MBF2110-12-550

Composi-Lok II — The composite blind-bolt standard — biggest blind footprint, high clamp-up.

Family	Composi-Lok II (Monogram)
Series	Composi-Lok II
Head style	Protruding
Nominal diameter	3/8" (12/32 nominal)
Max grip	0.550" max
Material	Mixed assembly — typically A286 CRES screw/sleeve + 6Al-4V Ti nut (varies by dash)
Decode confidence	high

Decode notes

Monogram (PennAero) Composi-Lok. Base MBF·G·H: generation digit (0=I, 1=II, 3=Lok 3) and final head digit (0=protruding, 1=hex, 2=100° flush).
Diameter in 1/32"; max grip in thousandths of an inch (0.050" steps).
Suffix letters (finish/material variants) aren't decoded. Shear/tension variants and other head digits (e.g. MBF2119/2120) exist; this reads the common 0/1/2 head digit. No 130° composite head code is confirmed.

Series & strength (datasheet)

MBF21xx · e.g. MBF2112-06-500

75 ksi shear (6-4 Ti screw); double-shear 4,600 lb min — Monogram catalogue.

Datasheet (PDF) →

MBF2110 grip chart — 3/8" (12/32 nominal)

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

MBF2110-12-100 MBF2110-12-150 MBF2110-12-200 MBF2110-12-250 MBF2110-12-300 MBF2110-12-350 MBF2110-12-400 MBF2110-12-450 MBF2110-12-500 MBF2110-12-550 MBF2110-12-600 MBF2110-12-650 MBF2110-12-700 MBF2110-12-750

Other diameters at this grip:

MBF2110-5-550 MBF2110-6-550 MBF2110-8-550

Sourcing

Lead-time risk for this family: High

Need a price or lead time?

Build a spec-complete RFQ and send it to distributors who stock Composi-Lok II.

Composi-Lok II family page →Decode another part number →Not sure this is the right fastener? Use the selector →

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.