The concise answer: No. M12x1.5 and 1220 are not the same designation. M12x1.5 specifies a metric screw thread (12 mm major diameter with a 1.5 mm pitch), while 1220 is not a universal thread designation on its own and usually depends on context such as length, a catalog code, or a part number.
Understanding what this means requires looking at how fasteners are described. Metric thread designations like M12x1.5 convey two essential dimensions the fit relies on: diameter and thread pitch. The sequence 1220, by contrast, can appear in catalogs in several ways and does not map directly to a standard thread form without additional information. Below is a breakdown of how these terms are used in practice.
Understanding M12x1.5
To grasp why M12x1.5 isn’t interchangeable with 1220, it helps to know what M12x1.5 communicates on its own.
Before listing the core details, note that the following items describe the standard meaning and typical usage for M12x1.5. They are not a substitute for a specific product datasheet, which may add length, material, coating, or tolerance details.
- Major diameter: 12 millimeters. This is the nominal outside diameter of the thread.
- Thread pitch: 1.5 millimeters. This is the distance from one thread crest to the next, along the axis.
- Thread form: ISO metric (denoted by the “M”); this is a fine-thread variant for M12, with M12x1.75 being a common coarse option.
- Length is separate: The designation M12x1.5 only describes the thread; the bolt, screw, or nut length must be specified separately (e.g., M12x1.5x20).
- Applications: Frequently used in assemblies for machinery, robotics, camera mounts, and automation hardware where a precise, robust thread is needed.
- Standards and tolerances: Real-world parts may specify tolerance classes (for example, 6g for external threads and 6H for internal) depending on the grade and the standard (such as ISO or DIN) used by the supplier.
In practice, you should verify the full spec from the supplier or datasheet to confirm length, material, coating, and tolerance—the thread size alone is only part of what you need for a proper fit.
What 1220 might refer to
Without more context, 1220 is not a universally recognized substitute for M12x1.5. In catalogs and online stores, it can appear in several ways and may be interpreted differently by vendors. Common possibilities include the following.
- A length indicator in shorthand: some listings compress diameter and length into a numeric code (for example, “12” for 12 mm diameter and “20” for 20 mm length). This is not standardized and varies by supplier.
- A catalog or part number: 1220 could be the supplier’s SKU or model code, which may refer to a specific head style, coating, or backing nut, rather than to the thread itself.
- A dimension pair in a non-thread context: in some hardware listings, numbers like 12 and 20 might describe mounting hole sizes, overall length, or other non-thread features.
- Occasional mislabeling or shorthand: it can occur that a listing incorrectly labels a part or omits the pitch, leading to confusion.
The key takeaway is that 1220, by itself, does not uniquely identify a thread size. To be sure you’re comparing apples to apples, you should obtain the full specification from the vendor or consult the product datasheet.
How to verify compatibility
If you’re trying to match a fastener to a mating part, use these steps to verify compatibility.
- Check the datasheet or product page for the full thread specification (diameter, pitch, length, tolerance, and material).
- Measure the existing thread with a thread pitch gauge and calipers when possible to confirm 12 mm diameter and 1.5 mm pitch.
- Clarify length and head type: a bolt labeled M12x1.5 may come in various lengths and head styles; ensure the length matches your assembly requirements.
- Confirm the tolerance class (for example, 6g/6H) and material/coating if environmental or load conditions are important.
When in doubt, ask the supplier for a complete re-checked part number or a drawing. Having the exact part number ensures you’re ordering the correct thread form and length, eliminating ambiguity around codes like 1220.
Summary
M12x1.5 is a defined metric thread size—12 mm in diameter with a 1.5 mm pitch—commonly used in a range of mechanical assemblies. The value 1220, by contrast, is not a standard thread designation and can represent a length, a catalog number, or another vendor-specific code. To ensure accuracy, always refer to the full datasheet or verify with the supplier, and when possible, measure or test the thread with appropriate tools before committing to a part.
What does M12 1.5 mean?
Find the closest match on the adjacent chart (thread O.D and pitch combine into a “thread callout” such as M12 x 1.5 indicating a 12mm O.D with 1.5mm pitch)
What do M12x1.5 lug nuts fit?
5 Lug Nuts - 20pcs OEM Wheel Lug Nuts Compatible with 2009-18 Focus/2012-18 Fusion/2013-2020 Escape/2018+ EcoSport/2011-19 Fiesta, Chrome Acorn Wheel Nuts.
Is m12x1.5 the same as 1/2/20?
M12-1.5 and 1/2"-20 threads are not going to be interchangeable. The diameter of an M12 thread is only going to be 0.4724" while 1/2" threads are going to be 0.500" in diameter.
What size are M12 lug nuts?
M12 (1.25, 1.5 or 1.75 mm thread pitch, with M12x1. 5 mm being the most common)