Advertisement
JCM Quality Fitting Equipped With 18-8 Stainless Steel Bolts and Nuts
When not properly handled it is the nature of stainless steel fasteners to gall and freeze (seize up). This is due to the
inherent properties of the stainless material. Galling and freezing is often triggered by the presence of metal chips, burrs
and grains of sand on the threads of the bolts and nuts. Extra care has been taken by JCM prior to assembly and packing
of this fitting to assure a trouble-free installation.
1. The nuts and bolts are made from material of different hardness so that they have different strengths.
2. Standard 5/8" and 3/4" nuts are coated with a special blue or green (antiseize) coating. Additional lubricant may be
needed. Uncoated stainless steel hardware is provided without lubrication to prevent a build up of dirt, sand or grit
during shipment. A Molybdenum-Base lubricant is recommended.
3. Each nut is assembled by hand to be sure that it went on the bolt freely.
4. The bolts and nuts are handled carefully to avoid damage to the threads.
5. The bolts and nuts are made to exacting specifications to assure that the correct material is used and that the thread
form is correct.
Stainless hardware is especially susceptible to galling. JCM supplies specially coated nuts to eliminate the galling caused
by over torquing, but the bolt threads must be kept clean, free from nicks and not pitched or thrown into the tool
bucket during the installation process. Use of the JCM 901 Master Wrench or JCM 905 Torque Wrench with Deep
Socket is highly recommended. Use of pneumatic wrench for installation could cause hardware to seize and is not
recommended.
Years of field experience, special applications and product testing have revealed many subtleties regarding
application and installation of bolted fittings. For maximum performance under adverse conditions take
advantage of the JCM "Tricks of the Trade."
1. Difficult to reach or cramped areas on the backside or underside of the pipe can be visually checked by using a
mirror.
2. Couplings perform at optimal effectiveness when centered over joint area.
3. To ease installation gaskets and pipe should be lubricated with water or soapy-water mixture. DO NOT use pipe
lubricant or grease based products to lubricate. Lubricant does not dissipate with water and will not let the gasket
adhere to the pipe.
4. While inspecting pipe ends, assess the condition of the pipe wall. Weakened or deteriorated pipe conditions should
be analyzed and allowed for during the installation and bolt tightening process.
5. Lubricating coupling bolts will ease installation and assure proper torquing of bolts. During the bolt tightening
procedure, tighten bolts in a star pattern, evenly compressing the gasket into the middle ring. Inspect for gasket
misalignment or "cocked" position in the middle ring.
Stainless Steel Fastener Management
and
Tips and Tricks Of The Trade
For a Successful Installation
INTSSB - 0415
Advertisement
