Technical Booklet

T HREAD P LUG G AGES

A Thread Plug “GO” gage checks the minimum major diameter and the minimum pitch diameter size in a part, the “NOGO” checks for the hole not to exceed the maximum pitch diameter size in a part. All GSG Thread Plug Gages are manufactured to ASME/ANSI B1.2 or B1.16M. All gages are made of oil hardened Tool Steel.

REVERSIBLE THREAD PLUGS

TRILOCK THREAD PLUGS

• Reversible style thread work plug gages are avail- able up to and including ¾” (19.05mm). • Gages can be reversed end for end in the handle resulting in double the wear life. • Each end of the handle is color coded, green for Go and red for Nogo. • Chip Grooves are provided on both ends of the Go work plug member #10/M4 and Larger.

• Trilock style Thread Work Plugs are available for ¾” (19.05mm) and larger. • Gage can be reversed on the handle resulting in a longer wear life. • Shown is a single end on a handle which reduces weight with large sizes.

TAPERLOCK THREAD PLUGS

TAPERLOCK SET PLUG

• Taperlock style Thread Work Plug gages are available up to and including 1 ½” (38.1mm) • Taperlocks are the most popular style in thread plug gaging .

• Shown is a Go and Nogo Truncated (Master) Set Plug. • Set Plugs are used to set thread rings for proper fit and feel and inspect ring for wear. • Set Plugs have a common pitch diameter the full thread length of the Go or Nogo section. The crest of the thread is truncated for the first half of the set plug and “full form” the remaining length.

HELICAL COIL PLUG GAGES (STI)

• Helical Coil plug gages are used to inspect the hole prior to inserting a screw thread insert when repairing a HOLE LOCATION PLUGS

Fixed

Off lead Motion

• GSG Manufactures hole location gages in two types. When checking the location of a small tapped hole the flex plug is used. • When inspecting a larger hole (generally over 1.00” ) then the lead lock is used. Both gages locate on the flank angles of the tapped hole. • Lead locks can be used in conjunction with the zero spindle and are a perfect way to inspect features for run-out to the pitch diameter of the thread. • Special designs are available such as true position of threads to bore diameters with dial or digital indicators

FLEX PLUG

LEAD LOCK

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