High Hardness Special Screw Black Oxide Torx T7 Screws With Heat Treatment
Product Overview
Engineered for the most demanding industrial applications, our High Hardness Black Oxide Torx T7 Screws deliver unmatched strength, corrosion resistance, and torque performance. Combining advanced heat treatment processes with a precision Torx T7 drive, these screws are designed to withstand extreme stress, vibration, and harsh environments. Ideal for aerospace, automotive, and heavy machinery, they ensure reliable fastening where failure is not an option.
Key Features
✅ Ultra-High Hardness
Heat-treated alloy steel (HRC 38–45) provides exceptional tensile strength (up to 1,800 MPa) and resistance to wear, deformation, and shear forces.
✅ Black Oxide Coating
A matte black oxide finish enhances corrosion resistance, reduces friction, and adds a sleek, non-reflective appearance for critical applications.
✅ Torx T7 Drive
Tamper-resistant Torx T7 (6-lobe star) drive maximizes torque transfer, minimizes cam-out, and ensures secure tool engagement.
✅ Precision Heat Treatment
Quenched and tempered to refine grain structure, optimizing hardness-to-toughness balance for dynamic load resistance.
✅ Vibration & Loosening Resistance
Thread-locking grooves and precision threading prevent loosening in high-vibration environments like engines or rotating machinery.
✅ Global Compliance
ROHS, REACH, and ISO 9001 certified, ensuring safety and environmental responsibility.
Technical Specifications
- Material: Alloy Steel (Grade 10.9/12.9)
- Finish: Black Oxide (Standard), Optional Zinc-Nickel or Dacromet
- Drive Type: Torx T7 (TR15 Security Drive Available)
- Thread Pitch: Fine or Coarse (Customizable)
- Diameter: M3–M12 (Metric) or #4–½" (Imperial)
- Length: 6mm–100mm (Custom Lengths Available)
- Temperature Range: -40°F to 600°F (-40°C to 316°C)
- Certifications: ASTM A574, ISO 898-1, DIN 7984
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More Detail Informations
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Available Material
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1.Stainless Steel: SS303, SS304, SS316, SS410, SS420;
2.Carbon steel: C1006,C1010,C1018,C1022,C1035K,C1045; 3.Brass: C3602,C3604,Hpb59,Hpb62,Hpb65,Hpb58,Hpb70 ; 4.Aluminum: Al6061, Al6063 etc or as your requirements |
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Head type
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CSK Head,Pan Head,Truss Head,Hexagon Head,Round Head,Oval Head,Button Head,Cap Head,Cheese Head,etc.
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Hardness
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Carbon Steel:HRC:28~35 ,HV450~700
Alloy Steel:HRC:32~39(grade10.9) HRC:39~44(grade12.9) |
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Finish
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Zinc plated, Nickel plated, Bronze, Copper,Phosphate, Oxidation black, Passivation, Tin, Dacromet, Gold, Chrome, Silver,
Phosphorization,Zinc-nickel alloy plated etc. |
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Sample Available
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The sample is free of charge if we have the existing tooling,you only need to pay for the freight cost
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Delivery time
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Samples time 3-5 working days, Lead time 20-25 working days
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Pricing Term
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EXW Dongguan(FCA),FOB, CIF, CNF, DDU,etc.
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Packing
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Bulk in PE bag or Small boxes.then in carton .pallet
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Payment term
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TT (30% in advance as deposit, balance before delivery) , L/C, Western Union,PayPal etc
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Management system
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ISO9001:2015
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Certificate
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ISO,ROHS
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A1: Our main products are Electronic screws,Sems screws,Tapping screws,Chicago screws,Shoulder screws etc. Special Non-standard studs,Turning parts and High-end precision complex CNC Machining parts etc.
A2: Carbon Steel, Alloy Steel, Aluminum alloy,Stainless Steel, Brass, Copper ,Titanium alloy or according to your requirement.
A: We usually offer you a quotation within 12 hours, and the special offer is not more than 24 hours.Any urgent cases, please contact us directly by phone or send email to us.
A: If the weight of goods more than 80kg,Normally we use shipment to transprot the orders. It is about 20-30days . If the weight of goods less than 80kg,or there are urgent, we can send the goods via air express,It is 3~5 days.
Q4: What's your packing?What to do in case of damaged goods during transport?
A1: Our Normal packing is bulking in Cartons, less than 20 kgs/carton, 48 cartons / pallet. We also can pack products according to your requirement.
A2: To avoid any subsequent trouble regarding quality issue, we suggest you check the goods once you receive them. If there is any transport damaged or quality issue, don't forget take the detail pictures and contact us as soon as possible, we will properly handle it to make sure your loss to reduce to the smallest.
A: Yes, for big order, frequent customers, we give reasonable discounts.
A: Our production equipment is a new imported equipment. We have a group of skilled workers who have been working for more than 10 years. Their production experience is very rich and their skills are very skilled. The screws can be 30 million pcs/month. We have sufficient funds to ensure the normal operation of the factory.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.