Choosing the right M8 x 1.25 x 30 bolts hinges on material strength, corrosion resistance, and fit in tight spaces. The selections below cover high-grade alloy steel and stainless options with full threads and squarely suited for outdoor or precision applications. Each product features a 1.25 mm thread pitch, 30 mm screw length, and an 8 mm shank diameter, with various head styles and finishes to match different project needs.
| Product | Material | Finish / Notes | Count |
|---|---|---|---|
| SVLING M8-1.25 x 30mm Bolt (304 SS) | 304 Stainless Steel | Full threads, Allen drive, with hex spanner | 25 pcs |
| iexcell M8 x 30mm Kit | Alloy Steel 12.9 | Black oxide, includes hex key | 10 pcs |
| MewuDecor M8-1.25 x 30mm (304 SS) | Stainless 304 | Bright finish, full thread | 20 pcs |
| SVLING M8-1.25 x 30mm Bolt (304 SS) | 304 Stainless Steel | Full threads, Allen drive, with hex spanner | 25 pcs |
| VGBUY M8-1.25 x 30 mm (304 SS) | 304 Stainless Steel | Black zinc plated, full thread | 25 pcs |
SVLING M8-1.25 x 30mm Bolt (304 SS) – 25Pcs
These 8 mm diameter, 30 mm long socket head cap screws use 304 stainless steel for robust rust resistance and durability in outdoor environments. The 12.9-grade alloy option is not used here; instead, this variant emphasizes corrosion resistance with a full-thread design that facilitates easy installation in tight spaces. The recessed Allen drive and hex socket head support high torque and reliable engagement, while burr-free threads ensure a smooth fit.
iexcell M8 x 30mm Kit – 10 Pcs (12.9 Alloy, Black Oxide)
This kit pairs 8 mm diameter, 30 mm long hex socket head cap screws with a black oxide finish on 12.9 grade alloy steel, delivering high strength and abrasion resistance. The set includes a hex key (6 mm) to drive the screws, making it convenient for field projects or repairs in constrained spaces. Overall length is 37.82 mm, and the head diameter is 13 mm with a 7.82 mm head height, supporting solid torque while minimizing protrusion.
MewuDecor M8-1.25 x 30mm (304 SS) – 20Pcs
Made from 304 stainless steel, these full-thread socket head cap screws are designed for durability and chemical resistance in challenging environments. The 8 mm thread diameter and 30 mm screw length align with standard M8 fasteners, while the 13 mm head diameter and 8 mm head height ensure a capable drive area for Allen keys. The bright finish offers a clean, corrosion-resistant appearance suitable for visible assemblies.
SVLING M8-1.25 x 30mm Bolt (304 SS) – 25Pcs
This variant uses 304 stainless steel for reliable corrosion resistance and durability across a range of environments. It features a DIN 912 compliant hex socket screw with a full thread, designed for higher torque transfer in tight spaces. The hex drive size is 6 mm, and the head height is 8 mm with a head diameter of 13 mm. The combination of stainless steel and full thread makes these bolts suitable for both indoor assemblies and exposed outdoor installations.
VGBUY M8-1.25 x 30 mm – 25Pcs (304 SS, Black Zinc)
These M8 bolts are made from 304 stainless steel and feature a black zinc plating for additional corrosion resistance and a stealthy appearance. They come in a full-thread design and include a hex spanner, enhancing torque handling and installation in tight places. The 6 mm hex drive and 13 mm head diameter provide a stable grip for standard Allen keys, while the black finish helps conceal hardware in certain aesthetic contexts.
MewuDecor M8-1.25 x 30mm Flanged Hex Head Bolts (304 SS) – 15Pcs
These DIN 6921 flange bolts use 304 stainless steel for corrosion resistance and include a flange beneath the head to distribute load, reducing the need for a separate washer. The 8 mm thread diameter and 30 mm length align with M8 standards, while the full-thread design ensures reliable engagement along the threaded portion. The plain finish provides a clean, professional look suitable for mechanical assemblies where a flange helps with load distribution and alignment.
Buying Guide: Key Purchase Considerations
- Material and corrosion resistance: Choose 304 stainless steel for outdoor or moisture-prone environments, or 12.9-grade alloy steel with black oxide for high strength in controlled settings. Stainless variants offer better long-term corrosion resistance, while alloy steel can provide higher hardness in non-corrosive environments.
- Finish and appearance: Black oxide and black zinc finishes reduce glare and blend with dark assemblies, but may offer less corrosion protection than bright stainless finishes. For visible hardware, bright finishes can look cleaner and resist discoloration.
- Head style and drive type: Socket head caps (Allen drive) are well-suited for tight spaces and high torque. Flanged heads distribute load and can eliminate the need for washers. Ensure the head height and diameter fit your clearances.
- Thread pitch and length: A 1.25 mm pitch is standard for M8 fasteners in many mechanical assemblies. Confirm the total length (including head) to ensure it clears components in assemblies, especially where space is tight.
- Included tools: Some sets include a hex key; others require standard Allen keys. Having the correct driver size (6 mm) helps prevent stripping and ensures consistent torque.
- Quantity and packaging: Consider whether you need bulk bolts for future projects. A 25-piece pack provides additional spares for ongoing maintenance or multiple assemblies.
- Application environment: Outdoor or humid environments favor stainless steel for corrosion resistance. Indoor or dry environments may tolerate alloy steel variants with protective finishes.
- Compatibility and standards: Align bolt dimensions with DIN 912/6921 standards and ensure thread length and head geometry match application needs.
- Quality and certification: For critical engineering applications, sourcing from reputable brands with standardized hardness, tensile strength, and finish specifications is advisable.