ISO 7380 · Low Profile

TVS/Sundaram Fasteners Button Head Socket Screws

Low-profile, domed-head socket screws to ISO 7380 — for guards, panels, enclosures and anywhere a smooth head is safer.

Also calledButton head allen boltButton head screwBHCSDome head allen screwRound head allen bolt

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Overview

About our button head screws range

Button head cap screws have a wide, rounded head that spreads load over thin sheet and leaves no sharp edges. We stock TVS/Sundaram Fasteners, Unbrako and LPS button head screws in special-grade alloy steel, fully threaded, plus stainless steel versions in SS 304 and SS 316.

Common sizes we supply: M4, M5, M6, M8 and M10 button head screws — for example M5 x 10, M6 x 12 and M8 x 16.

Also known in the trade as: Button head allen bolt, Button head screw, BHCS, Dome head allen screw, Round head allen bolt.

Makes / Suppliers

Available makes

TVS/Sundaram FastenersChennai · Genuine stock

UnbrakoPrecision socket products

LPSLakshmi Precision Screws, Rohtak

Local MakeEconomical everyday grade

Specifications

Technical specifications

Specification: Generally conforming to ISO 7380-1
Threads: 5g 6g as per ISO 261; ISO 965-2; ISO 965-3
Material: Special grade alloy steel · Stainless SS 304 / 316
Property Class: 12.9 / 10.9 as per ISO 898-1 · A2-70, A4-70
Thread Length: All sizes fully threaded
Standard Finish: Zinc phosphate (grey / black), SST life of 72 hours to red rust

Coatings & Finishes

Finishes available

Phosphate (Grey / Black)

Manganese or zinc phosphate base for oil retention and paint adhesion.

Black Oxide / Self Colour

Standard heat-treated finish with light oil. Default for high-tensile grades 8.8–12.9.

Zinc Plated – White / Clear

Bright silver electroplate for indoor corrosion protection.

Stainless Steel SS 304 (A2)

Natural finish; general corrosion resistance for food, pharma, and outdoor use.

Stainless Steel SS 316 (A4)

Molybdenum grade for marine, chemical, and coastal environments.

Sizes

Button head screw size chart (ISO 7380)

Size	Pitch (mm)	Head Dia (mm)	Head Height (mm)	Allen Key (mm)	Typical Lengths
M3	0.5	5.7	1.65	2	6 – 20 mm
M4	0.7	7.6	2.2	2.5	6 – 30 mm
M5	0.8	9.5	2.75	3	8 – 40 mm
M6	1.0	10.5	3.3	4	8 – 50 mm
M8	1.25	14	4.4	5	10 – 60 mm
M10	1.5	17.5	5.5	6	16 – 70 mm
M12	1.75	21	6.6	8	20 – 80 mm
M16	2.0	28	8.8	10	30 – 80 mm