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Composi-Lok II tooling, gauges and removal

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By diameter

Dia.Published tool + noseOther accessGauges
-5MP550BFDN-5AA (MP550BF + MPPBF-08 + MPBF-05)Right angle, Close quarterBFS-1A, MGFCL-5, MGPCL, MHTFDN-5
-6MP550BFDN-6AA (MP550BF + MPPBF-08 + MPBF-06)Right angle, Close quarterBFS-1A, MGFCL-6, MGPCL, MHTFDN-6
-8MP550BFP-8AA (MP550BF + MPPBF-08 + MPBF-08)Right angle, Close quarterBFS-1A, MGFCL-8, MGPCL, MHTFDN-8
-10MP550BFDN-10AA (MP550BF + MPP-12 + MPTBF-10)Close quarterBFS-1A, MGFCL-10, MGPCL, MHTFDN-10
-12MP550BFDN-12AA (MP550BF + MPP-12 + MPTBF-12)Close quarterBFS-1A, MGFCL-12, MGPCL, MHTFDN-12
Tools, heads, adapters and gaugesCited tables

Published tool combinations

Installation tools

Grip, hole and inspection gauges

Fastener close quarter tooling clearance (Figure 8, Table 8)

Nominal diameterMHC 75 A minMHC 75 B minMRC 550 A minMRC 550 B min
5/32.3441.597.3441.696
3/16.3441.658.3441.757
7/32.5002.004.3441.976
1/4.5002.102.3442.074
9/32.5002.385----
5/16.5002.357----
11/32.5002.585----
3/8.5002.610----

"Flush Head Fastener shown. Dimensions are applicable to all head styles." As drawn in Figure 8, A is measured from the fastener centerline to the adjacent wall and B from the part surface to the overhead structure.

Monogram MBF2003 Rev AG (Composi-Lok II install spec), p.11, Figure 8, Table 8 ↗

Tooling source notes

  • MBF2003 §7.5: "In those instances where special driving tools are adopted by the user, wrenching speed of this tooling shall not exceed 600 RPM." §4.3: "It is required that only the approved tools listed in Paragraph 3 of this specification be used for the installation of these fasteners."Specification, not interview: Monogram MBF2003 Rev AG.
  • Alternative tooling works in practice: roughly 500 RPM with the right torque and fittings, and shops fabricate the fittings in house. Check it against the manufacturer's speed limit for user-adopted tools before relying on it.Installer interview (aerospace tool services), 2026-09-25. Field experience, not a specification.
  • Monogram factory tooling was quoted at 23 to 24 weeks lead time. Order tooling with, or before, the first fasteners.Installer interview (aerospace tool services), 2026-09-25. Field experience, not a specification.
  • Repair access is the edge case that bites: you can't strip the surrounding structure during a repair, and some jobs need 90° drills and heads. Know the tool envelope during design.Installer interview (aerospace tool services), 2026-09-25. Field experience, not a specification.
Removal (drill-out)Published procedure

Monogram MBF2003 Rev AG (Composi-Lok II), §8 Removal and Figure 9

  1. “Composi-Lok II may be removed with the tooling shown in Figure 9 of this specification. Complete kits are available from Monogram Aerospace Fasteners. Contact factory for details.” Monogram MBF2003 Rev AG (Composi-Lok II install spec), p.18, §8.1 ↗
  2. “Corebolt protrusion should be milled flush prior to removal.” Monogram MBF2003 Rev AG (Composi-Lok II install spec), p.12, Figure 9, Table 9 ↗
  3. “A complete tool consists of the air motor module (RM3197), a nose piece module (column 3) and a carbide star drill (column 4). A depth gage (column 6) is required for setting drilling depth.” Monogram MBF2003 Rev AG (Composi-Lok II install spec), p.12, Figure 9, Table 9 ↗
  4. “Use flush head style nose piece modules for non-hexagonal protruding head fasteners (e.g. MBF2110 and MBF2120).” Monogram MBF2003 Rev AG (Composi-Lok II install spec), p.12, Figure 9, Table 9 ↗

Cautions

Removal tooling and drill sizes

Nominal diameterNose piece, flushNose piece, protruding hexCarbide star drillDrill size dia. +.0000/.0005Depth gage
-5 (.1635)RM3118-05RM3122-05RM3116-05.1540RM3125-01
-6 (.1975)RM3118-06RM3122-06RM3116-06.1890RM3125-01
-7 (.2265)RM3118-07RM3122-07RM3116-07.2180RM3125-01
-8 (.2585)RM3118-08RM3122-08RM3116-08.2500RM3125-01
-9 (.2885)RM3118-09RM3122-09RM3116-09.2810RM3125-02
-10 (.3105)RM3118-10RM3122-10RM3116-10.3020RM3125-02
-11 (.3425)RM3118-11RM3122-11RM3116-11.3320RM3125-02
-12 (.3735)RM3118-12RM3122-12RM3116-12.3590RM3125-02

Monogram MBF2003 Rev AG (Composi-Lok II install spec), p.12, Figure 9, Table 9 ↗

Also published: Monogram MBF2301 Rev NR (Composi-Lok 3), §8.0

  1. “Composi-Lok 3 may be removed with the tooling shown in Figure 9 of this specification. Complete kits are available from Monogram Aerospace Fasteners. Contact factory for details.” Monogram MBF2301 Rev NR (Composi-Lok 3 install spec), p.18, §8.0 ↗
  2. “Corebolt protrusion should be milled flush prior to removal.” Monogram MBF2301 Rev NR (Composi-Lok 3 install spec), p.12, Figure 9, RK5000 Fastener Removal Kit, note 3 ↗

Cautions

None of the removal procedures on file gives a composite-specific removal caution. The Monogram specs address composite at the hole instead: holes "reasonably round and free from burrs (metallic structure) and delamination (graphite/epoxy type structure)" (MBF2003 §5.1).

Tool tables are the manufacturer's as published in the cited revision; confirm current tool PNs with the manufacturer or distributor before purchase. Not a certified process authority: install and remove per the OEM process specification.

Next · Step 4: Order

Put the tooling on the RFQ

The RFQ package adds these tools and gauges for the diameters on your lines, so the supplier quotes them with the fasteners.