Bsi bs au 027 1964 (2000)

BRITISH STANDARD AUTOMOBILE SERIES BS AU 27 1964 (Supersedes S M M T Standard No 52) Specification for Towing hook for use between trailers of 5–35 tons gross weight and towing vehicle UDC 629 11 013[.]

Sta nd a r d No.5 )

U C 6 9.1 0 3.5:6 9.0 3.8

This Bri shStan ard, ha ing

b en a pro ed b the

Automo ileIn ustry

Stan ardsCommi e an

en or ed b the Chairman of

theEng ine ring Divisional

Cou cil, was published

u derthe uthoriy of the

GeneralCou cil of the

Inst utonon

1 Ju e1 6

© BSI0 -2 0

The folowing BSI reference

relates to the work on this

stan ard:

Commi e reference AUE/

-Am endm ents is ued sinc publ cation

Pag e

This BritishStand ard, which is publ shed u d er the authority of the Automobie

Ind ustry Stand ards Commit e of The BSI, is b sed upon

d ata-she t SMMT52:19 7 of the Society of Motor Man facturer and

Tra er Ltd The requirements of this stand rd , which relate only to v ehicles

used on the publc hig hway s, are intended to ensure the ma imum deg re of

inter hang ea i ity betwe n commer ial and Gov ernment dep rtment and

Serv ices stand ard s

The material specifications are for the minimum qual ties ac epta le, and do not

exclude the use of other materials prov id ed that these are at least eq ual in q ual ty

so that roa safety is not imp ired

This stand ard should be used in conju ction with BSAU29

1)

The ho k has be n

desig ned to ac ommod te a drawb r ey e of3 in internal diameter and1

5

/

8

in

stock

The stand rd a ples to connections to trai er of5–3 tons g ros weig ht

Thespecification for a towing ho k for con ections to traier of5–14 tons g ros

weig ht is g iv en in BSAU25

2)

an for traier of2 –5 tons g ros weig ht in

BSA U24

3)

N T If i is re uired to conv ert the fig ures in this stan ard fom Bri sh u is into metric u is i

is recommen ed that the conv r ion factor an ta les contained in BS3 0,“Conver sion factor s a d

ta ble ”, b used Attenton is drawn to BS2 5 , “Pr ecis conver sion of inch a d metr ic sizes on

en ine r in d r awin s”

A British Stand ard d oes not purport to includ e al the neces ary prov isions of a

contract User of British Stand rd s are responsible for their cor ect a plcation

Com pl anc with a British Standard does not ofitself confer im m unity

f om leg al o l g ations

Sum mary of pag es

This document comprises a f ont cov er, an insid e font cov er, p g esi andi ,

p g es1 to3 an a b ck cov er

This stand rd has be n up ated ( se copy rig ht d ate) an ma hav e ha

amendments incorporated This wi l be indicated in the amendment ta le on the

inside f ont cov er

1)

BSAU2 ,“Dr awbar ye a d for ecar r ia e pins for on eton betwen tr aier s of5–35 tons

gr os weig t a d towin vehicle ”

2)

BSAU2 , “Towin ho k for us betwe n tr aier s of5–14 tons gr os weig t a d towin vehicle”

3)

BSAU2 ,“Towin con e tons for tr aier s of2–5 tons gr os weig t

1 Scope

This BritishStand rd specifies the b sic

dimensions an q ualty of materials for a towing

ho k and its mou ting , for use in con ections

betwe n a towing v ehicle and a traier of5–3 tons

g ros weig ht

The g ros weig ht refer to g ros la en train weig hts

where more than one traier is drawn

2 Materia ls

The ho k shal be ma e f om a material of q ual ty

not les than BS9 0

4)

En16( R)

Dimensions shal be as shown in Fig ure 1 an

Fig ure 2

NOT The dimensions sp cified are b sed up n a forg ed ho k,

an ha e b en calculated on the b sis of the total yield streng th

b ing qual to two thirds of the g ros weig ht b ing towed I is

neces ary that any other p rts not co ered b this stan ard,

con ectng the coupling to the towing ehicle shal ha e a similar

streng th

4 Desig n

An eficient safety catch, prefera ly of the automatic

or semi automatic ty pe, shal be prov id ed as

ind icated in Fig ure 1 to prev ent ac idental

d etachment of the drawb r f om the ho k

The ho k shal be so desig ned that a b r1

2

/

3

in

diameter, when held v erticaly , ma be p s ed

f e ly betwe n the insid e faces of the ho k with the

catch held b ck to clear ( se Fig ure 1)

The ho k shal be mou ted with four bolts,

3

/

4

in

diameter, at4 in×4 in centres

Bolts and n ts shal comply with:

i BS10 3, thr ea d ed B SF, cod e symbol R , o

5)

i ) BS17 8, thr ea d ed UNF, cod e symbol R

6)

The n ts shal be secured either b pe ning the end

of the bolt or b fit ing a positiv e locking d ev ice such

as a safe locking n t or a slot ed n t and spl t pin

6 Ma rking

The fol owing wording , in clear let ering

3

/

8

in hig h,

raised or impres ed, shal be marked on each towing

ho k:

“TO TOW3 TONS GROS ” on one side, and on

the other side “ BSAU27”

4)

BS9 0, “Wr ou ht stels in the for m of bar s, bi ets, a d for gin s,up to6 in r uln scton, for a tomo ie a d gener al

en ine r in pur pos s En sr ie”

5)

BS1 8 ,“Pr ecision hexa on b ls, s r ews a d n ts”

6)

BS1 6 ,“Unified pr ecision hexagon b ls,s r ews a d n ts (UNC a d UNF thr ea -nor mal s r ie )

A

B

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