JX-21JG74, Steel Knurled thumb nuts&Threaded Through-Hole Knobs

Material: iron, aluminum, copper, stainless steel, nylon PA66, PTFE, etc.

Surface treatment: environmental protection white zinc, environmental protection black zinc, environmental protection color zinc, dacromet, anodic oxidation, tin, zinc-nickel alloy, etc.

Features and principles: convenient and fast operation, flexible use, easy disassembly, and wide application.Long shafts can thread through these knobs for mounting versatility. The knobs provide a secure grip to position, tighten, and hold fixtures, equipment, and machinery.

1. Steel knobs are more robust than iron. Those with a black-oxide finish have mild rust resistance.

Stainless steel knobs have excellent corrosion resistance, making them the best choice for harsh environments. They also have good chemical resistance.

2. Aluminum knobs have mild corrosion resistance, are lightweight, and are non-magnetic.

3. Brass knobs have good corrosion resistance and are non-magnetic.

4. Plastic knobs are a lightweight alternative to metal. They resist oil, grease, and solvents. Nylon has good wear resistance. Phenolic has good scratch resistance. Polypropylene has good impact resistance.

①, When L＜L ref., e=0, and the method of diameter ds is omitted

②, Material: 

a) Steel, strength class (material): St, standard DIN EN 10087, DIN EN 10277-3 (these two material standards have been replaced by DIN EN ISO 683-4)

b) Stainless steel, strength class (material): A1, A2 according to standard DIN EN ISO 3506-1

c) Non-ferrous metals, strength class (material): CU3 according to standard DIN EN 28839

Packing: Inner is Poly foam, out is carton. Then pallet. Carton size: 29*19*19.5CM and 23.5*17.5*8, CM and pallet size is: 215*100*90CM, or as your requirement.

Packaging & Delivery and Packaging Details

1. Shrink film+wooden box

2. Cardboard box+pallet

3. Color box

4. As per the customer's request