Button Head Socket Screws

ISO 7380-1 Standard & ISO 7380-2 Flanged Button Head Screws

Button Head Socket Screws combine a smooth low-profile rounded head with an internal hex drive and metric machine thread. VALTOR supplies ISO 7380-1 standard heads and ISO 7380-2 collar-style geometry for machinery, panels, brackets, automation equipment and OEM assemblies.

Product

Standards

ISO 7380-1 / ISO 7380-2

Head / Drive

Low Rounded Button Head / Internal Hex

Versions

Standard / Integral Collar

Size

M3–M16 Metric Coarse

Length

Approx. 5–100 mm

Materials

304 / 316 Stainless Steel, Carbon Steel & Alloy Steel to Applicable Requirement

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Product Overview

ISO 7380-1 specifies a hexagon socket button head screw with a compact rounded profile and smaller under-head bearing interface. ISO 7380-2 uses a similar low button head with an integral collar that increases the bearing diameter and distributes contact over a wider area.

Both versions use an internal hex socket and metric coarse thread across M3–M16. Selection should consider clearance, appearance, tool access, component material, hole diameter, bearing pressure and joint design. The ISO 7380-2 collar is functional rather than decorative, but it should not automatically be claimed to replace a separate washer in every assembly.

The low head profile and internal socket leave less material in the head section than a conventional full-height Socket Head Cap Screw. Applicable ISO 7380 products have reduced head loadability—approximately 80% of that represented by the threaded portion—and should not automatically replace ISO 4762 fasteners in highly loaded joints without engineering review.

Technical Specifications

ISO 7380-1

Hexagon Socket Button Head Screw; steel and stainless steel within applicable current scope

ISO 7380-2

Hexagon Socket Button Head Screw with integral collar; current official scope is steel

Stainless Collar-Style Supply

304 / 316 versions supplied to ISO 7380-2 dimensional geometry, customer drawing and verified material requirement—not assumed full ISO material compliance

Drive / Thread

Internal Hex Socket / Metric Coarse for standard families

Size Range

M3 / M4 / M5 / M6 / M8 / M10 / M12 / M16

Commercial Length

Approximately 5–100 mm depending on diameter, standard, material and thread length

Materials

304 Stainless Steel / 316 Stainless Steel / Carbon Steel / Alloy Steel to applicable specification

Key Dimensions

Thread diameter d, pitch P, under-head length L, head diameter dk, head height k, hex socket size s and socket depth t

ISO 7380-2 Additional Dimensions

Collar diameter dc and collar thickness c

Button Head Geometry, Collar Bearing & Reduced Loadability

Low-Profile Button Head

Smooth rounded geometry reduces projection and supports compact, visually clean machine assemblies.

ISO 7380-1 Bearing

Standard button head provides a smaller under-head bearing area suited to joints where that interface is sufficient.

ISO 7380-2 Collar

A thin integral flange increases bearing diameter and distributes surface pressure over a wider contact region.

Selection Inputs

Component material, surface hardness, hole diameter, bearing area, joint design, clearance and appearance.

Reduced Head Loadability

The low head and internal socket reduce head-section material. Applicable ISO 7380 head loadability is approximately 80% of that represented by the threaded portion; do not assume ISO 4762-equivalent capacity.

Hex Socket Engagement

Use the correct Allen-key size, full insertion and proper alignment to reduce socket rounding, slip, recess damage or difficult removal.

Button vs Socket Head Cap

Button Head: lower smooth profile and reduced loadability. Socket Head Cap: taller cylindrical head, deeper engagement and different mechanical capacity. Selection is joint-specific.

Material, Thread & Size Options

1304 Stainless Steel — General machinery, equipment, panels and corrosion-resistant assemblies; available under applicable ISO 7380-1 requirements.

2316 Stainless Steel — Suitable for compatible humid, coastal, outdoor and more corrosive industrial applications.

3Carbon / Alloy Steel — Used where machinery and mechanical property requirements call for specified steel and property classes.

4Size Range — M3–M16 with approximately 5–100 mm lengths; availability depends on diameter, standard, material and thread length.

Common Diameters

M3M4M5M6M8M10M12M16

Standard, Flanged & OEM Manufacturing

Standard & Collar Versions

Supply includes ISO 7380-1 standard geometry and ISO 7380-2 collar geometry. Stainless collar-style products are confirmed against dimensional and customer material requirements.

Custom Head & Thread

Head diameter and height, collar diameter and thickness, socket size and depth, Metric Coarse, Metric Fine, UNC and UNF may be reviewed. Geometry outside ISO 7380 is described as custom.

OEM Information

Provide ISO 7380-1 / ISO 7380-2 / custom, diameter, pitch, length, material, head and collar requirement, property specification, quantity, drawing or sample.

Packaging

Inner bags, small boxes, export cartons, pallets, customer labels, part numbers and authorized private-label packaging may be supported.

Socket, Head & Dimensional Quality Inspection

✓

Thread & Mating Fit

✓

Under-Head Length

✓

Button Head Profile

✓

Collar Geometry & Bearing

✓

Hex Socket Engagement

Inspection may cover thread diameter, pitch, profile, continuity and fit; length measured from the bearing surface; head diameter, height, radius, concentricity and defects; collar diameter, thickness, surface and concentricity; and socket size, depth, position, burrs and tool engagement. Material is verified against the purchase requirement. Functional checks may cover thread fit, head/collar seating and component fit without invented torque, tensile or clamp-load values. Documentation can include MTC, raw-material, dimensional, product, actually performed mechanical and third-party inspection reports.

Applications

Low-profile internal-hex fastening for machinery, automation and OEM equipment.

Button head socket screws fastening industrial machinery and equipment brackets

Machinery Covers & Guards

Compact fastening for serviceable covers, guards and equipment components.

Automation Equipment

Frames and mechanisms where internal hex drive and reduced head height are useful.

Industrial Panels & Brackets

Standard or collar versions selected by available bearing area and panel design.

Fixtures & Mechanical Assemblies

Compact machine-threaded fastening for brackets, fixtures and machinery components.

OEM Equipment Components

Standard or custom geometry matched to equipment head, collar, material and length requirements.

Frequently Asked Questions

What is the difference between ISO 7380-1 and ISO 7380-2?

ISO 7380-1 specifies a standard Hexagon Socket Button Head Screw, while ISO 7380-2 adds an integral collar for a larger bearing surface.

Why do ISO 7380 Button Head Screws have reduced loadability?

The low head and internal socket leave less head-section material than a conventional full-height Socket Head Cap Screw, so replacement in highly loaded joints requires engineering review.

What sizes can VALTOR supply?

The standard families cover M3–M16 metric coarse threads. VALTOR commonly supplies approximately 5–100 mm lengths depending on diameter, material and configuration.

Can ISO 7380-2 collar-style screws be supplied in 304 or 316 stainless steel?

Yes. Because the current ISO 7380-2:2022 scope officially specifies steel, stainless versions are confirmed against the required dimensional geometry, drawing and material specification rather than assuming full standard material compliance.

When should I choose a Button Head Screw with a collar?

Choose it when a larger integrated bearing surface benefits the joint. Selection should consider material, bearing pressure, hole geometry and joint design; the collar does not always eliminate a separate washer.