Name: MBF2013-11-1550
Brand: Monogram

MBF2013-11-1550 decoded
Family	Composi-Lok II (Monogram)
Head style	130° flush head (source: Monogram drawing MBF2013 Rev AG, title block, dimension and grip tables, material notes)
Nominal diameter	11/32" (-11)
Grip	max grip 1.550" (grip range 1.500-1.550", MBF2013 Rev AG grip table)
Material	Titanium. Nut: 6Al-4V titanium alloy; screw: A286 CRES; sleeve: 304 stainless steel

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.

Dimensions

Dimensions as printed, inches
A	Head diameter, to theoretical projection	.666/.657(ref)
D	Nut shank diameter	.3433/.3418
G	Max grip + G: datum to the end of the nut shank	.075(ref)
H	Head depth (drawn derived from A, D and the printed angle)	.074(ref)
L	Max grip + L: datum to the end of the screw	.941(ref)
Recom. Hole	Drilled hole	.347/.344

All dimensions (21)

A'	Head diameter, min (head edge)	.608min
E	SLEEVE and SCREW head diameter (2X)	.3433max
F	SCREW wrench flats, on the tail	.185/.180
R	NUT head-to-shank radius	.040max
S	Head edge height	.015max
Min Avail. Grip	Min available grip dash	-200
J	Installed blind head diameter	.525min
K	Installed: blind side protrusion	.575max
Break-Off	Screw break-off, measured from the skin surface	+.103/-.000
Tensile	Tensile structural failure, min (lbs)	4400min, lbs
Double Shear	Double shear, min (lbs)	13850min, lbs
Locking Torque	Locking torque, min (in-lbs)	4.0min, in-lbs
V	Gage protrusion (inspection)	.0302/.0276
W	Gage diameter (inspection)	.5389/.5385
Grip limits	Dash 11-1550	1.500-1.550

As printed on MBF2013 Rev AG 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	.2630
NUTnut nose end, from the datum	0.162 x L - G	-1.7654
NUTnut bore = screw thread crest diameter (diameter)	0.713 x D	.2442
SCREWscrew thread crest diameter (threads not modelled)	0.713 x D	.2442
SLEEVEsleeve bore over the nut nose and the insert (diameter)	0.839 x D	.2873
SLEEVEsleeve bore beyond the insert (diameter)	0.729 x D	.2497
INSERTinsert outside diameter (= sleeve bore)	0.839 x D	.2873
INSERTinsert inside diameter (= sleeve bore beyond the insert)	0.729 x D	.2497
INSERTinsert end, from the datum	0.368 x L - G	-1.9438
SLEEVEcrimp line (start of the crimped band), from the datum	0.723 x L - G	-2.2514
SCREWscrew head top (sleeve end), from the datum	0.828 x L - G	-2.3417
SCREWscrew head corner radius	0.062 x E	.0212
SLEEVEsleeve top, from the datum (where the scaled nose meets the scaled sleeve bore)	0.113 x L - G	-1.7225
NUTnut nose taper (included angle)	angle, as drawn	31.6°
SCREWscrew tail beyond the head top	0.990 x D	.3392
SCREWwrench flats run: tail end to the head (as drawn)	as drawn	.3392

Measured on MBF2013 Rev AG sheet 1 figure at 300 dpi and kept as a ratio to a dimension this part number prints. Figure scale 454.1 px/in, fitting row -11, taken from A and E; checked against D (-0.3%), F (-1.7%), L - G (-1.2%).

Also printed in MBF2013 Rev AG for this part

Recommended hole	.344-.347 in (MBF2013 Rev AG sheet 1)
Installed blind head	J .525 in min diameter (MBF2013 Rev AG sheet 1)
Installed protrusion	K .575 in max (TYPICAL INSTALLATION) (MBF2013 Rev AG sheet 1)
Break-off limits	+.103 -.000 in, measured from the skin surface (MBF2013 Rev AG sheet 1)
Tensile	4400 lbs min (structural failure) (MBF2013 Rev AG sheet 1)
Double shear	13850 lbs min (MBF2013 Rev AG sheet 1)
Locking torque	4.0 in-lbs min (MBF2013 Rev AG sheet 1)
Min available grip	dash -200 (MBF2013 Rev AG sheet 1)
Material and heat treat	NUT: 6Al-4V TITANIUM ALLOY PER MIL-T-9047 STA OR AMS4928 OR AMS4967 HEAT TREATED PER MIL-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 STAINLESS STEEL PER AMS5639, FULLY ANNEALED. INSERT: ACETAL PER ASTM-D4181. (MBF2013 Rev AG material and finish notes)
Finish	( - ) NUT: KAL-GARD ANN-R0 #1012 CONVERSION COATING OR PHOSPHATE FLOURIDE PER MONOGRAM SPECIFICATION PS741, MAY BE USED AT MANUFACTURER'S OPTION. SLEEVE AND SCREW: PASSIVATE PER ASTM-A-967-96, KAL-GARD ANN-RO #1013 CONVERSION COATING OPTIONAL. INSERT: NONE (MBF2013 Rev AG material and finish notes)
Lubricant	SOLID FILM LUBRICANT PER AS5272 TYPE I OR MIL-PRF-81329, PARAFFIN WAX, OR CETYL ALCOHOL PER AS87132 (AS REQUIRED FOR PERFORMANCE). (MBF2013 Rev AG 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 MBF2013 Rev AG ↗ sheet 1.Drawing notes

Section drawn from the printed values in Monogram drawing MBF2013 Rev AG sheet 1 (blind fastener, low profile 130° flush head). Letters are the drawing's. Manufacturer nominal: printed values, the mean where only two limits are printed. Head cone held at the printed 130° (131° 129°). Section through the axis: NUT, SCREW, SLEEVE, INSERT as the drawing names them, each hatched on its own. Max grip 1.550 plus G .075 and L .941. 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 MBF2013 Rev AG sheet 1 figure and are not drawing dimensions; the INSERT is all scaled (dashed outline). Threads not modelled.

Model: Monogram drawing MBF2013 Rev AG

Envelope model, not manufacturer CAD.Model details

MBF2013-11-1550, manufacturer nominal. Simplified component model from Monogram drawing MBF2013 Rev AG 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. 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

MBF2110-11-1550 low profile protruding head
MBF3004-11-1550 reduced protruding hex head
MBF3005-11-1550 100° flush head

MBF2013 grip chart: 11/32" (-11)

31 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:

MBF2013-5-1550 MBF2013-6-1550 MBF2013-7-1550 MBF2013-8-1550 MBF2013-9-1550 MBF2013-10-1550 MBF2013-12-1550

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.

Install tooling

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

MGFCL-11 Flush head barrel gage (break-off check)
RM3118-11 Removal nose piece module, flush

Composi-Lok II tool tables

Decode details

Decode details
Series	Composi-Lok
Decode confidence	high
Numbering source	Monogram drawing MBF2013 Rev AG, title block, dimension and grip tables, material notes

Grip dash = max grip in thousandths of an inch (MBF2013 Rev AG 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

MBF2013-11-1550 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 MBF2013-11-1550

Composi-Lok II by Monogram, blind bolt
Datasheet (PDF) ↗
Manufacturer page ↗
Numbering: Monogram drawing MBF2013 Rev AG, title block, dimension and grip tables, material notes ↗
Geometry: MBF2013 Rev AG ↗

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 2026-09-28.