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Bolt and nut protection caps schema
Bolt and nut protection caps
Acorn nut caps for bolts and nuts from M5 to M30 in Black, Grey, White, and Anthracite, available in sets of 5, 10, 25, 50, or 100 pieces. Made from high-quality, UV-resistant PE polyethylene, these caps are durable, weatherproof, and protect against corrosion. Designed with precision, they feature a hexagonal tab for a secure fit and a polished finish. Ideal for protecting bolts in construction, machinery, furniture, playgrounds, and garden architecture. Easy clip-on installation ensures a snug and reliable fit without tools.
  • Cover caps for nuts and bolts M5 to M30 - matching key size 8 to 46 - colour black (RAL 9005), grey (RAL 7040), white (RAL 9010), anthracite (RAL 7016). Further dimensions in the table and diagram.
  • MATERIAL AND QUALITY: All our EMFA® Nut Caps and plugs have 10-year guarantee, only in the original package. Hole caps are made of the high quality polyethylene PE which is resistant and durable to various weather conditions, UV radiation and deformation.
  • PERFECT DESIGN: Unique design with a click tab and thick core allows for permanent coverage of the hex nut bolt. The Nut covers have been designed with the utmost attention to detail, it forms a harmonious whole, giving the final product an aesthetic appearance.
  • SAFETY: The shape of the Caps for screws protect against injury. The nut and bolt cover protects the outstanding hexagonal nuts and bolts from the weather and protects to a large extent against corrosion and rust.
  • INSTALLATION AND USE: Very easy to install thanks to the hexagonal clip (click fastener). Nut covers have various applications in machinery and equipment construction, furniture manufacturing, playground equipment and garden architecture elements.
Material: PE (Polyethylene)
Colour: black (RAL 9005), grey (RAL 7040), white (RAL 9010), anthracite (RAL 7016)
Delivery time: check: delivery and payment
Amount: 5, 10, 25, 50, 100
Product number: SKS
Product number  Bolt/Nut Size  [SW] Outside Height [AH] Overall Height [TH] Height [AK] For spanner size
SKS 5 M5 7,9 mm 10,6 mm 9,5 mm 6,0 mm 8
SKS 6 M6 9,9 mm 13,2  mm 13,4 mm 7,3 mm 10
SKS 8 M8 12,9 mm 17,6 mm 16,5 mm 8,7 mm 13
SKS 10 M10 16,9 mm 21,6 mm 20,3 mm 10,1 mm 17
SKS 12 M12 18,9 mm 23,6 mm 21,9 mm 11,4 mm 19
SKS 14 M14 21,9 mm 27,4 mm 24,2 mm 12,5 mm 22
SKS 16 M16 23,9 mm 29,6 mm 27,2 mm 14,0 mm 24
SKS 18 M18 26,5 mm 33,3 mm 30,3 mm 17,4 mm 27
SKS 20 M20 29,0  mm 36,5 mm 33,3 mm 18,0 mm 30
SKS 22 M22 31,3 mm 38,9 mm 36,0 mm 20,0 mm 32
SKS 24 M24 34,5 mm 43,9 mm 39,3 mm 20,2 mm 36
SKS 30 M30 45,8 mm 56,0 mm 51,3 mm 24,8 mm 46
We send our products worldwide and the price is regular regardless the destination country. Check the table below to see in which delivery zone your country is and to check the delivery time for your order.
Letter (without tracking)
Warenpost (with shipment tracking)




Zone Countries Delivery time
Inland Germany 2 - 3 workdays
A Andorra,Austria, Belgium, Czech Republic, Denmark, Finland, France,Great Britain, Greece, Hungary,Iceland, Ireland,Italy, Liechtenstein,Lithuania, Luxembourg, Netherlands, Norway, Portugal, Scotland,Slovakia, Slovenia, Spain,Sweden, Switzerland 2 - 4 workdays
B Albania,Armenia, Australia, Bosnia and Herzegovina, Bulgaria,Canada, Croatia, Cyprus, Estonia,Georgia, Israel, Japan, Latvia,Macedonia,New Zealand,Romania, Serbia, Turkey, United States 3 - 7 workdays
C Afghanistan,Argentina,Azerbaijan, Bahrain,Bangladesh, Brazil, Burkina Faso,Cambodia,Cameroon, Egypt,India,Jordan, Kazakhstan, Kenya,Kuwait,Kyrgyzstan, Madagascar, Marocco, Nigeria,Oman, Pakistan,Saudia Arabia, South Africa, Qatar, Yemen, Tajikistan, Turkmenistan,UAE,Ukraine, Uzbekistan 6-12 workdays
D Columbia,Indonesia,Iran, Iraq,Mexico, Philippines,Russia, Singapore 8 - 18 workdays

You can cancel the contract by returning the item within one month. Before sending your goods, write us a message so we can send you a return form. The term begins with receipt of the goods. It is sufficient to return the return form or goods in a timely manner. Appeal should be addressed to:

EMFA GmbH
Im Technologiepark 1
15236 Frankfurt (Oder)




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