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Zinc-plated steel carriage bolt, round head, square neck, 90 mm length, pack of 50

Zoro Select

Zoro Select Carriage Bolt M8-1.25 90 mm Class 4.6 Zinc PK50

SKU CH-HZEY-HQ7GF

Metric M8-1.25 carriage bolts, 90 mm long, Class 4.6 steel with zinc finish, pack of 50

  • Product typeScrews & Bolts
  • M8-1.25 metric coarse thread fits standard applications
  • Class 4.6 steel rated at 58,000 psi tensile strength
  • Zinc plated finish resists corrosion in outdoor use
  • Square neck locks into wood to prevent spinning
  • 50-piece pack covers multiple fastening jobs

Carriage Bolt M8-1.25 90 mm Class 4.6

These carriage bolts feature a metric M8-1.25 thread and a 90 mm length. The round head measures 19.35 to 20.65 mm in diameter with a 4.88 mm height. A square neck of 8.58 mm width and 5.60 mm height prevents rotation during tightening. They are made from Class 4.6 steel with a zinc-plated finish and conform to DIN 603.

Suitable applications and limits

The pack contains 50 pieces for general fastening where a smooth, finished head is required. The zinc plating provides standard corrosion resistance for indoor or dry outdoor use. They are not suited for structural joints needing high-strength grades such as Class 8.8 or above. Buyers needing stainless steel for marine environments or a different thread pitch should select another product.

Deciding specification: tensile strength 58,000 psi

The Class 4.6 rating gives a tensile strength of 58,000 psi, which defines the bolt's load capacity. This figure determines whether the fastener meets the mechanical requirements of your assembly. Verify that this strength level satisfies the design calculations before purchasing.

How it compares

Measured against everything we stock in General Hardware & Accessories, at today’s prices. Recalculated every night.

Price $24.99
Pricier than about 57% of the 2,607 comparable items (median $18.99).

Specifications

Product
Brand nameZORO SELECT
Product typeScrews & Bolts

Questions about this item

Do I need an M8-1.25 nut and a 20 mm washer for each bolt?

Yes, the M8-1.25 metric coarse thread requires a matching nut and a washer sized for the 19.35–20.65 mm head diameter.

Will the 8.58 mm square neck fit the 9 mm square holes in my existing DIN 603 brackets?

The 8.58 mm square width is made for standard DIN 603 square holes, so it seats securely in brackets cut to that spec.

How can I confirm the 50 bolts meet the Class 4.6 tensile rating after installation?

Check the head markings for the 4.6 grade stamp and verify the 58,000 psi tensile strength with a calibrated torque wrench at the recommended preload.

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