Unbrako Socket Products

Unbrako Allen Bolts

Unbrako allen bolts and socket products for drawings that specify Unbrako by name — supplied from Mumbai with same-day quotes.

Also calledUnbrako boltUnbrako screwUnbrako allen key boltUnbrako SHCSUnbrako socket screw

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Overview

About our unbrako allen bolts range

Unbrako is the original socket screw brand and is often specified by name in OEM drawings and maintenance manuals. Perfect Engineering Co supplies the Unbrako range — socket head cap screws, countersunk and button head screws, grub screws, hex bolts, nuts, washers and B7 studs — from our Mumbai stock.

Because we also stock TVS/Sundaram Fasteners and LPS, we can quote an Unbrako part alongside an equivalent TVS/Sundaram Fasteners part, so your purchase team sees both options in one quote.

Common sizes we supply: Unbrako allen bolts in M5, M6, M8, M10, M12, M16 and M20, plus inch sizes 1/4", 5/16", 3/8", 1/2" and 5/8".

Also known in the trade as: Unbrako bolt, Unbrako screw, Unbrako allen key bolt, Unbrako SHCS, Unbrako socket screw.

Makes / Suppliers

Available makes

UnbrakoPrimary make on this page

TVS/Sundaram FastenersEquivalent alternative

LPSEquivalent alternative

Specifications

Technical specifications

Products: Socket head cap screws · CSK & button head screws · Grub screws · Hex bolts & nuts · Washers · B7 studs
Grade: 12.9 (socket screws) · 8.8 / 10.9 (hex) · ASTM A193 B7 (studs)
Standards: DIN 912 · ISO 4762 · DIN 7991 · ISO 7380 · DIN 916 · ASTM A193 / A194
Diameter: Metric M3 – M36 · Inch 1/8" – 1-1/2"
Finish: Black oxide (standard) · Zinc plated · Zinc flake on request

Coatings & Finishes

Finishes available

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.

Zinc Flake (Geomet / Dacromet)

Non-electrolytic coating with high corrosion resistance and no hydrogen embrittlement — preferred for 10.9 & 12.9.

PTFE / Xylan Coated

Blue or green fluoropolymer coating for oil & gas and offshore studs.

Sizes

Unbrako range we supply

Product	Standard	Grade	Size Range
Socket Head Cap Screw (Allen Bolt)	DIN 912 / ISO 4762	12.9	M3 – M36
Countersunk Socket Screw	DIN 7991	10.9	M3 – M20
Button Head Socket Screw	ISO 7380	10.9	M3 – M16
Socket Set / Grub Screw	DIN 916	45H	M3 – M20
Hex Bolt / Screw	DIN 931 / 933	8.8, 10.9	M6 – M36
Stud Bolt with 2H Nuts	ASTM A193 B7 / A194 2H	B7	M10 – M36, 3/8" – 1-1/2"

FAQ

Common questions

Are these genuine Unbrako products?

Yes. We supply genuine Unbrako-marked products in original packaging.

Can you supply an equivalent to Unbrako?

Yes. TVS/Sundaram Fasteners and LPS make equivalent Grade 12.9 socket screws to the same DIN/ISO standards. We can quote both.