline (F₂):
F₂=	F₁ x (D - d₁)	=	9.67 x (1.182 - .79)	=	3.207 in/min
	D		1.182
Select the thread milling method.
Climb milling (preferred) see page .
Calculate the radius of the tangential arc R_e:
R_e =	(R_i - C_L)² + R₀²	=	(.591 - .02)² + .625²
	2R_o		2 x .625
R_e =	.573333 in.
Calculate the angle (β):
β =	90° + arc sin		R_o - R_e
			R_e
β =	90° + arc sin		.625 - .573333
			.57333
β =	90° + 5.17°	=	95.17°	=	95° 10'
Calculate the movement along the Z-axis during the entry approach from point “A” to point “B” (Zα). (NOTE: P = pitch)
Zα= P (in) x	α°	=	.0625	=	.0156 in, because α = 90°
	360°		4
Calculate the “X” and “Y” values at the start of the entry approach.
X = 0Y = -R_i+ C_L= -.591 + .02 = - .571 in.
Define Z-axis location at the start of the entry approach. (NOTE: L = length of thread)
Z = - (L + Zα) = - (.50 + .0156) = - .5156 in.
Define the starting point.
X_a = 0
Y_a = 0

CNC Program (Fanuc 11M)
%
N10G90G00G57X0.000Y0.000
N20G43H10Z0.M3S2417
N30G91G00X0.Y0.Z–0.5156
N40G41D60X0.000Y–0.5710Z0.
N50G03X0.6250Y0.5710Z0.0156R0.5733F3.206
N60G03X0.Y0.Z0.0625I–0.625J0.
N70G03X–0.625Y0.5710Z0.0156R0.5733
N80G00G40X0.Y–0.5710Z0.
N90G49G57G00Z8.0M5
N100M30
%
R_i=	D	Ro=	Do
	2		2
D = minor diameter		Do = nominal diameter
		α 90°

Calculate the feed rates:
First, find the RPM.
RPM =	1000 x Vc	=	1000 x 150	=	2387 RPM
	π x d₁		π x 20
Next, calculate the feed rate at the insert cutting edge (F₁):
(using the chosen feed per tooth of 0,1mm.)
F₁=	F_z x Z x N	=	0,1 X 1 X 2387	=	238,7 mm/min
Finally, calculate the feed rate at the cutter centerline (F₂):
F₂=	F₁ x (D - d₁)	=	238,7 x (3020)	=	79,57 mm/min
	D		30
Select the thread milling method.
Climb milling (preferred) see page .
Calculate the radius of the tangential arc R_e:
R_e =	(R_i - C_L)² + R_O²	=	(150,5)² + 15,875²
	2 x R_O		2 x 15,875
R_e =	14,55mm
Calculate the angle (β):
β =	90° + arc sin		R_o - R_e
			R_e
β =	90° + arc sin		15,875 - 14,55
			14,55
β =	90° + 5.17°	=	95,2°	=	95° 12'
Calculate the movement along the Z-axis during the entry approach from point “A” to point “B” (Zα). (NOTE: P = pitch)
Zα= P (mm) x	α°	=	1,578	=	0,394mm because α = 90°
	360°		4
Calculate the “X” and “Y” values at the start of the entry approach.
X = 0Y = R_i+ C_L= 15 + 0,5 = 15,5mm
Define Z-axis location at the start of the entry approach. (NOTE: L = length of thread)
Z = (L + Z_α) = 12,7 + 0,3945 = 13,0945mm
Define the starting point.
X_a = 0
Y_a = 0

Step-by-Step Thread Milling Example

Appendix A
Derivation of Formulas for Internal Thread Milling
R_e, β, and X can be found by a geometric analysis of the entry path.
This entry path is defined by the tool traveling along a circular path, with a radius of R_e about the point C.
R_e =	(R_i - C_L)² + R_o²
	2R_o
Triangle OAC enables us to simply solve for R_e.Note that OAC is a right angle triangle, and that:
OA = R_i – C_L CA = R_e OC = R_o – R_e
Pythagoras’ law states: OA² + OC² = AC²
Replacing actual values, we get:
(R_i - C_L)² + (R_o - R_e)²= R_e²
Simplifying, we get:
R_e =	(R_i - C_L)² + R_o²
	2R₀

Find the angle β.

sin
	= arc sin	(	R_o - R_e	)
			R_e
Therefore, β = 90° + arc sin		(	R_o - R_e	)
			R_e

Appendix B
Derivation of Formulas for External Thread Milling
R_e, β, and X can be found by a geometric analysis of the entry path.
This entry path is defined by the tool traveling along a circular path, with a radius of R_e about the point C.
R_e =	(R_o - C_L)² + R_i²
	2R_i
Triangle OAC enables us to simply solve for R_e.Note that OAC is a right angle triangle, and that:
OA = R_o – C_L CA = R_e OC = R_e – R_i
Pythagoras’ law states: OA² + OC² = AC²
Replacing actual values, we get:
(R_o - C_L)² + (R_e - R_i)²= R_e²
Simplifying, we get:
R_e =	(R_o - C_L)² + R_i²
	2R_i

Find the angle β.
β can be easily found using the same triangle:
sin β =	AO	=	(R_o + C_L)
	AC		R_e
β = arc sin	(	R_o + C_L	)
		R_e

problem	possible cause	solution
excessive insert flank wear	• Cutting speed too high.	• Reduce cutting speed.
	• Chip is too thin.	• Increase feed rate.
	• Insufficient coolant.	• Increase coolant quantity/pressure.
chipping of cutting edge	• Chip is too thick.	• Reduce feed rate. • Use the tangential arc method of entrance. • Increase RPM.
chipping of cutting edge	• Vibration.	• Check rigidity.
material build-up on the cutting edge	• Cutting speed too slow.	• Increase cutting speed.
material build-up on the cutting edge	• Chip thickness too small.	• Increase feed rate.
chatter/vibration	• Feed rate is too high.	• Reduce the feed.
	• Profile is too deep (coarse pitch threads).	• Execute two passes, each with increased cutting depth. • Execute two passes, each cutting only half the thread length.
	• Thread length is too long.	• Execute two passes, each cutting only half of the thread length.
insufficient thread accuracy	• Tool deflection.	• Reduce feed rate. • Execute a zero cut.

thread designation	standard designation	tolerance class
UN	ANSI B 1.174	2A/2B
UNJ	MIL-S-8879A	3A/3B
ISO	R262 (DIN 13)	6g/6H
NPT	USAS B2.1 : 1968	standard NPT
NPTF	ANSI B 1.20.3-1976	standard
BSW	B.S. 84 : 1956, DIN 259, ISO 228/1 : 1982	medium class A
BSPT	B.S. 21 : 1985	standard BSPT
ACME	ANSI B1/5 : 1988	3G
PG	DIN 40430	standard
TR	DIN 103	7e/7H

STN Series

Materials	Brinell	surface speeds		indexable inserts
steel	HB	KC610M	KC635M	feed fz (IPT)
P1	125	325–675	290–590	.002–.008
P2	180	290–550	290–520	.002–.008
P3	225	200–425	225–375	.002–.008
P4	250	250–490	250–500	.002–.008
P5	275	250–425	250–500	.002–.006
P6	325	225–350	200–325	.002–.004
stainless steel
M1	180	325–550	375–590	.002–.004
M2	250	225–450	325–450	.002–.004
M3	330	225–375	325–375	.002–.004
cast iron
K1	180	200–425	325–450	.001–.003
K2	220	200–390	250–325	.002–.006
K3	260	160–290	200–275	.002–.004
non-ferrous
N1	60–100	325–820	–	.002–.010
high-temp alloys
S1	200	65–140	65–130	.002–.004
S2	250	65–90	65–90	.001–.002
S3	280	50–65	50–65	.001–.002
S4	350	30–50	30–50	.001–.002
hardened steel
H1	55HRc	65–140	65–140	.0004–.001

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Inserts for TMS • Thread Milling • Internal • UN Thread

Indexable Inserts • Thread Profiles

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TM25 Inserts

Methods of External Thread Milling

Methods of Internal Thread Milling

Minimum Bore Diameters

UN-ISO-BSW

Calculation of Feed Rates at the Cutting Edge

Radial Approach

Step-by-Step Thread Milling Example

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Step-by-Step Thread Milling Example

Step-by-Step Thread Milling Example

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Inserts for TMS • Thread Milling • Internal • UN Thread

Indexable Inserts • Thread Profiles

Features and benefits

Workpiece Materials

Grades

TM25 Inserts

Methods of External Thread Milling

Methods of Internal Thread Milling

Minimum Bore Diameters

UN-ISO-BSW

Calculation of Feed Rates at the Cutting Edge

Radial Approach

Step-by-Step Thread Milling Example

Choosing Insert Size

Step-by-Step Thread Milling Example

Step-by-Step Thread Milling Example

STN Series

Support

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⤓ NOVO App

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