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PUBLICATION OF BRITISH STANDARD BS 8666:2000 Sch eduling, d i m en si o ni n g, b en ding an d cut t i n g o f steelr ei n for cem en t for co n cr ete I m po r t an t chan ges have t aken place i n t he s che dul i ng o f rei nf or cem en t . A new Br i tish Stan dard, Sp eci fi cati on for sched uling, di m en si oni ng, b en di ng an d cu t ting of s t eel reinf or cem ent f or concr et e, BS 8 666:2000, cam e i nto ef f ect on 15 t h A pr i l 20 00. Th i s replaces BS 44 66:1989, w h ich has been w it h dr aw n. Th er e ar e signi f i can t di f f er ences bet w een the t w o st an dar ds , w hi ch can b e sum m ar i sed as f ol l ow s: • Notation - chan ges i n t he d esignat i on o f t he t ype and gr ade of steel r einf or cem en t • Shape Codes - t hese are r e- designated and r ed uced in num ber , f r o m 27 to 16 • Minimum bending former diameters - these are g en eral l y r ed uced i n si ze D espi te the i ssue of t his new st an dard i t is clear t hat BS 8666 and BS 4 466 w i l lrun i n paral lel for som e tim e and r ei nf or cem ent f ab r i cat or s w i l l be exp ected t o pr ocess or ders accor di ng to bot h. You can, how ever, be assur ed t hat C A RES ap pr oved rei nf or cem ent f ab ricat or s w ho operat e an ap pr oved m an ag em en t syst em f or qu al i t y, wi l l ensur e t hat yo ur o r der r equi r ement s are ful f i ll ed in f ull com pl i an ce w i t h t he req uired Br it i sh St an dard. For eas e o f r ef er en ce the s h ap e cod es f rom B S 4 466: 19 89 an d B S-86 66 :2000 are show n o ver l eaf. Sh ould you h ave any qu er ies r eg ar di ng t he u se of t his st an dar d, ho w i t di f f ers in detail or how i t sho u ld be used i n practi ce then p l ease co nt act your C A RES ap pr oved rei nf or cem en t f ab ricat or. A lt ernati vel y contact C A RES di r ectl y o r visi t ou r w ebsi te:w w w.ukcares.com
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PUBLICATION OF BRITISH STANDARDBS 8666:2000
Scheduling, dimensioning, bending and cuttingof steel reinforcement for concrete
Important changes have taken place in the scheduling of reinforcement. A newBritish Standard, Specification for scheduling, dimensioning, bending and cuttingof steel reinforcement for concrete, BS 8666:2000, came into effect on 15th April2000. This replaces BS 4466:1989, which has been withdrawn. There aresignificant differences between the two standards, which can be summarised asfollows:
Notation - changes in the designation of the type and grade of steel reinforcement
Shape Codes - these are re-designated and reduced in number, from 27 to 16
Minimum bending former diameters - these are generally reduced in size
Despite the issue of this new standard it is clear that BS 8666 and BS 4466will run in parallel for some time and reinforcement fabricators will be expectedto process orders according to both. You can, however, be assured that CARESapproved reinforcement fabricators who operate an approved managementsystem for quality, will ensure that your order requirements are fulfilled in fullcompliance with the required British Standard.
For ease of reference the shape codes from BS 4466:1989 and BS-8666:2000 areshown overleaf. Should you have any queries regarding the use of this standard,how it differs in detail or how it should be used in practice then please contactyour CARES approved reinforcement fabricator. Alternatively contact CARESdirectly or visit our website: www.ukcares.com
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6 24 4d 36 6d8 32 4d 48 6d
10 40 4d 60 6d
12 48 4d 72 6d
16 64 4d 96 6d
20 140 7d 120 6d
25 175 7d 200 8d
32 224 7d 256 8d
Minimum former diameter / mm
BS 4466
/mm
BS 8666
/mm
Nominalbardiameter
Grade 460 -
Shape and total length of bar (L) measured along centre-line
BS 8666:2000:Standard Shapes
(C)
DB
A
Minimum bending former diameters Notation
N.B The former diameter for 20mm bar has been increased from 6d to 7d.
Grade 250 - no change between BS 4466 and BS 8666.
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A
00
Total length (L) = A
13
A
(C)
BSEMI CIRCULAR
Total length (L) = A +-0.57B-+-(C)-- 1.57d
25
(E)
C DA B
Total length (L) = A + B + (E)
33
A
(C)
BSEMI CIRCULAR
Total length (L) = 2A + 3B +14d
46
C
D D
B B
A (E)
Total length (L) = A + 2-B-+-C-+-(E)
77
Total length (L) = C.pi.(A - d)
A
C: number of turns
B
Total length (L) = 2(A +-B-) +-16d
B
C
(D)
A
51
Total length (L) = A + B +-C-+D-+(E) - 2r - 4d
41
C
A
DB
(E)
26
Total length (L) = A + B + (C)
(C)
A
B
Total length (L) = A +-(C)
15
Total length (L) = A +-(B) - 1 1/2r - d
11
(B)
A
(B)
AR
Total length (L) = A +-(B) - 1/2R - d
12
B
A(C)
21
Total length (L) = A +-B-+-(C) - r - 2d
31
C
A
(D)B
Total length (L) = A + B +C +(D) - 1 1/2r - 3d
44
C
A
D
B
(E)
Total length (L) = A +-B-+-C-+-D-+-(E) - 2r - 4d
67
A
R
Total length (L) = A
BS 4466 GradeBS 8666
R R 250 conforming to BS 4449
F D 460 deformed type 1 conforming to BS 4482(for fabric conforming to BS 4483)
D T 460 deformed type 2 conforming to BS 4482or grade 460A conforming to BS 4449
(for fabric conforming to BS 4483)
W W 460 plain round conforming to BS 4482(for fabric conforming to BS 4483)
T T 460A or 460B deformed type 2 conformingto BS 4449
B T 460B deformed type 2 conforming toBS 4449 (for bar or fabric conforming toBS 4483)
S S a specified grade and type of stainless steelconforming to BS 6744
X X reinforcement of a type not included in theabove list having material properties that aredefined in the design or contractspecification
99 All other shapes where a standard or combination of standard shapes cannot be used.A dimensioned sketch shall be drawn over the dimension columns A - E.Total length (L) = To be calculated
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All other shapes where a standard or combination of standard shapes cannot be used.A dimensioned sketch shall be drawn over the dimension columns A - E. Total length (L) = To be calculated
A
(C)
B SEMI CIRCULAR
Length = A + 0.57B +-(C) - 1.57d
39 41
43 B
DA (C)
Length = A + B-+-(C)-- 1/2r - d
51
54
(C)
DB
A
Length = A + (B) - 1/2R - d
B
A
A
Length = A
20
A
h
Length = A + h
32
A
(C)
BSEMI CIRCULAR
Length = A + 2h
33
A
n
Length = A + n
34
A
n n
Length = A +-2n
35
(B)
A R
Length = A +-(B) - 1/2r - d
37
B
A (C)r r
Length = A + B-+-(C)-- r - 2d
38
Length = A + B-+-(C)
C
DB
A
n
Length = A + B-+-C-+-n (if angle with horizontal is 45o or less)
42
(C)
D EA B
Length = A + B +-(C)
49
C
A
(D)B
Length = A + B +-C-+-(D) - 1/2r - 3d
52
C
DB
(E)A
Length = A + B +-C-+-D-+-(E) -2r - 4d
53
C
A
DB
(E)
Length = A + B +-C-+-D-+-(E) - 2r - 4d
55
Length = 2(A+B) +-12d
61
(C)
AB
Length = A + C
A
R
Length = A
65
A
BLength = 2A + B + 20d
77
B
A
C
Length = 2A + B + C + 3d
78
B
A
Length = 2A + 3B + 10d
79
A
BSEMI CIRCULAR
Length = 2A + 3B + 18d
82
A
B
CSemi-circular
(D)
Length = A + B +-0.57C +-(D) - 1/2r - 2.57d
85
A
C B
Length = C/B pi (A - d) (L 12m)
87
Length = A + 2B +-C-+-(E)
BS 4466:1989:Preferred and Other Shapes
Shape and total length of bar (L) measured along centre-line
B
A
(C)
r
r
Length = A + B +-(C) - r - 2d
62
45
C
D DB B
A (E)
(B)
A R (NON-STANDARD)
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99
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Square mesh:
A393 10 200 393 10 200 393 6.16
A252 8 200 252 8 200 252 3.95
A193 7 200 193 7 200 252 3.02
A142 6 200 142 6 200 142 2.22
A98 5 200 98 5 200 98 1.54
Structural mesh:
B1131 12 100 1 131 8 200 252 10.9
B785 10 100 785 8 200 252 8.14
B503 8 100 503 8 200 252 5.93
B385 7 100 385 7 200 193 4.53
B283 6 100 283 7 200 193 3.73
B196 5 100 196 7 200 193 3.05
Long mesh:C785 10 100 785 6 400 70.8 6.72
C636 9 100 636 6 400 70.8 5.55C503 8 100 503 5 400 49 4.34C385 7 100 385 5 400 49 3.41
C283 6 100 283 5 400 49 2.61Wrapping mesh:D98 5 200 98 5 200 98 1.54D49 2.5 100 49 2.5 100 49 0.77
Tolerances shall be in accordance with Table 4 of BS8666. For standard fabric the typeof wire shall be designated as a suffix to the fabric reference as illustrated in theexample in Figure 3 of BS8666. Standard lengths and widths shall be 4.8 m and 2.4 mrespectively, giving a sheet area of 11.52 m2.
Standard fabric types and stock sheet size
CARES, Pembroke House, 21 Pembroke Road, Sevenoaks, Kent TN13 1XRTelephone: 01732 450000 Fax: 01732 455917 www.ukcares.com
FAQsWhy has BS 8666 been adopted? The shape codes are part of a new ISO standard anda new European Standard. British Standards cannot be at variance with theseinternational standards and so BS 4466 has been changed. The new number is intendedto highlight the change.
The opportunity has also been taken to align the code with BS 4449:1997 - Carbon steelbars for the reinforcement of concrete and to recognise improvements in the processingof reinforcement to allow, generally, tighter bends to improve fit.
Why are there now two notations for the old T notation? BS 4449:1997introduced two new grades, 460A and 460B (see table 7 of BS 4449). Where a particulargrade is required the correct designation should be specified and used.
In the changeover period:How do we avoid confusion? State on bending schedules which standard is beingused, this is actually a requirement for conformity to both standards! As far as qualityassurance procedures allow try to avoid changing codes mid-project!
What will we get? Schedules to BS 8666 will be supplied to BS 8666; those to BS 4466will be supplied to BS 4466, each as contracted.
It may take some time for all reinforcement fabricators to convert to the formers inBS 8666. Please bear in mind that initially larger formers than those quoted in BS 8666may legitimately be used. However, if fit is critical please state the radius required.NB for 20 mm diameter bars the former diameter has increased from 6d to 7d in BS8666.
What about length/ bearing calculations? If detailing to BS 8666 use the BS 8666radii. If larger radii are actually used the free dimension will be increased by a fewmillimetres. For bearing calculations use the worse case radius.
How do I specify old shape codes? - Many of the old shapes (notably bob bars and linkshapes 77, 78 and 85) are now not covered by BS8666 and should be drawn up as shapecode 99s.
Copyright UK CARES 2000.
Fabricreference Normal
wire size
mm
Pitch
mm
Area
mm2/m
Normalwire size
mm
Pitch
mm
Area
mm2/m
Mass
kg/m2
Cross wiresLongitudinal wires
