Indexable Cutting Tools - Indexable Milling Products For Sale | Exact Tooling - (16232 Products)
Kennametal - 10" Cut Diam, 2-1/2" Arbor Hole, 5.5mm Max Depth of Cut, 46.5° Indexable Chamfer & Angle Face Mill - 12 Inserts, ON.X080608.. Insert, Right Hand Cut, 12 Flutes, Series MILL 16
Item #: 49081623
Brand: Kennametal
Model #: 6159082
Exact Tooling IR#: 04
Product Specifications
Cutting Diameter (Inch)
10
Cutting Diameter (mm)
254.01
Cutting Diameter (Decimal Inch)
10.0000
Arbor Hole Diameter (mm)
63.50
Arbor Hole Diameter (Inch)
2-1/2
Arbor Hole Diameter (Decimal Inch)
2.5000
Lead Angle
46.5
Overall Height (mm)
61.00
Insert Compatibility
ON.X080608..
Series
MILL 16
Through Coolant
No
Maximum Depth of Cut (mm)
5.50
Maximum Depth of Cut (Decimal Inch)
0.2200
Number of Cutter Inserts
12
Number of Flutes
12
Hub Diameter (mm)
140.00
Maximum RPM
5200
Cutting Direction
Right Hand
Toolholder Material
Steel
Overall Length (mm)
61.00
Number of Flutes
12
Maximum RPM
5200
Maximum Cutting Diameter (mm)
266.00
Iscar - 32mm Cut Diam, 18mm Max Depth of Cut, 32mm Shank Diam, 210mm OAL, Indexable Square Shoulder End Mill - P290 AC.T 1806.. Inserts, Cylindrical Shank, 0° Lead Angle, Through Coolant, Series MillShred
Item #: 30709125
Brand: Iscar
Model #: 3110790
Exact Tooling IR#: 04
Product Specifications
Cutting Diameter (mm)
32.00
Cutting Diameter (Decimal Inch)
1.2598
Shank Type
Cylindrical
Shank Diameter (mm)
32.00
Shank Diameter (Decimal Inch)
1.2598
Overall Length/Projection (mm)
210.00
Overall Length/Projection (Decimal Inch)
8.2677
Lead Angle
0
Series
MillShred
Through Coolant
Coolant Through
Maximum Depth of Cut (mm)
18.00
Maximum Depth of Cut (Decimal Inch)
0.7087
Number of Cutter Inserts
3
Insert Holding Method
Screw
End Mill Type
End Mill
Cutter Style
P290 EPW
Head Length (mm)
130.00
Head Length (Decimal Inch)
5.1181
Weldon Flat
No
Insert Compatibility
P290 AC.T 1806..
Shank Length (Decimal Inch)
3.1496
Shank Length (mm)
80.00
Sandvik Coromant - Arbor Connection, 0.315" Cutting Width, 2" Depth of Cut, 200mm Cutter Diam, 1.5748" Hole Diam, Indexable Slotting Cutter - 1.5748" Shank Diam, Right Hand Cutting Direction
Item #: 49522121
Brand: Sandvik Coromant
Model #: 6448912
Exact Tooling IR#: 04
Product Specifications
Connection Type
Arbor
Cutting Width (mm)
8.00
Cutting Width (Decimal Inch)
0.3150
Cutting Width (Decimal Inch)
0.314961
Cutting Width (mm)
8
Maximum Depth of Cut (mm)
51.00
Maximum Depth of Cut (Decimal Inch)
2.0079
Maximum Depth of Cut (Decimal Inch)
2.0079
Maximum Depth of Cut (mm)
51
Cutter Diameter (mm)
200.00
Cutter Diameter (Decimal Inch)
7.8740
Hole Diameter (mm)
40.00
Hole Diameter (Decimal Inch)
1.5748
Shank Diameter (mm)
40.00
Shank Diameter (Decimal Inch)
1.5748
Modular Connection Size
40S
Series
CoroMill 331
Number of Cutter Inserts
16
Cutting Direction
Right Hand
Cutting Direction
Right Hand
Insert Holding Method
Screw
Insert Holding Method
Screw
Maximum RPM
9100
Maximum RPM
9100
Minimum Cutting Width (Decimal Inch)
0.3150
Maximum Cutting Width (Decimal Inch)
0.3937
Maximum Cutting Width (mm)
10.00
Maximum Cutting Width (Decimal Inch)
0.393701
Maximum Cutting Width (mm)
10
Hub Diameter (mm)
96.00
Hub Diameter (Decimal Inch)
3.7795
Hub Diameter (mm)
96.00
Hub Diameter (Decimal Inch)
3.7795
Keyway Width (Decimal Inch)
0.6457
Keyway Width (mm)
16.40
Keyway Width (Decimal Inch)
0.6457
Lead Angle
90
Maximum Body Diameter (Decimal Inch)
7.8740
Through Coolant
No
Complete Insert Compatibility1
N331.1A-05
Kyocera - 80mm Cut Diam, 6mm Max Depth of Cut, 45° Indexable Chamfer & Angle Face Mill - 5 Inserts, PN.U 1205 Insert, Right Hand Cut, 5 Flutes, Series MFPN
Item #: 50421106
Brand: Kyocera
Model #: 8835299
Exact Tooling IR#: 04
Product Specifications
Cutting Diameter (Inch)
0
Cutting Diameter (mm)
80.00
Cutting Diameter (Decimal Inch)
3.1496
Arbor Hole Diameter (Inch)
0
Lead Angle
45
Overall Height (Decimal Inch)
4.330709
Overall Height (mm)
110
Insert Compatibility
PN.U 1205
Series
MFPN
Through Coolant
No
Maximum Depth of Cut (mm)
6.00
Maximum Depth of Cut (Decimal Inch)
0.2362 (GM/SM/GH); 0.1969 (GL); 0.1181 (W)
Number of Cutter Inserts
5
Insert Holding Method
Screw
Cutter Style
MFPN
Number of Flutes
5
Cutting Rake Angle
-8
Rake
Negative
Cutting Direction
Right Hand
Complete Insert Compatibility
PNEU 1205ANER-GL; PNEU 1205ANER-W; PNMU 1205ANER-GH; PNMU 1205ANER-GM; PNMU 1205ANER-SM
Iscar - Multimaster 3/8" 90° Shank Milling Tip Insert Holder & Shank - 3/8" Neck Diam, T06 Neck Thread, 3-1/4" OAL, Steel MM S-A-L3 Tool Holder
Item #: 76531029
Brand: Iscar
Model #: 3103222
Exact Tooling IR#: 04
Product Specifications
Series
Multimaster
Shank Type
90 Degree Shank
Shank Diameter (Decimal Inch)
0.3750
Neck Diameter (Decimal Inch)
0.3750
Neck Thread Size
T06
Toolholder Material
Steel
Overall Length (Decimal Inch)
3.2500
Through Coolant
NonThrough Coolant
Weldon Flat
Yes
Shank Shape
Straight
Toolholder Style
MM S-A-L3
Cutting Tool Technologies - Shank Connection, 5/32" Cutting Width, 0.87" Depth of Cut, 3" Cutter Diam, Indexable Slotting Cutter - 1-1/4" Shank Diam, RT Toolholder, RDC(1.25)(1.5) Insert
Item #: 86975828
Brand: Cutting Tool Technologies
Model #: RT-060
Exact Tooling IR#: 04
Product Specifications
Connection Type
Shank
Cutting Width (Decimal Inch)
0.1563
Cutting Width (Inch)
5/32
Maximum Depth of Cut (Decimal Inch)
0.8700
Cutter Diameter (Decimal Inch)
3.0000
Cutter Diameter (Inch)
3
Shank Diameter (Inch)
1-1/4
Shank Diameter (Decimal Inch)
1.2500
Toolholder Style
RT
Series
RT
Insert Style
RDC(1.25)(1.5)
Number of Cutter Inserts
8
Insert Holding Method
Wedge
Radius
Yes
Cutting Radius (Inch)
5/64
Rake
Positive
Weldon Flat
Yes
Iscar - 64.8mm Cut Diam, 22mm Arbor Hole, 7.15mm Max Depth of Cut, 45° Indexable Chamfer & Angle Face Mill - 5 Inserts, S845 SX.U 16.. Insert, Right Hand Cut, 5 Flutes, Through Coolant, Series Helido
Item #: 91123356
Brand: Iscar
Model #: 3105052
Exact Tooling IR#: 04
Product Specifications
Cutting Diameter (mm)
64.80
Arbor Hole Diameter (mm)
22.00
Lead Angle
45
Overall Height (mm)
45.00
Insert Compatibility
S845 SX.U 16..
Series
Helido
Through Coolant
Yes
Maximum Depth of Cut (mm)
7.15
Number of Cutter Inserts
5
Insert Holding Method
Screw
Cutter Style
S845 F45SX-16
Number of Flutes
5
Keyway Width (mm)
10.40
Maximum Body Diameter (Decimal Inch)
2.5510
Cutting Direction
Right Hand
Maximum Insert Radius (Decimal Inch)
0.0310
Counterbore Diameter (Decimal Inch)
0.7090
Complete Insert Compatibility
S845 SXHU 1606-W; S845 SXMU/SXCU-16
Seco - Shell Mount Connection, 0.2953" Cutting Width, 2.0866" Depth of Cut, 200mm Cutter Diam, 1.5748" Hole Diam, 14 Tooth Indexable Slotting Cutter - R335.18 Toolholder, LNK. 08.. Insert, Left Hand Cutting Direction
Item #: 53095691
Brand: Seco
Model #: 59062
Exact Tooling IR#: 04
Product Specifications
Connection Type
Shell Mount
Cutting Width (mm)
7.50
Cutting Width (Decimal Inch)
0.2953
Maximum Depth of Cut (mm)
53.00
Maximum Depth of Cut (Decimal Inch)
2.0866
Cutter Diameter (mm)
200.00
Cutter Diameter (Decimal Inch)
7.8740
Hole Diameter (mm)
40.00
Hole Diameter (Decimal Inch)
1.5748
Number of Teeth
14
Toolholder Style
R335.18
Series
R335.18
Insert Style
LNK. 08..
Staggered Tooth
Yes
Number of Cutter Inserts
14
Cutting Direction
Left Hand
Insert Holding Method
Screw
Maximum RPM
6700
Hub Diameter (mm)
90.00
Hub Diameter (Decimal Inch)
3.5433
Keyway Width (Decimal Inch)
0.3937
Keyway Width (mm)
10.00
Radius
No
Cutter Body Width (mm)
38.00
Cutter Body Width (Decimal Inch)
1.4961
Weldon Flat
No
Manufacturers Catalog Number
R335.18-200.1215XL.40-14L
Complete Insert Compatibility1
LNK.08-F40M-M06; LNK.08-H25-E05; LNK.08-MK1500-M06; LNK.08-MK1500-MD08; LNK.08-MK2050-M06; LNK.08-MK2050-MD08; LNK.08-MM4500-M06; LNK.08-MP2500-M06; LNK.08-MP2500-MD08; LNK.08-MP3000-M06; LNK.08-MP3000-MD08; LNK.08-T350M-M06
Seco - Shank Connection, 5/16" Cutting Width, 0.41" Depth of Cut, 1-1/2" Cutter Diam, 2 Tooth Indexable Slotting Cutter - 3/4" Shank Diam, R335.18 Toolholder, LNK.. 05.. Insert, Right Hand Cutting Direction
Item #: 84761857
Brand: Seco
Model #: 29097
Exact Tooling IR#: 04
Product Specifications
Connection Type
Shank
Cutting Width (Decimal Inch)
0.3120
Maximum Depth of Cut (Decimal Inch)
0.4100
Cutter Diameter (Decimal Inch)
1.5000
Shank Diameter (Decimal Inch)
0.7500
Number of Teeth
2
Toolholder Style
R335.18
Series
R335.18
Insert Style
LNK.. 05..
Staggered Tooth
Yes
Number of Cutter Inserts
4
Cutting Direction
Right Hand
Insert Holding Method
Screw
Maximum RPM
15400
Minimum Cutting Width (Decimal Inch)
0.3120
Maximum Cutting Width (Decimal Inch)
0.3120
Radius
No
Shank Length (Decimal Inch)
4.4200
Weldon Flat
No
Complete Insert Compatibility1
LNKT 050404PPN4-E05; LNKT 050404PPTN4-M06; LNKT 050408PPN4-E05; LNKT 050408PPTN4-M06; LNKT 050416PPTN4-M06; LNKT 050420PPTN4-M06; LNKT 050424PPTN2-M06; LNKT 050431PPTL1-M06; LNKT 050431PPTR1-M06; LNKW 050404PPN4-MD07; LNKW 050408PPN4-MD07
Seco - 3/4" Cut Diam, 0.433" Max Depth of Cut, 3/4" Shank Diam, 3.38" OAL, Indexable Square Shoulder End Mill - XO.X 1204.. Inserts, Weldon Shank, 90° Lead Angle, Through Coolant, Series Super Turbo
Item #: 93761104
Brand: Seco
Model #: 40924
Exact Tooling IR#: 04
Product Specifications
Cutting Diameter (Decimal Inch)
0.7500
Cutting Diameter (Inch)
3/4
Shank Type
Weldon
Shank Diameter (Inch)
3/4
Shank Diameter (Decimal Inch)
0.7500
Overall Length/Projection (Decimal Inch)
3.3800
Lead Angle
90
Series
Super Turbo
Through Coolant
Coolant Through
Maximum Depth of Cut (Decimal Inch)
0.4330
Number of Cutter Inserts
2
Insert Holding Method
Screw
End Mill Type
End Mill
Cutter Style
R217.69-12A
Number of Flutes
2
Head Length (Decimal Inch)
1.1700
Weldon Flat
Yes
Insert Compatibility
XO.X 1204..
Shank Length (Decimal Inch)
2.2000
Maximum RPM
23200
Iscar - 40mm Cut Diam, 15mm Max Depth of Cut, Indexable Square Shoulder End Mill - HM90 AXCR 1505.. Inserts, HSK63A Taper Shank, 90° Lead Angle, Through Coolant, Series Helialu
Item #: 91150144
Brand: Iscar
Model #: 3103170
Exact Tooling IR#: 04
Product Specifications
Cutting Diameter (mm)
40.00
Shank Type
Taper Shank
Shank Taper Size
HSK63A
Lead Angle
90
Series
Helialu
Through Coolant
Coolant Through
Maximum Depth of Cut (mm)
15.00
Number of Cutter Inserts
3
Insert Holding Method
Screw
End Mill Type
End Mill
Cutter Style
HM90 EAL-HSK63A-15
Number of Flutes
3
Head Length (mm)
146.00
Insert Compatibility
HM90 AXCR 1505..
Maximum RPM
26040
Kennametal - 63.9mm Cut Diam, 22mm Arbor Hole, 6.6mm Max Depth of Cut, 45° Indexable Chamfer & Angle Face Mill - 4 Inserts, SECX-EN GN\xB6SECX-GD2\xB6SECX-SN GN Insert, Right Hand Cut, 4 Flutes, Through Coolant, Series Beyond Blast KSSM
Item #: 42689323
Brand: Kennametal
Model #: 4137779
Exact Tooling IR#: 04
Product Specifications
Cutting Diameter (mm)
63.90
Cutting Diameter (Decimal Inch)
2.5157
Arbor Hole Diameter (mm)
22.00
Arbor Hole Diameter (Decimal Inch)
0.8661
Lead Angle
45
Overall Height (Decimal Inch)
1.5748
Overall Height (mm)
40.00
Insert Compatibility
SECX-EN GN; SECX-GD2; SECX-SN GN
Series
Beyond Blast KSSM
Through Coolant
Yes
Maximum Depth of Cut (mm)
6.60
Maximum Depth of Cut (Decimal Inch)
0.2598
Number of Cutter Inserts
4
Insert Holding Method
Screw
Number of Flutes
4
Maximum Body Diameter (Decimal Inch)
1.9685
Maximum RPM
18400
Cutting Direction
Right Hand
Sandvik Coromant - CoroMill 327 5/8" Weldon Shank Milling Tip Insert Holder & Shank - 4.8916" Projection, 0.354" Neck Diam, 0.354" Nose Diam, 4.8916" OAL, Carbide A327-xxB Tool Holder
Item #: 49335490
Brand: Sandvik Coromant
Model #: 5722460
Exact Tooling IR#: 04Features and Benefits
Product Specifications
Series
CoroMill 327
Shank Type
Weldon Shank
Shank Diameter (Decimal Inch)
0.6250
Projection (Decimal Inch)
4.8916
Neck Diameter (Decimal Inch)
0.3540
Nose Diameter (Decimal Inch)
0.3540
Toolholder Material
Carbide
Overall Length (Decimal Inch)
4.8916
Through Coolant
Through Coolant
Weldon Flat
Yes
Head Length (Decimal Inch)
2.2936
Maximum Diameter (Decimal Inch)
0.3540
Shank Material
Carbide
Toolholder Style
A327-xxB
Iscar - 339.5mm Cut Diam, 60mm Arbor Hole, 7mm Max Depth of Cut, 45° Indexable Chamfer & Angle Face Mill - 14 Inserts, ONMU 1008\xB6S845 SNMU 2608 Insert, Right Hand Cut, 14 Flutes, Series Helido
Item #: 91121376
Brand: Iscar
Model #: 3106729
Exact Tooling IR#: 04
Product Specifications
Cutting Diameter (mm)
339.50
Arbor Hole Diameter (mm)
60.00
Lead Angle
45
Overall Height (mm)
77.80
Insert Compatibility
ONMU 1008; S845 SNMU 2608
Series
Helido
Through Coolant
No
Maximum Depth of Cut (mm)
7.00
Number of Cutter Inserts
14
Insert Holding Method
Screw
Cutter Style
SOF45-26
Number of Flutes
14
Hub Diameter (mm)
220.00
Keyway Width (mm)
25.70
Cutting Direction
Right Hand
Maximum Insert Radius (Decimal Inch)
0.0630
Counterbore Diameter (Decimal Inch)
3.5430
Complete Insert Compatibility
ONMU 1008; S845 SNMU 2608
Tool-Flo - TFM 5/8" Straight Shank Milling Tip Insert Holder & Shank - 5.12" OAL, TFM Tool Holder
Item #: 40767030
Brand: Tool-Flo
Model #: 9CMI7625236
Exact Tooling IR#: 04Features and Benefits
Product Specifications
Series
TFM
Shank Type
Straight Shank
Shank Diameter (Decimal Inch)
0.6250
Overall Length (Decimal Inch)
5.1200
Through Coolant
Through Coolant
Head Length (Decimal Inch)
2.6300
Maximum Diameter (Decimal Inch)
0.8540
Shank Shape
Round
Toolholder Style
TFM
Iscar - Arbor Hole Connection, 3mm Cutting Width, 10mm Depth of Cut, 50mm Cutter Diam, 8mm Hole Diam, 4 Tooth Indexable Slotting Cutter - TGSF Toolholder, TAG Insert, Right Hand Cutting Direction
Item #: 45387321
Brand: Iscar
Model #: 2302421
Exact Tooling IR#: 04
Product Specifications
Connection Type
Arbor Hole
Cutting Width (mm)
3.00
Maximum Depth of Cut (mm)
10.00
Cutter Diameter (mm)
50.00
Hole Diameter (mm)
8.00
Number of Teeth
4
Toolholder Style
TGSF
Series
TangSlit(TGSF)
Insert Style
TAG
Staggered Tooth
No
Number of Cutter Inserts
4
Cutting Direction
Right Hand
Insert Holding Method
Clamp
Maximum RPM
6300
Cutting Radius (Inch)
1/64
Cutter Body Width (mm)
2.50
Complete Insert Compatibility1
TAG N2A; TAG N2C; TAG N2J; TAG N2JS; TAG N2JT; TAG N2LF; TAG N2UT
Sumitomo - 125mm Cut Diam, 1/2" Arbor Hole, 50mm Max Depth of Cut, 90° Indexable Chamfer & Angle Face Mill - 10 Inserts, NF-LDEN Insert, Right Hand Cut, 10 Flutes, Through Coolant, Series HF
Item #: 55720437
Brand: Sumitomo
Model #: 2S00022
Exact Tooling IR#: 04Features and Benefits
Product Specifications
Cutting Diameter (mm)
125.00
Cutting Diameter (Decimal Inch)
4.9200
Arbor Hole Diameter (Inch)
1/2
Arbor Hole Diameter (Decimal Inch)
0.5000
Lead Angle
90
Overall Height (mm)
50.00
Insert Compatibility
NF-LDEN
Series
HF
Through Coolant
Yes
Maximum Depth of Cut (mm)
50.00
Number of Cutter Inserts
10
Insert Holding Method
Screw/Clamp
Cutter Style
HFM
Number of Flutes
10
Maximum Body Diameter (Decimal Inch)
4.0200
Maximum RPM
7500
Cutting Direction
Right Hand
Complete Insert Compatibility
NF-LDEN12T3ZD
Through Coolant
Through Coolant
Shank Type
Straight Shank
Weldon Flat
No
Seco - Arbor Hole Connection, 0.1614" Cutting Width, 3.327" Depth of Cut, 250mm Cutter Diam, 1.5748" Hole Diam, 18 Tooth Indexable Slotting Cutter - 335.10 Toolholder, 150.10-4N Insert
Item #: 60157625
Brand: Seco
Model #: 28689
Exact Tooling IR#: 04
Product Specifications
Connection Type
Arbor Hole
Cutting Width (mm)
4.10
Cutting Width (Decimal Inch)
0.1614
Maximum Depth of Cut (mm)
84.51
Maximum Depth of Cut (Decimal Inch)
3.3270
Cutter Diameter (mm)
250.00
Cutter Diameter (Decimal Inch)
9.8425
Hole Diameter (mm)
40.00
Hole Diameter (Decimal Inch)
1.5748
Number of Teeth
18
Toolholder Style
335.10
Series
335.10
Insert Style
150.10-4N
Staggered Tooth
No
Number of Cutter Inserts
18
Insert Holding Method
Self Clamping
Maximum RPM
2000
Minimum Cutting Width (Decimal Inch)
0.1614
Maximum Cutting Width (Decimal Inch)
0.1614
Maximum Cutting Width (mm)
4.10
Hub Diameter (mm)
40.00
Hub Diameter (Decimal Inch)
1.5748
Radius
No
Rake
Positive
Complete Insert Compatibility1
150.10-4N-16; 150.10-4N-14; 150.10-4N-12
Kennametal - 40mm Cut Diam, 15.5mm Max Depth of Cut, 32mm Shank Diam, 111mm OAL, Indexable Square Shoulder End Mill - LNGU15T608SRGE Inserts, Weldon Shank, 0° Lead Angle, Through Coolant, Series MILL 4-15
Item #: 37640034
Brand: Kennametal
Model #: 5555607
Exact Tooling IR#: 04
Product Specifications
Cutting Diameter (mm)
40.00
Cutting Diameter (Decimal Inch)
1.5750
Shank Type
Weldon
Shank Diameter (mm)
32.00
Shank Diameter (Decimal Inch)
1.2600
Overall Length/Projection (mm)
111.00
Lead Angle
0
Series
MILL 4-15
Through Coolant
Coolant Through
Maximum Depth of Cut (mm)
15.50
Maximum Depth of Cut (Decimal Inch)
0.6100
Number of Cutter Inserts
4
Insert Holding Method
Screw
End Mill Type
End Mill
Number of Flutes
4
Minimum Cutting Diameter (mm)
40.00
Minimum Cutting Diameter (Decimal Inch)
1.5750
Head Length (mm)
50.00
Head Length (Decimal Inch)
1.9680
Weldon Flat
Yes
Insert Compatibility
LNGU15T608SRGE
Shank Length (Decimal Inch)
2.4020
Shank Length (mm)
61.00
Maximum RPM
18800
Toolholder Material
Steel
Coolant Hole Diameter (mm)
4.00
Coolant Hole Diameter (Decimal Inch)
0.1570
Iscar - Multimaster 16mm 90° Shank Milling Tip Insert Holder & Shank - T10 Neck Thread, 100mm OAL, Steel MM S-A Tool Holder
Item #: 45383924
Brand: Iscar
Model #: 3106138
Exact Tooling IR#: 04
Product Specifications
Series
Multimaster
Shank Type
90 Degree Shank
Shank Diameter (mm)
16.00
Shank Diameter (Decimal Inch)
0.6300
Neck Thread Size
T10
Toolholder Material
Steel
Overall Length (mm)
100.00
Overall Length (Decimal Inch)
3.9370
Through Coolant
Through Coolant
Weldon Flat
No
Head Length (Decimal Inch)
1.5830
Effective Length (mm)
42.00
Effective Length (Decimal Inch)
1.6535
Milling Tip Style
BCM-MM, HCE-MM, HCM-MM, HM90 E90A-MM-10, HP E90AN-MM-07, MM EB, MM EC-4, MM HBR, MM HCD, MM HCR
Shank Shape
Straight
Toolholder Style
MM S-A