Page 16 - LFC catalogue Metrology

metrology

Internal - External Inspection

Limit Gau ges f or Para llel Screw T hrea ds

Made in Japan since 1966, OJIYA SEIKI is comitted towards devising comprehensive precision gauging instrument which are durable and reliably practical.
According to JIS, outside diameter of the male screws are basically measured using plain ring gauge or snap gauge and inside diameter of female screws
are measured using plain plug gauge.
Ojiyas’ screw threads have two classes of class A and class B. In conventional JIS, it is classied into inspection and production use. In ISO based JIS, there is
no such classication. However, class A and class B are common for GO sides (plug/ring) of gauges only. The limit gauges for screw threads are provided in
the same class with the spec of screw thread products and consist of GO and NOT GO size as one pair.

ISO ಋೖJIS ن֨ ैདྷJIS ن֨
ISO-based JIS Standard C Con l l JJIJI S SS S ttanddarddJJ
Conventional JIS Standardventitionnal J

Limit Gau ges f or Para llel Pipe Thread s Para llel Pipe Thread s

Ojiyas Parallel Pipe Threads (G) specied in JIS are used to connect Ojiyas Parallel Pipe Threads (PF) specied in JIS are used to connect
uid equipments, plumbing parts, pipes where density resistance is uid equipments, plumbing parts, pipes where density resistance is
unnecessary in their mechanical connection. unnecessary in their mechanical connection.
Limit gauges for parallel pipe threads (G) are used for inspecting the Limit gauges for parallel pipe thread (PF) are used for inspecting the
dimension of such threads. dimension of such the threads.

(G) ISO-based JIS (PF) ISO-based JIS Thread Plug Gauge

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