Bsi bs a 275, a 276, a 277, a 278, a 279, a 280 1981 + a2 2011

raising standards worldwide™ NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI Standards Publication AEROSPACE SERIES Specifcation for Hexagon self‑locking nuts with non‑metal[.]

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BSI St andards P ubl c at ion

Série aérospatiale: Sp cifcatio d s écro s h x ag naux auto-blocables av ec grains

Luft- u d Raumf ahr -Reih : Sp zifkatio f ür Sechskant-Sich ru gsmut ern mit

Publ shin an co y r ight inf or mat ion

T he BSI co yrig t n tice display ed in this d cument in icates w hen the

d cument w as las is ued

© BSI 2 1

ISBN 9 8 0 5 0 7 746 7

ICS 49.0 0.3

T he f olow in BSI references relate to the w ork o this s an ard:

C mmit e ref erence A CE/12

Draf t f or comment 7 /7 124 DC; 10/3 2 40 3 DC

Fir t p blshed February 19 1

Cont ent s

Ap e dix A C oar se t hr ead pit c h se es for size c od s 0 0, 10 an 120 8

Ap e dix B For eig mat er ials an fnis hes 9

L is of fg res

L is of t ables

Table 2 – Materials 5

Table 3 – St e gths 6

Table 5 – Dime sio s 8

Table 6 – Materials 8

Table 7 – St e gths 8

S mmar y of pa es

T his d cume t comprises a f ro t cov er, an insid fro t cov er,

pag s i to i pag s 1 to 10, an insid back cov er an aback cov er

Forew ord

T his British Stan ard is p bl she by BSI an came into ef ect o

2 Fe ruary 19 1 It w as pre are by T ch ical Commit e A CE/12,

Aerospa e f ste er and f ste ing systems, detais and pars A ls

re u s to it secretary

BS A 2 5,A 2 6, A 2 7, A 2 8, A 2 9, A 28 :19 1+A 2:201 su er e es

BS A 2 5,A 2 6, A 2 7, A 2 8, A 2 9, A 28 :19 1+A 1:19 2, w hich is

w ith raw n

Relat ionship w it h ot her publ cat ions

T hese British Stan ards prov id a series of met ic,hex ag n n t

w ith n n-metal c lockin inser s T he dime sio al data is base o

that already agre d in ISO/T C 20/SC 4, A ircraf t an space v ehicles –

A erospace f as e er sy stems How ev er, it sh uld b n te that th

acros fat dime sio s for diameter MJ3, MJ10, MJ12 an MJ14 are

diff ere t f rom th dime sio s agre d in ISO/T C 2, F s e er , f or n n

aerospace use

Inf or mat ion about t his docume t

T he s ar an fnish of tex t int o uce or altere by A me dme t

No 1 an No 2 is in icate in the tex t by tags !" an #$

Min r e itorial chan es are n t tag e

T his p blcatio d es n t p rp r to inclu e al th n ces ary prov isio s

of a cont act User are resp nsible f or it cor ect ap l catio

C mpla ce w it h a B tish St an ard ca not conf er immu ity f rom

le al o l g t ions

1 Scope

These British Stan ards sp cif y materials, dime sio s, protectiv e

h xago ( thick) self -lock in n t , w ith n n-metal c inser s an havin

MJ screw threads

T hey are primari y inte de f or use o n n-s ructual aerospace

ap lcatio s and hav e o eratio al temp rature lmitatio s of − 0 °C

to+120 °C

Coar e thread series f or size co es 0 0, 10 and 120 hav e b e

inclu e in A pp n ix A for th se user w ishin to sp cif y th m

These s an ar ds mak e r efer ence to th folowin s an ar ds p blcatio s

an Minis r y of Defence p blcatio s

P ar t 3 T c hnic al d lver y c on it io s for semi-fnish d

pr od c ts, bar s, r ods, wir e, sec tio s an br ig t

pr od c ts of cor r osio r esist i g s e ls for g n r al

s re gth ≤1450 MPa, co p r, co p r al oy s an

bar f or th man f acture of forg d b lt an

f orge n t "

bi et , bar , f orgin s an par s ( 88 -10 0 MPa;

s e l bar s for th man f actur e of for ge b lt an

for ge n t "

Ministry of Defe ce pu lc tio s

T he lates is u of th se p blcatio s shal b use

3 Perf or mance and procurement

4.1 Dime sions A ll n t shal conform toth dime sions an

tolerances giv en in Table 1 an Fig re 1 Unles oth rw ise sp cife ,

th dime sio s shal ap ly after th ap lcatio of th protectiv e

t eatme t

4.2 Screw t hrea s T he screw threads shal b as giv en in

#BS A 3 8$ to the tolerance clas specife in Table 1

4.3 Mat er ials T he materials shal b as giv en in Table 2 or A pp n ix B

4.4 Mech nical pro er t ies T he mechanicalpro er ies shal co f orm

to th se giv en in Table 3

4.5 S rf ace rou h es T he surf ace rou h es shal b R

a 6.3 m m

ex ce t w here in icate oth rw ise in Fig re 1 an shal b in

ac ordance w ith BS 1 34 T his re uireme t d es n t ap ly to

th threads, w hich shal be as achiev ed by n rmal meth ds of

Fig re 1 C nfg r at ion

!

"

NOTE 1 Co to r at man f cturer’s o tio , b t to le within dimensio s q oted

NOTE 3 Be rin surf c may be fat to co c ve, b t shal n t be co vex

NOTE 4 F rm ofenty to be either chamf r or radius within lmitin dimensio s

NOTE 5 Bre k sharp corner 0 1 mm to 0 4 mm

NOTE 6 Lockin inser h usin external planform shal le within the b u daries of the hexag nal

wrenchin f ature After securin the lockin inser, the closin diameter shal n t be less than the n minal

thre d diameter

Table 1 Dime sions

All dimensio s are in mi imet es

Size

co e

D

T hread

Dia × pitch – T l clas min max min tol ± 0.3 max max min max min min max min

016 MJ1.6 × 0.3 – 4H6H 3.3 3.2 3.0

h12

1.3 2.5 2.3 1.1 2.2 1.6 – – – 0.0 0.15

020 MJ2 × 0.4 – 4H6H 4.2 4 3.8 1.6 2.9 2.7 1.3 2.6 2.0 – – – 0.0 0.15

02 MJ2.5 × 0.45 – 4H6H 5.3 5 4.8 2 3.6 3.3 1.7 3.1 2.5 – – – 0.0 0.15

030 MJ3 × 0.5 – 4H6H 6.5 6 5.8 2.4 4.1 3.8 2.0 3.6 3 5.4 0.4 0.2 0.1 0.2

0 0 MJ4 × 0.7 – 4H6H 7.6 7 6.85 3.2 5.5 5.1 2.6 4.6 4 6.4 0.5 0.2 0.1 0.2

050 MJ5 × 0.8 – 4H6H 8.7 8 7.85 4 6.7 6.2 3.3 5.6 5 7.4 0.5 0.2 0.1 0.2

0 0 MJ6 × 1 – 4H5H 10.9 10 9.78

h13

5 8.1 7.5 3.9 6.8 6 9.3 0.5 0.2 0.1 0.2

*0 0 MJ8 × 1 – 4H5H 14.3 13 12.7 6.5 9.8 9.0 5.2 8.8 8 12.2 0.5 0.2 0.1 0.2

*10 MJ10 × 1.2 – 4H5H 18.9 17 16.7 8 12.3 1 3 6.5 10.8 10 16.0 0.6 0.3 0.13 0.2

*120 MJ12 × 1.2 – 4H5H 21.1 19 18.67 10 14.0 12.8 7.8 12.8 12 18.0 0.6 0.3 0.13 0.2

14 MJ14 × 1.5 – 4H5H 24.5 2 21.67 1 16.4 15.0 9.1 14.8 14 21.0 0.6 0.3 0.15 0.2

16 MJ16 × 1.5 – 4H5H 26.8 24 2 67 13 18.1 16.5 10.4 16.8 16 2 0 0.6 0.3 0.18 0.3

18 MJ18 × 1.5 – 4H5H 30.2 2 26.67 15 19.8 18.0 1 7 18.8 18 26.0 0.6 0.3 0.18 0.3

20 MJ20 × 1.5 – 4H5H 3 6 30 29.67 16 21.5 19.5 13.0 20.8 20 29.0 0.6 0.3 0.18 0.3

* For user w ishing to sp cif y coar e thread pitch s f or size co es 0 0, 10 an 120, se A pp n ix A

Table 2 Mater ials

Basic

BS n mber

mater ial

Soa †

t emper at ure

l mit s

Oper at ion l

t emper at ure

lmit s

A 2 5 Ste l

S105!§"

S147

S154

S158

28 to 3 HR 28 to 3 5 HV Cadmium plate

an pas iv ate to

#DE STA N 03-19

or BS EN 213 $

Nylo

ty pe

− 0 °C

to +20 °C

− 0 °C

to +120 °C

A 2 6 Cor osio resis in

s e l‡

#X 5CrNi17-7

X 5CrNiMo17-12-2

X 6CrNiTi18-10

X 8CrNiS18-9

X 5CrNi18-10$

!9 HRB" to 26 HR !20 " to 265 HV

Pas iv ate to

DE STA N 03-2

Meth d M

Nylo

ty pe

− 0 °C

to +20 °C

− 0 °C

to +120 °C

A 2 7 Bras

#BS EN 1216

( CW 614N)$

an pas iv ate to

#DE STA N 03-19

or BS EN 213 $

Nylo

ty pe

− 0 °C

to +20 °C

− 0 °C

to +120 °C

* In th ev ent of a dispute, th Vick r hard es shal tak prece e ce

† Items shal not be damag d af ter th se soak temperature lmit hav e be n ap le ina cordance w ith perf ormance an procureme t specifc tion #BS A 2 3$

‡ A ccordin to #BS EN 10 8 : Par 3$

!§ S10 is an o solesce t s an ard an it use is only permit e w hie ex isin socks las "

Table 3 Ste gt hs

A x ial t ensie s re gt h* kN min

!* W he use w ith b lt of te gthclas ifc tion (σ

B ) 9 0 MPa for se l 6 0 MPaf or C.R.S an 4 0 MPa for bras

th ax ial te sie sre gth=

π

σ

4 3 2

d

B

w here

d

3

is th core diameter."

5.1 A n ex ample of par n mber is as f ol ow s

6.1 Mar k in of par ts E ch n t shal be mark d at th p sitio

indicate in Fig re 1 w ith th f olow ing

b) T he minimum data o th fat op osite that b aring th

man facturer’s mo o ram, as sh w n in Table 4

Table 4 Mar k in

10

120

14

16

18

20

6.2 Method of mar kin T he markin shal b etch d, s amp d, or

e grav ed at th man f acturer’s optio T he impres e character shal

b n t greater than0.2 mm in d pth an shal b of ro nd d ro t

f orm T he markin shal n t hav e an adv er e eff ect o p rf ormance

A ppendix A Coar se t hread pit ch ser ies f or size codes 080, 100 and 120

A 1 T his app n ix giv es th re uireme t f or th man f acture ( se A 2 an Tables 5, 6 an 7) an d sig atio

( se A 3) of th coar e thread pitchseries f or size co es 0 0, 10 an 120

For al oth r information se th prev io s clauses

Table 5 Dime sions

A lldime sio s are in mi imet es

Size

cod

D

T hre d

Dia × pitch − T l clas min max min tol ± 0.3 max max min max min min max min

0 0 M8 × 1.2 − 4H5H 14.3 13 12.7

h13

6.5 9.8 9.0 5.2 8.8 8 12.0 0.5 0.2 0.1 0.2

10

!M10 × 1.5 − 4H5H"

18.9 17 16.7 8 12.3 1 3 6.5 10.8 10 16.0 0.6 0.3 0.13 0.2

120 M12 × 1.5 − 4H5H 21.1 19 18.67 10 14.0 12.8 7.8 12.8 12 18.0 0.6 0.3 0.13 0.2

A 2 T he screw threads shal b as giv en inBS 36 3 to th tolerance clas sp cife in Table 5

Table 6 Mat er ials

Basic BS n mber Ty pe of mat er ial Mat erial specifcat i n Protec iv e t reat me t

}

Se Table 2 Se Table 2 or A pp ndix B

A 2 9 C.R.S

Table 7 St re gt hs

T hre d size

A x ial t ensie st re gt h * k N min

A 278 ( Ste l) A 279 ( C.R.S.) A 2 0 ( Bras )

* Se fo tnote to Table 3

A 3 Designat ion

A 3.1 A n ex ample of par n mb r is as fol ow s

subs itute f or th se ls e in this s an ard It is th man f acturer’s

respo sibi ty to e sure complete t aceabi ty of the materials use

satisf actio of th Qualty A ssurance A uth rity

UK material as cale for inthis s an ard Fre ch alternativ e

3 CD4S( A IR 916 )

UK fnish as cale f or in this s an ard Fre ch alternativ e

} A IR 3 76

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