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440C high-carbon martensitic precision solid shaft, UNS S44004 / 1.4125, fully compliant with ASTM A276 bar manufacturing standard
Highest carbon grade in 400 series stainless steel with molybdenum additive, maximum hardening capacity up to HRC58–62 after quenching & tempering
Fully magnetic under all heat treatment states, excellent wear resistance far exceeding 410 / 420 / 431 martensitic grades
Moderate anti-rust performance against fresh water & weak corrosive atmosphere after hardening & polishing
Supplied in fully soft annealed blank state for easy CNC turning, boring, threading and precision grinding
Custom round shaft diameter, full length customization, all precision machining per customer CAD/PDF drawings
Premium raw stock for precision bearing spindles, measuring tools, medical instruments and high-wear mold core shafts
Product Overview
This series 440C martensitic precision solid shafts are produced by hot rolling and cold drawing forming process. The factory standard delivery state is fully spheroidized annealing soft blank, which eliminates carbide agglomeration and ensures stable CNC machinability. Customers can conduct custom quenching and low-temperature tempering to reach target high hardness for heavy wear service.
440C is the highest-carbon martensitic stainless steel, adding molybdenum element to improve hardenability and mild corrosion resistance. Compared with other martensitic grades (410/420/431), it achieves ultra-high hardness after heat treatment, making it the preferred material for precision wear-resistant rotary components. It is widely processed into bearing mandrels, measuring fixture shafts, surgical instrument spindles, mold ejector cores and high-load mechanical transmission shafts for bearing manufacturing, medical equipment, precision molds and general machinery industries.
Material Grade Characteristics – 440C (UNS S44004 / 1.4125)
We supply 440C precision solid shafts for bearing, medical, mold and precision machinery global industrial clients.
Quality Assurance
100% UT & Eddy Current dual inspection to detect rolling segregation and surface crack defects
Full batch tensile, yield & hardness mechanical testing per heat lot
High-precision micrometer to control diameter & straightness tolerance
Spectrometer full spectrum chemical composition analysis verification
Metallographic martensite & carbide microstructure inspection after heat treatment
Mill Test Certificate EN 10204 3.1 can be issued and delivered together with shipment documents before delivery.
Packing & Delivery
Packing
- Inner: Independent anti-rust plastic sleeve + waterproof film full wrap for surface scratch protection
- Outer: Reinforced fumigated wooden pallet with separation strips to avoid bending & collision damage
- Custom heavy-duty export packaging for extra long/large-diameter shafts available upon request
Lead Time
Normally 10 – 45 working days after receiving advance payment. Exact lead time depends on shaft diameter, length, order quantity and custom heat treatment/machining demands.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Distributor/Wholesaler
Year Established:
1998
Total Annual:
>1-2 billion
Employee Number:
>200+
Ecer Certification：
Verified Supplier
HengAn Weiye Steel Group (HA Group) is a leading Chinese supplier of special steel, alloy materials, and precision machining services, with nearly 30 years of industry experience. The company integrates material sourcing, manufacturing, processing, and international trade, providing one-stop solutio... HengAn Weiye Steel Group (HA Group) is a leading Chinese supplier of special steel, alloy materials, and precision machining services, with nearly 30 years of industry experience. The company integrates material sourcing, manufacturing, processing, and international trade, providing one-stop solutio...
