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MLS UNIMATIC® Blind Rivets (NAS1900 Series) :
Technical Information :
Identification and Installation Inspection
Identification and Installation Inspection
Huck MLS/NAS1900 Blind Rivets carry the following identification head markings
Special "H" as manufacturers identification symbol.
Material Code Letters:
No letter indicates Aluminum.
"C" indicates A286 CRES.
"M" indicates Monel.
Grip identification number:
Grip Range = nominal grip +.000/ -.063"
Example: -04 grip ranges.250" to .187"
Stem Protrusion Limits
| Rivet Diameter
| "A" Dimension Aluminum
Rivets Only | "A" Dimension
Monel & A286 Rivets | | 1/8 (04) | +.018 -.008 | +.010 -.005 | | 5/32 (05) | +.022 -.010 | +.010 -.005 | | 3/16 (06) | +.025 -.012 | +.010 -.005 | | 1/4 (08) | +.032 -.016 | +.015 -.005 |
Inspection for proper installation of UNIMATIC® blind rivets is made from the visible side. If the stem position is within limits shown the fastener will meet mechanical performance minimums.
Lock Collar Installation Requirements The driven lock collar must be flush or below the spindle land, providing the spindle position meets the limits of "A" dimension shown above.
The correct installation of UNIMATIC® blind rivets require that instructions regarding hole preparation, tools, and installation technique be carefully followed.
It is imperative that the nose assembly and jaws be clean, free from chips, burrs and sealant, and are in proper mechanical repair.
When problems occur, the source could be the installer, the tools, or the application. The following guide may assist if installations are faulty.
Rivet Stem breaks high
If rivet stem exceeds the maximum protrusion limit than the cause could be:
1. Oversize hole: Hole preparation was beyond the tolerance specified for the rivet installed.
2. Rivet to long for material stack up, Grip should be measured and proper length fastener selected for installation.
Rivet Stem breaks low.
If rivet stem breaks well below the maximum allowed dimension below the rivet head the cause could be:
1. Rivet installed in undersize hole. Check hole diameter to be sure the hole is within specified limits.
2. Rivet installed in over maximum grip. Grip should be measure and proper length fastener selected for installation.
3. Rivet installed in misaligned holes. Care should be taken to insure material is clamped together during drilling to prevent movement and misalignment.
4. Installer cocked tool during installation. Installer should take care to see that tool is properly aligned and rivet is fully seated into work before installation.
Head not seated
Probable cause for improperly seated rivet heads:
Hole slanted or misaligned.
1. Installer cocked tool and nose assembly during installation. If available use a drill guide to insure hole is perpendicular to work surface.
2. Bad countersink on flush head fasteners. Be sure drill and countersink cutter are proper size and angle. Also be sure there is no drill run out or wobble.
3. Head extrusion from too small a hole. If hole is below specified limits the fastener could extrude during lock formation to cause head rise.
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