The development of door hardware accessories is closely related to the evolution of the door and the way of opening the door, the reason of the revolution of the door hardware is from consciousness of door function and convenience to use the door. The accurate description of the development history of door hardware requires a lot of work, here we only rational suppose the development procedure of the door hardware which is driven by the demand of mankind. when the use of glass by humans has not yet been universal, door is used for lighting and for the people at a distance or watch the outside world. Door Hardware,Zinc Die Casting Door Handle,Zinc Die Casting Door Knob,Zinc Die Casting Door Hinge NINGBO ZHENHAI BOLANG METAL PRODUCT FACTORY , https://www.aldiecastings.com
Specification:
Diameter: Φ 45mm-Φ 200mm
L/D ratio: 16-35
The compression ratio of screws can be designed according to different products and ingredients
Base Materials:
(1)38CrMoAlA(JIS SACM645)
(2)42CrMo(AISI 4140)
(3)4Cr5MoSi V1 (JIS SKD-61)
(4)9Cr18MOV
(5)HPT
Bimetallic alloy materials:
1)Fe-based alloy
2)Ni-based alloy/Deloro alloy
3)Co-based alloy
4)NiCo-based alloy
5)Tungsten carbide/Wolfram carbide
Technics:
Heat treatment
High-frequency quenching
Nitriding treatment
Hard-chrome electroplating
Bimetallic alloy welding
Bimetallic alloy centrifugal casting
Technical parameter:
Nitrided layer depth: 0.5-0.8mm
Nitrided hardness: 900-1000HV
Nitrided brittleness: Less than grade 1
Surface roughness: Ra0.4
Linearity of screw: 0.015mm
Hard-chrome plating hardness after nitriding: ≥ 950HV
Chrome-plating layer depth: 0.025-0.085mm
Bimetallic layer depth: 3mm
Production time: 35 days
Warranty and service: 1 year
Focus on quality and service.
Experienced manufacturer, we will be the best choice.