Bsi bs au 026 1964 (2000)

BRITISH STANDARD AUTOMOBILE SERIES BS AU 26 1964 (Supersedes S M M T Standard No 62) Incorporating Amendment No 1 Specification for Towing jaw for use between trailers of 5–16 tons gross weight and to[.]

Sta nd a rd No 6 )

Incorpora ting

Amend ment No 1

U C 6 9.1 0 3.5:6 9.1 0 3.3

This BritishStan ard, ha ing

b en a pro ed b the

Automo ileIn ustry

Stan ardsCommite an

en or ed b the Chairman

oftheEngine ring Divisional

Cou cil, was published u der

theauthority of the General

Cou cil of the Institution on

1 Ju e1 6

© BSI0 -2 0

The folowing BSI reference

relates to the work on this

stan ard:

Commite reference A E/

-ISBN 0 5 0 3 5 9 1

Am endm ents is ued sinc publ cation

Amd No Date of is ue Comments

72 Aug ust 19 8 Indicated b a sidelne in the marg in

B

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

Industry Stand rd s Commit e of the BSI, is b sed upon d ata-she t

SMMT62:19 7 of the Society of Motor Man facturer an Tra er Ltd The

req uirements of this stand ard , 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 ty

betwe n commer ial an Gov ernment dep rtment an Serv ices stand rd s

Towing jaws ma be forg ed ( as shown in Fig ure) or cast

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 BS AU29

1)

The jaw has be n

desig ned to ac ommod te a drawb r ey e of2in internal d iameter and1; in stock,

or3 in internal diameter and1C in stock

The stand rd a ples to connections to trai er of5–16tons g ros weig ht The

specification for a towing jaw for con ections to trai er of5–3 tons g ros

weig ht is g iv en in BS AU28

2)

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

BSA U24

3)

N T If it is re uired to conv ert the fig ures in this stan ard fom British u its into metric u its it

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

ta bl es”, b used Attention is drawn to BS2 5 , “Precis conver sion of inch a nd metric size on

en ine r in d r a win 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 an 2 and 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)

BS A 2 ,“Dr a wba r eye a nd foreca r r ia ge pins for on eton betwen tr a il er s of5–3 5tons

gros weig t a nd towin vehicle ”

2)

BS A 2 ,“Towin ja w for us betwe n tr a il er s of5–3 tons gros weig t a nd towin vehicl e”

3)

BS A 2 ,“Towin con e tons for tr a iler s of2–5tons gros weig t

1 Scope

This BritishStand rd specifies the b sic

dimensions and q ual ty of materials for a towing jaw

an its mou ting , for use in connections betwe n a

towing v ehicle and a trai er of5– 16 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 jaw shal be mad e f om a material of q ual ty not

les than BS9 0

4)

En3A for the forg ed jaw, or

BS5 2A

5)

for the cast jaw, both materials to be in

their normalz d condition

The towing pin shal be ma e fom a material of

q ualty not les than BS9 0

4)

En8Q

3 Dim ensions

Dimensions shal be as shown in the fig ure The

ring ed d imensions are es ential for

inter hang ea i ity , other d imensions a ply to the

forg es jaw and are for g uid nce only

NOT The d imensions sp cified for the forg d jaws ha e b en

calculated on the b sis of the total yield strength b ing not les

than two thirds of the gros weight b ing towed I is neces ary

that any ther p rts not cov ered b this stan ard,con ecting the

coupling to the towing v hicle shal hav e a similar strength

4 Desig n

An eficient safety locking dev ice shal be prov ided

as indicated in the Fig ure to prev ent ac idental

extraction of the towing pin fom the jaw

The jaw shal be so d esig ned that a b r1< in

d iameter ma be p s ed f e ly betwe n the pin an

the inside faces of the jaw ( se Fig ure)

The jaw shal be mounted with four bolts, Cin

d iameter, at4 in×4in centres This render it

inter hang ea le in mou ting with ho ks specified in

BS AU25

6)

and BS AU27,

7)

and with certain

Gov ernment dep rtment and Serv ices stand rd

ho ks

Bolts an n ts shal comply with:

i BS10 3

8)

thread ed BSF, cod e sy mbol R, or

i ) BS17 8

9)

thread ed UNF, code sy mbol R

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

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

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

6 Ma rking

The fol owing working , in clear let ering Bin hig h,

raised or impres ed, shal be marked on each towing

ho k:

“TO TOW16TONS GROS ” on one side, and on

the other side “BS AU26”

4)

BS9 0, “Wr ou ht stel s in the for m of ba r s, bil ets a nd for gin s, up to6 in r ul in s cton, for a utomo il e a nd genera l

en ine r in pur pos s En sr ie”

5)

BS5 2, (inclu ing BS3 0 ), “Ca r bon stel ca stn s for gener a l en ine r in pur pos s”

6)

BS AU2 , “Towin ho k for us betwen tr a il er s of5– 4tons gr os weig t a nd towin vehicle”

7)

BS AU2 , “Towin ho k for us betwen tr a il er s of5– 3 tons gr os weig t a nd towin vehicle”

8)

BS1 8 ,“Pr ecision hega gon b l ts, sr ews a nd n ts”

9)

BS1 6 ,“Unified pr ecision hex a gon b l ts,s r ews a nd n ts (UNC a nd UNF thr ea d -nor ma l s r ie ) ”

B

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