National 3B-B Hand Torch

The National 3B-B is a single-stage premix hand torch in National’s classic blowpipe lineage, the kind of compact, hand-held burner long common in scientific glasswork and entry-level torching. National positions it as having the same features as the 3A-B, including the leak-proof union that lets the tip and elbow rotate to suit the piece, and names the hose fitting as the only difference: the 3B-B takes 9/16-18 ‘B’-size threaded hose fittings.

What the premix flame gives you

The 3B-B is a premix torch: fuel and oxygen mix inside the body before reaching the flame. Premix burners are simple to light, stable, and predictable, and the flame is easy to read, part of why National blowpipes became such common teaching and laboratory tools. Our catalog lists the 3B-B for both soft glass and boro, with the tip deciding how much flame you have to work with. For how premix compares to surface-mix designs, see surface mix vs premix torches.

Who the 3B-B is for

As a hand torch, the 3B-B is held and maneuvered rather than mounted on the bench, which makes it well suited to assembly, spot heating, and mobile flame work, the kind of localized heating scientific glass often demands. It suits beginners through intermediates who want a simple, portable premix flame. The bench vs hand torch guide walks through when a hand torch is the right tool and when you’d want a bench burner instead.

Fittings, fuel, and oxygen

The 3B-B runs with oxygen or compressed air and uses National’s OX, HTM, HT, and HTC-3 series tips, and the installed tip sets both the flame and the oxygen draw, so an oxygen supply has to be matched to the tips you actually run. National lists city, natural, mixed, propane, and butane gas for its 3A and 3B blowpipes, and our catalog records propane, natural gas, and butane; the propane vs natural gas guide covers that choice, and how many LPM does my torch need helps with oxygen sizing. National doesn’t publish the 3B-B’s jet count or exact oxygen flow (LPM), so confirm those before you buy.

Before you buy

Budget for the whole system, not just the torch: oxygen or compressed air, the correct propane or natural-gas regulator, flashback protection matched to your torch and gas supply, the right National tip, didymium or boro-rated eyewear matched to your glass, and ventilation. New to plumbing a torch? Start with the fittings, hoses & connectors guide and the glass torch safety setup guide.

Editor’s note: spec details reflect National’s own product materials, including the fuel list and tip series above; we do not record operating pressures for this torch. National publishes a list price (the 3B-B base torch is $163.30 on its 2024 price list), but not the jet count or exact oxygen flow (LPM), so confirm those specifics with National before purchasing.