DIN 916 · 913 · 914 · 915

Allen Grub Screws (Socket Set Screws)

Headless hex socket set screws for locking pulleys, gears, collars and knobs onto shafts — cup, flat, cone and dog point, in alloy steel and stainless.

Also calledGrub screwAllen grub screwSet screwSocket set screwHeadless screw

WhatsApp for price View Price → View on IndiaMART ↗

Overview

About our grub screws range

Grub screws (also called allen grub screws or socket set screws) have no head — they are fully threaded with a hex socket at one end and a point at the other. Tightened through a threaded hole, the point presses against a shaft to stop a pulley, gear, collar or coupling from slipping. Because they sit flush or below the surface, they are ideal where a protruding head is not acceptable.

We stock grub screws in alloy steel grade 45H (black) and stainless steel A2 / A4, from M3 to M24, in all four common point types. Cup point (DIN 916) is the general-purpose choice; flat point (DIN 913) suits frequent adjustment and hardened shafts; cone point (DIN 914) gives the strongest hold in a pre-drilled spot; dog point (DIN 915) locates in a hole or groove.

Common sizes we supply: M4, M5, M6, M8, M10 and M12 grub screws — for example M6 x 8, M8 x 10, M10 x 12 and M12 x 16 — in grade 45H black and SS.

Also known in the trade as: Grub screw, Allen grub screw, Set screw, Socket set screw, Headless screw, Cup point grub screw.

Makes / Suppliers

Available makes

TVS/Sundaram FastenersChennai · Genuine stock

UnbrakoPrecision socket products

LPSLakshmi Precision Screws, Rohtak

Local MakeEconomical everyday grade

Specifications

Technical specifications

Point Types: Cup point DIN 916 · Flat point DIN 913 · Cone point DIN 914 · Dog point DIN 915
ISO Equivalents: ISO 4029 · ISO 4026 · ISO 4027 · ISO 4028
Material: Alloy steel · Stainless steel SS 304 / 316
Grade: 45H · A2, A4
Diameter: Metric M3 – M24 · Inch 1/8" – 3/4"
Length: 3 mm – 60 mm

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.

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

Grub screw size chart (DIN 916)

Size	Pitch (mm)	Allen Key (mm)	Typical Lengths
M3	0.5	1.5	3 – 16 mm
M4	0.7	2	4 – 20 mm
M5	0.8	2.5	5 – 25 mm
M6	1.0	3	6 – 30 mm
M8	1.25	4	8 – 40 mm
M10	1.5	5	10 – 50 mm
M12	1.75	6	12 – 60 mm
M16	2.0	8	16 – 60 mm
M20	2.5	10	20 – 60 mm
M24	3.0	12	25 – 60 mm

Allen key sizes shown are for standard socket set screws. Ask for inch (BSW / UNC) grub screws.

FAQ

Common questions

What is the difference between a grub screw and a set screw?

They are the same thing. 'Grub screw' is the common name in India and the UK; 'socket set screw' is the standard name in DIN / ISO catalogues.

Which grub screw point should I use?

Use cup point (DIN 916) for general locking on a shaft, flat point (DIN 913) where you adjust often or the shaft is hardened, cone point (DIN 914) for maximum hold in a drilled spot, and dog point (DIN 915) to locate in a hole or slot.