To order Military Spec O-rings, use the NSN or the AS568 number including dash size and proper Military prefix such as AN, AS, MS or NAS.

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ASTM D2000 Material Designation
(type Class)

Butyl, SBR, Natural rubber

AK Polysulphide
BA Butyl, Ethylene Propylene
BC Neoprene® (Chloroprene)
BE Neoprene® (Chloroprene)
BF Nitrile
BG Nitrile, Urethanes
BK Nitrile
CA Ethylene Propylene
CE Hypalon®
CH Nitrile, Hydrin®
DA Ethylene Propylene
DF Polyacrylate
DH Polyacrylate, HNBR
EE Vamac® (Ethylene Acrylic)
EH Polyacrylate
FE Silicone
FK Fluorosilicone
GE Silicone
HK Viton® (Fluoroelastomers)
KK Perfluoroelastomers
ASTM D2000 Suffix

Heat Resistance                         

B Compression Set                        
C Ozone or Weather Resistance    
EA Fluid Resistance (Aqueous)       
EF Fluid Resistance (Fuels)             
EO Fluid Resistance (Oils and Lubricants) 
F Low Temperature Resistance
G Tear Resistance
J Abrasion Resistance
M Flammability Resistance
P Staining Resistance
Z Special Requirements
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