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www.callapg.com 713-675-5271 FAX 713-675-2730
1-800-888-5223 FAX 1-800-444-3252
Like fastener seals, thread seals are one-piece molded-in-place seals
with the rubber sealing element mechanically locked to the metal
retainer. They are designed to seal beneath the nut of the fastener and seal directly against the threads
of the fastener. This design allows thread seals to block the spiral passage created by the threads that
might permit the fluid to wind its way through the helix. When the thread seal is compressed between
the nut and the mating surface, the squeeze on the crown causes the inside of the seal to bulge inward
and hug the crest of the thread. This blocks the axial outside leak path. The thread seal also has three
wedge-shaped protrusions inside the cylinder hole. Since all standard screw threads have only a
singleV-shaped spiral channel, one of these wedges will always be in a position to block the flow of
fluid through this channel.
Thread seals are self-centering and non-directional. Their low cost can provide considerable savings
because they make possible the use of low cost standard fasteners and full threaded fittings. No
special tools or skills are needed for assembly.
The 7500-Series thread seals at APG are 70 durometer nitrile and commercial CAD plated steel, or
70 durometer fluoroelastomer and commercial CAD plated steel. They are available in standard sizes
for bolts and screws as listed below.
Size
Dash
Part Number
Metal Metal
Number Nitrile Fluoroelastomer O.D. Thickness
–6 * * .406 .051
–8 * * .406 .051
–10 ATS7500-10 * .469 .051
–1/
4 ATS7500-1/4 * .562 .051
–5/
16 ATS7500-5/16 * .687 .064
–3/
8 ATS7500-3/8 ATS7500-3/8VT .750 .064
–7/
16 * * .906 .078
–1/
2 ATS7500-1/2 * 1.000 .078
–9/
16 * * 1.094 .094
–5/
8 ATS7500-5/8 ATS7500-5/8VT 1.187 .094
–3/
4 ATS7500-3/4 * 1.375 .109
–7/
8 ATS7500-7/8 * 1.562 .109
–1 ATS7500-1 * 1.750 .120
Thread Seals
* Not currently anAPG stock item. Call for availability.