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Ultra Strength 12.9 Alloy Steel Socket Cap Series

"These bolts are seriously strong. Exactly what I needed for my project."

Chandler ReichelVerified Purchase
4.9 out of 5 stars based on 7 reviews

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$59.94
$29.97
Save $29.97 (50%)

thread diamete:

m2 50pcs

Ultra Strength 129 Alloy Steel Socket Cap Series 5
Ultra Strength 129 Alloy Steel Socket Cap Series 5
Ultra Strength 129 Alloy Steel Socket Cap Series 5
Ultra Strength 129 Alloy Steel Socket Cap Series 5
Ultra Strength 129 Alloy Steel Socket Cap Series 5
Ultra Strength 129 Alloy Steel Socket Cap Series 5
Ultra Strength 129 Alloy Steel Socket Cap Series 5
Ultra Strength 129 Alloy Steel Socket Cap Series 5

length:

0.157 in

0.157 in
0.197 in
0.236 in
0.315 in
0.394 in
0.472 in
0.551 in
0.630 in
0.709 in
0.787 in
0.866 in
0.984 in
1.181 in
1.378 in
1.575 in
1.772 in
1.969 in
2.165 in
2.362 in
2.559 in
2.756 in
2.953 in
3.150 in
3.346 in
3.543 in
3.740 in
3.937 in
4.331 in
4.724 in
5.118 in
5.512 in
5.906 in

Quantity

1
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About this item

Reinforce your structural foundations with the Ultra Strength 12.9 Alloy Steel Socket Cap Series. This professional grade fastening solution is forged from specialized High Tensile Alloy Steel, providing the definitive structural interface for environments subject to extreme mechanical stress. Featuring a precision machined DIN912 Socket Cap Head, these bolts are specifically intended for engine block assembly, industrial heavy machinery, and structural automotive framing where standard fasteners fail to meet critical safety and load bearing thresholds.

Perfect For

  • Heavy Duty Mechanical Engineering: Specifically intended for high torque applications in industrial presses and transmission housings.

  • Performance Automotive Tuning: The professional choice for securing turbo manifolds, suspension components, and engine mounts.

  • Structural Frame Fabrication: Providing an elite high tensile anchor for heavy duty equipment and warehouse racking systems.

  • Aerospace Testing Rigs: Engineered to maintain structural integrity under severe vibration and harmonic resonance.

  • Precision Robotics & Automation: Utilized as a specialized primary fastener for high cycle robotic arms and CNC axis assemblies.

Why Choose This Product

  • Elite 12.9 Tensile Architecture: Utilizing quenched and tempered alloy steel specifically designed to offer the highest yield strength available in a standard metric fastener.

  • Precision DIN912 Cap Geometry: Featuring a deep internal hex drive specifically intended to provide maximum torque transfer and prevent tool slippage.

  • Advanced Blackened Quench Shield: Providing a specialized industrial coating specifically intended to offer secondary oxidation resistance and a sleek professional finish.

  • Comprehensive Long Reach Specification: Offering an expansive length range up to 150 mm specifically intended for deep well mounting and multi substrate fastening.

Performance and Specification Guide

FeatureSpecificationMaterial Construction
Product TypeHex Socket Head Cap BoltGrade 12.9 Ultra Tensile Steel
StandardDIN912 Metric ProfileHigh Strength Quenched Build
Drive StyleInternal Hex (Allen) DrivePrecision Machine Threading
ApplicationHigh Pressure & Load SecuringIndustrial Fatigue Resistance
Reviews |  4.9
7 ratings

Item Reviews  (7)

Shop Reviews  (576)

Questions 

08/02/2026

These bolts are seriously strong. Exactly what I needed for my project.
review image 1
C
Chandler Reichelflag
Verified Purchase

06/13/2026

These screws exceeded my expectations. The threading is clean, and they fit perfectly into my setup. I’ve used cheaper ones before, and these are clearly on another level.
review image 1
D
Dannie Zemlakflag
Verified Purchase

06/01/2026

These are exactly what you want in high-strength screws. They tighten smoothly and don’t feel like they’ll fail under stress. I’ll be ordering more sizes soon.
A
Amely Pfefferflag
Verified Purchase

07/24/2026

I used these to replace some worn-out bolts on my equipment, and the difference is noticeable. They feel much stronger and tighten down securely without any slipping. Definitely a solid choice.
review image 1
S
Saige Baileyflag
Verified Purchase

06/30/2026

Honestly, I didn’t expect to notice much difference, but these are way better than the generic screws I had. They feel premium and perform great under pressure.
R
Reggie Schummflag
Verified Purchase

05/31/2026

Great for anyone who needs reliable hardware. I used them in a tight space, and the socket head design made it easy to work with.
A
Antwon Millsflag
Verified Purchase

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