Carbon & Alloy Steel Fasteners

Product Overview

Suzhou Fusort Machinery Technology Co., Ltd. specializes in the scaled custom manufacturing of carbon and alloy steel fasteners, covering hex bolts, socket head screws, shaft pins, and washers. Materials include Q235, #45 carbon steel, 40Cr, and Grade 8.8, 10.9, and 12.9 alloy structural steel — meeting requirements from general-purpose fastening to high-strength load-bearing connections.

Materials & Strength Grades

• Q235: General carbon structural steel, cost-controlled, suited to standard structural connections
• #45 Steel: Medium-carbon steel that delivers excellent mechanical properties after quenching and tempering, widely used in general machinery
• 40Cr: Alloy structural steel with good hardenability, suited to high-load transmission and fastening components
• Grade 8.8/10.9/12.9: High-strength bolts used in critical automotive chassis, engine, and engineering-machinery connections

We apply advanced heat treatment and surface finishing processes — blackening, Dacromet coating, zinc plating, and phosphating — to ensure consistent strength, toughness, and corrosion resistance.

Quality & Production Capability

All products are ISO 9001 certified, with automotive component lines also operating to IATF 16949 standards. Tolerances are held to within ±0.01mm, and first-article pass rates exceed 99.8%.

Customization & Services

Whether for new-energy vehicle chassis fastening, engineering machinery structural connections, or general machinery assembly, Fusort provides a one-stop solution from sampling and certification through to mass-production delivery, with non-standard customization available based on customer drawings. Send us your drawings for a quotation.

Frequently Asked Questions

Q1: What strength grades of carbon/alloy steel fasteners does Fusort manufacture? A: Fusort custom-manufactures high-strength alloy steel bolts in Grade 8.8, 10.9, and 12.9, in materials including Q235, #45 steel, and 40Cr, suited to automotive chassis, engine, and engineering-machinery applications requiring high connection strength.

Q2: What's the difference between carbon steel and alloy steel fasteners? A: Carbon steel fasteners (e.g., Q235, #45 steel) are lower cost and suited to general structural connections. Alloy steel fasteners (e.g., 40Cr and Grade 8.8-12.9) contain added alloying elements and undergo heat treatment for significantly higher strength and hardenability, making them suited to high-load, high-strength connections such as automotive chassis and engineering-machinery components.

Q3: Can your products meet automotive industry quality system requirements? A: Yes. Fusort's automotive component production lines operate to IATF 16949 standards in addition to ISO 9001 Certification across the facility, with first-article pass rates exceeding 99.8% and tolerances held to within ±0.01mm.

Q4: What surface treatment options are available? A: Fusort offers blackening, Dacromet coating, zinc plating, and phosphating, matched to customer requirements for corrosion resistance, appearance, and operating environment.

Q5: Do you support non-standard customization? Is there a high minimum order quantity? A: Yes. Fusort can produce non-standard parts based on customer drawings, from low-volume sampling through to full mass production. Send your drawings or sample parts for a quotation and process plan.

Q6: What are your lead times and tolerance control levels? A: Tolerances are held to within ±0.01mm, with first-article pass rates exceeding 99.8%. Specific lead times depend on part specifications, surface treatment, and order volume — we provide a detailed production schedule promptly after receiving your drawings.