Delta Drill Press 11 990 C: Specs, Capacity, Parts, and Owner Notes

If you have been shopping for a used Delta bench press, you may have seen the model written as 11-990, 11-990C, or 11-990 Type 1 or Type 2, and wondered whether those suffixes matter. They do, but not in the way most people fear. The letter and type markings on a Delta 11-990 identify the production version of the same 12-inch bench press, and knowing how to read them is the difference between ordering a part that fits and one that does not. This is a specs, capacity, and parts reference for the Delta 11-990 C, written to help you buy and maintain the right version.

The Delta 11-990 is a 12-inch benchtop drill press with a 1/3 HP induction motor on 115V (about 6 amps), five spindle speeds (620, 1,100, 1,720, 2,340, and 3,100 RPM) via a stepped-pulley belt, a 1/2-inch keyed chuck, and roughly 2-3/8 inches of spindle travel. The letter or type suffix (such as C or Type 2) marks the production run, which affects some replacement parts. It is discontinued, so support relies on archived manuals, parts diagrams, and standard consumables.

Straight answer: the 11-990 C shares its core specs with every other 11-990, so its capability is identical, a capable 12-inch bench press for wood and light metal. The suffix matters only when you order model-specific parts, so always match it against the parts diagram for your version before buying anything.

Specs at a glance

The headline numbers are the same across 11-990 versions. The 12-inch swing reaches the center of a 12-inch board, the five speeds run from 620 to 3,100 RPM off a stepped-pulley belt, and the 1/3 HP induction motor runs quietly on standard household current. The 1/2-inch keyed chuck and the roughly 2-3/8 inches of quill travel round out the working numbers. This places the 11-990 firmly in the wood-and-light-metal class: smooth and accurate for its size, not built for heavy steel or large-diameter bits.

The speed chart lives inside the belt cover, and you change speed by moving the belt across the pulley steps, slow for large bits and metal, fast for small bits in wood.

Why the suffix matters for parts

Over a model’s life, Delta revised small details, pulley design, switch style, minor castings, and marked those revisions with type numbers and occasionally a letter. The result is that two presses both labeled 11-990 can need slightly different model-specific parts. That is exactly why searching “11-990 parts” alone is not enough: you match the full designation, including the type, against the corresponding parts diagram. Archived Delta parts lists are organized by model and type for this reason. Read the plate on your machine, note the complete number, and use it to confirm fit before ordering anything Delta-specific.

The good news is that this only affects proprietary parts. The routine consumables are shared and easy to find.

Parts and consumables

Because the 11-990 is discontinued, keep the wear items current with standard parts. An aging V-belt is replaced by measuring the old loop and matching the size. The 1/2-inch keyed chuck wears; a 5/8-inch keyed chuck with an MT2 arbor replaces it once you confirm your spindle taper, and a lost key is a universal ratcheting chuck key. A drill press vise squares small parts on the table. What you cannot easily replace are model-and-type-specific structural parts, which is why matching the suffix and buying a complete machine both matter.

The honest flaws

Two honest points. First, the suffix system, while logical, is a nuisance: get it wrong and a proprietary part will not fit, so you must be disciplined about reading the plate. Second, as a discontinued machine the 11-990 C has no factory warranty and limited structural spares, so a cracked casting or pulley specific to your type can be hard to source. Buy a complete, sound example rather than a project, and accept that the 1/3 HP, five-speed design is durable but not powerful.

Who should own one, and who should not

Own an 11-990 C if you want a 12-inch cast-iron bench press for wood and light metal, you have matched the full model and type for parts, and you found a complete, smooth-running example. It is a dependable machine once you have the right version identified.

Skip it if you need heavy-steel power or deep single-pull holes (choose a 3/4 HP floor press), or if you are not willing to track the type designation for parts. Do not buy an incomplete machine assuming any 11-990 part will fit, because the suffix can prove you wrong.

Conclusion: same machine, mind the suffix

The Delta 11-990 C is the familiar 12-inch bench press with a version marking that only matters at parts-ordering time.

• 12-inch swing, 1/3 HP induction motor, five speeds (620 to 3,100 RPM), 1/2-inch chuck, ~2-3/8-inch travel.
• Capability is identical across 11-990 versions; the suffix affects only model-specific parts.
• Read the full model and type off the plate and match it to the parts diagram before ordering.
• Consumables are shared and easy; structural parts are version-specific and scarce, so buy complete.

FAQ

What does the C in 11-990 C mean? It is a production-version marking. The core specs match every 11-990, but the suffix and type can change which model-specific parts fit.

Does the C version perform differently? No. The 12-inch swing, 1/3 HP motor, and five speeds are the same. Capability is identical to other 11-990 versions.

How do I find the right parts? Read the full model and type off the nameplate and match it to the corresponding archived Delta parts diagram before ordering anything Delta-specific.

What are the spindle speeds? Five speeds: 620, 1,100, 1,720, 2,340, and 3,100 RPM, set by moving the belt across the pulley steps.

What chuck does it use? A 1/2-inch keyed chuck. Confirm your spindle taper before fitting a replacement.

Which parts are easy to replace? The V-belt, chuck, and chuck key are standard consumables. Match the belt by measuring the old one.

Is it still made? No. The 11-990 is discontinued, so parts come from archived diagrams, used donors, and standard consumables.

References

• Delta 11-990 12-inch Bench Drill Press Manual (PDF): https://www.mikestools.com/download/Delta_Drill_Press_Owners_Manuals/Delta_11-990.pdf
• Delta Drill Press owner’s manuals archive: https://www.mikestools.com/Delta-Drill-Press-Owners-Manuals
• Delta Machinery, manuals and parts support: https://www.deltamachinery.com/support/manuals