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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 W thread gas cylinder valves DIN 477
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W – Tapered Gas Cylinder Valve Thread
The threads on gas cylinders are defined in DIN 477. Since this is literally a potentially explosive topic, the specifications are strict and designed to prevent confusion and incorrect connections. Several thread types are used in this context and assigned to specific gas types. These include certain metric ISO threads, G pipe threads, and specific dimensions defined in the W gas cylinder thread standard. Everything you need to process this thread type is, of course, available from BAER.
Everything you need to know about the W gas cylinder valve thread
The W gas cylinder thread includes several very specific thread sizes that can be right- or left-handed. This provides an additional safety feature, as a left-hand external thread cannot be connected to a right-hand internal thread, and vice versa. Both tapered and cylindrical versions exist. The flank angle is 55°.
The tapered W thread with a 3:25 taper is available in 19.8 mm, 28.8 mm, and 31.3 mm diameters. Cylindrical versions are available in 21.8 mm, 24.32 mm, and 1" (25.4 mm) diameters.
W Thread – Our Product Range
The system of gas valve threads is complex, but at BAER, you can rely on us as always. Our product range includes taps and dies for processing all dimensions of this thread type.
Taps for the W gas cylinder valve thread
For tapping W threads, you can choose between forming taps and hand taps. Our forming taps in Form C are made of ground HSS and meet the highest demands. The straight flutes allow processing of through and blind holes – for blind holes, the depth should not exceed 1.5× the nominal diameter.
We also offer hand taps in a practical two-piece set consisting of a pre-tap and a finishing tap. These are ideal when working manually. Even without machinery, you can create precise threads with ease. These tools also use Form C with straight flutes.
Dies for the W gas cylinder valve thread
We also offer dies for all variants of the W valve thread. Whether cylindrical or tapered, right- or left-hand – our dies can handle any application. Use a suitable die holder and optional die guide for manual work, or mount them in a machine for powered cutting of external threads.
Discover tools and accessories for the tapered gas cylinder valve thread in the BAER online shop!
Even for complex topics like gas valve threads, BAER has you covered. You’ll find everything you need – in the usual BAER quality. If you have questions or get stuck, don’t hesitate to contact our customer service! We're available by phone or contact form.
Do you have any questions? We have the answers!
You'll quickly find the right answers in our FAQ - take a look!