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



GoodBetterBest Steel Stainless Steel Cast Iron Ferrite Materials Heat-Resistant Steel Hardened Metal
Grade Description P M K N S H
UD51 General purpose Tin (CVD) coated steel grade – used for roughing and semi-finishing of carbon alloy and stainless steel.
UD52 Tough 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.
UD21 Multi-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
UD2 Uncoated – 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.
UD22 Tin coated insert. Suitable for semi-finishing and finishing of high temp alloys. Intended for cast iron machining.
UD32 TiAIN 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.
UD5C Uncoated 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.
UD5CT TiALN coated cermet grade performs extremely well for semi-finish and finish applications in alloyed steels, stainless and high carbon steels.
UD1 Uncoated – 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.
UD2CBN A 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.
UD5CBN A Polycrystalline Cubic Boron Nitride (PCBN) Insert for precision finishing of hardened steels 50-65 rockwell. Coolant not recommended for use.
UD2PCD Polycrystalline Diamond with Carbide Reinforced Diamond, Sharpness and Low Cutting Pressure allowing tight tolerances. Finishing of all non-ferrous metals and non-metallics.
UD25 Uncoated – Used to cut aluminum, brass, copper, nickel base alloys, titanium and non-ferrous materials.
UD204 A 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.
UD404 A 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.
UD602 A 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)
1.500 5.750 7.50 9.00 4.5
2.000 6.375 10.00 12.00 10.7
2.500 6.750 12.50 16.00 22.8

7:1 Ratio

1.000 5.000 7.00 10.00 2.2
1.250 5.000 8.75 12.00 4.1
1.500 5.750 10.50 15.00 7.5
1.750 6.000 12.25 18.00 11.3
2.000 6.375 14.00 20.00 18.0
2.500 6.750 17.50 27.00 42.0
3.000 12.500 21.00 31.00 63.0

10:1 Ratio

1.000 6.000 10.00 14.00 3.1
1.250 6.750 12.50 16.00 5.7
1.500 9.000 15.00 19.00 11.0
1.750 10.625 17.50 23.00 17.0
2.000 12.375 20.00 26.00 25.0
2.500 15.875 25.00 33.00 42.0
3.000 19.375 30.00 40.00 88.0
4.000 26.375 40.00 50.00 182.0

12:1 Ratio

1.000 9.250 12.00 16.00 5.9
1.250 12.160 15.00 18.00 9.0
1.500 14.750 18.00 22.00 16.4
1.750 16.435 21.00 25.00 25.4
2.000 17.750 24.00 29.00 37.7

14:1 Ratio

1.000 9.250 14.00 18.00 6.9
1.250 12.160 17.50 21.00 10.9
1.500 14.750 21.00 25.00 18.6
1.750 16.435 24.50 29.00 31.0
2.000 17.750 28.00 33.00 44.2


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-Dex Kennametal ®
MH16 SCLCR3-CFT H16 SCLCR3
MH16 SCLCL3-CFT H16 SCLCL3
MH16 MCLNR4-CFT H16 MCLNR4
MH20 MCLNR4-CFT H20 MCLNR4
MH24 MCLNR4-CFT H24 MCLNR4
MH28 MCLNR4-CFT H28 MCLNR4
MH32 MCLNR4-CFT H32 MCLNR4
MH40 MCLNR4-CFT H40 MCLNR4
MH24 MCLNR5-CFT H24 MCLNR5
MH32 MCLNR5-CFT H32 MCLNR5
MH40 MCLNR5-CFT H40 MCLNR5
MH32 MCLNR6-CFT H32 MCLNR6
MH40 MCLNR6-CFT H40 MCLNR6
MH16 MCLNL4-CFT H16 MCLNL4
MH20 MCLNL4-CFT H20 MCLNL4
MH24 MCLNL4-CFT H24 MCLNL4
MH28 MCLNL4-CFT H28 MCLNL4
MH32 MCLNL4-CFT H32 MCLNL4
MH40 MCLNL4-CFT H40 MCLNL4
MH24 MCLNL5-CFT H24 MCLNL5
MH32 MCLNL5-CFT H32 MCLNL5
MH40 MCLNL5-CFT H40 MCLNL5
MH32 MCLNL6-CFT H32 MCLNL6
MH40 MCLNL6-CFT H40 MCLNL6
MH24 MSKNR4-CFT H24 MSKNR4
MH28 MSKNR4-CFT H28 MSKNR4
MH32 MSKNR4-CFT H32 MSKNR4
MH40 MSKNR6-CFT H40 MSKNR6
MH20 MWLNR4-CFT H20 MWLNR4
MH24 MWLNR4-CFT H24 MWLNR4
MH28 MWLNR4-CFT H28 MWLNR4
MH32 MWLNR4-CFT H32 MWLNR4
MH20 MWLNL4-CFT H20 MWLNL4
MH24 MWLNL4-CFT H24 MWLNL4
MH28 MWLNL4-CFT H28 MWLNL4
MH32 MWLNL4-CFT H32 MWLNL4
MH16 MDUNR3-CFT H16 MDUNR3
MH24 MDUNR3-CFT H24 MDUNR3
MH32 MDUNR3-CFT H32 MDUNR3
MH20 MDUNR4-CFT H20 MDUNR4
MH24 MDUNR4-CFT H24 MDUNR4
MH28 MDUNR4-CFT H28 MDUNR4
MH32 MDUNR4-CFT H32 MDUNR4
MH40 MDUNR4-CFT H40 MDUNR4
MH16 MDUNL3-CFT H16 MDUNL3
MH24 MDUNL3-CFT H24 MDUNL3
MH32 MDUNL3-CFT H32 MDUNL3
MH20 MDUNL4-CFT H20 MDUNL4
MH24 MDUNL4-CFT H24 MDUNL4
MH28 MDUNL4-CFT H28 MDUNL4
MH32 MDUNL4-CFT H32 MDUNL4
MH40 MDUNL4-CFT H40 MDUNL4
Ultra-Dex Kennametal ®
MH20 MVUNR3-CFT H20 MVUNR3
MH24 MVUNR3-CFT H24 MVUNR3
MH32 MVUNR3-CFT H32 MVUNR3
MH40 MVUNR3-CFT H40 MVUNR3
MH20 MVUNL3-CFT H20 MVUNL3
MH24 MVUNL3-CFT H24 MVUNL3
MH32 MVUNL3-CFT H32 MVUNL3
MH40 MVUNL3-CFT H40 MVUNL3
MH40 MVUNR4-CFT H40 MVUNR4
MH40 MVUNL4-CFT H40 MVUNL4
MH16 LSER3-CFT H16 LSER3
MH20 LSER3-CFT H20 LSER3
MH24 LSER3-CFT H24 LSER3
MH28 LSER3-CFT H28 LSER3
MH32 LSER3-CFT H32 LSER3
MH24 LSER4-CFT H24 LSER4
MH32 LSER4-CFT H32 LSER4
MH32 LSER5-CFT H32 LSER5
MH40 LSER5-CFT H40 LSER5
MH16 LSEL3-CFT H16 LSEL3
MH20 LSEL3-CFT H20 LSEL3
MH24 LSEL3-CFT H24 LSEL3
MH24 LSEL4-CFT H24 LSEL4
MH32 LSEL4-CFT H32 LSEL4
MH32 LSEL5-CFT H32 LSEL5
MH40 LSEL5-CFT H40 LSEL5
MH20 NER3-CFT H20 NER3W
MH24 NER3-CFT H24 NER3W
MH28 NER3-CFT H28 NER3W
MH32 NER3-CFT H32 NER3W
MH28 NER4-CFT H28 NER4W
MH32 NER4-CFT H32 NER4W
MH40 NER4-CFT H40 NER4W
MH28 NER6-CFT H28 NER6W
MH32 NER6-CFT H32 NER6W
MH40 NER6-CFT H40 NER6W
MH20 NEL3-CFT H20 NEL3W
MH24 NEL3-CFT H24 NEL3W
MH28 NEL3-CFT H28 NEL3W
MH32 NEL3-CFT H32 NEL3W
MH28 NEL4-CFT H28 NEL4W
MH32 NEL4-CFT H32 NEL4W
MH40 NEL4-CFT H40 NEL4W
MH28 NEL6-CFT H28 NEL6W
MH32 NEL6-CFT H32 NEL6W
MH40 NEL6-CFT H40 NEL6W

Serrated Connection

Ultra-Dex Sandvik ®
SH16 SCLCR3 570-SCLCR-25-09
SH20 SCLCR3 570-SCLCR-32-10
SH24 SCLCR4 570-SCLCR-40-12
SH16 SCLCL3 570-SCLCL-25-09
SH20 SCLCL3 570-SCLCL-32-10
SH24 SCLCL4 570-SCLCL-40-12
SH20 STFCR3 570-STFCR-32-16
SH24 STFCR3 570-STFCR-40-16
SH20 STFCL3 570-STFCL-32-16
SH24 STFCL3 570-STFCL-40-16
SH16 SDUCR3 570-SDUCR-25-11
SH20 SDUCR3 570-SDUCR-32-11
SH24 SDUCR3 570-SDUCR-40-11
SH16 SDUCL3 570-SDUCL-25-11
SH20 SDUCL3 570-SDUCL-32-11
SH24 SDUCL3 570-SDUCL-40-11
SH16 SDNCR2 570-SDXCR-25-07-D
SH20 SDNCR3 570-SDXCR-32-11
SH24 SDNCR3 570-SDXCR-40-11
SH16 SDNCL2 570-SDXCL-25-07-D
SH20 SDNCL3 570-SDXCL-32-11
SH24 SDNCL3 570-SDXCL-40-11
Ultra-Dex Sandvik ®
SH16 SDXCR2 570-SDCCR-25-07-DX
SH20 SDXCR3 570-SDCCR-32-11X
SH24 SDXCR3 570-SDCCR-40-11X
SH16 SDXCL2 570-SDCCL-25-07-DX
SH20 SDXCL3 570-SDCCL-32-11X
SH24 SDXCL3 570-SDCCL-40-11X
SH20 DCLNR4 570-DCLNR-32-12-L
SH24 DCLNR4 570-DCLNR-40-12-L
SH20 DCLNL4 570-DCLNL-32-12-L
SH24 DCLNL4 570-DCLNL-40-12-L
SH20 DDUNR3 570-DDUNR-32-11
SH20 DDUNL3 570-DDUNL-32-11
SH20 DTFNR3 570-DTFNR-32-16-L
SH24 DTFNR3 570-DTFNR-40-16-L
SH20 DTFNL3 570-DTFNL-32-16-L
SH24 DTFNL3 570-DTFNL-40-16-L
SH20 DWLNR4 570-DWLNR-32-08-LE
SH24 DWLNR4 570-DWLNR-40-08-L
SH20 DWLNL4 570-DWLNL-32-08-LE
SH24 DWLNL4 570-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.