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ICONLEGEND & DESCRIPTION
Incl
i-na
tion
High SpeedSteel
5% CobaltHigh Speed Steel
8% CobaltHigh Speed Steel
8% Cobalt HSS,Eccentric ReliefSharpening
3% VanadiumHigh Speed Steel
9-10% Cobalt,0.2-0.8 µm Grain size.
Steam (HOMO)Temper No Surface Treatment
Titanium AluminiumNitride (Black Finish)
Titanium Nitride(Gold Finish)
TiN Coated for alength of 4 x diameter
Steam (HOMO)TemperStraw Colour
Type NStandard
Type WFor Soft Materials
Type HFor Hard Materials
Colour BandApplication
Staggered Teeth Side& Face Cutters
StraightTeeth Side & FaceCutters
Fine Pitch KnuckleType Roughing Profile
Coarse Pitch KnuckleType Roughing Profile
ISO Standard 529 DIN Standard 371 FactorySpecifications
Refined Flute Quick Spiral Reamer to produceH7 Tolerance
Flatted Shankh6 Tolerance
Plain Shankh7 Tolerance
Threaded Shankh8 Tolerance
Carbide Plain Shankh6 Tolerance
Morse TaperShank
Drill PointAngles
CountersinkAngles
DrillsStub Series
DrillsJobber Series
DrillsLong Series
DrillsExtra Length Series
SSH SSH SSH SSHHSS SSH SSH SSH SSHHSS5oC 5oC 5oC 5oCCo5SSH SSH SSH SSHHSS8oC 8oC 8oC 8oCCo8
ESSH ESSH ESSH ESSHHSSE3V3V3V3VV3
DILOS* DILOS* DILOS* DILOS**SOLIDCARBIDECARBIDECARBIDECARBIDECARBIDE
SSH SSH SSH SSHHSSe8oC e8oC e8oC e8oCCo8e
EULB EULB EULB EULBBLUEHSINIF HSINIF HSINIF HSINIFFINISH
THGIRB THGIRB THGIRB THGIRBBRIGHTHSINIF HSINIF HSINIF HSINIFFINISH
NlAiT NlAiT NlAiT NlAiTTiAlN NiT NiT NiT NiTTiN
THGIRB THGIRB THGIRB THGIRBBRIGHTHSINIF HSINIF HSINIF HSINIFFINISH
HTIW HTIW HTIW HTIWWITHPIT NiT PIT NiT PIT NiT PIT NiTTiN TIP
DLOG DLOG DLOG DLOGGOLDEDIXO EDIXO EDIXO EDIXOOXIDE
EPYT EPYT EPYT EPYTTYPEN
EPYT EPYT EPYT EPYTTYPEH
ABC ABC ABC ABCCBA
EPYT EPYT EPYT EPYTTYPEW
OSI OSI OSI OSIISO925 925 925 925529
NID NID NID NIDDIN173 173 173 173371
FRFRFRFRRF SQSQSQSQQS
SKROW SKROW SKROW SKROWWORKS.DTS .DTS .DTS .DTSSTD.
7 H 7 H 7 H 7 HH 7
MT 3 - 5
Carbon SteelNOBRAC NOBRAC NOBRAC NOBRACCARBONLEETS LEETS LEETS LEETSSTEEL
TiALN suitedto Solid Carbide(Violet -grey Finish)
X.TREMEX.TREMEX.TREMEX.TREMEX.TREME
Parabolic FluteStrong Core
EPYT EPYT EPYT EPYTTYPESFSFSFSFFS
Coarse Pitch FlatCrest Rough Semi-finishing Profile
Fine Pitch Flat CrestRough Semi-finishing Profile
Mat
eria
lFi
nish
Type
End MillsRegular Series
End MillsLong Series
Mill
ing
Pro�
leSt
anda
rdSh
ank
Poin
t Ang
leLe
ngth
sFl
ute
Hel
ix A
ngle
Cent
reD
rills
Continued on next page...
Left handhelix
Right handhelix
Form AStandard
Form BProtected
Form RRadius
To Suit 1 in10 Taper
To Suit 1 in50 Taper
To Suit 1 in 48Taper
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Thre
ads
Tole
ranc
e
Direction ofCut
Taper, Through& Blind Hole
Through &Blind Hole Blind Hole Tapping Through Hole Tapping
Left HandCutting
Right HandCutting Hand Taps
Metric Metric Fine British StandardWhitworth
British StandardWhitworthFine
Unified NationalCoarse
Unified NationalFine
British Standard PipeTaper “F” Series
British Standard Pipe(Fine) “G” Series
National PipeStraight
National PipeTaper
BritishAssociation
Thread Form - with47½°/55°/60° flankangle
WoodruffTolerance
Corner RoundingTolerance
PSB PSB PSB PSBBSP
BSB BSB BSB BSBBSBSPN SPN SPN SPNNPS
FMFMFMFMMFM MM MM WSB WSB WSB WSBBSW FSB FSB FSB FSBBSF
CNU CNU CNU CNUUNC FNU FNU FNU FNUUNF TPSB TPSB TPSB TPSBBSPT
TPN TPN TPN TPNNPT ABABABABBA British StandardBrass
Tolerance oncutting Diameter
App
licat
ion
GENERALMATERIAL DESCRIPTIONS
Code 0 Code 1 Code 2 Code 3 Code 4 Code 5 Code 7
Free Cutting SteelsCarbon SteelAlloy Steel
Stainless Steel
Heat Resisting Alloys
Nimonic Alloys
Titanium
Tool Steel
Cast Irons
Nickel
Manganese Steels
Aluminium AlloysMagnesium AlloysZinc Alloys
Copper
Synthetics / Plastics
xxx
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x
x
x
xxx
x
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x
xx
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xxx
x
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xx
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xxx
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x
x
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x
xxx
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x
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xxx
x
x
xxx
x
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x
x
x
xxx
x
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x
x
x
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xxx
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Materials
ICONLEGEND & DESCRIPTION
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THREADINGTOOLS
Suited MaterialsCARBON
STEEL
FREE CUTTING STEEL
CAST IRON COPPER
Suited MaterialsCARBON
STEEL
FREE CUTTING STEEL
CAST IRON COPPER
Green Band Spiral Flute Taps for tapping Carbon Steels
Green Band Spiral Flute Taps for tapping Carbon Steels
TiNTiNTiNTiNTiN
TiNTiNTiNTiNTiN
DINDINDINDINDIN371371371371371
CBACBACBACBACBA
HSSEHSSEHSSEHSSEHSSEV3V3V3V3V3
563
MMMMM
Properties
Code
CBACBACBACBACBA
HSSEHSSEHSSEHSSEHSSEV3V3V3V3V3
568
MMMMM
Properties
Code
DINDINDINDINDIN376376376376376
5630300563040056305005630600563070056308005631000
2.73.44.94.95.56.28
M3M4M5M6M7M8M10
0.50.70.81.01.01.251.5
566370808090100
5781010
12.515
3.54.56.06.07.08.010.0
I2 edoChctiPeziS d1I1 a No. ofFlutes3333333
2.12.12.73.44.95.57991112
14.514.5
2.52.83.54.56.07.09.011.012.014.016.018.018.0
67810
12.515
17.5202025252530
5663708090
100110110110125140140160
M3.5M4M5M6M8M10M12M14M16M18M20M22M24
0.60.70.81.01.251.51.752.02.02.52.52.53.0
5680350568040056805005680600568080056810005681200568140056816005681800568200056822005682400
I2 edoChctiPeziS d1I1 a No. ofFlutes3333333334444
ISO 26H
ISO 26H
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STRAIGHTSHANK DRILLS
Drill Terminology
TANG
MORSE TAPERSHANK
RECESS
OVERALLLENGTH
BODYLENGTH
FLUTELENGTH
DIAMETER
HELIXANGLE
SHANKLENGTH
BODYCLEARANCEDIAMETER WEB
THICK-NESS
CIRCULARLAND
FLANK
CHISELEDGE
LIPLENGTH
POINTANGLE
LIPCLEARANCE
ANGLE
DETAILED VIEW OF LIP CLEARANCE
CHISELANGLE
HEEL
POINT
SLOW
STANDARD
QUICK
TYPES OF SPIRAL (OR HELIX) ANGLES
Note : Selecting the correct DrillRefer to the User Guide for detailed information.
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STRAIGHTSHANK DRILLS
DRILL POINT STYLES
118° 130°
130° 118° 70°
Standard Point Split PointDin 1412 Form C
“UX Point”DIN 1412 TYPE B
Cast Iron Point“DX Point”
DIN 1412 TYPE D
Benefits of the Parabolic Flute Form
Heavy web construction increases rigidity under torsional load thus eliminating chatter at the cutting edgeswhich cause edge break down and early failure. The Parabolic drill web is 50-90% thicker than the standarddrill, depending on drill diameter.
Wider flute form, together with quicker spiral, promotes better chip removal while allowing easier coolant flowto the drill point.
FLUTE FORMS
Conventional Web Parabolic Flute FormThicker Web
Chipbreaker
DIN 1412 TYPE A
Drill Terminology
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STANDARD MORSE TAPER SHANKTo I.S.O. 296 DIN228 BS1660
No.of
Taper
Fittingline
DiameterD
Diameterd
OverallLength
MaxL
D 1 a MaxL1
Maxe
H13b
Maxd1
Taper /mm
on DiaMax
R
123456
12.06517.78023.82531.26744.39963.348
9.014.019.025.036.052.0
65.580.099.0124.0156.0218.0
12.218.024.131.644.763.8
3.55.05.06.56.58.0
62.075.094.0117.5149.5210.0
13.516.020.024.029.040.0
5.26.37.911.915.919.0
8.713.518.524.535.751.0
5.06.07.08.010.013.0
0.049980.049950.050200.051940.052630.05214
d b
R
e
D
aL1
D1 d1
L
HOW TO ORDER SPECIALS
MODIFIED STANDARDS
There are many instances when a special tool (a tool not found in the Somta catalogue or price list) can bemanfactured from a standard product. We call this a ‘modified standard’. Somta has both the capabilityand capacity to offer this service which, under normal circumstances, means a short delivery time.
The following are typical drill modifications:
Intermediate DiametersStandard sizes can be ground down to special diameters and tolerances.
Reduced Overall LengthsStandard drills can be cut to special lengths.
Drill PointsThe standard drill point angle is 118° included. This can be modified to any angle required. Many special
Drill Terminology
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points are available which include web thinning, notch points, split points, double angle points, spur andbrad points etc.
Tangs and FlatsTangs can be produced to DIN, ASA and ISO, also special whistle notch flats on shanks.
Step DrillsStandard drills can be modified into step drills.
Surface TreatmentsA full range of surface treatments including nitriding, stream oxide, chemical blackening, gold oxide andvarious titanium coatings are available.
Specify whether drill is to be Step or Subland Type.D = Diameter of large, fluted section.P = Diameter of small, fluted section.A = Shank Diameter.L = Overall Length.F = Flute Length.E = Length of Small Diameter. This is measured from the extreme point to the bottom corner of the stepangle.X°= Included angle of the step angle.S = Shank Length.
It is possible to drill two or more diameters in a hole on one operation with a correctly designeddrill and these are often used in mass production engineering.
Some of the hole types that can be drilled in a single operation.
MULTIPLE DIAMETER DRILLS
D
E S
L
F
AP
X°
Drill Terminology
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When an intermediate diameter or a non standard length of drill is required, the following diameters andlengths need to specified.
Straight Shank Drills
D = Drill DiameterA = Shank DiameterL = Overall LengthF = Flute LengthS = Shank Length
Morse Taper Shank Drills
D = Drill DiameterL = Overall LengthF = Flute LengthM = Morse Taper Size
F
S
L
AD
F
L
D
M
Drill Terminology
somta-p3somta-p4somta-p27somta-p53somta-p54somta-p55somta-p56somta-p57
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