Cup Square Neck Bolt (Coach Bolt)

DIN 603 (Current)Historical market reference: ISO 8677

Material: Carbon Steel, Stainless Steel, Alloy Steel
Property Class: 4.8, 8.8, A2-70, A4-80 and more
Finish: Zinc Plated, Hot Dip Galvanized, Dacromet, Blackened and more
Size range: M6–M20

Select sizes and quantities — 96 confirmed sizes to DIN 603

Material

Grade

Carbon SteelStainless SteelAlloy Steel

Finish

Find a size

dNominal Diameter (mm)	lLength (mm)	PThread Pitch (mm)	dₛBody Diameter (max) (mm)	dₛBody Diameter (min) (mm)	vSquare Neck Width (max) (mm)	MOQ
M6	20	1	6	5.52	6.48	1000
M6	25	1	6	5.52	6.48	1000
M6	30	1	6	5.52	6.48	1000
M6	35	1	6	5.52	6.48	1000
M6	40	1	6	5.52	6.48	1000
M6	45	1	6	5.52	6.48	1000
M6	50	1	6	5.52	6.48	1000
M6	55	1	6	5.52	6.48	1000
M6	60	1	6	5.52	6.48	1000
M6	70	1	6	5.52	6.48	1000
M6	80	1	6	5.52	6.48	1000
M6	90	1	6	5.52	6.48	1000
M6	100	1	6	5.52	6.48	1000
M6	110	1	6	5.52	6.48	1000
M6	120	1	6	5.52	6.48	1000
M8	20	1.25	8	7.42	8.58	1000

Showing 16 of 96 sizes

M6 × 20 × 1 × 6 × 5.52 × 6.48 × 5.52 × 4.6 × 3.4 × 16.55 × 15.45 × 3.88 × 3.12

dNominal Diameter (mm)M6

lLength (mm)20

PThread Pitch (mm)1

dₛBody Diameter (max) (mm)6

dₛBody Diameter (min) (mm)5.52

vSquare Neck Width (max) (mm)6.48

MOQ1000

M6 × 25 × 1 × 6 × 5.52 × 6.48 × 5.52 × 4.6 × 3.4 × 16.55 × 15.45 × 3.88 × 3.12

dNominal Diameter (mm)M6

lLength (mm)25

PThread Pitch (mm)1

dₛBody Diameter (max) (mm)6

dₛBody Diameter (min) (mm)5.52

vSquare Neck Width (max) (mm)6.48

MOQ1000

M6 × 30 × 1 × 6 × 5.52 × 6.48 × 5.52 × 4.6 × 3.4 × 16.55 × 15.45 × 3.88 × 3.12

dNominal Diameter (mm)M6

lLength (mm)30

PThread Pitch (mm)1

dₛBody Diameter (max) (mm)6

dₛBody Diameter (min) (mm)5.52

vSquare Neck Width (max) (mm)6.48

MOQ1000

M6 × 35 × 1 × 6 × 5.52 × 6.48 × 5.52 × 4.6 × 3.4 × 16.55 × 15.45 × 3.88 × 3.12

dNominal Diameter (mm)M6

lLength (mm)35

PThread Pitch (mm)1

dₛBody Diameter (max) (mm)6

dₛBody Diameter (min) (mm)5.52

vSquare Neck Width (max) (mm)6.48

MOQ1000

M6 × 40 × 1 × 6 × 5.52 × 6.48 × 5.52 × 4.6 × 3.4 × 16.55 × 15.45 × 3.88 × 3.12

dNominal Diameter (mm)M6

lLength (mm)40

PThread Pitch (mm)1

dₛBody Diameter (max) (mm)6

dₛBody Diameter (min) (mm)5.52

vSquare Neck Width (max) (mm)6.48

MOQ1000

M6 × 45 × 1 × 6 × 5.52 × 6.48 × 5.52 × 4.6 × 3.4 × 16.55 × 15.45 × 3.88 × 3.12

dNominal Diameter (mm)M6

lLength (mm)45

PThread Pitch (mm)1

dₛBody Diameter (max) (mm)6

dₛBody Diameter (min) (mm)5.52

vSquare Neck Width (max) (mm)6.48

MOQ1000

M6 × 50 × 1 × 6 × 5.52 × 6.48 × 5.52 × 4.6 × 3.4 × 16.55 × 15.45 × 3.88 × 3.12

dNominal Diameter (mm)M6

lLength (mm)50

PThread Pitch (mm)1

dₛBody Diameter (max) (mm)6

dₛBody Diameter (min) (mm)5.52

vSquare Neck Width (max) (mm)6.48

MOQ1000

M6 × 55 × 1 × 6 × 5.52 × 6.48 × 5.52 × 4.6 × 3.4 × 16.55 × 15.45 × 3.88 × 3.12

dNominal Diameter (mm)M6

lLength (mm)55

PThread Pitch (mm)1

dₛBody Diameter (max) (mm)6

dₛBody Diameter (min) (mm)5.52

vSquare Neck Width (max) (mm)6.48

MOQ1000

M6 × 60 × 1 × 6 × 5.52 × 6.48 × 5.52 × 4.6 × 3.4 × 16.55 × 15.45 × 3.88 × 3.12

dNominal Diameter (mm)M6

lLength (mm)60

PThread Pitch (mm)1

dₛBody Diameter (max) (mm)6

dₛBody Diameter (min) (mm)5.52

vSquare Neck Width (max) (mm)6.48

MOQ1000

M6 × 70 × 1 × 6 × 5.52 × 6.48 × 5.52 × 4.6 × 3.4 × 16.55 × 15.45 × 3.88 × 3.12

dNominal Diameter (mm)M6

lLength (mm)70

PThread Pitch (mm)1

dₛBody Diameter (max) (mm)6

dₛBody Diameter (min) (mm)5.52

vSquare Neck Width (max) (mm)6.48

MOQ1000

M6 × 80 × 1 × 6 × 5.52 × 6.48 × 5.52 × 4.6 × 3.4 × 16.55 × 15.45 × 3.88 × 3.12

dNominal Diameter (mm)M6

lLength (mm)80

PThread Pitch (mm)1

dₛBody Diameter (max) (mm)6

dₛBody Diameter (min) (mm)5.52

vSquare Neck Width (max) (mm)6.48

MOQ1000

M6 × 90 × 1 × 6 × 5.52 × 6.48 × 5.52 × 4.6 × 3.4 × 16.55 × 15.45 × 3.88 × 3.12

dNominal Diameter (mm)M6

lLength (mm)90

PThread Pitch (mm)1

dₛBody Diameter (max) (mm)6

dₛBody Diameter (min) (mm)5.52

vSquare Neck Width (max) (mm)6.48

MOQ1000

M6 × 100 × 1 × 6 × 5.52 × 6.48 × 5.52 × 4.6 × 3.4 × 16.55 × 15.45 × 3.88 × 3.12

dNominal Diameter (mm)M6

lLength (mm)100

PThread Pitch (mm)1

dₛBody Diameter (max) (mm)6

dₛBody Diameter (min) (mm)5.52

vSquare Neck Width (max) (mm)6.48

MOQ1000

M6 × 110 × 1 × 6 × 5.52 × 6.48 × 5.52 × 4.6 × 3.4 × 16.55 × 15.45 × 3.88 × 3.12

dNominal Diameter (mm)M6

lLength (mm)110

PThread Pitch (mm)1

dₛBody Diameter (max) (mm)6

dₛBody Diameter (min) (mm)5.52

vSquare Neck Width (max) (mm)6.48

MOQ1000

M6 × 120 × 1 × 6 × 5.52 × 6.48 × 5.52 × 4.6 × 3.4 × 16.55 × 15.45 × 3.88 × 3.12

dNominal Diameter (mm)M6

lLength (mm)120

PThread Pitch (mm)1

dₛBody Diameter (max) (mm)6

dₛBody Diameter (min) (mm)5.52

vSquare Neck Width (max) (mm)6.48

MOQ1000

M8 × 20 × 1.25 × 8 × 7.42 × 8.58 × 7.42 × 5.6 × 4.4 × 20.65 × 19.35 × 4.88 × 4.12

dNominal Diameter (mm)M8

lLength (mm)20

PThread Pitch (mm)1.25

dₛBody Diameter (max) (mm)8

dₛBody Diameter (min) (mm)7.42

vSquare Neck Width (max) (mm)8.58

MOQ1000

Product details

Description: The cup square neck bolt, manufactured to DIN 603, features a round head and a square neck that resists rotation during assembly. It is supplied in diameters M6 and M8 with lengths from 20 mm to 90 mm. Material options include carbon steel, alloy steel, and stainless steel, with grades 4.8, 8.8, 10.9, A2-70, and A4-80. Surface finishes cover zinc plated, hot dip galvanized, Dacromet, blackened, phosphate, plain, and passivated. When requesting a quotation, specify the required diameter, length, material, grade, and finish.
Features: Round head with square neck to prevent turning during tightening · Threaded shank with metric coarse pitch per DIN 603 · Available in M6 and M8 diameters, lengths 20–90 mm · Supplied in carbon steel, alloy steel, and stainless steel with multiple finishes
Applications: General machinery assembly, Equipment mounting, Maintenance and repair work

Order assurance

Confirmed for the quoted product and order.

Reports & inspection

Agreed in the quotation.

EN 10204 3.1 material certificate
Dimensional inspection report
Certificate of conformity
Mechanical test report
Chemical analysis report
Coating inspection report
Batch and lot traceability

Packaging & delivery

Options we supply.

Bulk carton packing
Small boxes with outer cartons
Palletized shipment
Fumigation-free pallets
Inner poly bags
Buyer branding and labels

Product questions

What sizes of Cup Square Neck Bolt (Coach Bolt) do you supply?

Execution standard: DIN 603. The confirmed specification table covers M6–M20 diameters and 20–150 lengths. Use the specification table to select the exact variant required for quotation.

Which materials, grades and finishes can I order?

Material: Carbon Steel, Stainless Steel, Alloy Steel; Property class: 4.8, 8.8, A2-70, A4-80, 10.9; Finish: Zinc Plated, Hot Dip Galvanized, Dacromet, Blackened, Phosphate, Plain, Passivated. Availability should be confirmed against the selected specification and order quantity.

Can I order DIN 603 against an ISO 8677 drawing?

ISO 8677 is the corresponding standard recorded for DIN 603 in the TAURUS standard library. Send the drawing with your enquiry: the execution standard is confirmed line by line on the quotation, and any dimension that differs between the two tables is pointed out before the order.