NOGA MT UCHAMF back chamfering and countersinking tool

UCHAMF® Back Chamfering & Countersinking Tool

Q: Where are programming and cutting recommendations?

Use the UBACK Technical Center ↗ for continuous / interrupted-cut programming, insert replacement, cooling configurations, machining parameters, coatings, chip-formers and detailed cutting recommendations.

Machine hidden rear chamfers and countersinks through the existing pilot hole, without flipping the workpiece. Standard 82° / 90° inserts, special angles on request, on the coolant-actuated UBACK UX tool-holder.

Configure UCHAMF Technical Center

UCHAMF / UX Series at a Glance

The UBACK range is organized into six series. Each series covers three pilot-hole sizes and defines the standard 82° / 90° UCHAMF countersink envelope, matching UX holders and RFC capacity.

Series	Pilot-Hole Rangemm / inch	82° Countersink Rangemm / inch	90° Countersink Rangemm / inch	Standard UX Holders	RFCmm / inch
B	Ø8–10 mmØ0.315–0.394″	Ø8.5–17 mmØ0.335–0.669″	Ø8.5–18 mmØ0.335–0.709″	UX2080 / UX2090 / UX2100	43 mm1.693″
C	Ø11–13 mmØ0.433–0.512″	Ø11.5–24 mmØ0.453–0.945″	Ø11.5–25 mmØ0.453–0.984″	UX3110 / UX3120 / UX3130	52 mm2.047″
D	Ø14–16 mmØ0.551–0.630″	Ø14.5–29 mmØ0.571–1.142″	Ø14.5–31 mmØ0.571–1.220″	UX4140 / UX4150 / UX4160	72.5 mm2.854″
E	Ø17–19 mmØ0.669–0.748″	Ø17.5–34 mmØ0.689–1.339″	Ø17.5–37 mmØ0.689–1.457″	UX5170 / UX5180 / UX5190	76.5 mm3.012″
F	Ø20–22 mmØ0.787–0.866″	Ø20.5–39 mmØ0.807–1.535″	Ø20.5–42 mmØ0.807–1.654″	UX6200 / UX6210 / UX6220	76.5 mm3.012″
G	Ø23–25 mmØ0.906–0.984″	Ø23.5–44 mmØ0.925–1.732″	Ø23.5–47 mmØ0.925–1.850″	UX7230 / UX7240 / UX7250	72 mm2.835″

82° Standard RangeStandard countersink diameters extend up to Ø44 mm / 1.732″.

90° Standard RangeStandard countersink diameters extend up to Ø47 mm / 1.850″.

Special AnglesAngles other than 82° / 90° are available as application-specific inserts.

Find the Correct 82° / 90° UCHAMF Insert

Enter the angle and the pilot Ød or countersink ØD you know. Add all three values for a final check; if no standard insert fits, contact us for a special.

Standard Insert Selector Number fields use millimeters by default. Select inch if you prefer imperial input.

82° / 90° · PL · NCT

Countersink Angle α Pilot-Hole Ød Countersink ØD Units

Examples: 82° · pilot 10 → UC2103 · 90° · ØD 16.5 → UC2202. Angle + ØD returns the smallest standard insert whose ØDmax covers the diameter.

Show / hide complete Standard Insert table

Ød minmm / inch	82° SKU	82° Description	82° ØDmaxmm / inch	90° SKU	90° Description	90° ØDmaxmm / inch	Series
Ø8 mmØ0.315″	UC2101	UC-82-d080-B-PL-NCT	Ø15 mmØ0.591″	UC2201	UC-90-d080-B-PL-NCT	Ø16 mmØ0.630″	B
Ø9 mmØ0.354″	UC2102	UC-82-d090-B-PL-NCT	Ø16 mmØ0.630″	UC2202	UC-90-d090-B-PL-NCT	Ø17 mmØ0.669″	B
Ø10 mmØ0.394″	UC2103	UC-82-d100-B-PL-NCT	Ø17 mmØ0.669″	UC2203	UC-90-d100-B-PL-NCT	Ø18 mmØ0.709″	B
Ø11 mmØ0.433″	UC3101	UC-82-d110-C-PL-NCT	Ø22 mmØ0.866″	UC3201	UC-90-d110-C-PL-NCT	Ø23 mmØ0.906″	C
Ø12 mmØ0.472″	UC3102	UC-82-d120-C-PL-NCT	Ø23 mmØ0.906″	UC3202	UC-90-d120-C-PL-NCT	Ø24 mmØ0.945″	C
Ø13 mmØ0.512″	UC3103	UC-82-d130-C-PL-NCT	Ø24 mmØ0.945″	UC3203	UC-90-d130-C-PL-NCT	Ø25 mmØ0.984″	C
Ø14 mmØ0.551″	UC4101	UC-82-d140-D-PL-NCT	Ø27 mmØ1.063″	UC4201	UC-90-d140-D-PL-NCT	Ø29 mmØ1.142″	D
Ø15 mmØ0.591″	UC4102	UC-82-d150-D-PL-NCT	Ø28 mmØ1.102″	UC4202	UC-90-d150-D-PL-NCT	Ø30 mmØ1.181″	D
Ø16 mmØ0.630″	UC4103	UC-82-d160-D-PL-NCT	Ø29 mmØ1.142″	UC4203	UC-90-d160-D-PL-NCT	Ø31 mmØ1.220″	D
Ø17 mmØ0.669″	UC5101	UC-82-d170-E-PL-NCT	Ø32 mmØ1.260″	UC5201	UC-90-d170-E-PL-NCT	Ø35 mmØ1.378″	E
Ø18 mmØ0.709″	UC5102	UC-82-d180-E-PL-NCT	Ø33 mmØ1.299″	UC5202	UC-90-d180-E-PL-NCT	Ø36 mmØ1.417″	E
Ø19 mmØ0.748″	UC5103	UC-82-d190-E-PL-NCT	Ø34 mmØ1.339″	UC5203	UC-90-d190-E-PL-NCT	Ø37 mmØ1.457″	E
Ø20 mmØ0.787″	UC6101	UC-82-d200-F-PL-NCT	Ø37 mmØ1.457″	UC6201	UC-90-d200-F-PL-NCT	Ø40 mmØ1.575″	F
Ø21 mmØ0.827″	UC6102	UC-82-d210-F-PL-NCT	Ø38 mmØ1.496″	UC6202	UC-90-d210-F-PL-NCT	Ø41 mmØ1.614″	F
Ø22 mmØ0.866″	UC6103	UC-82-d220-F-PL-NCT	Ø39 mmØ1.535″	UC6203	UC-90-d220-F-PL-NCT	Ø42 mmØ1.654″	F
Ø23 mmØ0.906″	UC7101	UC-82-d230-G-PL-NCT	Ø42 mmØ1.654″	UC7201	UC-90-d230-G-PL-NCT	Ø45 mmØ1.772″	G
Ø24 mmØ0.945″	UC7102	UC-82-d240-G-PL-NCT	Ø43 mmØ1.693″	UC7202	UC-90-d240-G-PL-NCT	Ø46 mmØ1.811″	G
Ø25 mmØ0.984″	UC7103	UC-82-d250-G-PL-NCT	Ø44 mmØ1.732″	UC7203	UC-90-d250-G-PL-NCT	Ø47 mmØ1.850″	G

Standard vs. special: 82° and 90° are the standard UCHAMF angles. Other angles are produced upon order. Tool-holders and inserts are sold separately, and the insert series must match the selected UX holder series.

How to Select the Correct UX Holder and UCHAMF Insert

Keep the process simple: pilot / holder first, then angle and ØD, then reach and series compatibility.

Start with Pilot Ød

Select the UX holder whose nominal / supported pilot range fits the through hole.

Example: Ød = 8.7 mm → Series B / UX2080

Select Countersink Angle α

Choose 82° or 90° for a standard insert. Use a special-angle UC designation for application-specific requirements.

82° / 90° standard · special on request

Define ØD & Reach

Enter the required countersink diameter ØD and pilot-hole length L. Verify the selected insert's ØDmax and holder RFC.

ØD ≤ ØDmax · L ≤ RFC

Verify Series & Designation

Confirm the UC insert series matches the UX holder. For standard inserts, use the standard SKU; for special angles, use the generated UC designation.

UC-110-d080-B-PL-NCT

Chip-Formers, Coatings & Surface Treatments

The chip-former controls the cutting-edge geometry; the coating or surface treatment controls heat resistance, wear behavior, friction and material adhesion. Use this section to understand the codes used by the UCHAMF configurator and UC insert designation.

Standard inserts: 82° / 90° standard UCHAMF SKUs use PL chip-former and NCT coating. For special-angle / semi-standard inserts, use the geometry and coating options below.

PLPositive Cutting Land

PL — Positive Cutting Land

Suitable for all-round purpose and ISO P, M, K, N and S materials.

PMKNS

MLModerate Cutting Land

ML — Moderate Cutting Land

Suitable for ISO P, M, K, S and H materials.

PMKSH

HLNegative Cutting Land

HL — Negative Cutting Land

Suitable for ISO P, M, K, S and H materials.

PMKSH

Coating Types & Surface Treatments

Comparison of NOGA coating / surface-treatment codes, key characteristics, typical applications and ISO material-group suitability.

NOGA's Code	Coating	Key Features	Applications	Industries	Material Examples	ISO group
NOGA's Code	Coating	Key Features	Applications	Industries	Material Examples	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	✓	✓	✓	×	✓	✓
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	✓	✓	×	×	✓	✓
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	✓	✓	×	×	✓	✓
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	✓	✓	✓	✓	×	×
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)	✓	✓	✓	×	✓	×
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	×	×	×	✓	✓	×
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)	×	×	×	✓	×	×

P SteelM Stainless SteelK Cast IronN Non-FerrousS Heat-Resistant AlloysH Hardened Materials

The configurator recommends a chip-former and coating; confirm them for your material and setup.

UCHAMF Configurator & G-Code Generator

Select UCHAMF in Step 1, then enter the feature: it checks pilot Ød, angle, ØD and L ≤ RFC, matches the UX holder, and outputs the UC designation and CNC program.

Insert Type

Insert Configurator

Insert & Tool Match

CNC Program

Step 1: Select Insert Type

Choose the UBACK application you need. The configurator will build the exact insert designation and match the correct UX tool-holder.

⭕

USPOT US

Back counterboring / spotfacing insert.
Flat-bottom recess with defined ØD and corner radius R.
Semi-standard — built to your application.

📐

UCHAMF UC

Back countersinking / chamfering insert.
Standard 82° & 90° angles, or special angles on request.
Standard SKUs available for 82°/90°.

Click an insert type to continue — the configurator opens automatically.

Step 2: Insert Configurator

Enter your application dimensions. All designation codes are generated in metric.

⚡ Quick Fill from Insert Designation (optional)

The form fills itself as you type. Enter a full designation, or just a NOGA SKU (e.g. US2003) to pull the insert straight from the ERP database.

⚙ Configuration Parameters

📏 Unit System mm inch

Pilot-hole Diameter Ød *Range: 8.0–25.0 mm

Counterbore/Spotface ØD *

Pilot-hole Length L *

Distance the insert travels through the part — must be ≤ RFC of the tool-holder.

Corner Radius RRange: 0.1–3.0 mm

Default R = 0.4 mm (.01575″) → code R04

Countersink Angle α° *Standard: 82°, 90°

82° and 90° are stocked standards with PL-NCT; other angles are produced upon order.

ISO Material Group *

Material Hardness (HRC) — optional

Chip-Former

Auto-suggested from material

Coating (optional):

Select a material group to see the suggested coating

📐 Technical Diagram

Loading 3D engine…

⚠ 3D view unavailable — check your internet connection (Three.js). The 2D drawing still works.

Drag to rotate · scroll to zoom · right-drag to pan

ⓘ Legend

Step 3: Your Insert & Tool-Holder

Matched configuration based on your application. The insert series always matches the tool-holder series.

🔩 Insert

—

SKU:UPON ORDER

Designation Breakdown

🛠 UX Tool-Holder

—

SKU:—

Step 4: Generate CNC Program

Build the back-machining cycle for your controller using the matched tool-holder and insert.

CNC Controller

SINUMERIK

Siemens 840D · R-params · RET

FANUC

Macro B · #vars · M99

OKUMA

OSP · VC-vars · RTS

MAZAK

EIA/ISO · #vars · M99

Cutting Conditions

Cutting Conditions *

Material Group (from configurator)

📊 Recommended Cutting Data

Cutting Speed

m/min (Vc)

Feed / Rev

mm/rev (fn)

Spindle Speed

RPM

Feed Rate

mm/min

Program Options

Internal-coolant M-code

Actuates the insert

Flood M-code

Added during the cut

Coolant-off M-code

Verify per machine

Subprogram number

FANUC / Mazak O-number

Operation Parameters

Safe Z Height (mm) *

Distance above material for safe traverse

Part Bottom Hole Depth (mm)

Depth of through-hole from part bottom (usually 0)

⛔

RFC Limit Exceeded!

Counterbore/Countersink Depth (mm) *

Final depth of the back operation from the bottom face

Coolant Wait Time (sec)

Time to wait for coolant pressure (open/close insert)

Approach Feed Rate (mm/min)

Feed rate for non-cutting moves

Cutting Feed Rate (mm/min)

Auto-filled from cutting data — adjust as needed

Generated G-Code Program

⚠

For reference only. Generated CNC programs must be reviewed and validated by a qualified CNC operator before use, and run for the first time with caution (dry run, single block, reduced overrides). NOGA accepts no liability for any damage or loss arising from their use. Verify all values against your machine and setup.

NOGA MT UBACK Configurator & G-Code Generator · version —

Full UCHAMF Tool-Holder Reference

Search by UX SKU, pilot diameter, series, RFC, 82° / 90° ØDmax or spare-part code. Metric and inch values are shown together.

UCHAMF / UX Dimensional Drawing

Review FL, RFC, LTB2, pilot diameter and countersink geometry before using the holder table.

Type a pilot Ø in mm (10 → UX2100) or inches (0.394"), or a SKU, series, RFC, 82° / 90° ØD or spare-part code.

Tool-holder table · Metric / Inch

Ød minmm / inch	SKU	Description	Series	ØDS h6mm / inch	FLmm / inch	RFCmm / inch	Hmm / inch	Lmm / inch	L1mm / inch	LTB2mm / inch	82° ØDmaxmm / inch	90° ØDmaxmm / inch	Piston Plug	Insert Screw
Ø8 mmØ0.315″	UX2080	UX-d080-B-C16-H62-L115	B	Ø16 mmØ0.630″	17 mm0.669″	43 mm1.693″	62 mm2.441″	115 mm4.528″	53 mm2.087″	8.25 mm0.325″	Ø15 mmØ0.591″	Ø16 mmØ0.630″	UX0011 / M5×6	UX0005 / M2.5×0.35×7B
Ø9 mmØ0.354″	UX2090	UX-d090-B-C16-H62-L115	B	Ø16 mmØ0.630″	17.8 mm0.701″	43 mm1.693″	62 mm2.441″	115 mm4.528″	53 mm2.087″	8.25 mm0.325″	Ø16 mmØ0.630″	Ø17 mmØ0.669″	UX0011 / M5×6	UX0005 / M2.5×0.35×7B
Ø10 mmØ0.394″	UX2100	UX-d100-B-C16-H62-L115	B	Ø16 mmØ0.630″	18.8 mm0.740″	43 mm1.693″	62 mm2.441″	115 mm4.528″	53 mm2.087″	8.25 mm0.325″	Ø17 mmØ0.669″	Ø18 mmØ0.709″	UX0011 / M5×6	UX0005 / M2.5×0.35×7B
Ø11 mmØ0.433″	UX3110	UX-d110-C-C16-H80-L133	C	Ø16 mmØ0.630″	27 mm1.063″	52 mm2.047″	80 mm3.150″	133 mm5.236″	53 mm2.087″	13.6 mm0.535″	Ø22 mmØ0.866″	Ø23 mmØ0.906″	UX0011 / M5×6	UX0006 / M3×0.35×10C
Ø12 mmØ0.472″	UX3120	UX-d120-C-C16-H80-L133	C	Ø16 mmØ0.630″	27.3 mm1.075″	52 mm2.047″	80 mm3.150″	133 mm5.236″	53 mm2.087″	13.6 mm0.535″	Ø23 mmØ0.906″	Ø24 mmØ0.945″	UX0011 / M5×6	UX0006 / M3×0.35×10C
Ø13 mmØ0.512″	UX3130	UX-d130-C-C16-H80-L133	C	Ø16 mmØ0.630″	28 mm1.102″	52 mm2.047″	80 mm3.150″	133 mm5.236″	53 mm2.087″	13.6 mm0.535″	Ø24 mmØ0.945″	Ø25 mmØ0.984″	UX0011 / M5×6	UX0006 / M3×0.35×10C
Ø14 mmØ0.551″	UX4140	UX-d140-D-C20-H105-L158	D	Ø20 mmØ0.787″	32.5 mm1.280″	72.5 mm2.854″	105 mm4.134″	158 mm6.220″	53 mm2.087″	15.3 mm0.602″	Ø27 mmØ1.063″	Ø29 mmØ1.142″	UX0012 / M6×6	UX0007 / M3×0.35×13D
Ø15 mmØ0.591″	UX4150	UX-d150-D-C20-H105-L158	D	Ø20 mmØ0.787″	32.5 mm1.280″	72.5 mm2.854″	105 mm4.134″	158 mm6.220″	53 mm2.087″	15.3 mm0.602″	Ø28 mmØ1.102″	Ø30 mmØ1.181″	UX0012 / M6×6	UX0007 / M3×0.35×13D
Ø16 mmØ0.630″	UX4160	UX-d160-D-C20-H105-L158	D	Ø20 mmØ0.787″	32.5 mm1.280″	72.5 mm2.854″	105 mm4.134″	158 mm6.220″	53 mm2.087″	15.3 mm0.602″	Ø29 mmØ1.142″	Ø31 mmØ1.220″	UX0012 / M6×6	UX0007 / M3×0.35×13D
Ø17 mmØ0.669″	UX5170	UX-d170-E-C20-H115-L170	E	Ø20 mmØ0.787″	38.5 mm1.516″	76.5 mm3.012″	115 mm4.528″	170 mm6.693″	55 mm2.165″	18 mm0.709″	Ø32 mmØ1.260″	Ø35 mmØ1.378″	UX0012 / M6×6	UX0008 / M3×0.35×16E
Ø18 mmØ0.709″	UX5180	UX-d180-E-C20-H115-L170	E	Ø20 mmØ0.787″	38.5 mm1.516″	76.5 mm3.012″	115 mm4.528″	170 mm6.693″	55 mm2.165″	18 mm0.709″	Ø33 mmØ1.299″	Ø36 mmØ1.417″	UX0012 / M6×6	UX0008 / M3×0.35×16E
Ø19 mmØ0.748″	UX5190	UX-d190-E-C20-H115-L170	E	Ø20 mmØ0.787″	38.5 mm1.516″	76.5 mm3.012″	115 mm4.528″	170 mm6.693″	55 mm2.165″	18 mm0.709″	Ø34 mmØ1.339″	Ø37 mmØ1.457″	UX0012 / M6×6	UX0008 / M3×0.35×16E
Ø20 mmØ0.787″	UX6200	UX-d200-F-C25-H120-L175	F	Ø25 mmØ0.984″	43.5 mm1.713″	76.5 mm3.012″	120 mm4.724″	175 mm6.890″	55 mm2.165″	20 mm0.787″	Ø37 mmØ1.457″	Ø40 mmØ1.575″	UX0013 / M8×6	UX0009 / M4×0.5×19F
Ø21 mmØ0.827″	UX6210	UX-d210-F-C25-H120-L175	F	Ø25 mmØ0.984″	43.5 mm1.713″	76.5 mm3.012″	120 mm4.724″	175 mm6.890″	55 mm2.165″	20 mm0.787″	Ø38 mmØ1.496″	Ø41 mmØ1.614″	UX0013 / M8×6	UX0009 / M4×0.5×19F
Ø22 mmØ0.866″	UX6220	UX-d220-F-C25-H120-L175	F	Ø25 mmØ0.984″	43.5 mm1.713″	76.5 mm3.012″	120 mm4.724″	175 mm6.890″	55 mm2.165″	20 mm0.787″	Ø39 mmØ1.535″	Ø42 mmØ1.654″	UX0013 / M8×6	UX0009 / M4×0.5×19F
Ø23 mmØ0.906″	UX7230	UX-d230-G-C25-H120-L175	G	Ø25 mmØ0.984″	48 mm1.890″	72 mm2.835″	120 mm4.724″	175 mm6.890″	55 mm2.165″	22 mm0.866″	Ø42 mmØ1.654″	Ø45 mmØ1.772″	UX0013 / M8×6	UX0010 / M4×0.5×21G
Ø24 mmØ0.945″	UX7240	UX-d240-G-C25-H120-L175	G	Ø25 mmØ0.984″	48 mm1.890″	72 mm2.835″	120 mm4.724″	175 mm6.890″	55 mm2.165″	22 mm0.866″	Ø43 mmØ1.693″	Ø46 mmØ1.811″	UX0013 / M8×6	UX0010 / M4×0.5×21G
Ø25 mmØ0.984″	UX7250	UX-d250-G-C25-H120-L175	G	Ø25 mmØ0.984″	48 mm1.890″	72 mm2.835″	120 mm4.724″	175 mm6.890″	55 mm2.165″	22 mm0.866″	Ø44 mmØ1.732″	Ø47 mmØ1.850″	UX0013 / M8×6	UX0010 / M4×0.5×21G

No UX tool-holder matches this search. Try a SKU, series letter, pilot diameter, RFC value, 82° / 90° ØDmax or spare-part code.

LTB2UCHAMF uses the holder LTB2 parameter for rear-side positioning.

Tool + InsertUX tool-holders and UCHAMF inserts are sold separately.

Series MatchThe UCHAMF insert series must match the UX holder series.

UCHAMF at a glance

Screening values. The configurator confirms the exact holder and insert.

Pilot-Hole Range: Ø8–25 mm / 0.315–0.984″
Standard Angles: 82° and 90° · special angles on request
82° Countersink Range: Ø8.5–44 mm / 0.335–1.732″
90° Countersink Range: Ø8.5–47 mm / 0.335–1.850″
Minimum Pressure: 6 bar / 90 PSI
Tool-Holder Family: UBACK UX / DURASHIELD

Primary compatibility checks: pilot-hole length L ≤ RFC, requested countersink diameter ØD ≤ ØDmax for the selected angle / insert, and the UCHAMF insert series must match the UX holder series.

Selection and technical links

Start with the Application — Not the Catalog Table

Start with pilot diameter, countersink angle and required ØD, then use the configurator, standard-insert table, holder data and coding references for verification.

Configure UCHAMF

Enter pilot diameter, ØD, pilot-hole length, angle and material. Match the UX holder and generate the UC insert designation.

Open configurator Check Standard Inserts

See the B–G series and all standard 82° / 90° UCHAMF SKUs with their maximum countersink diameters.

View range Selection Logic

Follow four checks for pilot diameter, angle, countersink diameter, holder reach and series compatibility.

How to select Technical Center

Programming, interrupted-cut guidance, insert replacement, cooling configurations, cutting data, chip-formers and coatings.

Open Technical Center

Application examples

Typical rear edges UCHAMF chamfers and countersinks through the pilot hole.

Hidden Rear-Edge Chamfer

Chamfer the rear edge of a through hole from the front side of the workpiece without repositioning the component.

Back Countersinking

Create controlled rear countersinks through the existing pilot hole using the foldable UBACK mechanism.

UCHAMF 82 and 90 degree standard countersink geometry

Standard 82° / 90° Angles

Use standard UCHAMF insert SKUs for the two most common countersink angles and verify ØDmax by pilot-hole size.

UCHAMF UBACK rear-side machining application

Deep / Restricted Rear Access

Use RFC and LTB2 to verify that the holder reaches safely below the workpiece before the rear chamfering move.

UCHAMF special-angle insert ordering example

Special-Angle Chamfers

For angles beyond the standard 82° and 90° range, configure an application-specific UCHAMF insert with the required angle, chip-former and coating.

How the UBACK mechanism works

Coolant, emulsion or air through the spindle (6 bar / 90 PSI minimum) opens the insert below the part and lets it fold back for a safe exit.

UBACK hydraulic mechanism - insert open, cut and retract video preview

Plays muted when in view

Enter with the Insert Folded

Move through the pilot hole with the insert retracted to protect the bore and cutting edge.

Move Below the Workpiece

Use FL, RFC and LTB2 to reach a safe position below the rear surface before engagement.

Actuate & Machine

Pressure deploys the insert. Approach the rear edge and machine the required 82°, 90° or special-angle chamfer / countersink.

Close & Retract

Move to the safe retract position, return the insert to transit state and exit through the pilot hole.

Programming: the cycle uses FL / LTB positioning and pressure on/off commands. The configurator generates controller-specific G-code; verify it on the machine before production.

Understand the Holder and UCHAMF Insert Codes

The configurator creates the designation automatically. These diagrams are useful references for purchasing, engineering drawings and quotations.

Designation diagrams and ordering example

UX Tool-Holder Coding

Holder designation communicates pilot diameter, series, shank size, working height and overall length.

UCHAMF Insert Coding

UC designation identifies countersink angle, pilot / holder size, series, chip-former and coating.

Aluminum 7075 · 110° Countersink

Pilot HoleØ8.7 mm / 0.343″

Countersink Angle110°

ApplicationSpecial-angle rear countersink

MaterialAluminum 7075

Recommended tool-holderUX2080 · UX-d080-B-C16-H62-L115

UCHAMF insert designationUC-110-d080-B-PL-NCT

Watch UCHAMF & UBACK in Action

UCHAMF machining hidden rear chamfers and countersinks through the pilot hole.

UCHAMF back chamfering and countersinking video preview

Plays muted when in view

UCHAMF Back Chamfering with the UBACK System

See the foldable UBACK mechanism applied to rear chamfering / countersinking without flipping the workpiece.

DURASHIELD Tool-Holders

DURASHIELD identifies NOGA MT's premium holder platform. The UX holder family uses a passivated construction designed for corrosion resistance, structural integrity and demanding industrial service.

High strengthToughnessWear resistanceMachinabilityHeat resistanceCorrosion resistance

UCHAMF Selection Questions

Can UCHAMF machine a rear chamfer without turning or flipping the workpiece?

Yes. UCHAMF passes through the existing pilot hole with the insert folded, deploys below the part and machines the hidden rear chamfer / countersink from the same setup.

Which UCHAMF angles are standard?

82° and 90° are standard UCHAMF countersink angles. The standard SKUs shown on this page use PL chip-former and NCT coating.

Can UCHAMF be supplied with a special countersink angle?

Yes. Angles other than 82° and 90° can be produced as application-specific / semi-standard UCHAMF inserts. Use the configurator to create the UC designation and send the application drawing for confirmation.

What is the maximum countersink diameter?

It depends on pilot-hole size and countersink angle. The standard range reaches up to Ø44 mm / 1.732″ for 82° inserts and Ø47 mm / 1.850″ for 90° inserts. Verify the exact ØDmax in the standard-insert or holder table.

How do I select the correct UCHAMF insert?

Start with pilot-hole diameter and select the matching UX holder / series. Then select 82°, 90° or a special angle, verify the requested ØD is within the insert limit and confirm pilot-hole length L ≤ RFC.

How is the insert opened and closed?

The UBACK UX holder uses coolant / emulsion or air pressure to actuate the insert. Minimum pressure is 6 bar / 90 PSI.

What is the difference between LTB2 and RFC?

RFC is the available relief / reach for the cutting operation and is used for the L ≤ RFC compatibility check. LTB2 is the UCHAMF holder positioning reference used for the rear-side cycle.

Do the UCHAMF insert and UX tool-holder need the same series?

Yes. Series B–G identifies the compatible UBACK geometry family. The UCHAMF insert series must match the UX holder series.

Are the tool-holder and insert sold together?

No. UX tool-holders and UCHAMF inserts are sold separately.

Where are programming and cutting recommendations?

Use the UBACK Technical Center ↗ for continuous / interrupted-cut programming, insert replacement, cooling configurations, machining parameters, coatings, chip-formers and detailed cutting recommendations.

Have the Drawing? Configure UCHAMF First.

Start with pilot diameter, angle and ØD in the configurator. For special angles, unusual geometries or interrupted rear edges, send the workpiece drawing, material and machine details to NOGA MT.

Configure UCHAMF Send drawing / application