Alloy steel hexagon socket head shoulder screw DIN 7379 grade 12.9

Shoulder Bolts · DIN 7379 · Grade 12.9

Alloy Steel Socket Shoulder Screws

Hexagon socket head shoulder screws with a precision-ground shoulder — used as pivots, guides, axles and stripper bolts in press tools, jigs, fixtures and machinery.

Also calledShoulder boltShoulder screwStripper boltAllen shoulder boltSocket head shoulder bolt

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Overview

About our socket shoulder screws range

A socket shoulder screw has three parts: a socket (allen) head, a smooth precision-ground shoulder, and a shorter threaded section of smaller diameter. The shoulder acts as an accurate pin or axle for parts that rotate or slide, while the thread clamps the screw into place. That makes shoulder screws the standard choice for pivot points, linkages, guide pins, cam followers, pulleys and the stripper plates in press tools and dies.

We stock alloy steel hexagon socket head shoulder screws to DIN 7379 in grade 12.9, from 6 mm shoulder (M5 thread) up to 24 mm shoulder (M20 thread), with shoulder lengths from 8 mm to 150 mm. Sizes are specified as shoulder diameter × thread × shoulder length — for example 10 × M8 × 30 or 16 × M12 × 50.

Common sizes we supply: 6 × M5, 8 × M6, 10 × M8, 12 × M10, 16 × M12, 20 × M16 and 24 × M20 series — for example 8 × M6 × 20, 10 × M8 × 30, 12 × M10 × 40, 16 × M12 × 50 and 20 × M16 × 60 — in grade 12.9.

Also known in the trade as: Shoulder bolt, Shoulder screw, Stripper bolt, Allen shoulder bolt, Socket head shoulder bolt, Precision shoulder screw, Pivot bolt.

Makes / Suppliers

Available makes

Alloy Steel 12.9DIN 7379 standard range

Local MakeEconomical option

ImportedOn request

Specifications

Technical specifications

Product: Hexagon socket head shoulder screw (shoulder bolt)
Standard: DIN 7379 · ISO 7379
Material: Alloy steel, hardened and tempered
Grade: 12.9
Shoulder Diameter: 6, 8, 10, 12, 16, 20, 24 mm
Thread: M5, M6, M8, M10, M12, M16, M20
Shoulder Length: 8 mm – 150 mm
Drive: Hexagon socket (allen key)

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.

Sizes

Shoulder screw sizes we stock (DIN 7379, grade 12.9)

Shoulder Dia	Thread	Pitch (mm)	Shoulder Lengths Available (mm)
6 mm	M5	0.8	8, 10, 12, 16, 20, 25, 30, 35, 40, 45
8 mm	M6	1.0	10, 12, 16, 20, 25, 30, 35, 40, 45, 50, 60, 65, 70, 75, 80
10 mm	M8	1.25	12, 16, 20, 25, 30, 35, 40, 45, 50, 60, 65, 75, 80, 90, 100
12 mm	M10	1.5	16, 20, 25, 30, 35, 40, 45, 50, 60, 65, 70, 75, 80, 90, 100, 110, 120, 130, 140, 150
16 mm	M12	1.75	20, 25, 30, 35, 40, 45, 50, 60, 65, 70, 75, 80, 90, 100, 110, 120, 130, 140, 150
20 mm	M16	2.0	30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 90, 100, 110, 120
24 mm	M20	2.5	40, 45, 50, 60, 70, 80, 90, 100, 120

Size format: shoulder diameter × thread × shoulder length, e.g. 12 × M10 × 40. Non-listed lengths on request.

FAQ

Common questions

What is a shoulder screw used for?

Shoulder screws are used as pivots, axles, guide pins and stripper bolts. The smooth shoulder lets a part rotate or slide on it, while the thread holds the screw in place — common in press tools, dies, jigs, fixtures, linkages and conveyor equipment.

How do I order a shoulder screw size?

Give the shoulder diameter, thread and shoulder length — for example 10 × M8 × 30 means a 10 mm shoulder, M8 thread and 30 mm shoulder length (measured from under the head to the start of the thread).

Is a shoulder bolt the same as a stripper bolt?

Yes. In press tools and dies, socket shoulder screws are commonly called stripper bolts because they guide and retain the stripper plate.