AECMA STANDARD prEN 4172

NORME AECMA Edition P 1

AECMA NORM December 1999

PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA)

Gulledelle 94 – B-1200 BRUXELLES – Tel. (+32) 2 775 8110 – Fax. (+32) 2 775 8111

ICS: 49.030.60

Descriptors: aircraft industry, aircraft equipment, rivet, titanium alloy, specification, characteristic,
dimension, mass, dimensional tolerance, surface treatment, designation, marking

ENGLISH VERSION

Aerospace series
Lockbolts, protruding head,
sheartype, close tolerance,
in titanium alloy TI-P64001, anodized,
metric series
Classification: 1 100 MPa (at ambient temperature) / 315 °C

Série aérospatiale Luft- und Raumfahrt

Rivets à bague sertie, à tête cylindrique, Paßniete, mit Universalkopf, Schertyp,
à cisaillement, à tolérance serrée, aus Titanlegierung TI-P64001, anodisiert,
en alliage de titane TI-P64001, anodisés, metrische Reihe
série métrique Klasse: 1 100 MPa
Classification : 1 100 MPa (bei Raumtemperatur) / 315 °C
(à température ambiante) / 315 °C

This "Aerospace Series" Prestandard has been drawn up under the responsibility of AECMA (The
European Association of Aerospace Industries). It is published on green paper for the needs of AECMA-
Members. It has been technically approved by the experts of the concerned Technical Committee
following comment by the Member countries.
Subsequent to the publication of this Prestandard, the technical content shall not be changed to an
extent that interchangeability is affected, physically or functionally, without re-identification of the
standard.
After examination and signature of the AECMA Standard Checking Centre (NPS) and formal agreement
of the Official Services of the Member countries it will be submitted as a draft European Standard to CEN
(European Committee for Standardization) for formal vote.

Nota - Extra copies can be supplied by B.N.A.E. − Technopolis 54 - 199, rue Jean-Jacques Rousseau − 92138 ISSY-LES-MOULINEAUX CEDEX

Edition approved for publication Comments should be sent within six months C3 Chairman
after the date of publication to
1999-12-31 AECMA Mr Visconti
Gulledelle 94
B-1200 BRUXELLES

 aecma 1999
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prEN 4172: 1999

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prEN 4172: 1999

1 Scope
This standard specifies the characteristics of lockbolts with protruding head, sheartype, close tolerance, in
titanium alloy TI-P64001, anodized, metric series, for use in aerospace applications.
Classification : 1 100 MPa 1) / 315 °C 2)
In both versions, i.e. with and without pintail these lockbolts fulfill the same function when installed and are
statically / dynamically equivalent.
They are intended to be used with collars to EN 4174 or EN 4175.

2 Normative references

EN 2424 Aerospace series - Marking of aerospace products

EN 2808 Aerospace series - Anodizing of titanium and titanium alloys

EN 4174 Aerospace series - Collars, swage locking, sheartype, in aluminium alloy 2024, anodized
or chromated, metric series 3)

EN 4175 Aerospace series - Collars, flanged swage locking, sheartype, in titanium TI-P99002,
metric series 3)

EN 4176 Aerospace series - Lockbolts, 100° countersunk normal head or protruding head,
tension- / sheartype, close tolerance, in titanium alloy TI-P64001, anodized or with
aluminium pigmented coating - Collars in titanium TI-P99002 or aluminium alloy 2024 -
Metric series - Technical specification 3)

MIL-L-87132B Lubricant, Cetyl Alcohol, 1-Hexadecanol, Application to Fasteners 4)

TR 3775 Aerospace series - Bolts and pins - National materials 5)

3 Required characteristics

3.1 Configuration - Dimensions - Masses

See figure 1 and tables 1 and 2.
Dimensions and tolerances are expressed in millimetres and apply after surface treatment.

3.2 Materials
TR 3775 (titanium alloy, strength class 1 100 MPa)

3.3 Surface treatments

EN 2808
Lubrication with cetylic alcohol (chlorine free) according to MIL-L-87132


1) Minimum tensile strength of the material at ambient temperature
2) Maximum temperature that the lockbolt can withstand without continuous change in its original characteristics, after
return to ambient temperature. The maximum temperature is determined by the material.
3) Published as AECMA Prestandard at the date of publication of this standard
4) Published by: Department of Defense (DoD), the Pentagon, Washington, D.C.20301, USA
5) Published as AECMA Technical Report at the date of publication of this standard
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prEN 4172: 1999

3,2  1,6 
  Values in micrometres apply prior to surface treatment.
 

Lockbolt,
version 'P'
with pintail
(pulltype)

Lockbolt,
version 'S'
without pintail
(stumptype)

Key
1 Location of manufacture's symbol
2 Sealant escape groove option: code G
3 Predetermined breaking point
4 Marking
5 Groove section at manufacturer's option
6 Lightening hole
7 Drill start
Figure 1

Table 1

Diameter D1 D2 D3 D4 L2 L4 K R
code 0
f7 – 0,51 max. max. max. max. min. max. min.

040 4 8,74 3,88 1,65 2,95 4,6 1,5 1,25

050 5 9,83 4,89 2,18 3 5 1,7 1,45 0,65 0,4
060 6 12,37 5,89 2,77 4,12 6,15 1,93 1,68
080 8 15,47 7,88 3,58 5,49 8,4 2,18 1,8
0,75 0,5
100 10 18,42 9,88 4,34 6,17 10,6 2,56 2,18
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prEN 4172: 1999

Table 2

Diameter code 040 050 060 080 100

b b b b b
Length Grip length L3 Mass L3 Mass L3 Mass L3 Mass L3 Mass
a
code L1 +2 +2 +2 +2 +2
± 0,25 over to 0 0 0 0 0
040 4 2 4 20,9 0,67 23,3 1,08 25,6 1,94 29,2 3,91 33,4 6,49
060 6 4 6 22,9 0,78 25,3 1,25 27,6 2,19 31,2 4,35 35,4 7,19
080 8 6 8 24,9 0,89 27,3 1,42 29,6 2,44 33,2 4,79 37,4 7,89
100 10 8 10 26,9 1,00 29,3 1,59 31,6 2,69 35,2 5,23 39,4 8,59
120 12 10 12 28,9 1,11 31,3 1,76 33,6 2,94 37,2 5,67 41,4 9,29
140 14 12 14 30,9 1,22 33,3 1,93 35,6 3,19 39,2 6,11 43,4 9,99
160 16 14 16 32,9 1,33 35,3 2,10 37,6 3,44 41,2 6,55 45,4 10,69
180 18 16 18 34,9 1,44 37,3 2,27 39,6 3,69 43,2 6,99 47,4 11,39
200 20 18 20 36,9 1,55 39,3 2,44 41,6 3,94 45,2 7,43 49,4 12,09
220 22 20 22 38,9 1,66 41,3 2,61 43,6 4,19 47,2 7,87 51,4 12,79
240 24 22 24 40,9 1,77 43,3 2,78 45,6 4,44 49,2 8,31 53,4 13,49
260 26 24 26 42,9 1,88 45,3 2,95 47,6 4,69 51,2 8,75 55,4 14,19
280 28 26 28 44,9 1,99 47,3 3,12 49,6 4,94 53,2 9,19 57,4 14,89
300 30 28 30 46,9 2,10 49,3 3,29 51,6 5,19 55,2 9,63 59,4 15,59
320 32 30 32 48,9 2,21 51,3 3,46 53,6 5,44 57,2 10,07 61,4 16,29
340 34 32 34 50,9 2,32 53,3 3,63 55,6 5,69 59,2 10,51 63,4 16,99
360 36 34 36 52,9 2,43 55,3 3,80 57,6 5,94 61,2 10,95 65,4 17,69
380 38 36 38 54,9 2,54 57,3 3,97 59,6 6,19 63,2 11,39 67,4 18,39
400 40 38 40 56,9 2,65 59,3 4,14 61,6 6,44 65,2 11,83 69,4 19,09
420 42 40 42 58,9 2,76 61,3 4,31 63,6 6,69 67,2 12,27 71,4 19,79
440 44 42 44 60,9 2,87 63,3 4,48 65,6 6,94 69,2 12,71 73,4 20,49
460 46 44 46 62,9 2,98 65,3 4,65 67,6 7,19 71,2 13,15 75,4 21,19
480 48 46 48 64,9 3,09 67,3 4,82 69,6 7,44 73,2 13,59 77,4 21,89
500 50 48 50 66,9 3,20 69,3 4,99 71,6 7,69 75,2 14,03 79,4 22,59
a
Measured from the bearing surface under the head to the end of full cylindrical portion of shank.
b
Approximate values (kg/1 000 installed pieces without collar), calculated on the basis of 4,45 kg/dm3, for information purposes
only. Mass reduction for version "S" = 5%. Average is depending of grip length.
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prEN 4172: 1999

4 Description
EXAMPLE:

Description block Identity block

LOCKBOLT EN4172P040–140G

Number of this standard

Lockbolt version 6) (see figure 1)

Diameter code (see table 1)

Length code (see table 2)

Sealant escape groove code (see figure 1)

NOTE If necessary, the code I9005 shall be placed between the description block and the identity block.

5 Marking

EN 2424, style C (see figure 1).

6 Technical specification
EN 4176


6) If it is not intended to define the version in the documents (with or without pintail, depending on whether riveting will
be manual or automatic), it is not necessary to give a code letter. However, the version has to be clearly indicated in the
purchase order.