UFIBER® TECHNICAL INFORMATION

Cross-Hole Brush UFIBER® – Technical Information & Application Guide

UFIBER® Cross-Hole Brushes are ceramic-fiber tools for controlled deburring and finishing of internal bores and cross-hole intersections. During rotation, the fibers expand under centrifugal force to contact the internal surface and intersecting edges.

Suitable for machining centers, CNC equipment and robotic systems across steel, stainless steel, aluminum, heat-resistant alloys, cast iron, composites and resin materials.

Features

↗

Centrifugal Expansion

Fibers spread outward during rotation to contact the internal bore and cross-hole edges.

◎

Internal Burr Removal

Designed for fine burr removal at internal cylinder surfaces and intersecting holes.

✦

Residue & Scale Removal

Helps remove cutting particles, processing residue and black scale.

◆

Ceramic Cutting Edges

Ceramic fibers provide cutting action through exposed abrasive edges.

◫

Wide Material Coverage

For steel, stainless steel, aluminum, cast iron, composites and resin materials.

⚙

CNC & Robotic Ready

Suitable for machining centers, CNC equipment and robotic systems.

Cross-Hole Brush Product Range

SKU#	Description	Grit size	Ødmm / inch	Lmm / inch	Ød2mm / inch	L2mm / inch	ØDSmm / inch	Weightgram	Maximum spindle speedmin⁻¹	Suitable pilot-hole diameter
SKU#	Description	Grit size	Ødmm / inch	Lmm / inch	Ød2mm / inch	L2mm / inch	ØDSmm / inch	Weightgram	Maximum spindle speedmin⁻¹	Grit #150–#1000mm / inch	Grit #1200–#6000mm / inch
UF2115	UF-CH-G-D015-L50	#150	Ø1.50.059"	501.97"	Ø2.50.098"	1204.72"	Ø30.118"	3	20000	3.5-50.138"-.197"	3.5-50.138"-0.197"
UF2215	UF-CH-P-D015-L50	#200
UF2315	UF-CH-V-D015-L50	#400
UF2415	UF-CH-O-D015-L50	#600
UF2515	UF-CH-B-D015-L50	#800
UF2615	UF-CH-W-D015-L50	#1000
UF2715	UF-CH-R-D015-L50	#1200
UF2815	UF-CH-M-D015-L50	#2000
UF2915	UF-CH-Z-D015-L50	#3000
UF2015	UF-CH-A-D015-L50	#6000
UF2130	UF-CH-G-D030-L60	#150	Ø30.118"	602.36"	Ø40.158"	1305.12"	Ø30.118"	6	14000	5-70.197"-0.276"	-
UF2230	UF-CH-P-D030-L60	#200
UF2330	UF-CH-V-D030-L60	#400
UF2430	UF-CH-O-D030-L60	#600
UF2530	UF-CH-B-D030-L60	#800
UF2630	UF-CH-W-D030-L60	#1000
UF2730	UF-CH-R-D030-L50	#1200		501.97"		1204.72"			14000	-	5-70.197"-0.276"
UF2830	UF-CH-M-D030-L50	#2000
UF2930	UF-CH-Z-D030-L50	#3000
UF2030	UF-CH-A-D030-L50	#6000
UF2150	UF-CH-G-D050-L60	#150	Ø50.197"	602.36"	Ø60.236"	1305.12"	Ø60.236"	17	14000	7-90.276"-.354"	-
UF2250	UF-CH-P-D050-L60	#200
UF2350	UF-CH-V-D050-L60	#400
UF2450	UF-CH-O-D050-L60	#600
UF2550	UF-CH-B-D050-L60	#800
UF2650	UF-CH-W-D050-L60	#1000
UF2750	UF-CH-R-D050-L50	#1200		501.97"		1204.72"			14000	-	8-100.315"-0.394"
UF2850	UF-CH-M-D050-L50	#2000
UF2950	UF-CH-Z-D050-L50	#3000
UF2050	UF-CH-A-D050-L50	#6000
UF2170	UF-CH-G-D070-L60	#150	Ø70.276"	602.36"	Ø80.315"	1305.12"	Ø60.236"	24	14000	9-140.354"-.551"	-
UF2270	UF-CH-P-D070-L60	#200
UF2370	UF-CH-V-D070-L60	#400
UF2470	UF-CH-O-D070-L60	#600
UF2570	UF-CH-B-D070-L60	#800
UF2670	UF-CH-W-D070-L60	#1000
UF2770	UF-CH-R-D070-L50	#1200		501.97"		1204.72"			14000	-	10-200.394"-0.787"
UF2870	UF-CH-M-D070-L50	#2000
UF2970	UF-CH-Z-D070-L50	#3000
UF2070	UF-CH-A-D070-L50	#6000
NEWUF2411	UF-CH-O-D110-L60	#600	Ø110.433”	602.362”	Ø120.472”	1807.480"	Ø120.472"	115	14000	14-200.551”-0.787”	-
NEWUF2511	UF-CH-B-D110-L60	#800
NEWUF2611	UF-CH-W-D110-L60	#1000

Grit Selection by Burr Condition & Material

Grit	UFIBER Code	Fiber Color	Relative Action	Typical Application
#150	G	Green	Very aggressive	Heavy burrs, hardened materials
#200	P	Pink	Aggressive	Hardened steel and difficult burrs
#400	V	Violet	Medium-coarse	Steel, stainless and heat-resistant alloys
#600	O	Orange	General deburring	General-purpose metal deburring
#800	B	Blue	Fine deburring	Fine burr removal and pre-finish
#1000	W	White	Fine finishing	Tool marks and controlled surface finishing
#1200	R	Red	Fine polishing	Non-ferrous metals and final finishing
#2000	M	Dark Green	Very fine	Aluminum, plastics and delicate surfaces
#3000	Z	Dark Pink	Ultra-fine	Composite and high-finish applications
#6000	A	Light Violet	Micro-finish	Final polishing of composites and plastics

UFIBER color identification: Each grit is identified by its fiber color according to the UFIBER grit coding system.

How to Use the UFIBER® Cross-Hole Brush

Important: Stroke must always extend completely past the cross-hole intersection. Adjust the number of passes — not the stroke distance.

Insert While Stationary

Insert the brush into the bore without rotation.

Start Rotation Inside the Bore

Begin rotation only after the brush is correctly positioned.

Process Through the Cross-Hole

Rotate through the cross-hole area to contact the intersecting edges.

Pull Back While Processing

Retract through the intersection to avoid pressing burrs flat.

Push Forward While Processing

Advance through the intersection to remove remaining upward-facing burrs.

Stop Rotation

Stop completely before changing direction.

Reverse Direction & Repeat

Use both CW and CCW and repeat pull-back / push-forward passes as required.

Remove While Stationary

Stop completely before withdrawing the brush.

How to Work with the UFIBER® Cross-Hole Brush — Video Demonstrations

UFIBER Cross-Hole Brush

Understanding the Relationship Between RPM and Brush Diameter:

Rotational Speed (RPM): As the speed of the brush rotation increases, the brush fibers spread outward due to centrifugal force. This results in an increase in the brush’s outer diameter.

Grit Levels: Brushes come in different grit levels, which determine their coarseness. Coarser grits (e.g., #400) tend to have less variation in diameter with increasing RPM, whereas finer grits (e.g., #1000 and above) show a more pronounced increase in diameter.

How to Use the UFIBER® Cross-Hole Brush

Insert the brush without rotation: Keep the brush stationary during insertion to avoid bristle damage or scattering.
Rotate through the cross-hole: Use both clockwise and counterclockwise rotation for consistent edge quality.
Pull the brush back while processing: This prevents burrs from being pressed against the inner surface.
Push the brush forward while processing: This helps remove any remaining upward-facing burrs.
Stop the brush rotation.
Change rotation direction.
Repeat steps 3–6 as needed.
Remove the brush while stationary: Make sure the brush has completely stopped before removal.

Cross-Hole operating sequence: Insert stationary, start rotation only inside the bore, process in both directions as required, stop before reversing, and remove only after rotation has completely stopped.

Cross-Hole Brush Diameter Control

↗

RPM Increases Working Diameter

As RPM increases, centrifugal force spreads the ceramic fibers outward.

#400

Coarser Grits

Coarser grits generally require higher RPM for equivalent expansion.

#1200+

Finer Grits

Finer grits can show more diameter change as RPM changes.

RPM selection: Use pilot-hole diameter + selected brush size + grit. Conventional DOC is not applicable.

Using the Cross-Hole Brush with Different Hole Geometries

⊥

T-Shaped Hole

d_cross < d_main

The cross-hole diameter must be smaller than the main-bore diameter.

＋

Cross-Shaped Hole

d_cross ≤ 0.7 × d_main

The cross-hole diameter should be 70% or less of the main bore.

UFIBER® Cross-Hole Brush — Machining Recommendations

UFIBER® Cross-Hole Brush

Machining Recommendations

Complete material-by-material starting parameters for cross-hole deburring and polishing. Use the ISO filters or search box to find a material or grade, then use the grit guide below together with the RPM calculator.

Search material / grade

41 of 41 material conditions • RPM is selected by pilot-hole diameter + grit • Metric + imperial feed values • No DOC — use stroke through the cross-hole

WORKPIECE MATERIAL					DEBURRING				POLISHING				COOLANT Recommended Method
ISO	Material Group	Material Details	Condition	AISI / SAE / ASTM DIN W.-Nr.	RPM Pilot hole + grit	Feed mm/min \| in/min	Stroke / Passes	UFIBER Deburring Grit	RPM Pilot hole + grit	Feed mm/min \| in/min	Stroke / Passes	UFIBER Polishing Grit	COOLANT Recommended Method
P	Non-alloy steel and cast steel, free cutting steel	<0.25% C	Annealed	1020 1.0044	Use RPM CALCULATOR pilot hole + grit	300–380 / 11.8–15.0	2–3 passes Stroke 5 mm past	#400 / #600 #800 fine burrs	Use RPM CALCULATOR pilot hole + grit	350–450 / 13.8–17.7	3–4 passes Stroke 5 mm past	#800 → #1200	Air / Wet
P	Non-alloy steel and cast steel, free cutting steel	≥0.25% C	Annealed	1035 1.0501	Use RPM CALCULATOR pilot hole + grit	300–380 / 11.8–15.0	2–3 passes Stroke 5 mm past	#400 / #600 #800 fine burrs	Use RPM CALCULATOR pilot hole + grit	350–450 / 13.8–17.7	3–4 passes Stroke 5 mm past	#800 → #1200	Air / Wet
P	Non-alloy steel and cast steel, free cutting steel	<0.55% C	Quenched and tempered	1045 1.1201	Use RPM CALCULATOR pilot hole + grit	250–320 / 9.8–12.6	2–4 passes Stroke 5 mm past	#150 / #200 / #400	Use RPM CALCULATOR pilot hole + grit	300–380 / 11.8–15.0	3–5 passes Stroke 5 mm past	#400 → #800 #1000 / #1200 final	Wet preferred
P	Non-alloy steel and cast steel, free cutting steel	≥0.55% C	Annealed	1055 1.0535	Use RPM CALCULATOR pilot hole + grit	300–380 / 11.8–15.0	2–3 passes Stroke 5 mm past	#150 / #200 / #400	Use RPM CALCULATOR pilot hole + grit	350–450 / 13.8–17.7	3–4 passes Stroke 5 mm past	#400 → #800 #1000 / #1200 final	Air / Wet
P	Non-alloy steel and cast steel, free cutting steel	≥0.55% C	Quenched and tempered	1060 1.1221	Use RPM CALCULATOR pilot hole + grit	250–320 / 9.8–12.6	2–4 passes Stroke 5 mm past	#150 / #200 / #400	Use RPM CALCULATOR pilot hole + grit	300–380 / 11.8–15.0	3–5 passes Stroke 5 mm past	#400 → #800 #1000 / #1200 final	Wet preferred
P	Low alloy and cast steel (<5% alloying elements)	—	Annealed	G92600 1.5028	Use RPM CALCULATOR pilot hole + grit	300–380 / 11.8–15.0	2–3 passes Stroke 5 mm past	#400 / #600 #800 fine burrs	Use RPM CALCULATOR pilot hole + grit	350–450 / 13.8–17.7	3–4 passes Stroke 5 mm past	#800 → #1200	Air / Wet
P	Low alloy and cast steel (<5% alloying elements)	—	Quenched and tempered	4130 1.7218	Use RPM CALCULATOR pilot hole + grit	250–320 / 9.8–12.6	2–4 passes Stroke 5 mm past	#150 / #200 / #400	Use RPM CALCULATOR pilot hole + grit	300–380 / 11.8–15.0	3–5 passes Stroke 5 mm past	#400 → #800 #1000 / #1200 final	Wet preferred
P	Low alloy and cast steel (<5% alloying elements)	—	Quenched and tempered	4142 1.2332	Use RPM CALCULATOR pilot hole + grit	300–380 / 11.8–15.0	2–3 passes Stroke 5 mm past	#150 / #200 / #400	Use RPM CALCULATOR pilot hole + grit	350–450 / 13.8–17.7	3–4 passes Stroke 5 mm past	#400 → #800 #1000 / #1200 final	Air / Wet
P	Low alloy and cast steel (<5% alloying elements)	—	Quenched and tempered	5045 1.7006	Use RPM CALCULATOR pilot hole + grit	300–380 / 11.8–15.0	2–3 passes Stroke 5 mm past	#150 / #200 / #400	Use RPM CALCULATOR pilot hole + grit	350–450 / 13.8–17.7	3–4 passes Stroke 5 mm past	#400 → #800 #1000 / #1200 final	Air / Wet
P	High alloyed steel, cast steel and tool steel	—	Annealed	H13 1.2344	Use RPM CALCULATOR pilot hole + grit	250–320 / 9.8–12.6	2–4 passes Stroke 5 mm past	#150 / #200 / #400	Use RPM CALCULATOR pilot hole + grit	300–380 / 11.8–15.0	3–5 passes Stroke 5 mm past	#400 → #800 #1000 / #1200 final	Wet preferred
P	High alloyed steel, cast steel and tool steel	—	Quenched and tempered	M33 1.3249	Use RPM CALCULATOR pilot hole + grit	250–320 / 9.8–12.6	2–4 passes Stroke 5 mm past	#150 / #200 / #400	Use RPM CALCULATOR pilot hole + grit	300–380 / 11.8–15.0	3–5 passes Stroke 5 mm past	#400 → #800 #1000 / #1200 final	Wet preferred
P	Stainless steel and cast steel	Ferritic / martensitic	—	420 1.4021	Use RPM CALCULATOR pilot hole + grit	250–320 / 9.8–12.6	2–4 passes Stroke 5 mm past	#150 / #200 / #400	Use RPM CALCULATOR pilot hole + grit	300–380 / 11.8–15.0	3–5 passes Stroke 5 mm past	#400 → #800 #1000 / #1200 final	Wet preferred
P	Stainless steel and cast steel	Martensitic	—	— —	Use RPM CALCULATOR pilot hole + grit	250–320 / 9.8–12.6	2–4 passes Stroke 5 mm past	#150 / #200 / #400	Use RPM CALCULATOR pilot hole + grit	300–380 / 11.8–15.0	3–5 passes Stroke 5 mm past	#400 → #800 #1000 / #1200 final	Wet preferred
M	Stainless steel	Austenitic, duplex	—	304L 1.4306	Use RPM CALCULATOR pilot hole + grit	250–350 / 9.8–13.8	2–3 passes Stroke 5 mm past	#400 / #600 #800 fine burrs	Use RPM CALCULATOR pilot hole + grit	300–400 / 11.8–15.7	3–4 passes Stroke 5 mm past	#800 → #1200	Wet recommended
K	Gray cast iron (GG)	Ferritic / pearlitic	—	Class 25 0.6015	Use RPM CALCULATOR pilot hole + grit	250–350 / 9.8–13.8	2–4 passes Stroke 5 mm past	#200 / #400 #600 fine burrs	Use RPM CALCULATOR pilot hole + grit	300–400 / 11.8–15.7	3–5 passes Stroke 5 mm past	#600 → #1000	Air preferred
K	Gray cast iron (GG)	Pearlitic / martensitic	—	Grade H20 36037	Use RPM CALCULATOR pilot hole + grit	250–350 / 9.8–13.8	2–4 passes Stroke 5 mm past	#150 / #200 / #400	Use RPM CALCULATOR pilot hole + grit	300–400 / 11.8–15.7	3–5 passes Stroke 5 mm past	#400 → #800 #1000 / #1200 final	Air preferred
K	Nodular cast iron (GGG)	Ferritic	—	60-40-18 0.7043	Use RPM CALCULATOR pilot hole + grit	300–400 / 11.8–15.7	2–3 passes Stroke 5 mm past	#400 / #600	Use RPM CALCULATOR pilot hole + grit	350–450 / 13.8–17.7	3–4 passes Stroke 5 mm past	#800 → #1200	Air preferred
K	Nodular cast iron (GGG)	Pearlitic	—	F33500 0.705	Use RPM CALCULATOR pilot hole + grit	250–350 / 9.8–13.8	2–4 passes Stroke 5 mm past	#150 / #200 / #400	Use RPM CALCULATOR pilot hole + grit	300–400 / 11.8–15.7	3–5 passes Stroke 5 mm past	#400 → #800 #1000 / #1200 final	Air preferred
K	Malleable cast iron	Ferritic	—	A47 0.8135	Use RPM CALCULATOR pilot hole + grit	300–400 / 11.8–15.7	2–3 passes Stroke 5 mm past	#400 / #600	Use RPM CALCULATOR pilot hole + grit	350–450 / 13.8–17.7	3–4 passes Stroke 5 mm past	#800 → #1200	Air preferred
K	Malleable cast iron	Pearlitic	—	A220 Class 0.8155	Use RPM CALCULATOR pilot hole + grit	250–350 / 9.8–13.8	2–4 passes Stroke 5 mm past	#150 / #200 / #400	Use RPM CALCULATOR pilot hole + grit	300–400 / 11.8–15.7	3–5 passes Stroke 5 mm past	#400 → #800 #1000 / #1200 final	Air preferred
N	Aluminum-wrought alloys	—	Not hardenable	5005 3.3315	Use RPM CALCULATOR pilot hole + grit	350–500 / 13.8–19.7	2 passes Stroke 5 mm past	#800 / #1200	Use RPM CALCULATOR pilot hole + grit	400–550 / 15.7–21.7	3–4 passes Stroke 5 mm past	#1200 → #2000	Wet / MQL
N	Aluminum-wrought alloys	—	Hardenable	7075 3.4365	Use RPM CALCULATOR pilot hole + grit	350–500 / 13.8–19.7	2 passes Stroke 5 mm past	#800 / #1200	Use RPM CALCULATOR pilot hole + grit	400–550 / 15.7–21.7	3–4 passes Stroke 5 mm past	#1200 → #2000	Wet / MQL
N	Aluminum-cast alloys	≤12% Si	Not hardenable	518 3.3292	Use RPM CALCULATOR pilot hole + grit	350–500 / 13.8–19.7	2 passes Stroke 5 mm past	#800 / #1200	Use RPM CALCULATOR pilot hole + grit	400–550 / 15.7–21.7	3–4 passes Stroke 5 mm past	#1200 → #2000	Wet / MQL
N	Aluminum-cast alloys	≤12% Si	Hardenable	515 3.3241	Use RPM CALCULATOR pilot hole + grit	350–500 / 13.8–19.7	2 passes Stroke 5 mm past	#800 / #1200	Use RPM CALCULATOR pilot hole + grit	400–550 / 15.7–21.7	3–4 passes Stroke 5 mm past	#1200 → #2000	Wet / MQL
N	Aluminum-cast alloys	>12% Si	High temperature	390 —	Use RPM CALCULATOR pilot hole + grit	350–500 / 13.8–19.7	2 passes Stroke 5 mm past	#600 / #800	Use RPM CALCULATOR pilot hole + grit	400–550 / 15.7–21.7	3–4 passes Stroke 5 mm past	#1000 → #1200	Wet / MQL
N	Copper alloys	>1% Pb	Free cutting	C36000 2.0375	Use RPM CALCULATOR pilot hole + grit	300–450 / 11.8–17.7	2 passes Stroke 5 mm past	#800 / #1200	Use RPM CALCULATOR pilot hole + grit	350–500 / 13.8–19.7	3–4 passes Stroke 5 mm past	#1200 → #2000	Air / Wet
N	Copper alloys	—	Brass	C22000 2.023	Use RPM CALCULATOR pilot hole + grit	300–450 / 11.8–17.7	2 passes Stroke 5 mm past	#800 / #1200	Use RPM CALCULATOR pilot hole + grit	350–500 / 13.8–19.7	3–4 passes Stroke 5 mm past	#1200 → #2000	Air / Wet
N	Copper alloys	—	Electrolytic copper	C63000 2.0966	Use RPM CALCULATOR pilot hole + grit	300–450 / 11.8–17.7	2 passes Stroke 5 mm past	#800 / #1200	Use RPM CALCULATOR pilot hole + grit	350–500 / 13.8–19.7	3–4 passes Stroke 5 mm past	#1200 → #2000	Air / Wet
N	Non-metallic	Duroplastics, fiber plastics	—	Bakelite —	Use RPM CALCULATOR pilot hole + grit	250–350 / 9.8–13.8	2 passes Stroke 5 mm past	#2000 / #3000	Use RPM CALCULATOR pilot hole + grit	300–400 / 11.8–15.7	3–4 passes Stroke 5 mm past	#3000 → #6000	Dry air + extraction
N	Non-metallic	Hard rubber	—	Ebonite —	Use RPM CALCULATOR pilot hole + grit	250–350 / 9.8–13.8	2 passes Stroke 5 mm past	#2000 / #3000	Use RPM CALCULATOR pilot hole + grit	300–400 / 11.8–15.7	3–4 passes Stroke 5 mm past	#3000 → #6000	Dry air + extraction
S	High temperature alloys	Fe based	Annealed	330 1.4864	Use RPM CALCULATOR pilot hole + grit	200–300 / 7.9–11.8	2–4 passes Stroke 5 mm past	#150 / #200 / #400	Use RPM CALCULATOR pilot hole + grit	250–350 / 9.8–13.8	3–5 passes Stroke 5 mm past	#400 → #800 #1000 / #1200 final	Wet recommended
S	High temperature alloys	Fe based	Hardened	S590 1.4977	Use RPM CALCULATOR pilot hole + grit	200–300 / 7.9–11.8	2–4 passes Stroke 5 mm past	#150 / #200 / #400	Use RPM CALCULATOR pilot hole + grit	250–350 / 9.8–13.8	3–5 passes Stroke 5 mm past	#400 → #800 #1000 / #1200 final	Wet recommended
S	High temperature alloys	Ni or Co based	Annealed	Incoloy 825 2.4858	Use RPM CALCULATOR pilot hole + grit	200–300 / 7.9–11.8	2–4 passes Stroke 5 mm past	#150 / #200 / #400	Use RPM CALCULATOR pilot hole + grit	250–350 / 9.8–13.8	3–5 passes Stroke 5 mm past	#400 → #800 #1000 / #1200 final	Wet recommended
S	High temperature alloys	Ni or Co based	Hardened	Inconel 718 2.4668	Use RPM CALCULATOR pilot hole + grit	200–300 / 7.9–11.8	2–4 passes Stroke 5 mm past	#150 / #200 / #400	Use RPM CALCULATOR pilot hole + grit	250–350 / 9.8–13.8	3–5 passes Stroke 5 mm past	#400 → #800 #1000 / #1200 final	Wet recommended
S	High temperature alloys	Ni or Co based	Cast	Nimocast K24 2.4674	Use RPM CALCULATOR pilot hole + grit	200–300 / 7.9–11.8	2–4 passes Stroke 5 mm past	#150 / #200 / #400	Use RPM CALCULATOR pilot hole + grit	250–350 / 9.8–13.8	3–5 passes Stroke 5 mm past	#400 → #800 #1000 / #1200 final	Wet recommended
S	Titanium alloys	—	Pure	Titanium G.1 3.7024	Use RPM CALCULATOR pilot hole + grit	200–300 / 7.9–11.8	2–4 passes Stroke 5 mm past	#150 / #200 / #400	Use RPM CALCULATOR pilot hole + grit	250–350 / 9.8–13.8	3–5 passes Stroke 5 mm past	#400 → #800 #1000 / #1200 final	Wet recommended
S	Titanium alloys	—	Alpha+beta alloys, hardened	Titanium G.5 3.7165	Use RPM CALCULATOR pilot hole + grit	200–300 / 7.9–11.8	2–4 passes Stroke 5 mm past	#150 / #200 / #400	Use RPM CALCULATOR pilot hole + grit	250–350 / 9.8–13.8	3–5 passes Stroke 5 mm past	#400 → #800 #1000 / #1200 final	Wet recommended
H	Hardened steel	—	Hardened	HARDOX 500 —	Use RPM CALCULATOR pilot hole + grit	300 / 11.8	2 passes minimum Stroke 5 mm past	#150 / #200 / #400	Use RPM CALCULATOR pilot hole + grit	300 / 11.8	3–4 passes Stroke 5 mm past	#400 → #800 #1000 / #1200 final	Wet preferred
H	Hardened steel	—	Hardened	HARDOX Extreme —	Use RPM CALCULATOR pilot hole + grit	300 / 11.8	2 passes minimum Stroke 5 mm past	#150 / #200 / #400	Use RPM CALCULATOR pilot hole + grit	300 / 11.8	3–4 passes Stroke 5 mm past	#400 → #800 #1000 / #1200 final	Wet preferred
H	Chilled cast iron	—	Cast	A532 IIIA 25% Cr 0.965	Use RPM CALCULATOR pilot hole + grit	300 / 11.8	2 passes minimum Stroke 5 mm past	#150 / #200 / #400	Use RPM CALCULATOR pilot hole + grit	300 / 11.8	3–4 passes Stroke 5 mm past	#400 → #800 #1000 / #1200 final	Wet preferred
H	Hardened cast iron	—	Hardened	A532 IID 20% CrMo 0.9645	Use RPM CALCULATOR pilot hole + grit	300 / 11.8	2 passes minimum Stroke 5 mm past	#150 / #200 / #400	Use RPM CALCULATOR pilot hole + grit	300 / 11.8	3–4 passes Stroke 5 mm past	#400 → #800 #1000 / #1200 final	Wet preferred

Starting parameters: Use the RPM calculator by pilot-hole diameter + grit. Cross-hole brushing does not use DOC. Pull the brush back past the intersection and push it forward past the intersection. Insert and remove the brush only while stationary. Validate parameters on the actual component.

UFIBER® Cross-Hole Brush

Grit Selection Guide

Choose grit according to burr strength, edge-control requirement and desired finish. For cross-hole work, always combine grit selection with the RPM calculator based on pilot-hole diameter and grit.

#150GHeavy cutHeavy resistant burrs
Hard / abrasive materials

#200PAggressiveGeneral hard-material deburring
Heat-treated steels / difficult alloys

#400VControlled deburringSmaller burrs
Better edge control

#600OGeneral deburringSteel / stainless / cast iron
Balanced cutting action

#800BFine burrsReduced edge rounding
Transition to finishing

#1000WFine finishingInner-diameter finishing
Controlled surface improvement

#1200RFine polishingFinal metal finishing
Non-ferrous applications

#2000MVery fineAluminum / delicate surfaces
Low cutting aggression

#3000ZUltra-fineNon-metallic materials
High-finish applications

#6000AMicro-finishFinal polishing
Plastics / composites

CROSS-HOLE GRIT LOGIC Burr Severity & Required Finish

Application Condition	Primary Recommendation	Alternative / Progression	Cross-Hole Guidance
Heavy resistant burr / hard abrasive material	#150 (G)	#200 (P) → #400 (V)	Use the coarsest grit only when the burr and edge condition require it. Select RPM by pilot-hole diameter + grit and verify brush expansion.
General hard-material deburring	#200 (P)	#400 (V) for smaller burrs	Suitable as the general starting family for heat-treated steels and difficult alloys when #150 is unnecessarily aggressive.
General steel / stainless / cast iron	#400 (V) / #600 (O)	#800 (B) for fine burrs	Use #400 for stronger cutting action, #600 for balanced deburring, and #800 where edge rounding must be minimized.
Fine burr / precision edge	#800 (B)	#1000 (W)	Use finer grit when the burr is small and the main objective is controlled edge conditioning or improved internal finish.
Polishing / finishing metals	#1000 (W) / #1200 (R)	#2000 (M) where a finer finish is needed	Use after burr removal when the objective shifts from cutting power to surface finish.
Non-metallic / very fine finishing	#2000 (M) / #3000 (Z)	#6000 (A) final	Use for plastics, hard rubber, composites and micro-finish applications with dry-air extraction where appropriate.

Important: #150, #200 and #400 are alternative starting grits for hard or abrasive applications — not a mandatory sequence. For cross-hole brushing, the selected grit must always be paired with the correct RPM for the pilot-hole diameter + grit. Insert and remove the brush only while stationary; use forward/back stroke through the intersection rather than DOC.

Controlling Cross-Hole Deburring & Finishing Performance

Controlling
Cross-Hole
Deburring
and
Finishing
Performance

Operation Type	Grit Selection	Feed	RPM	Passes	Effect / Purpose
1 Deburring Power Up	Coarser grit	↓	↑	↑	More aggressive burr removal, but increased brush wear and greater risk of edge rounding.
2 Deburring Power Down / Tool Life Up	Finer grit	↑	↓	↓	Softer contact, reduced material removal, lower brush wear and longer tool life.
3 Finishing Quality Up	Finer grit	↓	↔	↑	Improved internal finish and tool-mark reduction with controlled material removal.
4 Gentle Finishing / Stock Removal Down	Finest suitable grit	↑	↓	↓	Minimal stock removal and reduced risk of excessive edge rounding.

Important: Stroke must always extend completely past the cross-hole intersection.
Adjust the number of passes — not the stroke distance. Start with two directional passes and optimize gradually.

↔ Keep the RPM unchanged while improving finishing quality mainly by using a finer grit, lower feed and more passes.

Important: Keep the stroke long enough to pass completely through the intersection. Tune the process with passes, feed, grit and RPM.

UFIBER® Cross-Hole Brush — RPM Calculator

Cross-Hole Brush Safety Precautions & Instructions

⚠

Tool & Machine Safety

Stay within the recommended and absolute maximum RPM.
Use the brush inside the cylinder/workpiece area.
Use centered, properly aligned bores and cross holes.
Grip the shank by at least 30 mm.
Use a matching chuck and controlled-RPM equipment.
Stop immediately if vibration or abnormal behavior occurs.

✓

Operator & Work Area Safety

Wear appropriate eye, respiratory, hand and hearing protection.
Use barriers and suitable dust/particle collection.
Keep floors clear of oil, water, chips and debris.
Do not use near flammable liquids or explosive atmospheres.
Avoid prolonged fixed-point machining and hot-surface contact.

CAUTION: Rotating brushes, fragments, burrs and machining debris can cause serious injury. Validate the process before production use.

UFIBER® Cross-Hole Brush — 3D Models

Cross-Hole Brush STEP Models

For machine simulation, programming and tooling preparation.

Cross-Hole Brush UFIBER® – Technical Information & Application Guide

Features

Centrifugal Expansion

Internal Burr Removal

Residue & Scale Removal

Ceramic Cutting Edges

Wide Material Coverage

CNC & Robotic Ready

Cross-Hole Brush Product Range

Grit Selection by Burr Condition & Material

How to Use the UFIBER® Cross-Hole Brush

Insert While Stationary

Start Rotation Inside the Bore

Process Through the Cross-Hole

Pull Back While Processing

Push Forward While Processing

Stop Rotation

Reverse Direction & Repeat

Remove While Stationary

How to Work with the UFIBER® Cross-Hole Brush — Video Demonstrations

UFIBER Cross-Hole Brush

How to Use the UFIBER® Cross-Hole Brush

Cross-Hole Brush Diameter Control

RPM Increases Working Diameter

Coarser Grits

Finer Grits

Using the Cross-Hole Brush with Different Hole Geometries

T-Shaped Hole

Cross-Shaped Hole

UFIBER® Cross-Hole Brush — Machining Recommendations

Machining Recommendations

Grit Selection Guide

Controlling Cross-Hole Deburring & Finishing Performance

Controlling Cross-Hole Deburring and Finishing Performance

UFIBER® Cross-Hole Brush — RPM Calculator

Cross-Hole Brush Safety Precautions & Instructions

Tool & Machine Safety

Operator & Work Area Safety

UFIBER® Cross-Hole Brush — 3D Models

Cross-Hole Brush STEP Models

Controlling
Cross-Hole
Deburring
and
Finishing
Performance