MBF2112-12-1050

Composi-Lok II: Monogram Composi-Lok II: "high strength blind bolt for composite and metallic materials" (catalog).

FamilyComposi-Lok II (Monogram)
SeriesComposi-Lok II
Head style100° flush head (source: Drawing MBF2112 Rev AF title block & material notes)
Nominal diameter3/8" (-12)
Gripmax grip 1.050" (grip range 1.000-1.050")
MaterialTitanium. Nut: 6Al-4V titanium alloy; screw: A286 CRES; sleeve: 304 CRES
Decode confidencehigh
Numbering sourceDrawing MBF2112 Rev AF title block & material notes

Decode notes

  • Composi-Lok II grips: "incremental 0.050\" grip lengths" (MBF2003 §2.1); the grip dash is the max grip, e.g. -300 covers .250-.300" (MBF2110/2112/2113 drawings, grip table).
  • Diameter dash per the drawing's basic-dimensions table (e.g. -6 = 3/16").
  • Suffix "A" "designates dual drive nut system for robotic installation" (MBF2112 drawing note 1); MBF2003's installation tooling "not applicable to Composi-Lok II which have an 'A' suffix" (MBF2003 §1.1).

Series & strength (datasheet)

MBF2110 · MBF2111 · MBF2112 · MBF2113 · MBF2120 · MBF2121 · e.g. MBF2112-6-500

Rated shear 75 KSI (catalog comparison chart, MBF2112-06-500); 3/16" (-6) double shear 4,600 lb min, tensile 1,400 lb min, all materials & head styles (MBF2003 Table 10A).

Datasheet (PDF) →

MBF2112 grip chart: 3/8" (-12)

Every catalogued max-grip dash number at this diameter. Stack thickness must fall inside the fastener's grip range: see the design calculators.

MBF2112-12-250MBF2112-12-300MBF2112-12-350MBF2112-12-400MBF2112-12-450MBF2112-12-500MBF2112-12-550MBF2112-12-600MBF2112-12-650MBF2112-12-700MBF2112-12-750MBF2112-12-800MBF2112-12-850MBF2112-12-900MBF2112-12-950MBF2112-12-1000MBF2112-12-1050MBF2112-12-1100MBF2112-12-1150MBF2112-12-1200MBF2112-12-1250MBF2112-12-1300MBF2112-12-1350MBF2112-12-1400MBF2112-12-1450MBF2112-12-1500MBF2112-12-1550MBF2112-12-1600MBF2112-12-1650MBF2112-12-1700

Other diameters at this grip:

MBF2112-5-1050MBF2112-6-1050MBF2112-8-1050MBF2112-10-1050

How Composi-Lok II installs

Threaded / torqued · 4 steps

1/4Inserted

“Insert the fastener in the hole. The Composi-Lok® II can be inserted in a properly prepared hole without interference.”

Monogram MBF2003 Rev AG (Composi-Lok II install spec), p.17, §7.2 ↗

Drawing traced from: Figure 15, left.

Source images (6): patent and government drawings

A patent drawing shows the patented design, which can differ in detail from today's catalog part. Each image says why it is tied to this family.

Exploded view of the fastener.
Exploded view of the fastener.US 4,457,652, Composite buckling blind fastener (Pratt), Fig. 6 ↗ · US patent drawingWhy this family: Monogram's US 10,267,347 states: "the original Composi-Lok fastener is described in U.S. Pat. No. 4,457,652" (John D. Pratt, 1984; later assigned to Monogram). Shows the original Composi-Lok, not the Composi-Lok II drive-nut version.
Axial cross-sectional view of the assembled fastener prior to installation.
Axial cross-sectional view of the assembled fastener prior to installation.US 4,457,652 (Pratt), Fig. 7 ↗ · US patent drawingWhy this family: Monogram's US 10,267,347 states: "the original Composi-Lok fastener is described in U.S. Pat. No. 4,457,652" (John D. Pratt, 1984; later assigned to Monogram). Shows the original Composi-Lok, not the Composi-Lok II drive-nut version.
Fig. 7 prior to installation; Fig. 8 initial portion of the installation process; Fig. 9 intermediate portion; Fig. 10 configuration of the finally installed fastener.
Fig. 7 prior to installation; Fig. 8 initial portion of the installation process; Fig. 9 intermediate portion; Fig. 10 configuration of the finally installed fastener.US 4,457,652 (Pratt), Figs. 7-10 ↗ · US patent drawingWhy this family: Monogram's US 10,267,347 states: "the original Composi-Lok fastener is described in U.S. Pat. No. 4,457,652" (John D. Pratt, 1984; later assigned to Monogram). Shows the original Composi-Lok, not the Composi-Lok II drive-nut version.
The fastener of Fig. 7 in the configuration of the finally installed fastener.
The fastener of Fig. 7 in the configuration of the finally installed fastener.US 4,457,652 (Pratt), Fig. 10 ↗ · US patent drawingWhy this family: Monogram's US 10,267,347 states: "the original Composi-Lok fastener is described in U.S. Pat. No. 4,457,652" (John D. Pratt, 1984; later assigned to Monogram). Shows the original Composi-Lok, not the Composi-Lok II drive-nut version.
Prior art Composi-Lok 3 fastener: nut, bolt, sleeve and drive nut (cross-sectional side view).
Prior art Composi-Lok 3 fastener: nut, bolt, sleeve and drive nut (cross-sectional side view).US 10,267,347, Blind fastener (Monogram Aerospace Fasteners), Fig. 1A ↗ · US patent drawingWhy this family: The patent text: "Referring to FIG. 1A, a prior art Composi-Lok 3 fastener is illustrated as fastener 50." Composi-Lok 3 is the flush-break successor to Composi-Lok II/IIa per the same patent.
The Fig. 1A prior art blind fastener in minimum/maximum installed conditions.
The Fig. 1A prior art blind fastener in minimum/maximum installed conditions.US 10,267,347 (Monogram Aerospace Fasteners), Fig. 1B ↗ · US patent drawingWhy this family: Prior art Composi-Lok 3 per the patent text for Fig. 1A.

Key (how to read these diagrams)

Manufacturer figure: Monogram MBF2003 Rev AG (Composi-Lok II install spec), p.18, Figure 15, Description of Installation ↗Patent US 4,457,652, Figs. 7-10 ↗: Monogram's US 10,267,347 states the original Composi-Lok is described in US 4,457,652. It shows the original Composi-Lok (no drive-nut), not the Composi-Lok II drawn here, so it is linked for the mechanism only.Schematic cross-section at the source figure's proportions, not to scale. Terms are the document's own.

Sourcing

Lead-time risk for this family: High

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Decoded from the published numbering scheme; not a claim that this exact dash number is a stocked SKU, and not a certified design authority. Always verify against the controlling drawing, spec, and your stress group.