A2 Stainless Steel Socket Cap Screws DIN 912 Allen Key Bolts Hex Socket Head Cap Screw M4 to M16

A2 Stainless Steel Socket Cap Screws DIN 912 Allen Key Bolts Hex Socket Head Cap Screw M4 to M16 Description

A2 stainless steel Allen socket cap screws to DIN 912 (equivalent to ISO 4762 / UNI 5931), with a hexagon socket drive and a narrow head profile suited to tight or hard-to-reach fixing points. The socket (Allen) head sits neatly in a counterbore or recess rather than protruding like a standard hex bolt head, which is why socket cap screws are the usual choice wherever a flush or near-flush finish matters, or where a spanner can't get a clean swing at a protruding head. The hexagon socket also gives a positive, secure fit for the driving tool, which helps when a fixing needs to be driven or removed at higher torque without rounding off the head.

A2 stainless offers good general corrosion resistance and is more cost-effective than A4 (316) stainless, making it a common choice where full marine-grade resistance isn't required - including food and beverage industry equipment, where A2 is widely accepted. Driving requires a correctly sized hex/Allen key matched to the screw diameter - most standard toolkits already cover the common sizes in this range. Several of the longer sizes are partially threaded rather than fully threaded, leaving a smooth shank section near the head for a cleaner bearing surface in clamped joints; a black-oxide finish is also available in M1070mm alongside the standard stainless finish.

Key Features

• A2 (304-grade) stainless steel construction for good general corrosion resistance at a more cost-effective price than A4 (316) stainless
• Manufactured to DIN 912, equivalent to ISO 4762 / UNI 5931, so dimensions and thread engagement match other screws made to the same standard
• Hexagon socket (Allen key) drive, giving a strong, rounding-resistant fit for tools and secure driving even at higher torque
• Low-profile cap head designed to seat flush or near-flush in a counterbore, keeping the fixing out of the way where a raised bolt head can't be tolerated
• Full range from M4 up to M16, with multiple lengths per diameter spanning 6mm to 100mm
• Partial-thread option on several longer lengths, leaving a smooth unthreaded shank for a cleaner bearing surface when clamping material together
• A2 grade is widely accepted in food and beverage industry equipment as well as general workshop and outdoor use
• Black-oxide finish available as an alternative to bright stainless in the M1070mm size

Specification

• Material: A2 stainless steel · Standards: DIN 912 / ISO 4762 / UNI 5931
• Head: Hexagon socket cap, Allen key drive
• Thread: Full or partial (marked per size), right-hand

The list below shows every diameter and the lengths available, so you can match the exact screw to your fixing:

• Diameter M4 - Available Lengths: 8, 20, 25, 30, 35mm
• Diameter M5 - Available Lengths: 6, 8, 10, 12, 16, 20, 30, 40, 50mm
• Diameter M6 - Available Lengths: 10, 12, 16, 20, 25, 30, 45, 50, 60, 80mm
• Diameter M8 - Available Lengths: 10, 12, 16, 20, 25, 30, 35, 50mm (partial thread), 60, 70, 80mm
• Diameter M10 - Available Lengths: 16, 25, 30, 40, 50mm (partial thread), 60mm (partial thread), 70mm (black-oxide finish), 80, 100mm
• Diameter M12 - Available Lengths: 30mm
• Diameter M16 - Available Lengths: 60, 80mm

Typical Applications

• Machinery and equipment assembly and repair - the flush-fitting Allen head suits access panels, guards and moving assemblies where a projecting hex bolt head could snag, foul moving parts, or simply get in the way.
• Automotive maintenance and modification - A2 stainless resists everyday road grime and moisture better than plain or zinc-plated steel, and the socket drive tolerates the higher torque often needed when working on vehicles.
• Marine and outdoor structures - a cost-effective, corrosion-resistant fixing for exposed frames, fittings and outdoor furniture where full A4 marine-grade resistance isn't essential.
• Construction and structural steel connections - the wide diameter range (M4-M16) and long lengths up to 100mm cover everything from light fixtures to heavier structural steelwork.
• Furniture assembly - the neat, recessed head keeps joints tidy on visible furniture components where a standard bolt head would look and feel out of place.
• Food and beverage industry equipment - A2 stainless is a widely accepted material choice for fixings on this type of equipment, in line with the corrosion-resistance and hygiene expectations of that setting.

Installation Guidance

• Use a correctly sized hex/Allen key matched to the screw diameter - most standard toolkits already cover the common sizes in this range.
• Where a flush finish is required, drill or machine a counterbore sized to the screw head diameter so the head sits at or below the surrounding surface.
• For the partially threaded lengths (M850mm, M1050mm and M1060mm), position the screw so the smooth, unthreaded shank spans the clamped material - this lets the shank bear the clamping load cleanly rather than the thread, giving a more consistent joint.
• The M1070mm black-oxide option gives a darker, non-reflective finish where a bright stainless sheen isn't wanted, while retaining the same DIN 912 dimensions as the standard stainless finish.