mankk 400PCS Metric Grade 10.9 Flange Bolts and Nuts Kit - Engine

In this review the mankk 400PCS metric flange bolt kit is evaluated as a practical, value-focused fastener assortment for mechanics and hobbyists. The kit's single biggest selling point is its material quality: the bolts are made from 10.9 grade alloy steel with a galvanized surface, which makes them suitable for demanding tasks including use inside engines where strength and corrosion resistance matter.

Key Features

• High grade material: 10.9 alloy steel construction delivers higher tensile strength than ordinary carbon bolts, useful for mechanical and automotive applications.
• Galvanized finish: Zinc plated surface improves corrosion resistance for parts that may see moisture or under-hood exposure.
• Two thread types: The kit includes both full thread and half thread flange bolts to meet different clamping and shear requirements.
• Comprehensive assortment: 400 pieces across 17 metric sizes cover M6x1.0, M8x1.25, M10x1.5 with lengths from 12mm to 45mm, so common jobs are covered without extra purchases.
• Organized storage: A handheld plastic box with movable dividers and labeled compartments makes transport and sorting straightforward on the bench or in the shop.
• Complete fastener sets: The kit pairs 100 flange screws with 100 nuts, 100 washers and 100 elastic sheets, giving matched components for assembly and replacements.

Who It's For

This kit is best for automotive DIYers, professional mechanics who need a portable assortment for repairs, and small shops that frequently replace common metric flange bolts. The material choice and thread variety make it especially useful for under-hood work and mechanical equipment where stronger fasteners are required.

It is less well suited for specialty fastener needs that demand stainless steel, custom thread pitches, or hardened grades beyond 10.9. If corrosion resistance in marine environments or specific OEM-specified finishes are required, buyers should look for grade or coating alternatives.

Pros & Cons

Pros

• Good value for money with 400 matched pieces including nuts, washers and elastic sheets.
• Strong 10.9 grade alloy steel bolts provide higher tensile capacity than standard bolts.
• Handy plastic box with dividers and labeled compartments keeps sizes organized and portable.
• Includes both full and half thread options for versatile assembly needs.

Cons

• Galvanized finish improves corrosion resistance but is not a substitute for stainless steel in highly corrosive environments.
• Assortment focuses on common metric sizes; rare or specialty sizes are not included.

Specifications

Brand	mankk
Pieces included	400 PCS (bolts, nuts, washers, elastic sheets)
Material	Grade 10.9 alloy steel
Finish	Galvanized surface
Thread types	Full thread and half thread
Metric sizes	M6x1.0, M8x1.25, M10x1.5 (lengths 12mm to 45mm)
Storage	Handheld plastic box with movable divider and labeled notes

Our Verdict

The mankk 400PCS metric flange bolt kit is a solid, cost-effective choice for automotive and mechanical repair where strong, reliable fasteners are required. With 10.9 grade alloy steel, both thread types, and an organized box of matched components, it offers excellent practical value for DIYers and small shops, while those needing stainless or specialty fasteners should consider alternate kits.

Frequently Asked Questions

Are these bolts suitable for engine use?
Yes, the 10.9 grade alloy steel construction and galvanized finish make them appropriate for many under-hood applications, though consult OEM specs for critical engine fasteners.

What sizes are included?
The kit covers metric flange bolts in M6x1.0, M8x1.25 and M10x1.5 across lengths from 12mm to 45mm across 17 sizes.

How is the kit organized?
Bolts, nuts, washers and elastic sheets come in a handheld plastic box with movable dividers and classified notes for easy sorting and transport.