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Including type No’s:
S P M H *
SPMH Series Dual Certified Metallic Dome Head Stopping Plugs provide a method of filling unused entries in Ex equipment while maintaining Flameproof Exd and Increased Safety Exe methods of explosion protection and IP66, 68 for IEC type applications. Class I, Division 2 and NEMA 4X, 6P for NEC/CEC type applications.
SIRA00ATEX1094 I M2 II 2DG E Ex de IandIIC
SIRA00ATEX1094 II 2DG E Ex de IIC (Aluminium)

CSA / A Ex
Class I, Zone 1, Ex de IandIIC
Class I, Division 1and2 ABCD
Class II EFG, Class III

POCC GB MΠ14.B00030

IECEx Ex d IIC / Ex e II / Ex d I

IECEx SIR 05.0042U
IP66 68, CSA Enclosure Type (NEMA) 4X 6P
IMPACT RESISTANCE 20Nm (7Nm Aluminium)
OPERATING TEMPERATURES Nitrile ‘O’ Ring -30ºC to +100ºC
Silicone ‘O’ Ring -50ºC to +180ºC
Brass CZ121 (SPMH)
316 Stainless Steel (SPMHS)
Aluminium Alloy (SPMHA)
THREADS ISO Metric; NPT; NPS; ISO Pipe Thread (BSP Taper, BSP Parallel); PG
SEALS The standard ‘O’ Ring material is Nitrile
PLATING Zinc (ZP); Nickel (NP); Tin (TP); Electroless Nickel (EN)
SPMH - Stopping Plug type and body material (Brass)
NP - Nickel plating
M20 - Male thread size
Metric Dim Ref NPT Dim Ref ISO Pipe Dim Ref PG Dim Ref
M16 B 7 A
M20 C 1/2" D 1/2" D 9 B
M25 C 3/4" D 3/4" D 11 C
M32 C F D 13.5 C
M40 C 1*1/4" F 1*1/4" D 16 C
M50 C 1*1/2" F 1*1/2" D 21 C
M63 C F D 29 C
M75 C 2*1/2" G 2*1/2" D 36 C
M80 x 2.0 E G D 42 C
M85 x 2.0 E 3*1/2" G     48 C
M90 x 2.0 E G    
M100 x 2.0 E
Dimension Reference A B C D E F G
Head Diameter Minimum 6.0mm larger than the major thread diameter
Hex Socket A/F 6.0 8.0 10.0 10.0 10.0 10.0 10.0
Total Length 21.5 21.5 21.5 24.5 25.5 29.0 39.0
Thread Length 16.0 16.0 16.0 19.0 22.0 23.5 33.5
All Dimensions are in Millimetres
  • SPMH type stopping plugs are designed for use within either clearance holes or parallel threaded entries, for taper threaded entries we would recommend the use of SPA type stopping plugs
  • Full installation instructions are supplied with stopping plugs, the instructions must be read prior to installation and adhered to in full
  • Unless otherwise stated ISO Metric entry threads have a 1.5mm pitch
  • For Flameproof Exd applications the female thread into which the stopping plug is to be fitted must comply with clause 5.3 of EN 50018:2000 (clause 5.3 IEC 79-1)
  • For NEC/CEC Explosion Proof applications an engagement of at least 8 full threads must be achieved for parallel threads and 5 full threads must be achieved for tapered threads
  • Where metallic stopping plugs are fitted into non-metallic Increased Safety Exe enclosures they must be included within the earth circuit of the system
  • When ordering one needs to specify if IECEx or ATEX certification is required. ATEX versions are supplied as standard.


Peppers America, Inc
875 Via De La Paz, Suite D
Pacific Palisades, CA 90272
Part of the North American Sales Company