Ntsia Hlau & chim rau Roj Hmab Tshuab
khoom Nthuav dav
Diameter of screw: φ15-φ500
L/D ratio: 15-55
Hardness after hardening and tempering: HB280-320
Nitriding hardness: 950-1100HV
Nitrided layer depth: 0.5-0.8mm
Nitrided brittleness: Less than grade 2
Surface roughness: Ra0.4
Linearity of screw: 0.015mm/m
Bimetallic layer depth: ≥3mm
Bimetallic hardness: HRC60-72
Hard-chrome plating hardness after nitriding: ≥950HV
Chrome-plating layer depth: 0.025~0.10mm
High-quality alloy steel
38CrMoAlA (JIS SACM645)
42CrMo (AISI 4140)
Hard chrome plating
Alloy powder spray welding
Five Steps to place an order:
Step 1. Inquiry.
Send us diameter and length(or L/D) of screw, outer diameter of barrel.
If you have drawing or draft, please send us! That will save a lot of your time!
Step 2. Quotation & Contract
Our manager will send you a quotation.
After confirming the quotation by you, we will send you invoice and contract for payment.
Step 3. Drawing
Our specialist will design drawings and send you for confirming.
Drawings are made by Auto CAD.
Step 4. Production
Production time from 18 to 30 days, depend on complexity of screw and barrel.
Step 5. Inspection & Delivery
After production we will check the hardness and sizes, send you photoes of screw and barrel.
With rich experiences in shipment we can offer the best delivery plan for you.