LONG-LOK®
Long-Lok® Strip Type
-320°F to +500°F
Reusability per IFI 124, IFI 524 and MIL-DTL-18240
The Long-Lok® strip fastener is a universally accepted, prevailing torque type self-locking fastener, with excellent vibration resistance. Over 35 years of use in thousands of proven applications attest to the wide acceptance of the Long-Lok strip. These fasteners are available in a wide range of sizes — from miniature eyeglass screws to fasteners for the heaviest of highway equipment.
Long-Lok strip fasteners are manufactured by forming a narrow longitudinal slot long enough to assure engagement with the female thread in an otherwise normal bolt or screw, and compressing a special locking material in the slot. The resiliency of the locking insert holds it in place without adhesives or thread distortion, allows it to recover slightly when disengaged, and provides vibration resistance on re-installation. This prevailing torque characteristic can provide re-usability performance in excess of 5 installation/removal cycles.
Several insert materials are available for operating temperatures ranging from -400°F to +500°F. Long-Lok also offers a specially designed stainless steel, rolled-tube insert for temperature requirements in excess of 1200°F.
Military Specifications:
MIL-DTL-18240, QPL-18240
Military Standards:
MS15981, MS16995-16998, MS18063-18068, MS18153, MS18154, MS21090-21099, MS21262, MS21295, MS51021, MS51023, MS51029, MS51031, MS51095, MS51096, MS90727, MS90728
Aerospace Standards:
NAS662, NAS1081, NAS1161-1168, NAS1171-1178, NAS1181-1188, NAS1189, NAS1190, NAS1191, NAS1223-1235, NAS1283, NAS1351, NAS1352, NAS1635 NAS4104-4116, NAS4204-4216, NAS4304- 4316, NAS4400-4416, NAS4500-4516, NAS4600-4616, NAS5000-5006, NAS5100-5106, NAS5200-5206, NAS5300-5306, NAS5400-5406, NAS5500-5506, NAS5600-5606, NAS5700-5706, NAS5800-5806, NAS6203-6220, NAS6303-6320, NAS6403-6420, NAS6500-6506, NAS6603-6620, NAS6704-6720, NAS6804-6820, NAS6900-6906
Commercial Standard:
IFI 124, IFI 524 (Metric)
| Materials | Color Code | Operating Temperature Range | Material Specification |
|---|---|---|---|
| Polycap Nylon | Green | -60°F to +250°F; -51°C to +121°C | ASTM-D-4066 |
| PCTFE (Kel-F®*) | Blue | -320°F to +390°F; -196°C to + 199°C | AMS 3650 |
| Vespel® | Brown | -450°F to +500°F; -268°C to + 260°C | n/a |
| Hot-Lok™*(Stainless Steel Tube) | Silver | -400°F to +1200°F; -240°C to + 649°C | n/a |
| Thread Size | #0 | #1 | #2 | #3 | #4 | #6 | #8 | #10 | 1/4 |
|---|---|---|---|---|---|---|---|---|---|
| "L" Insert Length | .125 | .125 | .185 | .185 | .240 | .285 | .320 | .320 | .355 |
| Thread Size | 5/16 | 3/8 | 7/16 | 1/2 | 9/16 | 5/8 | 3/4 | 7/8 | 1 |
| "L" Insert Length | .420 | .480 | .530 | .562 | .562 | .625 | .750 | .750 | .750 |