WE SPECIALIZE IN EXTERNAL & INTERNAL SCREW THREAD MEASUREMENT
d2, D2
,
d1 & D

To see how FMS measures threads :
 https://www.youtube.com/watch?v=rKqp0o2nK54
 

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EXTERNAL
d MAJOR DIAMETER
d2 PITCH DIAMETER
d1 MINOR DIAMETER

INTERNAL
D MAJOR DIAMETER
 D2 PITCH DIAMETER
D1 MINOR DIAMETER

P PITCH
α FLANK ANGLE

 

MAJOR DIAMETER d/D
Aussendurchmesser
Diamétre extérieur
Yderdiameter

PITCH DIAMETER d2/D2
Flankendurchmesser
Diamétre sur flancs
Delediameter

MINOR DIAMETER d1/D1
Kerndurchmesser
Diamétre intérieur
Inderdiameter

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.
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FMS thread inserts can also be made to measure d1 & D
 on virtually all threads types, diameters and pitches.

Minimum internal thread is 6mm / 1/4"
and finest pitch is 0.5mm / 48 TPI.
     
Thread pitch diameter measurement measuring

external internal screw thread pitch diameter measurement measure OD ID od id
Flankendurchmesser Diamétre sur flancs Delediameter