DMG MORI SV-503B
Manufacturer specifications, what it is built to do, the years we have seen them listed, what tooling fits, and what to check on one. MTE also buys them outright.
What the DMG MORI SV-503B is
The DMG MORI SV-503B is a CNC vertical machining center — a machine for milling, drilling and tapping on a fixed table with a vertical spindle — the general-purpose workhorse of most shops. The manufacturer publishes a x-axis travel of 1,020 mm (40.2 in.).
What it is built to do
From the figures the manufacturer publishes, a DMG MORI SV-503B suits:
- work up to the published 1,200 kg (2,640 lb.) table rating
- MAS BT-40 [CAT-40] (SV-503B/40) tooling at up to 10,000 [20,000] min-1 (SV-503B/40)
Selling a used DMG MORI SV-503B
Mori Seiki's 2001 SV series page set three machines side by side, the SV-403, the SV-503 and the SV-503B, and named direct drive spindles and Mori Seiki's own servo mechanisms as the basis of the line. The B model shares the SV-503's 510 mm (20.1 in.) Y and Z strokes but travels 1,020 mm (40.2 in.) in X against 800 mm, on a table of 1,320 x 600 mm against 1,100 x 600 mm. If the plate is gone, those figures tell the two apart.
Each SV-503B was built as a /40 or a /50. The 2002 series index gives the SV-503B/40 a 10,000 min-1 spindle with 20,000 min-1 in the option brackets, and the SV-503B/50 a 6,000 min-1 spindle with 10,000 min-1 as its option. Both carry the same travels, 1,020 by 510 by 510 mm, and the same table. Between them there are four spindle builds under one model name. Read the full designation off the plate and run the spindle to its top speed to show which one this is.
For the /40, Mori Seiki's 2003 sheet lists a spindle drive motor of 22 kW for 30 minutes and 18.5 kW continuous (30/24.8 HP), and 18.5/15 kW for the 20,000 min-1 spindle. The magazine has 30 pockets, with 40 or 60 pocket versions listed as options, and tool to tool change is given as 0.9/1.4 seconds, footnoted for tools over 8 kg (17.6 lb.) on the 12 kg tool mass specification. Note which spindle and which tool mass setting the machine was ordered with.
The /50 sheet from the same year keeps the 22/18.5 kW motor, the 1,200 kg (2,640 lb.) table load and the 42 m/min (1,653.5 ipm) rapid traverse. Its magazine holds 30 tools with 40 as the option, and its tool to tool time is 2.0/3.0 seconds, measured with tools of 10 kg (22 lb.) or heavier. It stands 3,020 mm (118.9 in.) tall on a floor space of 2,885 x 2,767 mm, figures worth giving to anyone planning where it will go.
Mori Seiki printed CAT-40 in option brackets beside MAS BT-40 for the /40 spindle, so either shank may be in the machine you are selling. State which one the spindle and its drawbar are set up for, give the count of holders and pull studs of that standard that go with it, and keep any holders of the other standard out of the count. The same page puts a 20,000 min-1 spindle in the option brackets, so give the spindle speed on the same line as the shank.
By Mori Seiki's 2009 vertical machining center index, the lineup ran to the NV, NMV, DuraVertical, VS, SVL, MV, ACCUMILL, NVD and ULTIMILL-V series, with no SV models among them. A buyer is looking at a machine from an earlier lineup, so gather the manuals, the electrical drawings, a parameter printout and any service records, and hand them over with the machine.
Sources: Mori Seiki Co., Ltd., archived copy from 2001, read November 1, 2026; Mori Seiki Co., Ltd., archived copy from 2002, read November 1, 2026; Mori Seiki Co., Ltd., archived copy from 2003, read November 1, 2026; Mori Seiki Co., Ltd., archived copy from 2003, read November 1, 2026; Mori Seiki Co., Ltd., archived copy from 2002, read September 16, 2026; Mori Seiki Co., Ltd., archived copy from 2009, read September 16, 2026; Mori Seiki Co., Ltd., archived copy from 2003, read November 1, 2026; Mori Seiki Co., Ltd., archived copy from 2002, read September 16, 2026.
DMG MORI SV-503B specifications
Sources: archived manufacturer page, archived manufacturer page.
What fits a DMG MORI SV-503B
Each of these follows from a published specification above, which is named beside it.
40-taper toolholders
This is a 40-taper spindle — the 7:24 steep taper that CAT-40, BT-40 and DIN 69871 (SK-40) holders all share. They share the taper and nothing else that matters: the retention knob and the flange form differ between those standards, so holders do not swap between them without changing pull studs. Knowing which standard a machine was tooled for is worth doing before the holders are packed. The manufacturer names CAT and BT (JIS/MAS 403) for this machine.
Derived from — Spindle taper: MAS BT-40 [CAT-40] (SV-503B/40)
50-taper toolholders
This is a 50-taper spindle — the 7:24 steep taper that CAT-50, BT-50 and DIN 69871 (SK-50) holders all share. They share the taper and nothing else that matters: the retention knob and the flange form differ between those standards, so holders do not swap between them without changing pull studs. Knowing which standard a machine was tooled for is worth doing before the holders are packed. The manufacturer names CAT and BT (JIS/MAS 403) for this machine.
Derived from — Spindle taper: MAS BT-50 [CAT-50] (SV-503B/50)
What years the DMG MORI SV-503B was built
The 2 units we have seen listed were all 2001. Observed across 25 marketplaces, not a manufacturer build record.
DMG MORI SV-503B machines on the market now
We track listings across 25 used-machinery marketplaces, and every competitor in this market is one of them, so this is a view none of them can produce for themselves. Right now there are 2 units of this exact designation on the market, drawn from 1 source. That is a thin market for this designation, which usually works in a seller’s favor.
We count only listings whose model is spelled as this machine’s own designation. Near spellings that may be a different variant are excluded rather than counted, so this is a floor on what is out there, not a total.
What to check on a DMG MORI SV-503B
The same list whichever side of the deal you are on.
- SV-503 or SV-503B. The plain SV-503/40 travels 800 mm in X, on a table of 1,100 x 600 mm rated for 1,000 kg (2,200 lb.). Measure the X stroke and the table before listing the machine as a B.
- Spindle at its rated top speed. The /40 is rated 10,000 min-1, or 20,000 min-1 with the option. Run it up in steps and hold it near the top for a few minutes while listening at the head; Mori Seiki notes that the clamping device, jig and tool can keep a spindle below its maximum.
- Pockets in the magazine. The 2002 /40 spec page lists 30 tools as standard with 40, 60 and 80 tool magazines in brackets. Go round the magazine pocket by pocket, cycle the carousel through all of them, and note any pocket that does not grip its holder.
- Timing a tool change. Time several tool to tool changes on a /40 and set them against the 0.9/1.4 second figure on the sheet. Its footnote ties that figure to tools over 8 kg on the 12 kg tool mass specification and to a two-face constrained tool, so note whether the spindle takes two-face contact holders and write down the times you get.
- Rapids on all three axes. Rapid traverse on the /50 sheet is 42 m/min (1,653.5 ipm). Send X, Y and Z end to end at full rapid and listen for any change in sound along each stroke. Watch the way covers fold and extend over the whole stroke too.
- The 1,320 x 600 mm table. The work surface measures 1,320 x 600 mm and carries up to 1,200 kg. Clean it, photograph the surface and the T-slots, and list any vise, fixture plate or rotary table that stays with it.
- Height of the /40. Mori Seiki gives the /40 a machine height of 2,850 mm (112.2 in.) and a floor space of 2,885 x 2,659 mm (113.6 x 104.7 in.). Measure your unit as it stands, with any chip conveyor, and pass the figures on.
Sources: Mori Seiki Co., Ltd., archived copy from 2003, read November 1, 2026; Mori Seiki Co., Ltd., archived copy from 2003, read November 1, 2026; Mori Seiki Co., Ltd., archived copy from 2002, read September 16, 2026; Mori Seiki Co., Ltd., archived copy from 2003, read November 1, 2026; Mori Seiki Co., Ltd., archived copy from 2002, read September 16, 2026.
Machines buyers cross-shop with the DMG MORI SV-503B
Other CNC vertical machining centers in this directory, closest first on x-axis travel.
Mazak FJV-250
- X-axis travel
- 40.16"
- Y-axis travel
- 20.08"
- Z-axis travel
- 18.11"
- Spindle taper
- BT40
Okuma MU-6300V
- X-axis travel
- 925 (36.42)
- Y-axis travel
- 1,050 (41.34) (+100 ATC movements)
- Z-axis travel
- 600 (23.62)
- Spindle taper
- 7/24 taper No.40 <HSK-A63>
Mazak VTC-200B
- X-axis travel
- 44.09″
- Y-axis travel
- 20.08″
- Z-axis travel
- 20.08″
- Spindle taper
- #40
Dealer-sourced figures, not manufacturer published.
The rest of the CNC vertical machining centers in this directory: Mazak VCN 410B-II
Browse the whole CNC Vertical Machining Centers (VMC) catalog, or see everything we buy from DMG MORI.
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