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DIN 909 Specification

Hexagon Head Pipe Plug

DIN 909 Scope

DIN 909 Specification specifies the requirements for screw plugs for closing holes cylindrical internal thread according to DIN 158-1, DIN 3858, DIN EN ISO 228-1 and DIN ISO 261.
NOTE 1: Depending on the medium, pressure, temperature and material combination, there is no guarantee of tightness. Therefore, depending on the intended use, a suitable sealant is used. This is especially true for Sealing of holes with internal threads according to DIN ISO 261.
NOTE 2: Screw plugs for gas and drinking water installations are in DVGW G 600 and in the technical rules for drinking water installations TRWI according to DIN 1988-200 specified.
NOTE 3: Locking screws according to this standard are not designed for tensile and compressive loads.

DIN 909 Related Standards

DIN 906 DIN 908 DIN 910 DIN 7604

DIN 909 Dimensions

Locking screw with hexagon socket

Locking screw with hexagon socket
Locking screw with hexagon socket

    Key :
  • a Central elevation 0.25 mm for d 18 mm.
  • b Cylindrical attachment or radius 0.8 mm permitted.
  • c Production-related chamfer of the thread maximum 1.5P (P thread pitch).
  • d The rotated version has a center point with a maximum diameter of 0.33 dB permitted.
  • e Depression due to press technology is permitted.
  • f A cone due to press technology is permissible.
Thread kw min. b js16 dB +IT17 0 e lt js16 sa t 0-1 Massb
(ρ = 7,85 kg/dm3)
kg/1000 units ≈
Metric tapered male
thread according to DIN 158		 Whitworth thread
according to DIN 3858		 DIN 475-1 min. DIN ISO 272 min. DIN 475-1 DIN ISO 272 Tolerance class
DIN 909 M10 x 1 - DIN 909 R1/8 2.5 8 - - 7.66 12.5 - 7 h13 - 5.72
DIN 909 M12 x 1.5 - - 2.8 10 - - 7.66 15 - 7 - 9.1
- - DIN 909 R1/4 2.8 10 - 9.76 8.63 15 9 8c h14 - 12
DIN 909 M14 x 1.5 - - 2.8 10 - 9.76 8.63 15 9 8c - 13.2
DIN 909 M16 x 1.5 - - 3.5 10 - - 10.89 16 - 10 - 17.9
- - DIN 909 R3/8 3.5 10 - - 10.89 16 - 10 - 19.4
DIN 909 M18 x 1.5 - - 3.5 10 - - 10.89 16 - 10 - 21.9
DIN 909 M20 x 1.5 - - 4.2 10 12 - 14.2 17 - 13 6 25
- - DIN 909 R1/2 4.2 10 12 - 14.2 17 - 13 6 27.2
DIN 909 M22 x 1.5 - - 4.2 10 14 - 14.2 17 - 13 6 29
DIN 909 M24 x 1.5 - - 4.8 12 16 18.72 17.59 20 17 16c 7 43.8
(DIN 906 M26 x 1.5) - - 4.8 12 16 18.72 17.59 20 17 16c 7 50.9
- DIN 909 M27 x 2 DIN 909 R3/4 4.8 12 16 18.72 17.59 20 17 16c 7 51.8
DIN 909 M30 x 1.5 DIN 909 M30 x 2 - 6.2 12 20 20.88 19.85 22 19 18c 7 69.4
- DIN 909 M33 x 2 DIN 909 R1 6.2 12 23 20.88 19.85 22 19 18c 7 76.2
DIN 909 M36 x 1.5 DIN 909 M36 x 2 - 7.6 15 26 - 26.17 27 - 24 h15 10 118
(DIN 906 M38 x 1.5) - - 7.6 15 28 - 26.17 27 - 24 10 125
- DIN 909 M39 x 2 - 7.6 15 28 - 26.17 27 - 24 10 130
DIN 909 M42 x 1.5 DIN 909 M42 x 2 DIN 909 R1 1/4 7.6 18 32 - 26.17 30 - 24 13 151
DIN 909 M45 x 1.5 DIN 909 M45 x 2 - 7.6 18 35 - 26.17 30 - 24 13 163
DIN 909 M48 x 1.5 DIN 909 M48 x 2 DIN 909 R1 1/2 9.5 20 38 - 32.95 35 - 30 15 230
DIN 909 M52 x 1.5 DIN 909 M52 x 2 - 9.5 20 42 - 32.95 35 - 30 15 249
- DIN 909 M56 x 2 - 9.5 22 46 - 32.95 37 - 30 17 275
- DIN 909 M60 x 2 - 9.5 22 50 - 32.95 37 - 30 17 296
  • a The products with key widths according to DIN ISO 272 should preferably be used, see designation example.
  • b Weights slightly different depending on the key size.
  • c For spanner sizes 8, 16 and 18, the spanner size must be indicated in the designation to avoid confusion.

DIN 909 Technical Delivery Conditions

Material Steel Stainless steel Non-ferrous metals
General requirements DIN ISO 8992
Thread DIN 158-1: Short version / DIN 3858:
Tolerance class 2 (short version)
Chemical composition Materialsb Free cutting steel without
lead additives. Cold extrusion steel		 A1 to A5 AL1 to AL6 CU1 to CU7
Standards DIN EN 10277, DIN EN 10263-2 DIN EN ISO 3506-1 DIN EN 28839b
Grenzabmafle, Formund Lagetoleranzen Product grade B
Standards DIN EN ISO 4759-1, DIN 267-2
Surface finish coating As manufactured (without coating) Phosphate coatings,
as specified in DIN EN ISO 9717 Galvanic surface protection,
as specified in DIN EN ISO 4042 Non-electrolytically applied zinc flake coatings,
as specified in DIN EN ISO 10683		 clean and metallic bright as manufactured (without Coating)
Surface condition For the limit values of surface defects,
‰ fl applies accordingly
DIN EN 26157-3.
Acceptance inspection Acceptance test as defined in DIN EN ISO 3269