SNK RB-Series

Est. $800,000 - $1,600,000 Updated 2026-10-03

Key Specifications

X Travel

4,000 mm (157.5 in) standard

Y Travel

2,500 mm (98.4 in)

Z Travel

1,200 mm (47.2 in)

Max Spindle

3,000 RPM

Table Size

1,800 mm x 1,800 mm (70.9 in x 70.9 in)

Spindle Power

37 kW (49.6 HP)

How much does the SNK RB-Series cost?

Estimated price range

Est.$800,000 - $1,600,000

Our best estimate for a cnc boring machine in this class — not a quote from SNK. Configuration moves it a long way.

Overview

The SNK RB-Series is listed as a CNC boring machine with a 130 mm (5.12 in) spindle running to 3,000 RPM on 37 kW (49.6 HP), over an 1,800 mm x 1,800 mm (70.9 in x 70.9 in) table that carries 30,000 kg (66,139 lb). SNK's current product pages do not show a model under this name; the table is unconfirmed by the maker and is given as the listed figures.

Travels are 4,000 mm (157.5 in) on X as standard, 2,500 mm (98.4 in) on Y and 1,200 mm (47.2 in) on Z, with a 500 mm (19.7 in) quill stroke on W. The B axis is listed with a resolution of 0.001 degrees, fine enough to turn a part around and bore from the opposite side on a common axis, provided the positioning accuracy of ±0.008 mm (±0.00031 in) holds on the machine in question.

Next to the larger boring machine on this site, this is the faster and shorter-reaching spindle. The FNC-150 is listed with a 150 mm (5.91 in) spindle, a 900 mm (35.4 in) quill stroke and a 2,000 RPM top speed, so the RB-Series gives up reach for spindle speed.

The table also carries a second set of rows that disagrees with the first on several points: a top speed of 6,000 RPM (4,500 RPM as an option), 40 tools with 120 as an option, and an X travel of 167.300 in with 285.430 in as an option. With both sets on the page, the spindle speed, travels and tool count of any real machine have to be taken from its own documents.

Full Specifications

Parameter	Value
Spindle Diameter	130 mm (5.12 in)
Max Spindle Speed	3,000 RPM
Spindle Motor Power	37 kW (49.6 HP)
Table Size	1,800 mm x 1,800 mm (70.9 in x 70.9 in)
Table Load Capacity	30,000 kg (66,139 lb)
X-Axis Travel	4,000 mm (157.5 in) standard
Y-Axis Travel	2,500 mm (98.4 in)
Z-Axis Travel	1,200 mm (47.2 in)
Quill Stroke W	500 mm (19.7 in)
B Axis Resolution	0.001 degrees
Positioning Accuracy	±0.008 mm (±0.00031 in)
CNC Control	Fanuc 30i-B
Machine Type	Machining Center
Num of Axes	4
Operation Type	CNC
CNC Brand	Fanuc 31i
Table Size L X W	157.500(L) x 78.740(W)
Table Size L X W Opt	236.220(L) x 78.740(W)
Max Workpiece Weight	33,000
Direction	Combination
Taper	# 50
Top RPM	6,000
Top RPM Opt	4,500
Hp	30.00
Hp Opt	50.00
Tool Carrier	ATC
Num Tools	40
Num Tools Opt	120
Tool Change Chip Time	0.00
Pallet Changer Available	Optional
Num Pallets	2
Num Axes	4
Num Axes Opt	5
U Axis	None
X1	167.300" Opt: 285.430"
Y1	114.000"
Z1	23.600"

Specifications compiled from manufacturer literature and industry references. Not independently verified against a published spec sheet — confirm with the manufacturer or an authorised dealer before making a purchasing decision.

Strengths & Limitations

Strengths

130 mm (5.12 in) spindle at 3,000 RPM with 37 kW (49.6 HP)
Table load capacity of 30,000 kg (66,139 lb) on an 1,800 mm x 1,800 mm (70.9 in x 70.9 in) table
B axis resolution of 0.001 degrees for bore-from-both-sides work
Listed positioning accuracy of ±0.008 mm (±0.00031 in)
Standard X travel of 4,000 mm (157.5 in) with 2,500 mm (98.4 in) of Y

Limitations

Quill stroke on W is 500 mm (19.7 in), which limits how deep a bore can be reached without moving the other axes
Z travel is 1,200 mm (47.2 in), short against 4,000 mm (157.5 in) of X
The table holds two sets of figures that conflict on top speed, tool count and X travel
A pallet changer is listed as optional, not standard

Best For

Boring and milling of heavy castings up to 30,000 kg (66,139 lb) Line boring from opposite sides using the 0.001 degree B axis Long workpieces within 4,000 mm (157.5 in) of X Bores within reach of a 500 mm (19.7 in) quill stroke

Frequently Asked Questions

01 What size is the RB-Series spindle?

The listed spindle diameter is 130 mm (5.12 in), with a maximum speed of 3,000 RPM and 37 kW (49.6 HP). The quill stroke on W is 500 mm (19.7 in). A second set of rows on the page gives a top speed of 6,000 RPM, so the speed needs confirming.

02 How heavy a part can the RB-Series table hold?

Table load capacity is listed as 30,000 kg (66,139 lb), and the table is 1,800 mm x 1,800 mm (70.9 in x 70.9 in). These are the listed figures and the maker has not confirmed them.

03 What are the axis travels of the RB-Series?

The main rows give 4,000 mm (157.5 in) on X as standard, 2,500 mm (98.4 in) on Y, 1,200 mm (47.2 in) on Z and a 500 mm (19.7 in) quill stroke on W. Another row gives an X travel of 167.300 in with 285.430 in optional, which does not match, so ask for the travels of the actual machine.

04 How does the RB-Series compare with the FNC-150?

On the listed figures the RB-Series has a 130 mm (5.12 in) spindle, 3,000 RPM and a 500 mm (19.7 in) quill. The FNC-150 has a 150 mm (5.91 in) spindle, a 2,000 RPM top speed and a 900 mm (35.4 in) quill. The RB-Series is the faster spindle; the FNC-150 reaches deeper.