Reading PLT110-05-05
Where to buyPLT110 is the 100° flush head, PLT210 the protruding hex head; PLT111 and PLT211 are the same bolts for a hole 1/64 in larger. Then come the diameter dash (-05 to -12) and the grip dash in sixteenths of an inch. Example from the data sheet: PLT110-05-05 is diameter code -05 (nominal body diameter .1635 in) and grip dash -05 (nominal grip 5/16 in; usable range .282 to .344 in).
Half grips are ordered by adding .5 to the grip dash (for example -06-4.5); grips shorter or longer than the tabulated ones may exist as specials, and on shorter grips the break-off limits and the prevailing torque of the table do not apply (PLT110 Rev. P, notes).
Material: Nut and screw: alloy steel (4130 per AMS-S-6758, 4140 per AMS 6382 or AMS 6349, or 8740 per AMS 6322), heat treated per AMS 2759 to roughly 180,000-200,000 psi tensile (HRC 39-43). Sleeve: corrosion-resistant steel 303 or 304 (AMS-QQ-S-763, AMS 5639 or AMS 5641). (PLT110 Rev. P, Monogram Aerospace Fasteners). Howmet describes the Visu-Lok as designed specifically for use in metallic structures and forming a solid blind-side head.
Standard and 1/64 in oversize hole, with the drill
| Dash | Body, in | Hole, in | Drill | Oversize body, in | Oversize hole, in | Oversize drill |
|---|---|---|---|---|---|---|
| -05 | .1635 | 0.165–0.168 | #19 | .179 | 0.180–0.183 | #14 |
| -06 | .1980 | 0.199–0.202 | #7 | .214 | 0.215–0.218 | no standard drill inside: ream |
| -08 | .2590 | 0.260–0.263 | G | .275 | 0.276–0.279 | J |
| -10 | .3105 | 0.312–0.315 | 5/16 | .326 | 0.327–0.330 | 21/64 |
| -12 | .3735 | 0.375–0.378 | V | .389 | 0.390–0.393 | 25/64 |
Hole limits from the PLT110 Rev. P and PLT111 Rev. R data sheets (hole min to max); the drill is the final drill of the Fastener hole drill table, or the drill inside the range where the table has none. Reaming may be needed to hold the limits.
Grip dash, diameter -05
| Grip dash | Grip min, in | Grip max, in |
|---|---|---|
| 02 | .094 | .156 |
| 03 | .157 | .219 |
| 04 | .220 | .281 |
| 05 | .282 | .344 |
| 06 | .345 | .406 |
| 07 | .407 | .469 |
| 08 | .470 | .531 |
| 09 | .532 | .594 |
| 10 | .595 | .656 |
| 11 | .657 | .719 |
| 12 | .720 | .781 |
| 13 | .782 | .844 |
PLT110-05 rows. The grip ranges differ slightly by diameter and the tolerance on G is +.030/−.010 in for -05 and -06, +.040/−.010 in for -08 and -10 (PLT110 Rev. P): use the data sheet of the part.
Installing a Visu-Lok
| Step | What | Source |
|---|---|---|
| 1 · Hole | Drill to the limits of the table; gauge; ream if needed | PLT110 / PLT111 data sheets |
| 2 · Grip | Measure the stack with the grip gauge for the type; the grip is critical | FAA-H-8083-31B p. 4-54 |
| 3 · Insert | Bolt in the hole, tool over the screw and the nut | p. 4-54 |
| 4 · Drive | Hold the nut, turn the screw: the sleeve is drawn up over the tapered nose of the nut and forms tight against the blind side | p. 4-55 |
| 5 · Break | The screw breaks in its groove; the stem of Visu-Lok does not break off flush | p. 4-55 |
| 6 · Shave | Use the screw break-off shaver tool where a flush finish is required | p. 4-55 |
The bolt has left-hand threads; the Visu-Lok is one of the drive-nut blind bolts the FAA handbook groups with Jo-Bolt, Composi-Lok, OSI Bolt and Radial-Lok. Blind bolts are difficult to remove because of the hardness of the core bolt; the makers sell a removal kit for each type (p. 4-52).
Equivalents
| Visu-Lok | Same stock number as | Where |
|---|---|---|
| PLT210 | NAS1669 (protruding hex) | Jo-Bolt guide, federal pairs |
| PLT110 | NAS1670 (100° flush) | Jo-Bolt guide |
| PLT111 | NAS1750 | Jo-Bolt guide; title not confirmed |
| PLT211 | NAS1751 | Jo-Bolt guide; title not confirmed |
| ASNA0081 / ASNA0082 | Visu-Lok / Jo-Lok type | ASNA data sheets |
Pairs are the same stock number in federal item records, as set out in the Jo-Bolt guide.
Questions people actually ask
What does the -05 in PLT110-05-05 mean?
The first dash is the diameter code (-05 is a nominal body diameter of .1635 in) and the second is the grip dash in sixteenths of an inch.
When do I need PLT111?
When the hole is already 1/64 in oversize; PLT111 is the 1/64 in oversize version of PLT110 (and PLT211 of PLT210).
Why is the stem left sticking out?
The Visu-Lok stem does not break flush: shave it with the break-off shaver where flush is needed.
Limits of this guide
What the sources support, and no further.
- Strength values are on the data sheets and in MIL-HDBK-5J, not repeated here.
- L and DL letters of the NAS cross numbers are explained in the Jo-Bolt guide.
- Tooling part numbers are the maker's.
- Reference data, not approved data. The SRM, the drawing or the approved repair data governs over every figure here.
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Sources
- PLT110 Rev. P, PLT111 Rev. R, PLT210 Rev. L, PLT211 Rev. P (Monogram Aerospace Fasteners) — Diameter and grip dashes, hole limits, material and notes.
- FAA-H-8083-31B, Aviation Maintenance Technician Handbook, Airframe, chapter 4 — Pp. 4-52, 4-54, 4-55: blind bolts, drive-nut installation.
- Howmet blind bolts — Visu-Lok description.