Name: MBF2110-12-350
Brand: Monogram

MBF2110-12-350 decoded
Family	Composi-Lok II (Monogram)
Head style	Low profile protruding head (source: Monogram drawing MBF2110 Rev AB, title block, Tables I, III, IV, material notes)
Nominal diameter	3/8" (-12)
Grip	max grip .350" (grip range .300-.350", MBF2110 Rev AB grip table)
Material	Titanium. Nut: 6Al-4V titanium alloy; screw: A286 CRES; sleeve: 304 CRES

Decoded from the published numbering scheme; not a claim that this exact dash number is a stocked SKU.

Reference only: the controlling drawing, its process spec and the manufacturer's installation instructions govern. How to use these answers

Dimensions

Dimensions as printed, inches
A	Head diameter	.760/.740
D	Nut shank diameter	.3745/.3725
G	Max grip + G: datum to the end of the nut shank	.080(ref)
H	Head height	.125/.118
L	Max grip + L: datum to the end of the screw	1.090(ref)
Recom. Hole	Drilled hole	.378/.375

All dimensions (19)

E	SLEEVE and SCREW head diameter (2X)	.3740max
F	SCREW wrench flats, on the tail	.185/.180
R	NUT head-to-shank radius	.040max
T	DRIVE NUT hex across flats	.500(ref)
Z	Height of the cylindrical head edge	.045max
Min Avail. Grip	Min available grip dash	-150
J	Installed blind head diameter	.575min
K	Installed: blind side protrusion	.625max
Break-Off	Screw break-off, measured from the skin surface	+.103/-.000⑤
Tensile	Tensile structural failure, min (lbs)	5000min, lbs
Double Shear	Double shear, min (lbs)	16450min, lbs
Locking Torque	Locking torque, min (in-lbs)	4.0min, in-lbs
Grip limits	Dash 12-350	.300-.350

As printed on MBF2110 Rev AB sheet 1 ↗. Letters match the drawing.

Some features are scaled from the figure, not dimensioned.Scaled features

Scaled from the drawing's figure (not drawing dimensions)

Component / feature	Scaled as	Model (in)
NUTnut nose diameter at its end (diameter)	0.768 x D	.2868
NUTnut nose end, from the datum	0.162 x L - G	-.5936
NUTnut bore = screw thread crest diameter (diameter)	0.713 x D	.2663
SCREWscrew thread crest diameter (threads not modelled)	0.713 x D	.2663
SLEEVEsleeve bore over the nut nose and the insert (diameter)	0.839 x D	.3133
SLEEVEsleeve bore beyond the insert (diameter)	0.729 x D	.2723
INSERTinsert outside diameter (= sleeve bore)	0.839 x D	.3133
INSERTinsert inside diameter (= sleeve bore beyond the insert)	0.729 x D	.2723
INSERTinsert end, from the datum	0.368 x L - G	-.8013
SLEEVEcrimp line (start of the crimped band), from the datum	0.724 x L - G	-1.1609
SCREWscrew head top (sleeve end), from the datum	0.826 x L - G	-1.2647
SCREWscrew head corner radius	0.062 x E	.0231
SLEEVEsleeve top, from the datum (where the scaled nose meets the scaled sleeve bore)	0.112 x L - G	-.5436
NUTnut nose taper (included angle)	angle, as drawn	29.7°
DRIVE NUTdrive nut length	1.064 x T	.5322
DRIVE NUTdrive nut bearing diameter (cone end on the head)	0.684 x T	.3422
DRIVE NUTdrive nut bearing cone (half angle from the axis)	angle, as drawn	30.6°
SCREWscrew tail beyond the drive nut	1.073 x T	.5367
SCREWwrench flats run: tail end to the drive nut (as drawn)	as drawn	.5367
NUThead chamfer above the Z edge (angle from the axis)	angle, as drawn	44.5°

Measured on MBF2110 Rev AB sheet 1 figure at 300 dpi and kept as a ratio to a dimension this part number prints. Figure scale 591.5 px/in, fitting row -8, taken from A and E; checked against D (+1.4%), T (+1.4%), F (+3.4%), L - G (+2.0%).

Also printed in MBF2110 Rev AB for this part

Recommended hole	.375-.378 in (MBF2110 Rev AB sheet 1)
Installed blind head	J .575 in min diameter (MBF2110 Rev AB sheet 1)
Installed protrusion	K .625 in max (TYPICAL INSTALLATION) (MBF2110 Rev AB sheet 1)
Break-off limits	+.103 -.000 in, measured from the skin surface (MBF2110 Rev AB sheet 1)
Tensile	5000 lbs min (structural failure) (MBF2110 Rev AB sheet 1)
Double shear	16450 lbs min (MBF2110 Rev AB sheet 1)
Locking torque	4.0 in-lbs min (MBF2110 Rev AB sheet 1)
Min available grip	dash -150 (MBF2110 Rev AB sheet 1)
Material and heat treat	NUT: 6Al-4V TITANIUM ALLOY PER AMS-T-9047 STA OR AMS4928 OR AMS4967 HEAT TREATED PER AMS-H-81200 TO 95 KSI SHEAR STRENGTH MINIMUM. MAXIMUM HYDROGEN CONTENT 125 PPM. SCREW: A286 CRES PER AMS5731, AMS5732 OR AMS5737 HEAT TREATED TO 175 KSI TENSILE MINIMUM. SLEEVE: 304 CRES PER AMS5639, FULLY ANNEALED. INSERT: ACETAL PER ASTM-D6778 DRIVE NUT: MILD STEEL (MBF2110 Rev AB material and finish notes)
Finish	( - ) NUT: KAL-GARD ANN-RO #1012 CONVERSION COATING OR PHOSPHATE FLOURIDE PER MONOGRAM SPECIFICATION PS741, MAY BE USED AT MANUFACTURER'S OPTION. SLEEVE AND SCREW: PASSIVATE PER AMS2700, KAL-GARD ANN-RO #1013 CONVERSION COATING OPTIONAL. INSERT: NONE DRIVE NUT: COLOR GRAY (MBF2110 Rev AB material and finish notes)
Lubricant	SOLID FILM LUBRICANT PER AS5272 TYPE I OR TYPE II. PARAFFIN WAX, OR CETYL ALCOHOL PER AS87132 (AS REQUIRED FOR PERFORMANCE). (SEE FINISH CODE FOR ADDITIONAL RESTRICTIONS). (MBF2110 Rev AB material and finish notes)

Series and 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) ↗

Section from Monogram drawing MBF2110 Rev AB ↗ sheet 1.Drawing notes

Section drawn from the printed values in Monogram drawing MBF2110 Rev AB sheet 1 (blind fastener, low profile protruding head). Letters are the drawing's. Manufacturer nominal: printed values, the mean where only two limits are printed. Head drawn as its A x H envelope: the drawing dimensions the head edge (Z max) but not the chamfer above it. Section through the axis: NUT, SCREW, SLEEVE, INSERT and DRIVE NUT as the drawing names them, each hatched on its own. Max grip .350 plus G .080 and L 1.090. The drive nut is cut through its hex corners, as the figure draws it; T is across the flats (dashed). Features the drawing shows without a dimension (nut nose, sleeve start and bores, insert, screw thread, screw head length and corner, crimp line, drive nut length and cone, tail length) are scaled from MBF2110 Rev AB sheet 1 figure and are not drawing dimensions; the INSERT is all scaled (dashed outline). Threads not modelled.

Model: Monogram drawing MBF2110 Rev AB

Envelope model, not manufacturer CAD.Model details

MBF2110-12-350, manufacturer nominal. Simplified component model from Monogram drawing MBF2110 Rev AB sheet 1. Manufacturer nominal: printed values, the mean where only two limits are printed. Flush heads hold the printed head angle; the head depth is derived. Not manufacturer CAD. Verify against the current drawing before use. One named solid per component as the drawing calls them out (NUT, SCREW, SLEEVE, INSERT and, where the drawing has one, DRIVE NUT). Features the drawing shows without a dimension are scaled from its figure and listed as scaled in the STEP header; threads are not modelled. The STEP file is an assembly: each component is its own named part with its own colour. STL comes as the whole part or one component at a time. Axis +Z, head up, z = 0 at the face the head bears on. STEP (AP214) is in inches; STL has no units and is written in millimetres.

Other head styles, same diameter and grip

MBF2111-12-350 reduced protruding hex head
MBF2112-12-350 100° flush head
MBF2113-12-350 130° flush head

MBF2110 grip chart: 3/8" (-12)

32 grips

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

Other diameters at this grip:

MBF2110-5-350 MBF2110-5.5-350 MBF2110-6-350 MBF2110-6.5-350 MBF2110-7-350 MBF2110-8-350 MBF2110-8.5-350 MBF2110-9-350 MBF2110-10-350 MBF2110-11-350

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. — 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.

Required tooling, every brand

Tool catalogs, cited

MBF2110-12-350 (Composi-Lok II, 3/8") installs with MP550BFDN-12AA (MP550BF with MPP-12 + MPTBF-12) Standard.

MP550BFDN-12AAMP550BFMPP-12Monogram MBF2003 Rev AG p.4 ↗

Composi-Lok II tool tables

Other tools that work2 process-doc listings

As the fastener's own process document lists them

MH75DN-12AA (MH75 with MHPDN-03 + MH-12) Standard Monogram MBF2003 Rev AG p.9 ↗
MHC75DN-12AA (MHC75B with MHCPDN-03 + MHC-12) Close quarter Monogram MBF2003 Rev AG p.10 ↗

Sources3

Monogram MBF2003 Rev AG (Composi-Lok II install spec), p.4, Table 1 ↗
- Wrench adapter (turns screw) MPTBF-12; nose adapter (holds nut) MPP-12. A / B / C Ref. 1.48 / 1.36 / 0.75.
Monogram MBF2003 Rev AG (Composi-Lok II install spec), p.9, Table 6 ↗
- Wrench adapter MH-12; nose adapter MHPDN-03. A / B Ref. 1.82 / .75.
Monogram MBF2003 Rev AG (Composi-Lok II install spec), p.10, Table 7 ↗
- Wrench adapter MHC-12; nose adapter MHCPDN-03.

Diameter -12 (3/8"): decoded from the part number.

Tool catalogs are the manufacturers' as published in the cited edition; confirm current PNs with the tool maker before purchase. Install per the OEM process specification.

Install tooling

Install tooling: MP550BFDN-12AA (Monogram MBF2003 Rev AG (Composi-Lok II install spec), p.4, Table 1) · proprietary

MGPCL Protruding head leaf gage (break-off check)
RM3118-12 Removal nose piece module, flush head style

Composi-Lok II tool tables · Open in the tooling finder

Decode details

Decode details
Series	Composi-Lok II
Decode confidence	high
Numbering source	Monogram drawing MBF2110 Rev AB, title block, Tables I, III, IV, material 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).

Government reference cross-reference (DLA FLIS)

not listed under this PN

MBF2110-12-350 is not listed in FLIS under this exact part number (FLIS data as of 2025-03-18, March 2025 snapshot). FLIS may record it with a material or finish code, or under the standard part number.

Source: DLA PUB LOG ↗. Search any part number in the decoder.

Cross-reference MBF2110-12-350

Composi-Lok II by Monogram, blind bolt
Datasheet (PDF) ↗
Manufacturer page ↗
Numbering: Monogram drawing MBF2110 Rev AB, title block, Tables I, III, IV, material notes ↗
Geometry: MBF2110 Rev AB ↗

Lead-time risk for this family (SpecLok sourcing assessment): High

Supply signal

not in FLIS by this PN; no SpecLok quotes yet

Supply signalfor this part number

Not listed in FLIS under this exact part number (March 2025 snapshot).
No SpecLok quotes yet.

A signal from records SpecLok holds, not availability, stock or a lead-time promise. FLIS lists who has recorded a part number for the item, not who makes it today. DoD awards carry no NSN or part number, so award activity is for the item name's class.

Sources: DLA FLIS Data Electronic Reading Room (PUB LOG) ↗, DLA PUB LOG ↗, USAspending.gov award search API ↗; DoD award data 2025-10-01 to 2026-07-06; compiled 2026-10-02.