
QUICK, EASY AND AFFORDABLE MEASUREMENT OF EXTERNAL AND INTERNAL
THREAD PITCH DIAMETER – ALSO AT THE MACHINE
Thread Pitch Diameter Measurement
d2 & D2
60º M, MF, UNC, UNF, UNEF, UNS,
55º Whitworth, G, BSP, R, Rc, BSPT, 60º NPS,
NPT, 30º Tr, Rd, 29º ACME, Stub Acme,
80º Pg, Buttress (all types), API, etc.


Video: Thread Pitch Diameter Measurement External & Internal
FMS caliper and thread inserts
Inserts 22B for P 2-4mm 13-6 TPI
Inserts 21B for P 2-4mm 13-6 TPI
D2 Calibration
When asking for information or requesting a quote
the 3 most important facts are:
Thread type
External and/or internal thread
Thread pitch
THREAD INSPECTION OR MEASUREMENT?
By ”inspection” means checking threads with solid gauges and preferably with both Go and No-Go thread plug and ring gauges. This applies in most cases, to smaller diameter standard threads cut with taps or dies. Gauges for smaller standard threads are usually reasonably priced although, if gauges are for non standard threads or to be calibrated regularly, cost increases.
Measuring threads is common sense especially when setting up the machine. Making a mistake in expensive items is costly and certainly cause for concern if it is a customer that finds a fault. When measuring always measure d or D1 and preferably pitch diameter. If the pitch diameter is close to the middle of the tolerance then inspection probably doesn’t need to be as often and with mass production SPC will show how much variation there in fact is within the tolerance by the process. There will almost certainly be much less wear on solid gauges by staying away from tolerance limits.
The major diameter (d) of an external thread must not be less than the minimum of the tolerance and the minor (bore) diameter (D1) of an internal thread must not be more than the maximum of the tolerance. Both these measurements are very easy to do and a stripped (weakened) thread could be a disaster.
Measure internal thread pitch diameter
Measure metric and UN thread pitch diameter
Measure taper thread pitch diameter
Measure taper pipe threads
Measure ACME Tr Trapezoid threads
Digital caliper accessories
Buttress thread measurement inserts
ACME thread measurement inserts
TR Trapezoidal thread measurement inserts
Thread information and pitch diameter tolerances
Thread measuring wires alternative
Thread micrometer alternative
Innengewindesteigungsdurchmesser messen
Messung des Gewindesteigungsdurchmessers
Mesurer le diamètre du pas de filetage interne
Mida el diámetro del paso de la rosca interna
la medida diámetro de paso de rosca
Misurare il diametro primitivo della filettatura interna
Måle indvendig og udvendig gevind delediameter
Cèliáng nèi luówén zhōng jìng
Außen-und Innen Flankendurchmesser messen
Kegelgewinde messen
Mesurer le diamètre du pas de filetage
mesurer les filetages coniques
Medir el diámetro del paso de la rosca
Misurare il diametro del passo del filo
zmierzyć średnicę skoku gwintu
Thread pitch diameter measurement
How to measure internal threads
Digital caliper measurement accuracy