Description
Reviews
| Brand | - |
| Category | Industrial Small Parts / Connectors and Fasteners |
| Origin | - |
| Material | Alloy Steel |
| Strength Class | Grade 12.9 |
| Thread Size Options | M3, M4, M5, M6, M8, M10, M12 |
| Head Type | Cylindrical Head |
| Surface Treatment | Black Oxide Coating |
| Drive Style | Hex Socket (Allen) |
| Compliance Standard | DIN 912 / ISO 4762 |
| Thread Coverage | Fully Threaded |
| Hardness Range | 39-44 HRC |
| Country of Origin | Imported |
Anonymous
Mar 31, 2026
Rating: 5/5
Great for automotive use
Used on engine components where high tensile strength is required. Held up well under heat and vibration.
Anonymous
Mar 27, 2026
Rating: 4/5
Good but packaging could be better
Bolts are great quality and meet specs, but some were loose in the bag upon arrival. Product itself is fine.
Anonymous
Mar 13, 2026
Rating: 5/5
High quality steel
Very strong bolts. Used them on my bike frame assembly. No issues with stretching or breaking.
Anonymous
Mar 12, 2026
Rating: 5/5
Exact specifications
Measured them with calipers, they are true to metric specs. Will buy again for future projects.
Anonymous
Feb 10, 2026
Rating: 5/5
Perfect for machinery repair
Used these for a CNC machine repair. Fit perfectly and didn't strip under high torque. Very satisfied with the quality.
Q: What key size do I need for the M6 screws?
A: For M6 Grade 12.9 hex socket cap screws, you typically need a 5mm Allen key.
Q: Can I use these on aluminum parts?
A: Yes, but we recommend using an anti-seize compound to prevent galling between the steel and aluminum.
Q: Are these corrosion resistant for outdoor use?
A: They have a black oxide coating which offers mild corrosion resistance. For harsh outdoor environments, we recommend stainless steel.
Q: Do you sell matching nuts for these bolts?
A: Yes, please search for Grade 12.9 hex nuts in our store to find the matching hardware.
Q: What is the minimum tensile strength?
A: Grade 12.9 fasteners have a minimum tensile strength of 1220 MPa.
Marie's Paper Blending Stumps Thickened Xuan Paper Blending Stumps Marie's Student Sketch Set Blending Stumps Rubbing Cotton Painting Special Paper Blending Stumps Smudging Pens Art Supplies Xuan Paper Sketch Fixative
$5.09
Inner Mongolia Milk Skin Processing Equipment - Condensed Milk and Butter Production Line, Fully Automatic Cheese Making Machine
$13,580.00
Yijiayi Plastic Surgery - Hair Follicle Analysis to Assess Growth, Prevent Hair Loss, and Plan Transplants
$10.00
Hell Training Rock Guitar by Shinichi Kobayashi - Electric Guitar Speed Playing Tutorial
$106.00
Mai Da Chu Commercial Food Warmer Cabinet, Large-Capacity Constant-Temperature Heating Cart for Banquets, Hotels, and Kitchens
$8,165.00
Children's Activity Appliance Storage Box - Case for Braces, Underbite Correctors, Expanders, and Denture Cleaning
$16.80
Stainless Steel Cable Raceway Arc-Shaped Anti-Step Floor Metal Surface Mount Decorative Invisible Wire Channel
$2.50
Electric Watercolor Spray Pen Children Hand-painted Color Pa
$46.55
408 Fast-Drying Glue - Strong Low-Whitening Instant Adhesive for Metal and Plastic, Heat Resistant
$53.12
UE5.1-5.7 Ancient Sci-Fi Gate Model Instrument Consultation
$2.00
Biliansheng Hair Transplant - Non-Shave Female Hairline Restoration & Density Enhancement
$19,999.00
Water Brush Pen Set Large Capacity Beginner Gouache Solid Watercolor Paint Brush Tools Line Drawing Art Student
$32.00
Beginner Watercolor Painting Line Art Coloring Book, Hua Meng Lv Ren by Stan, Fine Texture, 2-Pack Free Shipping
$10.60
New Wanli Tire 265/45R21 SU306+ - Compatible with AITO M7, BYD Tang, Range Rover, Li Auto, and NIO
$528.00
Suzhou Factory Wholesale Chain Store Logo - RGB Illuminated Letters, Acrylic Neon Signs for Window and Counter Display
$1,911.00
RoHS 1.0 Environmental Tester for Alloy Analysis and Heavy Metal Detection in Plastic Toys
$15.30
Mont Marte Long-Handle Bristle Brush – Professional Art Brush for Acrylics, Oil Painting, and Flat Wash Techniques
$37,500.00
Portable Plastic Backpack Fertilizer Bucket for Manual Fruit Picking, Seed Feeding, and PPC Fertilization
$9.50
Chinese-Style Hand-Drawn Plant Line Art Coloring Book on 100% Cotton Watercolor Paper
$15.80
Eagle Brand 99021 Industrial Scouring Pads, Cleaning Cloths, and Polishing Pads Supply
$666.00
Pad Printing Machine Parts - Zhongke 4-Inch Blade Clamp, Blade Holder, and Doctor Blade Frame (In Stock)
$4.50
Pneumatic Throttle Valve Quick Connect Fitting SL4-01/4-02/4-03 Air Pressure Regulator Flow Control Valve
$8.60
Pad Printing Silicone Rubber Heads Electric Long Round Square Durable Customizable 30-Year Established Store
$3.00
Specialized Vegetable Growing Box - Foam Balcony Planter, Rectangular Plastic Pot for Home Gardening
$41.70
Candy Naoko Gujima Mr. Saxophone City Pop Sheet Music with Accompaniment Demo
$37.00
Multi-Color Detachable Water Bucket Stand - Office Purified Water Dispenser Holder (Inverted)
$60.95
Oil-Based Original Strong Fast-Drying Adhesive for Metal, Plastic, Rubber, Ceramics, and Wood, Multi-Purpose Transparent Glue (Not 502)
$21.60
Jay Chou - Feng BROTHER_CHAO Piano Accompaniment Sheet Music
$50.00
Toplip Automatic Retractable Air Hose Reel, Water Drum, High-Pressure Foam Drum for Pneumatic Tools and Auto Repair
$118.00
500L Yogurt Production Line - Stand-Up Pouch Filling Machine with Complete Dairy Processing Equipment and Fermentation Tank
$13,720.00
![[M2-M20] Stainless Steel Spring Washer](https://www.gosteppe.com/cache/medium/product/16306/legacy-main-ef3d2dba3bde669d48e6cca2.webp)
