Which sizes and quantities can I get?

Thread sizes run from M4 up to M12, covering light assemblies through heavier machinery work. You can order packs from 2 up to 30 pieces depending on the job. Pick the size and count that matches your build.

Are these bolts okay for marine or outdoor use?

Yes. They're A2-70 / 304 stainless steel, which resists rust and mild chemicals well in damp or outdoor settings. The finish is passivated for added protection. That makes them a solid pick for marine and architectural projects.

Do I still need separate lock washers with these?

No. The serrated flange is built into the bolt head and acts as a self-locking washer. The teeth bite the surface to resist loosening from vibration, so there's nothing extra to add. That speeds up assembly on machinery and automotive work.

M4-M12 304 Stainless Steel Flange Head Bolts | A2-70 Grade with Serrated Washer | 2-30pcs Hex Cap Screw Set

Name: M4-M12 304 Stainless Steel Flange Head Bolts | A2-70 Grade with Serrated Washer | 2-30pcs Hex Cap Screw Set
Brand: Compel
SKU: FAST-00063
Price: 40.95 USD
Availability: InStock

Stock #:TBS-04937

SKU:FAST-00063

M4-M12 304 Stainless Steel Flange Head Bolts | A2-70 Grade with Serrated Washer | 2-30pcs Hex Cap Screw Set - Image 1

1 / 6

$40.95

Ships to United States · standard est. 10-20 business days

Free standard shipping on orders over $59 (under 2kg). Express available at checkout.

SizeSelect an option

Length20 optionsSelect an option

Quantity

M4-M12 304 Stainless Steel Flange Head Bolts | A2-70 Grade with Serrated Washer | 2-30pcs Hex Cap Screw Set

$40.95

Fast Shipping

Secure Payment

Easy Returns

Good to know

Questions about this product

Which sizes and quantities can I get?: Thread sizes run from M4 up to M12, covering light assemblies through heavier machinery work. You can order packs from 2 up to 30 pieces depending on the job. Pick the size and count that matches your build.
Are these bolts okay for marine or outdoor use?: Yes. They're A2-70 / 304 stainless steel, which resists rust and mild chemicals well in damp or outdoor settings. The finish is passivated for added protection. That makes them a solid pick for marine and architectural projects.
Do I still need separate lock washers with these?: No. The serrated flange is built into the bolt head and acts as a self-locking washer. The teeth bite the surface to resist loosening from vibration, so there's nothing extra to add. That speeds up assembly on machinery and automotive work.

Fasteners spec sheet (PDF)

Get a one-page sheet with full description, specifications, technical details, FAQs, price & SKU - handy to save, print, or share.

Not sure which one?

Compare fasteners

This product

Assortment of A2-70 304 stainless steel flange head bolts with serrated washers, in sizes from M4 to M12.

M4-M12 304 Stainless Steel Flange Head Bolts | A2-70 Grade with Serrated Washer | 2-30pcs Hex Cap Screw Set

Price$40.95

Rating4.9

Sold172+

Stock In stock

You're viewing this

Alternative

304 stainless steel hex socket button head screws and standoffs in metric sizes M2 through M8, featuring round flat head design for sleek fastener applications.

304 Stainless Steel Button Head Screws | Hex Socket M2-M8 | 10pc Standoff & Flat Head Bolts

Price$18.99

Rating4.9

Sold600+

Stock In stock

View

Alternative

304 stainless steel metric hex washer head bolt with serrated flange cap screw in M4 through M12 sizes.

Hex Washer Head Bolts | Serrated Flange Cap Screws | M4-M12 304 Stainless Steel

Price$16.95

Rating4.9

Sold2,000+

Stock In stock

View

Alternative

Zinc-plated carbon steel hexagon expansion screws in sizes M6 through M16 for built-in floor anchoring applications.

Heavy-Duty Floor Expansion Bolts | Zinc Plated Carbon Steel | M6 M8 M10 M12 M16 Hexagon Screws

Price$39.99

Rating4.8

Sold50+

Stock In stock

View

Compare options

More Fasteners

All Fasteners

Self Tapping Screws | 100pc Round Head Assortment | Carbon Steel

5.0(82)

$42.95

Insulated Standoff Kit | M2-M4 Hex Spacers | Screw Nut Washer Assortment

5.0

$44.99

50pc Plasterboard Fixings Kit | Heavy-Duty Self-Drilling | Gypsum Board Wall Plugs

5.0(66)

$16.99

Hex Socket Cap Screws | A2-70 304 Stainless Steel | M2 M3 M4 M5 M6 M8 Bolt Assortment

5.0

$16.99

Socket Insert Nuts | Zinc Alloy for Wood | M4-M10 Threaded Fastener Kit

5.0

$30.95

Bearing Screws | M3-M6 304 Stainless Steel Hex Socket Cap Bolts | 10pcs/lot High Tensile

5.0

$32.95

Shape Rivet Nuts | M4 M5 M6 Panel Fasteners | Metal Clamp Lock for Iron Sheet Plate

5.0

$24.99

220PCS Brass Heat Insert Nuts | M2-M6 Knurled Thread | Hot Melt Embedment Set

4.9

$39.99

Drywall Expansion Anchors | Self-Drilling Self-Tapping Screws | Plasterboard Fixing Fasteners

5.0

$27.95

M3-M10 Thumb Screws | Knurled Hand-Tighten Bolts | Curtain Wall & Glass Adjust

5.0

$17.99

100 Sets Black Plated Book Binding Screws | M5 Sizes 4-30mm | Chicago Screws & Snap Rivets

5.0

$39.99

Self-Tapping Screw Expansion Bolt Kit | For Hollow Walls, Tile & Drywall | 10-500 Set Pipe Plug Anchors

5.0

$34.99

Explore the range

Popular in Tools & Hardware

Browse Tools & Hardware

Digital Vernier Caliper | 0-150mm Measuring Tool | Plastic Body

4.9

$6.95

Desoldering Braid | Solder Remover Wick | 2.0mm & 3.5mm x 1.5M

4.9

$5.95

USB-C Endoscope Camera | 5.5mm Lens for Android & PC | Flexible Inspection Borescope with 6 LEDs

4.9

$10.99

Sander Sanding Discs | 125mm 8-Hole Pattern | For Wood & Metal Grinding

4.9(10.2K)

$3.49

Tool Set 4pc | Tile Grout & Sealant Remover | For Shower, Kitchen & Bathroom Cleaning

4.9

$17.99

1-Inch Rotary Tool Sanding Sheets | 100pc Disc Set | For Dremel Tools

4.9(2.7K)

$7.95

10pcs M35 Cobalt Drill Bits Set | For Stainless Steel & Metal | 1-3mm High-Speed Steel

4.9

$15.99

Nickel Strip for 18650 Battery Spot Welding | 10m x 0.15mm Roll | High-Conductivity Connector

4.9

$5.95

Powerful LED Head Torch | Motion Sensor & Rechargeable | COB High Power Fishing

4.9(5.2K)

$11.99

Polishing Compound | Nano Crystal Wax | Hydrophobic Scratch Repair

4.9(1.7K)

$7.95

-27%

Safety Work Shoes for Men | Anti-Impact & Puncture-Resistant | Professional-Grade Athletic Design

4.7

$60.99$83.73

Laser Level | 2-Line Green Cross-Line | 360° Self-Leveling for Horizontal & Vertical Alignment

4.7

$59.99

Complete the set

Accessories & add-ons

Diamond Drill Bit Set | 18-68mm Hole Saw for Tile, Glass & Stone

5.0

$26.95

Woodworking Spade Drill Bit Set | 10-55mm High-Carbon Steel | Durable Flat Wood Boring Tools

5.0

$12.99

Forstner Drill Bit Set | 14-100mm Self-Centering Wood Boring Kit | Carbide-Tipped Precision

5.0

$5.95

Diamond Core Drill Bit | M14 Thread for Granite, Marble & Tile | Dry Vacuum Brazed Masonry Hole Saw

5.0

$35.95

Table Saw Blade Guard | 4-10 Inch Acrylic Protection Cover for Woodworking Safety

5.0

$83.99

Sanding Belts | P60-P3000 Abrasive | 330x10mm, 457x13mm, 492x6mm

5.0(16)

$19.99

30x 9x533mm Sanding Belts | Aluminium Oxide Abrasive | P36-P600 Grit Assortment

5.0(21)

$38.95

-21%

Diamond Drill Bit Set | 6-Piece M14 Thread | For Porcelain, Granite & Marble

5.0

$95.99$121.65

Paint Spray Gun Kit | 1.3mm Nozzle & 600cc Cup | Easy to Use for Cars, Walls & Home Projects

5.0

$299.99

This premium stainless steel flange bolt kit offers superior corrosion resistance and a secure, vibration-proof fastening solution. The integrated serrated washer provides a permanent locking feature, eliminating the need for separate washers and ensuring a reliable, non-slip hold in demanding applications. Features and Benefits - A2-70/304 Stainless Steel Construction - Provides excellent resistance to rust and corrosion, ensuring long-term durability in harsh or outdoor environments. - Integrated Serrated Flange Washer - Creates a self-locking, vibration-resistant connection that prevents loosening under dynamic loads and stress. - Hexagon Head Design (GB5787) - Allows for high torque application with standard tools, ensuring a tight and secure fit every time. - Comprehensive Metric Sizing (M4-M12) - Offers versatility for a wide range of projects, from light-duty assemblies to heavy machinery and structural applications. Applications - Automotive and machinery assembly where vibration resistance is critical. - Marine, outdoor, or architectural projects requiring corrosion-resistant hardware. - General fabrication, repair, and maintenance tasks across industrial and DIY sectors.

Thread Size: M4, M5, M6, M8, M10, M12. Material: A2-70 / 304 Stainless Steel. Corrosion Resistance: Good (304 Stainless Steel). Head Type: Hexagon/Hex Head. Product Type: Flange Head Bolt with Serrated Washer. Quantity Range: 2-30 pieces. Standard: GB5787. Thread Pitch: Standard coarse pitch per ISO metric thread. Washer Type: Integrated Serrated Washer. Flange Diameter (M12 example): Approx. 28 mm. Hex Key Size (M12 example): 19 mm. Thread Sizes Available: M4, M5, M6, M8, M10, M12. Material Grade: A2-70 / 304 Stainless Steel. Quantity Range: 2 to 30 pieces. Standard: GB5787. Corrosion Resistance: Grade 304/A2 - Good atmospheric and mild chemical resistance. Hardness (A2-70): 210-300 HV. Head Type: Flange Hexagon Head (Hex Head). Proof Load (A2-70, M12): 57,500 N. Surface Finish: Natural mill finish, passivated. Tensile Strength (A2-70): 700 MPa minimum. Thread Type: Full Thread (Cap Screw). Washer Type: Integrated Serrated Washer. Yield Strength (A2-70): 450 MPa minimum. Q: What are the specifications of these flange head bolts? A: These are A2-70 grade 304 stainless steel flange head bolts with integrated serrated washers. They conform to the GB5787 standard and are available in sizes from M4 to M12, sold in quantities ranging from 2 to 30 pieces per pack.. Q: What is the quality of the stainless steel used in these bolts? A: The bolts are manufactured from grade 304 stainless steel, which offers excellent corrosion resistance and durability. The A2-70 marking indicates a tensile strength of 700 MPa, suitable for many general-purpose and outdoor applications.. Q: Are these bolts compatible with standard metric nuts and tools? A: Yes, these hex head flange bolts use standard metric thread pitches and hex sizes. The integrated serrated washer is designed to prevent loosening under vibration, and they can be installed with common metric hex wrenches or sockets.. Q: Is there any warranty on these fasteners? A: Warranty coverage varies by seller, but these industrial fasteners typically come with a guarantee against manufacturing defects. It's recommended to check the specific seller's policy regarding returns or replacements for faulty items.. Q: Do these bolts offer good value compared to buying components separately? A: These bolts provide excellent value as they combine the bolt and locking washer into a single component, saving assembly time. The 304 stainless steel construction offers long-term corrosion resistance, making them cost-effective for applications where durability is important..

M4-M12 304 Stainless Steel Flange Head Bolts | A2-70 Grade with Serrated Washer | 2-30pcs Hex Cap Screw Set

Questions about this product

Compare fasteners

More Fasteners

Self Tapping Screws | 100pc Round Head Assortment | Carbon Steel

Insulated Standoff Kit | M2-M4 Hex Spacers | Screw Nut Washer Assortment

50pc Plasterboard Fixings Kit | Heavy-Duty Self-Drilling | Gypsum Board Wall Plugs

Hex Socket Cap Screws | A2-70 304 Stainless Steel | M2 M3 M4 M5 M6 M8 Bolt Assortment

Socket Insert Nuts | Zinc Alloy for Wood | M4-M10 Threaded Fastener Kit

Bearing Screws | M3-M6 304 Stainless Steel Hex Socket Cap Bolts | 10pcs/lot High Tensile

Shape Rivet Nuts | M4 M5 M6 Panel Fasteners | Metal Clamp Lock for Iron Sheet Plate

220PCS Brass Heat Insert Nuts | M2-M6 Knurled Thread | Hot Melt Embedment Set

Drywall Expansion Anchors | Self-Drilling Self-Tapping Screws | Plasterboard Fixing Fasteners

M3-M10 Thumb Screws | Knurled Hand-Tighten Bolts | Curtain Wall & Glass Adjust

100 Sets Black Plated Book Binding Screws | M5 Sizes 4-30mm | Chicago Screws & Snap Rivets

Self-Tapping Screw Expansion Bolt Kit | For Hollow Walls, Tile & Drywall | 10-500 Set Pipe Plug Anchors

Popular in Tools & Hardware

Digital Vernier Caliper | 0-150mm Measuring Tool | Plastic Body

Desoldering Braid | Solder Remover Wick | 2.0mm & 3.5mm x 1.5M

USB-C Endoscope Camera | 5.5mm Lens for Android & PC | Flexible Inspection Borescope with 6 LEDs

Sander Sanding Discs | 125mm 8-Hole Pattern | For Wood & Metal Grinding

Tool Set 4pc | Tile Grout & Sealant Remover | For Shower, Kitchen & Bathroom Cleaning

1-Inch Rotary Tool Sanding Sheets | 100pc Disc Set | For Dremel Tools

10pcs M35 Cobalt Drill Bits Set | For Stainless Steel & Metal | 1-3mm High-Speed Steel

Nickel Strip for 18650 Battery Spot Welding | 10m x 0.15mm Roll | High-Conductivity Connector

Powerful LED Head Torch | Motion Sensor & Rechargeable | COB High Power Fishing

Polishing Compound | Nano Crystal Wax | Hydrophobic Scratch Repair

Safety Work Shoes for Men | Anti-Impact & Puncture-Resistant | Professional-Grade Athletic Design

Laser Level | 2-Line Green Cross-Line | 360° Self-Leveling for Horizontal & Vertical Alignment

Accessories & add-ons

Diamond Drill Bit Set | 18-68mm Hole Saw for Tile, Glass & Stone

Woodworking Spade Drill Bit Set | 10-55mm High-Carbon Steel | Durable Flat Wood Boring Tools

Forstner Drill Bit Set | 14-100mm Self-Centering Wood Boring Kit | Carbide-Tipped Precision

Diamond Core Drill Bit | M14 Thread for Granite, Marble & Tile | Dry Vacuum Brazed Masonry Hole Saw

Air Blow Gun | Heavy-Duty Pneumatic Tool for Engine & Workshop Cleaning

Diamond Drill Bit Set | 8-Piece for Tile, Glass & Stone | 6-45mm Hole Saws

TCT Trimming Router Bit | 1/2 Shank 3 Flute | For Plywood, MDF & Chipboard

Table Saw Blade Guard | 4-10 Inch Acrylic Protection Cover for Woodworking Safety

Sanding Belts | P60-P3000 Abrasive | 330x10mm, 457x13mm, 492x6mm

30x 9x533mm Sanding Belts | Aluminium Oxide Abrasive | P36-P600 Grit Assortment

Diamond Drill Bit Set | 6-Piece M14 Thread | For Porcelain, Granite & Marble

Paint Spray Gun Kit | 1.3mm Nozzle & 600cc Cup | Easy to Use for Cars, Walls & Home Projects