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DIN 908 Specification

Hexagon Socket Screw Plug

DIN 908 Scope

DIN 908 Specification specifies dimensions, masses and technical delivery conditions for screw plugs which are intended to be screwed into holes with parallel thread as specified in DIN 13-5, DIN 13-6 or DIN 13-7, and DIN EN ISO 228-1.
NOTE 1 : Since tightness is a function of pressure, temperature, the materials involved and the fluid with which the threaded parts are in contact, such connections cannot be assumed to be tight. Therefore, depending on the particular application, a sealant or seal ring as in DIN 7603 is provided.
NOTE 2 : Screw plugs complying with this standard are not designed to withstand specific tensile loads or pressure loads

DIN 908 Related Standards

DIN 906 DIN 909 DIN 910 DIN 7604

DIN 908 Dimensions

Screw plug dimensions (Standard type)

Hexagon socket screw plug (ISK)
Hexagon socket screw plug (ISK)

    Key :
  • type A stud end as in DIN 3852-1 and DIN 3852-2
  • permanent magnet (PM)
    • NOTE : Screw plugs can be supplied with an integrated permanent magnet (PM). Dimensions and details of design and placement of the magnet are at the manufacturer's discretion.
  • a form of socket base at manufacturer's discretion
  • b centric elevation of ≤ 0,25 mm for d ≤ 24 mm and ≤ 0,5 mm for d > 24 mm permitted
  • c hexagon socket may be slightly rounded or countersunk to 1,2smax
  • d dg ≤ (1,15smax) + 0,5 mm (applies to turned parts only)
  • e maximum prebore diameter for turned parts with 1,025smax
  • f permissible projection
  • g any chamfer provided on screw thread for manufacturing reasons shall be not more than 1,5P (P = pitch)
Thread k +0,5
0		 dk h14 i ±0,2 lt ≈ Hexagon socket Hexalobular socket as
in DIN EN ISO 10664		 12 point socket as in DIN 34824 Massa
(ρ = 7,85 kg/dm3)
kg/1 000 units
Metric fine
pitch thread		 Pipe as DIN
EN ISO 228-1		 eb min. s t1 min. No. t2 min. Nominal size t3 min. w1 min.
Nominal size min. c max. c
DIN 908
M10 x 1		 - DIN 908
G1/8A		 3 14 8 11 5,723 5 5,020 5,095 5,0 30 2,5 N6 2,5 3 6,3
DIN 908
M12 x 1,5		 - - 3 17 12 15 6,863 6 6,020 6,140 7,0 40 2,7 N8 2,9 3 11,3
- - DIN 908
G1/4A		 3 18 12 15 6,863 6 6,020 6,140 7,0 40 2,7 N8 2,9 3 14,6
DIN 908
M14 x 1,5		 - - 3 19 12 15 6,863 6 6,020 6,140 7,0 45 2,9 N8 2,9 3 16,0
DIN 908
M16 x 1,5		 - - 3 21 12 15 9,149 8 8,025 8,175 7,5 50 3,7 N10 3,7 3 19,0
- - DIN 908
G3/8A		 3 22 12 15 9,149 8 8,025 8,175 7,5 50 3,7 N10 3,7 3 21,4
DIN 908
M18 x 1,5		 - - 4 23 12 16 9,149 8 8,025 8,175 7,5 50 3,7 N10 3,7 3 28,3
DIN 908
M20 x 1,5		 - - 4 25 14 18 11,429 10 10,025 10,175 7,5 55 4,6 N12 4,6 4 37,5
- - DIN 908
G1/2A		 4 26 14 18 11,429 10 10,025 10,175 7,5 55 4,6 N12 4,6 4 40,8
DIN 908
M22 x 1,5		 - - 4 27 14 18 11,429 10 10,025 10,175 7,5 55 5,4 N14 5,4 4 47,5
DIN 908
M24 x 1,5		 - - 4 29 14 18 13,716 12 12,032 12,212 7,5 60 6,4 N16 6,4 4 53,5
DIN 908
M26 x 1,5		 - - 4 31 16 20 13,716 12 12,032 12,212 9,0 60 6,4 N16 6,4 4 68,7
- DIN 908
M27 x 2		 DIN 908
G3/4A		 4 32 16 20 13,716 12 12,032 12,212 9,0 60 6,4 N16 6,4 4 73,5
DIN 908
M30 x 1,5		 DIN 908
M30 x 2		 - 4 36 16 20 19,437 17 17,050 17,230 9,0 80 7,3 N18 7,3 4 84,0
- DIN 908
M33 x 2		 DIN 908
G1A		 5 39 16 21 19,437 17 17,050 17,230 9,0 80 7,3 N18 7,3 4 111
DIN 908
M36 x 1,5		 DIN 908
M36 x 2		 - 5 42 16 21 21,734 19 19,065 19,275 10,5 - - - - 4 134
DIN 908
M38 x 1,5		 - DIN 908
G11/8A		 5 44 16 21 21,734 19 19,065 19,275 10,5 - - - - 4 149
- DIN 908
M39 x 2		 - 5 46 16 21 21,734 19 19,065 19,275 10,5 - - - - 4 163
DIN 908
M42 x 1,5		 DIN 908
M42 x 2		 DIN 908
G11/4A		 5 49 16 21 25,154 22 22,065 22,275 10,5 - - - - 4 187
DIN 908
M45 x 1,5		 DIN 908
M45 x 2		 - 5 52 16 21 25,154 22 22,065 22,275 10,5 - - - - 4 215
DIN 908
M48 x 1,5		 DIN 908
M48 x 2		 DIN 908
G11/2A		 5 55 16 21 27,434 24 24,065 24,275 10,5 - - - - 4 246
DIN 908
M52 x 1,5		 DIN 908
M52 x 2		 - 5 60 16 21 27,434 24 24,065 24,275 10,5 - - - - 4 302
- - DIN 908
G13/4A		 5 62 20 25 36,571 32 32,080 32,330 14,0 - - - - 4 320
  DIN 908
M56 x 2		 - 5 64 20 25 36,571 32 32,080 32,330 14,0 - - - - 4 386
- DIN 908
M60 x 2		 DIN 908
G 2 A		 5 68 20 25 36,571 32 32,080 32,330 14,0 - - - - 4 445
- DIN 908
M64 x 2		 - 5 72 20 25 36,571 32 32,080 32,330 14,0 - - - - 4 530
  • The values deviate slightly for hexalobular sockets and 12 point sockets.
  • emin = 1,14s min
  • Tolerance as in DIN EN ISO 4759-1, product grade A
Screw plug with Hexalobular socket (ISR) as in DIN EN ISO 10664
Screw plug with Hexalobular socket (ISR) as in DIN EN ISO 10664

    Key :
  • Type A stud end as in DIN 3852-1 and DIN 3852-2
  • permanent magnet (PM)
    • NOTE : Screw plugs can be supplied with an integrated permanent magnet (PM). Dimensions and details of design and placement of the magnet are at the manufacturer's discretion.
  • a form of socket base at manufacturer's discretion
  • b centric elevation of ≤ 0,25 mm for d ≤ 24 mm and ≤ 0,5 mm for d > 24 mm permitted
  • c hexalobular socket (ISR) may be slightly rounded or countersunk to 1,1A
  • d dg ≤ A + 0,5 mm (applies to turned parts only)
  • e maximum prebore diameter for turned parts with 1,15B
  • f permissible projection
  • g any chamfer provided on screw thread for manufacturing reasons shall be not more than 1,5P (P = pitch)
Screw plug with 12 point socket (IVZ) as in DIN 34824
Screw plug with 12 point socket (IVZ) as in DIN 34824

    Key :
  • type A stud end as in DIN 3852-1 and DIN 3852-2
  • permanent magnet (PM)
    • NOTE : Screw plugs can be supplied with an integrated permanent magnet (PM). Dimensions and details of design and placement of the magnet are at the manufacturer's discretion.
  • a form of socket base at manufacturer's discretion
  • b centric elevation of ≤ 0,25 mm for d ≤ 24 mm and ≤ 0,5 mm for d > 24 mm permitted
  • c dg ≤ d1 max + 0,5 mm (applies to turned parts only); with d1 max as in DIN 34824
  • d permissible projection
  • e any chamfer provided on screw thread for manufacturing reasons shall be not more than 1,5P (P = pitch)

Screw plug dimensions (Type L, light-duty)

Screw plug with hexagon socket (ISK)
Screw plug with hexagon socket (ISK)

    Key :
  • Type A stud end as in DIN 3852-1 and DIN 3852-2
  • a form of socket base at manufacturer's discretion
  • b bottom shape and underhead fillet at manufacturer's discretion (with radius ≥ 0,5 mm)
  • c hexagon socket may be slightly rounded or countersunk to 1,2smax
  • d maximum prebore diameter for turned parts with 1,025smax
  • e any chamfer provided on screw thread for manufacturing reasons shall be not more than 1,5P (P = pitch)
Thread k +0,5
0		 dk h14 dB +IT18 i ±0,2 lt ≈ t5 min. t6 min. Hexagon socket Hexalobular
socket as in
DIN EN ISO 10664		 12 point socket as in DIN 34824 w2 +1,4 0 Massa (ρ = 7,85 kg/dm3)
kg/1 000 units ≈
Metric fine
pitch thread		 Pipe as DIN EN
ISO 228-1		 eb min. s t4 min. No. t7 min. Nominal size t8 min.
Nominal size min. c max. c
DIN 908
M10 x 1		 - DIN 908
G 1/8. A		 3 14 4,8 8 11 2 3 5,723 5 5,020 5,140 3,65 30 2,5 N6 2,5 1,8 5,5
DIN 908
M12 x 1,5		 - - 3 17 5,8 12 15 4 5 6,863 6 6,020 6,140 4,35 40 2,7 N8 2,9 2,0 9,6
- - DIN 908
G1/4A		 3 18 6,5 12 15 4 5 6,863 6 6,020 6,140 4,35 40 2,7 N8 2,9 2,0 12,4
DIN 908
M14 x 1,5		 - - 3 19 7,0 12 15 4 5 6,863 6 6,020 6,140 4,35 45 2,9 N8 2,9 2,0 13,6
DIN 908
M16 x 1,5		 - - 3 21 8,5 12 15 4 5 9,149 8 8,025 8,175 4,85 50 3,7 N10 3,7 2,0 16,2
- - DIN 908
G3/8A		 3 22 9,2 12 15 4 5 9,149 8 8,025 8,175 4,85 50 3,7 N10 3,7 2,0 18,2
DIN 908
M18 x 1,5		 - - 4 23 10,0 12 16 4 5 9,149 8 8,025 8,175 4,85 50 3,7 N10 3,7 2,0 24,0
DIN 908
M20 x 1,5		 - - 4 25 11,1 14 18 4 4 11,429 10 10,025 10,175 5,15 55 4,6 N12 4,6 2,0 31,9
- - DIN 908
G1/2A		 4 26 11,5 14 18 4 4 11,429 10 10,025 10,175 5,15 55 4,6 N12 4,6 2,0 34,7
DIN 908
M22 x 1,5		 - - 4 27 12,6 14 18 4 5 11,429 10 10,025 10,175 6,32 55 5,4 N14 5,4 2,0 40,3
DIN 908
M24 x 1,5		 - - 4 29 14,8 14 18 4 4 13,716 12 12,032 12,212 6,32 60 5,8 N16 5,8 2,0 45,5
DIN 908
M26 x 1,5		 - - 4 31 16,8 16 20 5 5 13,716 12 12,032 12,212 6,32 60 5,8 N16 5,8 2,0 58,4
DIN 908
M27 x 2		 - DIN 908
G3/4A		 4 32 17,8 16 20 5 5 13,716 12 12,032 12,212 6,32 60 5,8 N16 5,8 2,0 62,5
DIN 908
M30 x 1,5		 DIN 908
M30 x 2		 - 4 36 20,2 16 20 6 6 19,437 17 17,050 17,230 6,32 80 6,2 N18 6,2 2,0 71,5
- DIN 908
M33 2		 DIN 908
G1A		 5 39 22,2 16 21 7 7 19,437 17 17,050 17,230 7,32 80 6,2 N18 6,2 2,0 94,5
  • The values deviate slightly for hexalobular sockets and 12 point sockets.
  • emin = 1,14s min
  • Tolerance as in DIN EN ISO 4759-1, product grade A
Screw plug with Hexalobular socket (ISR) as in DIN EN ISO 10664, type L (light-duty)
Screw plug with Hexalobular socket (ISR) as in DIN EN ISO 10664

    Key :
  • Type A stud end as in DIN 3852-1 and DIN 3852-2
  • a form of socket base at manufacturer's discretion
  • b bottom shape and underhead fillet at manufacturer's discretion (with radius ≥ 0,5 mm)
  • c hexalobular socket (ISR) may be slightly rounded or countersunk to 1,1A
  • d maximum prebore diameter for turned parts with 1,15B
  • e any chamfer provided on screw thread for manufacturing reasons shall be not more than 1,5P (P = pitch)
Screw plug with 12 point socket (IVZ) as in DIN 34824
Screw plug with 12 point socket (IVZ) as in DIN 34824

    Key :
  • Type A stud end as in DIN 3852-1 and DIN 3852-2
  • a form of socket base at manufacturer's discretion
  • b bottom shape and underhead fillet at manufacturer's discretion (with radius ≥ 0,5 mm)
  • c any chamfer provided on screw thread for manufacturing reasons shall be not more than 1,5P (P = pitch)

DIN 908 Technical delivery conditions

Material Steel Stainless steel Nonferrous metals
General requirements DIN ISO 8992
Thread DIN ISO 965-1: tolerance class 6ga/
DIN EN ISO 228-1: tolerance class A
Chemical composition Materials b Free-machining 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 28839c
Limit deviations,
geometrical tolerances		 Product grade B
Standards DIN EN ISO 4759-1,
DIN 267-2
Stud ends Typed A
Standards DIN 3852-1 and DIN 3852-2
Surface finish - Coating As processed (without coating) Phosphate coatings as specified in
DIN EN ISO 9717 Electroplating as specified in DIN EN ISO 4042
Non-electrolytically applied zinc flake coatings
as specified in DIN EN ISO 10683		 Clean and metallically bright As processed (without coating)
Surface discontinuities DIN EN 26157-3 applies by analogy to limits for surface discontinuities
Acceptance inspection Acceptance inspection as specified in DIN EN ISO 3269
  • a Depending on the surface finish, another tolerance position prior to the application of the coating may be specified, see the relevant standards on coating systems.
  • b Other materials shall be subject to agreement
  • c Includes references to standards in which the relevant chemical composition is specified.
  • d Where screw plugs with type B or type C stud end are required, ordering shall be in accordance with the designation example.