Ultimate Chamfer® – Back-Chamfering Tool for CNC Machines

Ultimate Back: Precision Back Counter Solutions

The Ultimate Back line brings together the innovative UX tool-holders and USPOT/UCHAMF inserts to redefine machining precision. Featuring a patented hydraulic mechanism that ingeniously uses the machine’s coolant liquid, this system delivers exceptional control over insert movement. The result? Unparalleled accuracy, repeatability, and streamlined operations for back counterboring, back countersinking, and back spot-facing tasks.

With its advanced engineering, Ultimate Back eliminates the need for workpiece rotation, effortlessly performing operations in a single pass while significantly boosting productivity and efficiency.

Highlights of Ultimate Back

  • UX Tool-Holders with Hydraulic Precision: The UX tool-holders feature a hydraulic mechanism powered by coolant pressure, ensuring smooth, accurate, and repeatable insert movement.
  • USPOT and UCHAMF Inserts: Designed to handle specific machining needs, these inserts deliver outstanding results in back spot-facing, back counterboring, and back countersinking operations.
  • Single-Pass Efficiency: Eliminate workpiece rotation and achieve precise machining in one seamless pass.
  • Industry-Grade Reliability: Engineered to meet the rigorous demands of aerospace, automotive, medical, and electronics industries.
  • Time and Cost Savings: Reduced cycle times and optimized operations ensure significant productivity gains.

Benefits of Ultimate Back

  • Efficient Single Operation: Perform chamfering and counterboring through holes in one pass without rotating the workpiece.
  • Customizable Solutions: UX tool-holders support tailored configurations with USPOT and UCHAMF inserts, offering options for coatings, chip-formers, corner radii, and more.
  • Easy insert replacement with one type screw and no need for special jig.
  • Innovative Hydraulic Control: UX tool-holders provide precise and consistent operation while simplifying insert replacement.
  • Superior Chip Management: Prevent interruptions with excellent chip control for smooth and efficient machining.
  • Cost-Effective for All Scales: From small-scale projects to high-volume production, this system delivers exceptional value.
  • Automation-Ready Design: Seamlessly integrates into automated manufacturing systems for maximum efficiency.
  • Coolant-Driven Mechanism: Operates smoothly with internal coolant, air or emulsion control (minimum 6 bar / 90 PSI), ensuring consistent results.
  • Pilot-Hole Protection: The protective insert design safeguards the integrity of the pilot hole during pass-through operations.
  • Versatile Applications: UX tool-holders are compatible with a wide range of USPOT and UCHAMF inserts, making them suitable for diverse machining tasks.
  • Wide Range of Sizes: The UX tool-holders are available in diameters from Ø8 mm to Ø25 mm (.315-.984”) with various chamfer angles and spotface diameters.

Why Ultimate Back Stands Out

The Ultimate Back system combines the precision of UX tool-holders with the versatility of USPOT and UCHAMF inserts to deliver unparalleled performance. Its innovative design optimizes machining processes, reduces cycle times, and achieves flawless results in high-demand industries.

Whether you’re working in aerospace, automotive, medical, or electronics sectors, Ultimate Back is the ultimate choice for back spot-facing, back counterboring, and back countersinking operations.

UCHAMF_WorkPiece_1
UChamf 2-1
What is DURASHIELD?

When you see this logo on our tools, you can trust that you’re holding a product built for excellence. DURASHIELD represents NOGA MT’s premium line of tool-holders, engineered to excel in the most demanding environments. Delivering exceptional performance, extended tool life, and unmatched reliability, DURASHIELD tool-holders feature advanced corrosion resistance and superior structural integrity. They set a new benchmark for strength, durability, and precision, redefining industry standards.

MT DURASHIELD Offering:

Strength: Ensures tools can withstand heavy loads

Toughness: Maintains reliability under demanding conditions

Wear Resistance: Extends tool lifespan and reduces costs

Machinability: Facilitates the design of precise tool-holders

Heat Resistance: Maintains performance at high temperatures

Corrosion Resistance: Ideal for harsh environments

The NOGA MT DURASHIELD family of tool-holders undergoes a passivation process to enhance corrosion resistance. This process eliminates the need for additional coatings and chemicals, simplifies production, reduces environmental impact, and provides a more eco-friendly corrosion protection solution.

UBACK Series and Range with UCHAMF Inserts for Back Countersink or Chamfering applications:

The UBACK line is organized into series or groups, with each series optimized for a specific pilot-hole range:

Series

Ød Pilot-Hole Range

mm

/inch

ØD Countersink Range

for 82°

mm

/inch

ØD Countersink Range

for 90°

mm

/inch

B

8.0–10.0

/0.315–0.394″

8.5–17.0

/0.335–0.670″

8.5–18.0

/0.335–0.709″

C

11.0–13.0

/0.433–0.512″

11.5–24.0

/0.453–0.945″

11.5–25.0

/0.453–0.984 “

D

14.0–16.0

/0.551–0.630″

14.5–29.0

/0.571–1.142″

14.5–31.0

/0.571–1.220″

E

17.0–19.0

/0.669–0.748″

17.5–34.0

/0.689–1.339″

17.5–37.0

/0.689–1.457″

F

20.0–22.0

/0.787–0.866″

20.5–39.0

/0.807–1.535″

20.5–42.0

/0.807–1.653″

G

23.0–25.0

/0.906–0.984″

23.5–44.0

/0.925–1.732″

23.5–47.0

/0.925–1.850″

The UCHAMF inserts are offered as standard (82°, 90° countersink angles) or semi-standard solutions tailored to meet customer-specific applications.

It is mandatory to match the tool-holder series with the corresponding insert series.

UBACK Standard Tool-Holders with UCHAMF Inserts(mm)

LTB2 – Length To Bottom / RFC – Relief For Cutting / FL – Folding Length

Ødmin.

Pilot Hole

Tool-Holder

SKU

Tool-Holder

Description

ØDS h6

FL

RFC

H

L

L1

LTB2(1)
UCHAMF

Weight

(gram)

Piston
Plug (2)

Insert Clamping Screw M*P*L (mm)

Series (3)

8

UX2080

UX-d080-B-C16-H62-L115

16

17

43

62

115

53

8.25

69

UX0011/
M5x6

UX0005/

M2.5×0.35x7B

B

9

UX2090

UX-d090-B-C16-H62-L115

16

17.8

43

62

115

53

8.25

76

B

10

UX2100

UX-d100-B-C16-H62-L115

16

18.8

43

62

115

53

8.25

82

B

11

UX3110

UX-d110-C-C16-H80-L133

16

27

52

80

133

53

13.6

93

UX0011/
M5x6

UX0006/

M3x0.35x10C

C

12

UX3120

UX-d120-C-C16-H80-L133

16

27.3

52

80

133

53

13.6

103

C

13

UX3130

UX-d130-C-C16-H80-L133

16

28

52

80

133

53

13.6

115

C

14

UX4140

UX-d140-D-C20-H105-L158

20

32.5

72.5

105

158

53

15.3

160

UX0012/
M6x6

UX0007/

M3x0.35x13D

D

15

UX4150

UX-d150-D-C20-H105-L158

20

32.5

72.5

105

158

53

15.3

178

D

16

UX4160

UX-d160-D-C20-H105-L158

20

32.5

72.5

105

158

53

15.3

196

D

17

UX5170

UX-d170-E-C20-H115-L170

20

38.5

76.5

115

170

55

18

231

UX0012/
M6x6

UX0008/

M3x0.35x16E

E

18

UX5180

UX-d180-E-C20-H115-L170

20

38.5

76.5

115

170

55

18

254

E

19

UX5190

UX-d190-E-C20-H115-L170

20

38.5

76.5

115

170

55

18

278

E

20

UX6200

UX-d200-F-C25-H120-L175

25

43.5

76.5

120

175

55

20

344

UX0013/
M8x6

UX0009/

M4x0.5x19F

F

21

UX6210

UX-d210-F-C25-H120-L175

25

43.5

76.5

120

175

55

20

373

F

22

UX6220

UX-d220-F-C25-H120-L175

25

43.5

76.5

120

175

55

20

403

F

23

UX7230

UX-d230-G-C25-H120-L175

25

48

72

120

175

55

22

427

UX0013/
M8x6

UX0010/

M4x0.5x21G

G

24

UX7240

UX-d240-G-C25-H120-L175

25

48

72

120

175

55

22

445

G

25

UX7250

UX-d250-G-C25-H120-L175

25

48

72

120

175

55

22

492

G

(1) The LTB parameter varies between USPOT and UCHAMF inserts

(2) Piston plug designed to adapt to different coolant systems. For more info, click here.

(3) The insert series must match the series of the tool holder.

Note: Tool-holders and inserts are sold separately.

  • UX Tool-holders spare parts:
  • SP0105 Hex L-Key 0.050" 1+1/16/1+9/16
  • UX0003 Pin for Insert Replacement
  • Insert Clamping Screw – according to the table above
  • UX0011 M5 x 6 mm plug set screw
Technical Guidelines

UBACK Standard Tool-Holders with UCHAMF Inserts(Imperial)

LTB2 – Length To Bottom / RFC – Relief For Cutting / FL – Folding Length

Ødmin.

Pilot
Hole

Tool-Holder

SKU

Tool-Holder

Description

ØDS h6

FL

RFC

H

L

L1

LTB2(1)
UCHAMF

Weight

(lbs)

Piston
Plug (2)

Insert
Clamping Screw M*P*L (mm)

Series (3)

0.315

UX2080

UX-d080-B-C16-H62-L115

0.630

0.669

1.693

2.441

4.528

2.087

0.325

0.1521

UX0011/
M5x6

UX0005/

M2.5×0.35x7B

B

0.354

UX2090

UX-d090-B-C16-H62-L115

0.630

0.701

1.693

2.441

4.528

2.087

0.325

0.1676

B

0.394

UX2100

UX-d100-B-C16-H62-L115

0.630

0.740

1.693

2.441

4.528

2.087

0.325

0.1808

B

0.433

UX3110

UX-d110-C-C16-H80-L133

0.630

1.063

2.047

3.150

5.236

2.087

0.535

0.205

UX0011/
M5x6

UX0006/

M3x0.35x10C

C

0.472

UX3120

UX-d120-C-C16-H80-L133

0.630

1.075

2.047

3.150

5.236

2.087

0.535

0.2271

C

0.512

UX3130

UX-d130-C-C16-H80-L133

0.630

1.102

2.047

3.150

5.236

2.087

0.535

0.2535

C

0.551

UX4140

UX-d140-D-C20-H105-L158

0.787

1.280

2.854

4.134

6.220

2.087

0.602

0.3527

UX0012/
M6x6

UX0007/

M3x0.35x13D

D

0.591

UX4150

UX-d150-D-C20-H105-L158

0.787

1.280

2.854

4.134

6.220

2.087

0.602

0.3924

D

0.630

UX4160

UX-d160-D-C20-H105-L158

0.787

1.280

2.854

4.134

6.220

2.087

0.602

0.4321

D

0.669

UX5170

UX-d170-E-C20-H115-L170

0.787

1.516

3.012

4.528

6.693

2.165

0.709

0.5093

UX0012/
M6x6

UX0008/

M3x0.35x16E

E

0.709

UX5180

UX-d180-E-C20-H115-L170

0.787

1.516

3.012

4.528

6.693

2.165

0.709

0.56

E

0.748

UX5190

UX-d190-E-C20-H115-L170

0.787

1.516

3.012

4.528

6.693

2.165

0.709

0.6129

E

0.787

UX6200

UX-d200-F-C25-H120-L175

0.984

1.713

3.012

4.724

6.890

2.165

0.787

0.7584

UX0013/
M8x6

UX0009/

M4x0.5x19F

F

0.827

UX6210

UX-d210-F-C25-H120-L175

0.984

1.713

3.012

4.724

6.890

2.165

0.787

0.8223

F

0.866

UX6220

UX-d220-F-C25-H120-L175

0.984

1.713

3.012

4.724

6.890

2.165

0.787

0.8885

F

0.906

UX7230

UX-d230-G-C25-H120-L175

0.984

1.890

2.835

4.724

6.890

2.165

0.866

0.9414

UX0013/
M8x6

UX0010/

M4x0.5x21G

G

0.945

UX7240

UX-d240-G-C25-H120-L175

0.984

1.890

2.835

4.724

6.890

2.165

0.866

0.9811

G

0.984

UX7250

UX-d250-G-C25-H120-L175

0.984

1.890

2.835

4.724

6.890

2.165

0.866

1.0847

G

(1) The LTB parameter varies between USPOT and UCHAMF inserts

(2) Piston plug designed to adapt to different coolant systems. For more info, click here.

(3) The insert series must match the series of the tool holder.

Note: Tool-holders and inserts are sold separately.

  • UX Tool-holders spare parts:
  • SP0105 Hex L-Key 0.050" 1+1/16/1+9/16
  • UX0003 Pin for Insert Replacement
  • Insert Clamping Screw – according to the table above
  • UX0011 M5 x 6 mm plug set screw
Technical Guidelines

UBACK tool-holders coding system specifications and identification:

Ordering special UBack Tool-holders

We can also modify or produce tailor-made tool-holders.

If you need further assistance, please don’t hesitate to contact us.

Providing an application drawing or sketch, the raw material details, and any other relevant information will help us assist you more effectively.

How to Select the Correct Tool-Holder and UCHAMF Insert to Match Your Application:

For Standard Inserts:
  • Refer to the “UCHAMF 82° and 90° Standard Inserts (mm/inch)” table below.
  • Standard inserts are available for 82° and 90° countersink angles.
For Semi-Standard Solutions:
  1. Select the appropriate tool-holder based on the pilot hole diameter.
    For example, if the pilot hole diameter is 8.5 mm, choose the UX2080, which supports a minimum diameter (Ødmin) of 8 mm.
  2. Define the required parameters for the UCHAMF insert, including the countersink angle, chip-former, and coating.
  3. Complete the relevant details for the UCHAMF insert description according to the specifications provided below.
  4. Ensure compatibility between the UCHAMF insert series and the corresponding UX tool-holder. The series of the insert must align with the series of the tool-holder.
  •  

Notes:

  1. Coating-Our top recommendation is the NCT grade, featuring the versatile TiAlN PVD coating. It offers excellent thermal stability, oxidation resistance, and is compatible with a wide range of materials, including mild steels, stainless steel, and Inconel. For additional options, refer to the list of available coatings below.
  2. Tool-holders and inserts are sold separately.

UCHAMF inserts coding system specifications and identification:

UCHAMF 82° and 90° Standard Inserts (mm/inch):

Ødmin.

Pilot Hole

Countersunk angle α=82°

Countersunk angle α=90°

Series

Insert SKU

Insert Description

ØDmax.
mm/inch

Insert SKU

Insert Description

ØDmax.

mm/inch

8

UC2101

UC-82-d080-B-PL-NCT

15/0.591

UC2201

UC-90-d080-B-PL-NCT

16/0.630

B

9

UC2102

UC-82-d090-B-PL-NCT

16/0.630

UC2202

UC-90-d090-B-PL-NCT

17/0.669

10

UC2103

UC-82-d100-B-PL-NCT

17/0.669

UC2203

UC-90-d100-B-PL-NCT

18/0.709

11

UC3101

UC-82-d110-C-PL-NCT

22/0.866

UC3201

UC-90-d110-C-PL-NCT

23/0.906

C

12

UC3102

UC-82-d120-C-PL-NCT

23/0.906

UC3202

UC-90-d120-C-PL-NCT

24/0.945

13

UC3103

UC-82-d130-C-PL-NCT

24/0.945

UC3203

UC-90-d130-C-PL-NCT

25/0.984

14

UC4101

UC-82-d140-D-PL-NCT

27/1.063

UC4201

UC-90-d140-D-PL-NCT

29/1.142

D

15

UC4102

UC-82-d150-D-PL-NCT

28/1.102

UC4202

UC-90-d150-D-PL-NCT

30/1.181

16

UC4103

UC-82-d160-D-PL-NCT

29/1.142

UC4203

UC-90-d160-D-PL-NCT

31/1.220

17

UC5101

UC-82-d170-E-PL-NCT

32/1.260

UC5201

UC-90-d170-E-PL-NCT

35/1.378

E

18

UC5102

UC-82-d180-E-PL-NCT

33/1.299

UC5202

UC-90-d180-E-PL-NCT

36/1.417

19

UC5103

UC-82-d190-E-PL-NCT

34/1.339

UC5203

UC-90-d190-E-PL-NCT

37/1.457

20

UC6101

UC-82-d200-F-PL-NCT

37/1.457

UC6201

UC-90-d200-F-PL-NCT

40/1.575

F

21

UC6102

UC-82-d210-F-PL-NCT

38/1.496

UC6202

UC-90-d210-F-PL-NCT

41/1.614

22

UC6103

UC-82-d220-F-PL-NCT

39/1.535

UC6203

UC-90-d220-F-PL-NCT

42/1.654

23

UC7101

UC-82-d230-G-PL-NCT

42/1.654

UC7201

UC-90-d230-G-PL-NCT

45/1.772

G

24

UC7102

UC-82-d240-G-PL-NCT

43/1.693

UC7202

UC-90-d240-G-PL-NCT

46/1.811

25

UC7103

UC-82-d250-G-PL-NCT

44/1.732

UC7203

UC-90-d250-G-PL-NCT

47/1.850

UCHAMF - Ordering Special Inserts:

Here is an example of coding a special UCHAMF insert for the application shown on the right:
  1. Ød= 8.7mm (0.343″)
  2. Countersink angle= 110°
  3. Material: Aluminim AISI / EN AW / JIS – 7075
 The recommended tool-holder is: UX2080 / UX-d080-B-C16-H62-L115 with Ødmin=8mm (0.315″)
The corresponding insert is: UC-110-d080-B-PL-NCT
Important Notes:
  1. Ensure that the pilot-hole length (L) is less than or equal to the RFC (Relief For Cutting): L ⩽ RFC, as specified in the UBACK tool-holders table below.
  2. Ensure that the countersink diameter ØD is less than or equal to the maximum allowable diameter: ØD ⩽ ØDmax, as specified in the UBACK tool-holders table below.
If you need further assistance, please don’t hesitate to contact us.
Providing an application drawing or sketch, the raw material specifications, and any other relevant information will help us assist you more effectively.

👨‍🔧 UCHAMF Configurator
Insert & Tool-Holder Code Generator

Available Coating types and surface treatments:

NOGA’s Code

Coating

Key Features

Applications

Industries

Material Examples

ISO GROUP

P

M

K

N

S

H

NCT

TiAlN

Excellent thermal
stability, oxidation resistance, and wear resistance.

High-speed cutting and
general-purpose machining. Works in wet & dry conditions.

Aerospace, Automotive,

General Engineering

AISI 304, 42CrMo4,
Grey Cast Iron (GG), Ti6Al4V

✓

✓

✓

X

✓

✓

NCD

TiAlSiN

Very high hardness,
extreme oxidation resistance (>1200°C). Excels in dry machining at high
speeds.

Suitable for hardened
steels >45 Rc.

High-performance
machining in demanding environments.

Aerospace, Automotive,

Die & Mold

Inconel 718, AISI
4140, Ti6Al4V, Hastelloy

✓

✓

X

X

✓

✓

NCA

AlTiSiN

High hardness, thermal
stability, and wear resistance.

Works well in dry,
high-speed cutting.

Suitable for hardened
steels >45 Rc.

High-speed machining
in extreme conditions.

Aerospace, Automotive,

Precision Engineering

AISI 316, AISI H13,
Hastelloy

✓

✓

X

X

✓

✓

NCN

AlCrN

High oxidation
resistance (to 1100°C), toughness, abrasion resistance.

General machining in
abrasive/wet conditions.

Automotive, Aerospace,

Die & Mold

AISI 304, AISI 1045,
Grey Cast Iron (GG), AL6061, Die Steels

✓

✓

✓

✓

X

X

NCW

AlTiN

High hardness, wear
resistance, thermal stability up to 1100°C.

Heavy-duty machining
and high-speed cutting.

Dry & abrasive
conditions.

Aerospace, Automotive,

Heavy Engineering

AISI 4340, M2 HSS,
Grey Cast Iron (GG)

✓

✓

✓

X

✓

X

NCB

TiB₂

Excellent thermal
stability, hardness, and very high conductivity.

Prevents material
adhesion and BUE.

High-speed machining
of non-ferrous metals.

Aerospace, Automotive,
Electronics

AL7075, 6061-T6,
Copper, Magnesium Alloys (AZ31), SiC composites

X

X

X

✓

✓

X

POL

Polishing (Surface
Treatment)

Removes scratches,
burrs, and

micro-defects.

Produces smooth finish

and reduces friction.

High-speed finishing
of non-ferrous materials. Improves MRR and surface aesthetics.

Aerospace, Automotive

AL7075, 6061-T6,
Copper, Magnesium Alloys (AZ31)

X

X

X

✓

X

X

Chip-Formers:

PL

Positive cutting land

Suitable for all around purpose
and ISO P,M,K,N,S
as well as composite materials

ML

Moderate cutting land

Suitable for and ISO P,M,K,S,H
Materials

HL

Negative cutting land

Suitable for and ISO P,M,K,S,H
Materials
Accessibility by WAH