BS EN 14399-9 DTI Washers

BS EN 14399-9 Composition of high-strength structural bolting assemblies and component marking

Type of bolting assembly System HR System HV System HRC
General requirements EN 14399-1
Suitability for preloading EN 14399-2 and, if any, additional testing specified in the product standard
Bolt and nut EN 14399-3 EN 14399-7 EN 14 399-4 EN 14399-8 EN 14399-10
Marking Bolt HR8.8 HR10.9 HR8 .8 HR10.9 HV10.9 HVP10.9 HRC 10.9
Nut HR8 or HR10 HR10 HR8 or HR 10 HR10 HV 10 HV 10 HR 10 HRD 10
Washers EN 1439 9-5 a or EN 14399-6 EN 14399-6 EN 14399-5 8 or EN 14399-6
Marking H or HRb H or HV b H or HRb H or HRb or HD c
Direct tension indicator and nut face washer or bolt face washer, if any EN 14399-9 Not applicable
Marking Direct tension indicator H8 H10 H8 H10 H10
Nut face washer HN HN
Bolt face washer HB Not applicable HB
  • a EN 14399-5 can on ly be used under the nu t.
  • b At the choice of the manufacturer.
  • c Manda tory mark for washers with en larged outer d iame ter according to EN 14399-5 only

BS EN 14399-9 Specifications and reference standards

Specifications and reference standards for direct tension indicators

Material Steel
General requirements EN 14399-1 and EN 14399-2
Heat treatment hardened and tempered or controlled rolled and tempered
Maximum hardness 380 HV
Finish-Coatinga Uncoated as processed c
Sherardized b EN ISO 17668
Others to be agreedd
Associated bolts and nuts EN 14399-3 , EN 14399-4, EN 14399-7 or EN 14399-8
Associated washers EN 14399-5 or EN 14399-6
Acceptability For acceptance procedure , see EN ISO 3 269:2000
  • a The direct tens ion ind icators shal l not be electrop lated or subjected to any process that could result in hydrogen embrittlement.
  • b Sherardizing is considered to provide corros ion protection equivalent to hot dip galvaniz ing.
  • c “As processed” means the normal finish resulting from manufacture with a light oil coating.
  • d Other coatings may be negotiated between the purchaser and the manufacturer providing they do not impair the mechanical properties or functional characteristics . Coatings of cadmium or cadmium alloys are not permitted .
  • e For acceptance criteria use 0 ,65 AQL , Ac = 0 ; see EN ISO 3 269: 2 000.

Specifications and reference standards for nut face washers (HN) and bolt face washers (HB)

Material Steel
General requirements EN 14399-1 and EN 14399-2
Heat treatment hardened and tempered
Hardness a Rockwell hardness 38 HRC to 45 HRC
European Standard EN ISO 6508-1
Vickers hardness 372 HV30 to 448 HV30
European Standard EN ISO 6507-1
Tolerances Product grade C b
Standard EN ISO 4759-3
Finish-Coatingthth Uncoated as processed d
Sherardized EN ISO 17668
Others to be agreed e
Associated bolts and nuts EN 14399-3 , EN 14399-4, EN 14399-7 or EN 14399-8
Associated washers EN 14399-5 or EN 14399-6
Acceptability For acceptance procedure , see EN ISO 3 269: 2000.
  • a In case of dispute , the Vickers hardness test shall be the referee test method .
  • b Except as otherwise specified.
  • c These washers shall not be electrop lated or subjected to any process that could result in hydrogen embrittlement.
  • d “As processed” means the normal fin ish resulting from manufacture with a light oil coating.
  • e Other coatings may be negotiated between the purchaser and the manufacturer providing they do not impair the mechanical properties or functional characteristics. Coatings of cadmium or cadmium alloys are not permitted.

BS EN 14399-9 Test compression loads at 0 ,40 mm gap

Nominal size d (nominal thread diameter of associated bolt) Compression load
Designation H8 Designation H10
 min.  max. min. max.
M12 47 56 59 71
M16 88 106 110 132
M20 137 164 172 206
M22 170 204 212 254
M24 198 238 247 296
M27 257 308 321 385
M30 314 377 393 472
M36 458 550 572 688
  • NOTE These minimum values are equal to 0 ,7 fub × As in accordance with EN 1 993 -1 -8.

BS EN 14399-9 Dimensions

Dimensions of direct tension indicators

Nominal size d (nominal thread diameter of associated bolt) Internal diameter External diameter Material thickness (excluding protrusions ) Height over protrusions (including protrusions ) Height of protrusions Protrusion tangential external diameter Protrusion tangential internal diameter
d1 d2 h1 h2 h3 d3 d4
min. max. min. max. min. max. min. max. min.
M12 12,75 12,85 26,0 32,5 2,5 5,5 0,8 20,0 13,85
M16 16,75 16,85 35,0 36,8 3,0 6,0 0,8 25,0 17,85
M20 20,95 21,05 41,0 46,0 3,5 6,5 0,8 29,0 22,05
M22 23,05 23,15 46,5 50,6 4,0 7,0 0,8 33,0 24,15
M24 25,15 25,25 50,0 55,2 4,0 7,0 0,8 38,0 26,25
M27 28,30 28,40 54,0 62,1 4,0 7,0 0,8 43,0 29,40
M30 31,45 31,55 59,0 69,0 4,0 7,0 0,8 46,5 32,55
M36 37,75 37,85 78,0 83,0 4,0 7,5 0,8 56,0 38,85

Support block dimensions

Nominal size d (nom inal thread diameter of associated bolt) Ca E F
min. max. min. min. max.
M12 1 0,5 11 3 23 2 3 ,5
M16 15 1 5 ,5 3 30 3 0,5
M20 19 1 9,5 3 34 3 4,5
M22 21 2 1 ,5 3 38 3 8,5
M24 23 2 3 ,5 3 43 43 ,5
M27 26 2 6,5 3 49 49,5
M30 29 2 9,5 3 5 3 ,5 54
M36 35 3 5 ,5 3 ,5 63 63 ,5
  • a Height of the cyl indrical boss = 2 ,16 mm ± 0 ,01 25 mm with no more than 0 ,005 mm difference in height between s ide “A” and “B ” .

Dimensions of nut face washers (HN)

Nominal size d (nominal thread diameter of associated bolt) Internal diameter External diameter Thickness
d1 d2 h
min . max. min . max. min . max.
M12 1 2 ,1 1 2 ,3 5 2 2 ,7 24 2 ,7 4,3
M16 1 6,1 1 6,3 5 2 7,7 29 3 ,7 4,3
M20 2 0,1 2 0,40 3 4,4 36 3 ,7 4,3
M22 2 2 ,3 2 2 ,60 3 7,4 39 3 ,7 4,3
M24 2 4,2 2 4,50 41 ,4 43 3 ,7 4,3
M27 2 7,2 2 7,55 46,4 48 4,4 5,6
M30 3 0,2 3 0,55 5 0,1 52 4,4 5,6
M36 3 6,2 3 6,5 5 60,1 62 5 ,4 6,6
  • NOTE The washers are intended to fit over the threaded portion of the shank only. In some cases the washer internal diameter, d1 , is less than the bo lt shank maximum diameter specified in EN 143 99-3 and EN 143 99-4.

Dimensions of Bolt face washers (HB)

Nominal size d (nominal thread diameter of associated bolt) Internal diameter External diameter Thickness Inside chamfer Outside chamfer
d1 d2 h c e
min max. min max. min max. min max. min max.
M12 13 13,27 23,48 24 2,7 3,3 1,6 1,9 0,50 1,0
M16 17 17,27 29,48 30 3,7 4,3 1,6 1,9 0,75 1,50
M20 21 21,33 36,38 37 3,7 4,3 2,0 2,5 0,75 1,50
M22 23 23,33 38,38 39 3,7 4,3 2,0 2,5 0,75 1,50
M24 25 25,33 43,38 44 3,7 4,3 2,0 2,5 0,75 1,50
M27 28 28,52 49 50 4,4 5,6 2,5 3,0 1,0 2,0
M30 31 31,62 54,80 56 4,4 5,6 2,5 3,0 1,0 2,0
M36 37 37,62 64,80 66 5,4 6,6 2,5 3,0 1,25 2,50

BS EN 14399-9 Thickness of the feeler gauge

Direct tension indicator positions Thickness of feeler gauge for H8 and H10
Under bolt head , when nut is turned 0 ,40
Under nut, when bolt is turned
Under nut, when nut is turned 0 ,2 5
Under bolt head , when bo lt is turned

BS EN 14399-9 Heat Treatment

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BS EN 14399-9 Bolting Surface Treatment Specifications

BS EN 14399-9 Bolting Components Marking

Product Shall be Marked with our manufacturing trade mark "TorqBolt" or "TB" along with the designated Grade.
Grade and manufacturer’s identification symbols shall be applied to one end of studs and to the heads of bolts and screws of all sizes. (If the available area is inadequate, the grade symbol may be marked on one end and the manufacturer’s identification symbol marked on the other end.) For bolts and screws smaller than 1⁄4 in. [6 mm] in diameter and studs smaller than 3⁄8 in. [10 mm] in diameter and for 1⁄4 in. [6 mm] in diameter studs requiring more than a total of three symbols, the marking shall be a matter of agreement between the purchaser and the manufacturer.

ASME Dimensional Standards

BS EN 14399-9 Bolting Certifications

  • EN 10204 3.1
  • EN 10204 3.2
  • PED 2014/68/EC
  • MERKBLATT AD 2000 W2/W7/W10
  • API 20 E BSL 1/ BSL 2
  • NACE MR 0175
  • NACE MR 0103

BS EN 14399-9 Testing Standards

ASME Threading Specifications

BS EN 14399-9 Supplementary Requirements