Frequently asked questions about the Bolts, nuts, shims category
What are bolts, nuts, washers?
Bolts, nuts, washers are fastening components: bolts join parts, nuts secure the bolt thread, and washers distribute load and protect surfaces. Used in construction and engineering; available in standard sizes and materials such as zinc and A4 (AISI316) for corrosion resistance.
What sizes of bolts, nuts, washers are available?
The category includes standard metric sizes, commonly M4–M20 and above, with types like DIN 933, DIN 934, DIN 9021 and DIN 7991. Size and length are shown in product titles (e.g. "8,0x50" = 8 mm diameter, 50 mm length).
What materials and coatings are used for bolts, nuts, washers?
You will find zinc-plated (ZN) items for corrosion protection and stainless steel A4/AISI316 parts for higher corrosion resistance. Material is indicated in product titles (ZN = zinc, A4/AISI316 = stainless steel).
What is the difference between DIN 933, DIN 934, DIN 9021 and DIN 7991?
DIN 933 is a hexagon bolt with full thread; DIN 934 is a hexagon nut; DIN 9021 is a large washer for load distribution; DIN 7991 is an internal hex countersunk screw. The DIN type in the product title defines shape and application.
How to choose between zinc-plated and A4 (AISI316) items?
Choose zinc-plated (ZN) for indoor or dry conditions and general corrosion protection. For aggressive environments, marine exposure, or long-term corrosion resistance, opt for stainless steel A4/AISI316.
What washer kits are available and why buy a 720-piece kit?
Washer kits include various common sizes for DIY and professional use; a 720-piece kit typically covers common sizes (M4–M12) and makes it easy to find the right washer on site. Kits save time and ensure required sizes are on hand.
Are NOVIPRO bolts and nuts suitable for construction and machine fastenings?
Yes. The category includes NOVIPRO bolts and nuts to DIN standards (e.g. DIN 933, DIN 934) in ZN and A4 versions, suitable for construction and mechanical fastenings when the required strength class and material are chosen.
What do A4, ZN, 8.8 markings in the product title mean?
A4 (AISI316) = stainless steel with high corrosion resistance; ZN = zinc coating; 8.8 = bolt strength class (high-strength steel). These markings help choose correct material and strength for the application.
Are countersunk and internal hex bolts available in the category?
Yes. The range includes internal hex bolts such as DIN 7991 and countersunk variants from NOVIPRO, used when a flush-mounted head is required.
Which washers should be used with hex bolts to distribute load?
Use large washers per DIN 9021 (e.g. NOVIPRO DIN9021) to evenly distribute load and protect surfaces. Match the washer inner diameter to the bolt size (e.g. M8 bolt uses a washer with M8 hole).