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Taps & Dies
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Thread standards
- M - metric regular thread
- MF - metric fine thread
- G (BSP) - pipe thread
- UNC - American coarse thread
- UNF - American fine thread
- UNEF - amer. Extra fine thread
- UN - amer. with special pitch
- UNS - amer. with special pitch
- BSW - british coarse thread
- BSF - British fine thread
- Tr - trapezoidal thread
- Rd - knuckle thread
- NPT - amer. taper pipe thread
- NPTF - amer. taper pipe thread
- NPS - amer. cyl. pipe thread
- Rc (BSPT) - taper pipe thread
- Rp (BSPP) - cyl. pipe thread
- Vg - valve thread
- BA - brit. assn. Thread
- BSB - BSC - brit. std. thread
- W - taper gas cylinder valves
- Electrical and cable thread
- Bicycle and pedal thread
- Photo and C-Mount Thread
- Mini and nano threads (< 2mm)
- PG - steel conduit thread
- S - buttress thread
- RMS - microscope thread
- MJ, UNJC, UNJF - Aviation
- STI thread (thread inserts)
- Special thread
- Operating tools
- Lubricant
- Thread restoration tools
- Countersink
- Step drills
- Thread gauges
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Thread standards
- BaerCoil/BaerFix
- Drill chucks
- Twist drill bits
Screw taps for UNS Thread with special pitch ANSI B1.1
Toolfinder
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UNS – American Thread with Special Pitch
The UNS unified thread belongs to the American thread standards summarized in the Unified Thread Standard (UTS). Unlike the well-known coarse or fine threads from the USA such as UNC or UNF, this thread type has a special feature. The letter S in the abbreviation stands for Special, and the thread is indeed used only in very special cases. Accordingly, its applications are rare. In our online shop, you’ll of course still find the right tool if you ever need a UNS tap or a UNS die.
Everything You Need to Know About the UNS Thread (ANSI/ASME B 1.1) of the Unified Thread Series
First of all, the UNS thread fits well into the series of other American thread types. It is an inch-based thread with a flank angle of 60° and a pitch defined in threads per inch (TPI = threads per inch). It is defined according to the ANSI/ASME B1.1-2003 standard.
In the associated table, threads with a diameter of less than 1/4″ are numbered; for all larger diameters, the thread designation follows the schema diameter – TPI – abbreviation, e.g., 1/4″ – 24 UNS or 7/8″ – 10 UNS.
The special feature of the UNS thread lies in the combinations of pitch, diameter, and engagement length. It is a sort of reservoir for unusual and rare combinations that cannot be found elsewhere and were designed for very specific applications. Thus, in the UNS table, you will find multiple entries with the number 10 or 12 – there are simply several threads with the same outer diameter.
It is recommended to use the UNS thread only when truly necessary and not to base new designs on it. For most applications, suitable pitch-diameter combinations can be found within the common tables of UNC, UNF, or UNEF threads. However, if you ever come across a part with a UNS thread, we have the right tool for you.
UNS Threads – Our Product Range
In the BAER online shop, we offer the right tools to work easily and precisely on both UNS external and internal threads. We are committed to equipping you with all the necessary tools, especially for rare thread types.
UNS Machine Taps
To re-cut a UNS internal thread or effortlessly produce one in a suitable core hole, you can use our machine taps. We offer these in two variants. The Form C tools have straight flutes and are suitable for both blind and through holes. They are manufactured from high-quality HSSG for precise results and long tool life.
Perfect for through holes in medium and long-chipping materials is our UNS machine tap of Form B with roll chamfer. High-alloy HSSE steel provides special hardness and handles difficult cutting tasks with ease.
UNS Dies
Of course, we also have the right tools for UNS external threads. Our HSS dies are robust, precise, and available in many sizes. To cut a UNS external thread by hand, you need a suitable die stock. With an appropriate adapter, the tool can also be easily clamped in most stationary drilling machines for machine use.
Discover Tools and Accessories for UNS (Unified National Special) Threads in the BAER Online Shop!
At BAER you will find what you need – even for rare thread types like the UNS thread! Take a look at our online shop and see for yourself. Do you need help selecting the right tool or have further questions? Then our customer service is always there for you. Feel free to contact us by phone or via our contact form.
Do you have any questions? We have the answers!
You'll quickly find the right answers in our FAQ - take a look!