![]() JIS metric thread hole strips more readily with ISO metric screw than ISO metric thread hole tolerances - these can introduce subtle differences between otherwise identical standards, eg.multistart threads have lead (distance the screw travels on single turn) equal pitch times number of starts common on faster leadscrews, enclosure lids/caps, and some self-tapping screws.most threads are single-start, forming a single helix here the pitch equals the lead.most common is right-handed thread, RH, considered default when not specified explicitly LH or left stands for left-handed thread, usually used where direction of rotation would tend to unscrew RH.pipe threads often exist in straight and tapered forms - BSPP vs BSPT/BSPTr (G vs R), NPS vs NPT.flat crest/root are more friendly to manufacture, cheaper, the edges can accommodate some rounding of the tools by wear.flat crest, round root for UNJ and MJ forms, "flavors" of standards.flat for metric and US and for translation screws, for truncated Whitworth for fasteners the root is usually slightly round or radiused to avoid stress concentration.crest/root forms (flat and how wide, or round and with what radius).for translation screws, 29° for ASME, 30° for trapezoid, 60° for truncated 60°.typically 60° for metric and US series, 55° for Whitworth, 47.5° for BA.Thread form defines the shape of the thread: ![]() UNC,UNF,UNEF,UNS: like metric, but dia/pitch imperialīSF: British Standard Fine, like Whitworth but finer pitchīSC: British Standard Cycle, CEI Thread angle 60°, fine pitch, 1/4" and above all at 26 tpi, or 20 tpi ("CEI20")īSP,G,R: British Standard Pipe, like Whitworth but for pipe diameters, dia for inner pipe dia! TABLE OF DIMENSIONS, STANDARDS AND EXAMPLES M11x1.Conference for unification report, vol.73, small screws: ![]() BA HSS Taps Right Hand BSB HSS Taps British Standard Brass Right Hand BSCY HSS Taps British Cycle Right Hand BSF HSS Taps Right Hand BSP Double Ended DS Taps BSP HSS Taps Right Hand BSP Nut Taps Long Series BSP Volkel HSS Taps Right Hand BSPT HSS Taps Right Hand BSW Whitworth HSS Taps Right Hand Combination Drill Tap Metric & BSW HSS-Co DIN 371 & 376 Taps ME HSS Taps Model Engineers Right Hand Metric Coarse Double Ended DS Taps Metric Coarse Taps HSS-G Volkel METRIC Coarse, Fine, Specials HSS Taps R/H Metric Colour Ring Taps Metric Fine Double Ended DS Taps Metric Fine Taps HSS-G Volkel Metric Flutless Roll Taps Volkel Metric Hexagon 1/4 Shank Taps Metric Oversize HSS Thread Taps Right Hand Metric Spiral Flute Taps Volkel Metric Tap & Tapping Drill Sets Metric Taps HSS-Co Metric Taps HSSe (M35) Right Hand Metric Taps Long Series Nut Taps NPS HSS Taps Right Hand NPSF HSS Taps Right Hand NPT HSS Taps Right Hand NPTF Dryseal HSS Taps Right Hand P.G HSS Taps Electrical Conduit Right Hand RP HSS Taps Right Hand Special Order HSS Taps Tap Drill Sets Tap Wrench & Ratcheting Tap Wrench's Trapezoidal Metric HSS Taps Right & Left Hand UN 8 & 12 TPI Taps Volkel UNC - UNF - BSP Colour Ring Taps UNC / UNF Nut Taps Long Series UNC HSS Taps Right Hand UNEF HSS Taps Right Hand UNF HSS Taps Right Hand UNF Taps Volkel UNJF HSS Thread Taps UNS HSS Taps Right Hand DIES - DIE NUTS HSS Right Hand Threading Tools Left Hand TAPS & DIES HSS Threading Tools TAP and DIE SETS HSS Threading Tools Taps and Dies Carbon Steel DRILLS, Centre Drills, Step Drill, C/Sink HELICAL -V Coil Wire Inserts - Taps - Gauges THREAD GAUGES Screw Plug, Ring, Caliper Plain Plug Gauges Go / No-Go Plain Ring Gauges SLIP GAUGE'S AND SET'S Measuring Equipment Coventry Die Heads, Chasers Axial Thread Rolling
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