Technical Resources

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Turning (Square Shank) NomenclatureBoring Bar NomenclatureModular Head Boring NomenclatureChatter-Free Boring NomenclatureUltra-Adjust Boring NomenclatureInsert NomenclatureInsert Grade ConditionsInsert Speeds & FeedsChatter-Free Setup TipsChatter-Free Proper HoldingChatter-Free Hangout SpecsChatter-Free CrossoversChatter-Free Tuning Guide

Series Boring Bar Nomenclature


Threading/Grooving


Threading/Grooving


Boring Bar

ULTRA-ADJUST Unit



GoodBetterBestSteelStainless SteelCast IronFerrite MaterialsHeat-Resistant SteelHardened Metal
GradeDescriptionPMKNSH
UD51General purpose Tin (CVD) coated steel grade – used for roughing and semi-finishing of carbon alloy and stainless steel.
UD52Tough general purpose steel grade with multi-layer titanium aluminum nitride coating for alloy steel, aluminum alloys, austenitic stainless and carbon steels, copper alloys and exotic alloys.
HP230 *Productive steel turning grade under stable conditions.
HP250 *Universal steel turning grade-The best in efficiency and productivity.
UD21Multi-layer titanium aluminum nitride grade. Excellent for machining cast iron.
HM240 *Stainless steel turning grade. Finishing to light roughing.
HM250 *Turning grade for wide application in the stainless steel range. Finishing to roughing.
HS220 *Excellent for heat resistance and titanium alloys
UD2Uncoated – Used to cut cast iron, aluminum, non-ferrous alloys, non-metals and most high temp alloys. Provides excellent wear resistance.
HN432 *Ideal grade for aluminum. Low tendency for adhesion.
UD22Tin coated insert. Suitable for semi-finishing and finishing of high temp alloys. Intended for cast iron machining.
UD32TiAIN coated insert. Used in high speed medium load applications of stainless steel and finishing to semi-finishing of high temperature alloys.
HK036 *Stability in a wide range of applications with long tool life. First choice for turning cast iron.
UD5CUncoated cermet grade for semi-finishing and finishing applications at medium to high cutting speeds on carbon and alloyed steels. Also used on stainless. Normally used without coolant.
UD5CTTiALN coated cermet grade performs extremely well for semi-finish and finish applications in alloyed steels, stainless and high carbon steels.
UD1Uncoated – Designed with a polished surface and large rake angle, Intended for machining aluminum and other non-ferrous alloys. Also works well for semi machining on cast iron.
HP470 *Suitable for demanding steel milling applications, interrupted cut.
HM470 *Stainless steel milling grade. PVD, TiAlN coating.
HS470 *First choice for milling heat-resistant alloys.
HS480 *Extremely heat-resistant tough grade for milling titanium.
HK430 *Milling grade for cast iron.
HP600 *Super tough substrate with PVD coating. Excellent for drilling steel and stainless steel.
HK356 *Stable cutting performance for drilling cast iron. Suitable for aluminum. Recommended for mild structural steel, difficult chip controlled steel.
UD2CBNA Polycrystalline Cubic Boron Nitride (PCBN) Insert for cat iron, gray cast iron, chilled cast, and powder metal with long tool life. Coolant not recommended for use.
UD5CBNA Polycrystalline Cubic Boron Nitride (PCBN) Insert for precision finishing of hardened steels 50-65 rockwell. Coolant not recommended for use.
UD2PCDPolycrystalline Diamond with Carbide Reinforced Diamond, Sharpness and Low Cutting Pressure allowing tight tolerances. Finishing of all non-ferrous metals and non-metallics.
UD25Uncoated – Used to cut aluminum, brass, copper, nickel base alloys, titanium and non-ferrous materials.
UD204A PVD TiAlN coated fine grain substrate. Excellent for light to medium feeds on cast iron and semi-finishing to finishing of high temperature alloys. Excellent for high SFM.
UD404A PVD TiAlN coated tough general purpose grade. Well suited for milling alloy steels, stainless steel, high temperature alloy steels and hardened steels up to 60 Rc.
UD602A CVD coating of Ti A12O3 & TiN on a tough substrate. It is suitable for light to heavy milling of alloy steel and non-alloy steel, even under unfavorable condition.

*HIGH PERFORMANCE GRADES AVAILABLE

ISO Inserts

APKT Inserts

MILLING

DRILLING

PATRIOT High Performance Inserts

PATRIOT MILLING

PATRIOT DRILLING


  • Choosing the largest possible bar size with the shortest overhang will
    provide rigidity to minimize vibrations.
  • Make sure to allow clearance for chips.
  • 5:1 Chatter-Free bars are recommended for grooving and threading where
    forces are higher than in turning.
  • Proper clamping of the bar is crucial to performance.
    (set screws should not come in contact with the bar)
  • Overhang is measured from cutting edge to face of boring bar holder.
    Bars should not be extended past the specified diameter to length ratio.
    The Bars can be modified to reduce overall length.
  • To compensate for bar deflection due to extended overhangs,
    rotating the insert above center line will help.



5:1 Ratio

BAR DIAMETER (D) MIN. OVERHAND (L1) MAX. OVERHANG (L2) OVERALL LENGTH ©WEIGHT (LBS)
1.5005.7507.509.004.5
2.0006.37510.0012.0010.7
2.5006.75012.5016.0022.8

7:1 Ratio

1.0005.0007.0010.002.2
1.2505.0008.7512.004.1
1.5005.75010.5015.007.5
1.7506.00012.2518.0011.3
2.0006.37514.0020.0018.0
2.5006.75017.5027.0042.0
3.00012.50021.0031.0063.0

10:1 Ratio

1.0006.00010.0014.003.1
1.2506.75012.5016.005.7
1.5009.00015.0019.0011.0
1.75010.62517.5023.0017.0
2.00012.37520.0026.0025.0
2.50015.87525.0033.0042.0
3.00019.37530.0040.0088.0
4.00026.37540.0050.00182.0

12:1 Ratio

1.0009.25012.0016.005.9
1.25012.16015.0018.009.0
1.50014.75018.0022.0016.4
1.75016.43521.0025.0025.4
2.00017.75024.0029.0037.7

14:1 Ratio

1.0009.25014.0018.006.9
1.25012.16017.5021.0010.9
1.50014.75021.0025.0018.6
1.75016.43524.5029.0031.0
2.00017.75028.0033.0044.2


ULTRA-DEX recommends a min. clamping length of 3xD
5:1 Chatter-Free bars have a min. clamping length of 2xD

Crossovers

Standard Connection

Ultra-DexKennametal ®
MH16 SCLCR3-CFTH16 SCLCR3
MH16 SCLCL3-CFTH16 SCLCL3
MH16 MCLNR4-CFTH16 MCLNR4
MH20 MCLNR4-CFTH20 MCLNR4
MH24 MCLNR4-CFTH24 MCLNR4
MH28 MCLNR4-CFTH28 MCLNR4
MH32 MCLNR4-CFTH32 MCLNR4
MH40 MCLNR4-CFTH40 MCLNR4
MH24 MCLNR5-CFTH24 MCLNR5
MH32 MCLNR5-CFTH32 MCLNR5
MH40 MCLNR5-CFTH40 MCLNR5
MH32 MCLNR6-CFTH32 MCLNR6
MH40 MCLNR6-CFTH40 MCLNR6
MH16 MCLNL4-CFTH16 MCLNL4
MH20 MCLNL4-CFTH20 MCLNL4
MH24 MCLNL4-CFTH24 MCLNL4
MH28 MCLNL4-CFTH28 MCLNL4
MH32 MCLNL4-CFTH32 MCLNL4
MH40 MCLNL4-CFTH40 MCLNL4
MH24 MCLNL5-CFTH24 MCLNL5
MH32 MCLNL5-CFTH32 MCLNL5
MH40 MCLNL5-CFTH40 MCLNL5
MH32 MCLNL6-CFTH32 MCLNL6
MH40 MCLNL6-CFTH40 MCLNL6
MH24 MSKNR4-CFTH24 MSKNR4
MH28 MSKNR4-CFTH28 MSKNR4
MH32 MSKNR4-CFTH32 MSKNR4
MH40 MSKNR6-CFTH40 MSKNR6
MH20 MWLNR4-CFTH20 MWLNR4
MH24 MWLNR4-CFTH24 MWLNR4
MH28 MWLNR4-CFTH28 MWLNR4
MH32 MWLNR4-CFTH32 MWLNR4
MH20 MWLNL4-CFTH20 MWLNL4
MH24 MWLNL4-CFTH24 MWLNL4
MH28 MWLNL4-CFTH28 MWLNL4
MH32 MWLNL4-CFTH32 MWLNL4
MH16 MDUNR3-CFTH16 MDUNR3
MH24 MDUNR3-CFTH24 MDUNR3
MH32 MDUNR3-CFTH32 MDUNR3
MH20 MDUNR4-CFTH20 MDUNR4
MH24 MDUNR4-CFTH24 MDUNR4
MH28 MDUNR4-CFTH28 MDUNR4
MH32 MDUNR4-CFTH32 MDUNR4
MH40 MDUNR4-CFTH40 MDUNR4
MH16 MDUNL3-CFTH16 MDUNL3
MH24 MDUNL3-CFTH24 MDUNL3
MH32 MDUNL3-CFTH32 MDUNL3
MH20 MDUNL4-CFTH20 MDUNL4
MH24 MDUNL4-CFTH24 MDUNL4
MH28 MDUNL4-CFTH28 MDUNL4
MH32 MDUNL4-CFTH32 MDUNL4
MH40 MDUNL4-CFTH40 MDUNL4
Ultra-DexKennametal ®
MH20 MVUNR3-CFTH20 MVUNR3
MH24 MVUNR3-CFTH24 MVUNR3
MH32 MVUNR3-CFTH32 MVUNR3
MH40 MVUNR3-CFTH40 MVUNR3
MH20 MVUNL3-CFTH20 MVUNL3
MH24 MVUNL3-CFTH24 MVUNL3
MH32 MVUNL3-CFTH32 MVUNL3
MH40 MVUNL3-CFTH40 MVUNL3
MH40 MVUNR4-CFTH40 MVUNR4
MH40 MVUNL4-CFTH40 MVUNL4
MH16 LSER3-CFTH16 LSER3
MH20 LSER3-CFTH20 LSER3
MH24 LSER3-CFTH24 LSER3
MH28 LSER3-CFTH28 LSER3
MH32 LSER3-CFTH32 LSER3
MH24 LSER4-CFTH24 LSER4
MH32 LSER4-CFTH32 LSER4
MH32 LSER5-CFTH32 LSER5
MH40 LSER5-CFTH40 LSER5
MH16 LSEL3-CFTH16 LSEL3
MH20 LSEL3-CFTH20 LSEL3
MH24 LSEL3-CFTH24 LSEL3
MH24 LSEL4-CFTH24 LSEL4
MH32 LSEL4-CFTH32 LSEL4
MH32 LSEL5-CFTH32 LSEL5
MH40 LSEL5-CFTH40 LSEL5
MH20 NER3-CFTH20 NER3W
MH24 NER3-CFTH24 NER3W
MH28 NER3-CFTH28 NER3W
MH32 NER3-CFTH32 NER3W
MH28 NER4-CFTH28 NER4W
MH32 NER4-CFTH32 NER4W
MH40 NER4-CFTH40 NER4W
MH28 NER6-CFTH28 NER6W
MH32 NER6-CFTH32 NER6W
MH40 NER6-CFTH40 NER6W
MH20 NEL3-CFTH20 NEL3W
MH24 NEL3-CFTH24 NEL3W
MH28 NEL3-CFTH28 NEL3W
MH32 NEL3-CFTH32 NEL3W
MH28 NEL4-CFTH28 NEL4W
MH32 NEL4-CFTH32 NEL4W
MH40 NEL4-CFTH40 NEL4W
MH28 NEL6-CFTH28 NEL6W
MH32 NEL6-CFTH32 NEL6W
MH40 NEL6-CFTH40 NEL6W

Serrated Connection

Ultra-DexSandvik ®
SH16 SCLCR3570-SCLCR-25-09
SH20 SCLCR3570-SCLCR-32-10
SH24 SCLCR4570-SCLCR-40-12
SH16 SCLCL3570-SCLCL-25-09
SH20 SCLCL3570-SCLCL-32-10
SH24 SCLCL4570-SCLCL-40-12
SH20 STFCR3570-STFCR-32-16
SH24 STFCR3570-STFCR-40-16
SH20 STFCL3570-STFCL-32-16
SH24 STFCL3570-STFCL-40-16
SH16 SDUCR3570-SDUCR-25-11
SH20 SDUCR3570-SDUCR-32-11
SH24 SDUCR3570-SDUCR-40-11
SH16 SDUCL3570-SDUCL-25-11
SH20 SDUCL3570-SDUCL-32-11
SH24 SDUCL3570-SDUCL-40-11
SH16 SDNCR2570-SDXCR-25-07-D
SH20 SDNCR3570-SDXCR-32-11
SH24 SDNCR3570-SDXCR-40-11
SH16 SDNCL2570-SDXCL-25-07-D
SH20 SDNCL3570-SDXCL-32-11
SH24 SDNCL3570-SDXCL-40-11
Ultra-DexSandvik ®
SH16 SDXCR2570-SDCCR-25-07-DX
SH20 SDXCR3570-SDCCR-32-11X
SH24 SDXCR3570-SDCCR-40-11X
SH16 SDXCL2570-SDCCL-25-07-DX
SH20 SDXCL3570-SDCCL-32-11X
SH24 SDXCL3570-SDCCL-40-11X
SH20 DCLNR4570-DCLNR-32-12-L
SH24 DCLNR4570-DCLNR-40-12-L
SH20 DCLNL4570-DCLNL-32-12-L
SH24 DCLNL4570-DCLNL-40-12-L
SH20 DDUNR3570-DDUNR-32-11
SH20 DDUNL3570-DDUNL-32-11
SH20 DTFNR3570-DTFNR-32-16-L
SH24 DTFNR3570-DTFNR-40-16-L
SH20 DTFNL3570-DTFNL-32-16-L
SH24 DTFNL3570-DTFNL-40-16-L
SH20 DWLNR4570-DWLNR-32-08-LE
SH24 DWLNR4570-DWLNR-40-08-L
SH20 DWLNL4570-DWLNL-32-08-LE
SH24 DWLNL4570-DWLNL-40-08-L


For Bars ø.75” and Smaller:

  1. Make a test cut with the bar.
  2. Insert supplied T-handle wrench into the end of the bar.
  3. If the pitch of the chatter was high, tighten the adjust screw 1/16 turn. (+)
    If the pitch of the chatter was low, loosen the adjust screw 1/16 turn. (-)
  4. Make a test cut with the bar.
  5. Repeat step 3 until the desired performance is achieved.

For Bars ø1.0″ and Above:

  1. Make a test cut with the bar.
  2. Loosen lock screw two complete turns in the negative direction.
  3. If the pitch of the chatter was high, tighten the adjust screw 1/2 digit. (+)
    If the pitch of the chatter was low, loosen the adjust screw 1/2 digit. (-)
  4. Make a test cut with the bar.
  5. Repeat step 3 until the desired performance is achieved.
  6. Tighten lock screw. DO NOT over tighten lock screw.


All Chatter-Free boring bars come pre-tuned from the factory, but due to
variances in the rigidity of each machine the bars may need to be tuned.