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FAQs

Its strength: 8.8 is the engineering baseline, 10.9 and 12.9 the high-tensile classes designs specify where loads demand — marked on the head, assumed by every torque table and joint calculation around it. Replace like with like or better, never lower: an unmarked or downgraded bolt in a rated joint is the failure waiting.

Usually the opposite: common A2-70 and A4-70 stainless sit below 8.8 carbon steel in strength — stainless buys corrosion resistance, not muscle — and substituting it into a rated joint without checking is a classic quiet downgrade. A4 adds marine-grade corrosion resistance over A2; the strength class is listed per product either way.

By the head's convention: countersunk heads measure overall — the head buries — while hex, cap and button heads measure from under the head to the tip. Thread size and pitch come first (metric coarse unless the application says fine), then length by the right convention; both are listed per product.

Full nut depth at minimum, with the standard's expectation of a thread or two proud beyond — and in tapped holes, engagement scaled to the material: roughly the diameter in steel, more in aluminium and iron. Short engagement strips threads at the torque the class deserves; the cheap fix is the right length bolt.

Returns are accepted within 30 days of purchase, in original packaging, on orders delivered within the United Kingdom. For damaged-on-arrival items, report within 24 hours with photographs to [email protected] — we will typically arrange collection and replacement at no cost to you. For parts that don't fit your machine, the Fit Guarantee covers a hassle-free return at no cost. For buyer's remorse — you've changed your mind or ordered the wrong item, email us first to obtain a Return Merchandise Number; a restocking fee may apply. Refunds are issued to the original payment method once the return is inspected.

Delivery time depends on the product, your destination, and availability — the estimated time for any item appears on the product page, and 'Check where we deliver' confirms coverage for your postcode before you order. Next-day delivery is available on most products; the option appears at checkout when applicable. We deliver across the UK, Europe, the Middle East, and Africa. Use the country selector at checkout to confirm coverage and delivery options for your destination.

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Screws & Bolts

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Screws and bolts are the fastener section's main act: the hex bolts, setscrews, cap heads and machine screws that hold machinery, equipment and fabrication together, bought as specifications because a bolt is its standard, grade and dimensions or it is a liability. PartsForMachines supplies screws and bolts to the DIN and ISO standards, with the Fabory ranges anchoring the section and the Disc-Lock locking hardware alongside.

The buying language is the standard's: thread size and pitch, metric coarse dominating with fine pitches where specified, length measured by the convention the head form sets, head pattern, hex, socket cap, countersunk, button, and the property class that decides everything under load, 8.8 the engineering baseline, 10.9 and 12.9 where design demands, marked on the head and listed per product, with A2 and A4 stainless covering corrosion at their own strength classes. Zinc and stronger coatings cover the carbon grades. Trade pack and box quantities serve the stores reality.

The disciplines are torque-table honesty: property class never downgraded in replacement, since the design assumed the marking, torque set to the class and lubrication state, stainless never assumed to match 8.8, because A2-70 doesn't, and threads engaged the full nut depth plus protrusion that the standards expect.

Nuts, washers and the section's rows complete the joint alongside. For specification questions, contact the team via WhatsApp 07754288583.

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FAQs

Its strength: 8.8 is the engineering baseline, 10.9 and 12.9 the high-tensile classes designs specify where loads demand — marked on the head, assumed by every torque table and joint calculation around it. Replace like with like or better, never lower: an unmarked or downgraded bolt in a rated joint is the failure waiting.

Usually the opposite: common A2-70 and A4-70 stainless sit below 8.8 carbon steel in strength — stainless buys corrosion resistance, not muscle — and substituting it into a rated joint without checking is a classic quiet downgrade. A4 adds marine-grade corrosion resistance over A2; the strength class is listed per product either way.

By the head's convention: countersunk heads measure overall — the head buries — while hex, cap and button heads measure from under the head to the tip. Thread size and pitch come first (metric coarse unless the application says fine), then length by the right convention; both are listed per product.

Full nut depth at minimum, with the standard's expectation of a thread or two proud beyond — and in tapped holes, engagement scaled to the material: roughly the diameter in steel, more in aluminium and iron. Short engagement strips threads at the torque the class deserves; the cheap fix is the right length bolt.

Returns are accepted within 30 days of purchase, in original packaging, on orders delivered within the United Kingdom. For damaged-on-arrival items, report within 24 hours with photographs to [email protected] — we will typically arrange collection and replacement at no cost to you. For parts that don't fit your machine, the Fit Guarantee covers a hassle-free return at no cost. For buyer's remorse — you've changed your mind or ordered the wrong item, email us first to obtain a Return Merchandise Number; a restocking fee may apply. Refunds are issued to the original payment method once the return is inspected.

Delivery time depends on the product, your destination, and availability — the estimated time for any item appears on the product page, and 'Check where we deliver' confirms coverage for your postcode before you order. Next-day delivery is available on most products; the option appears at checkout when applicable. We deliver across the UK, Europe, the Middle East, and Africa. Use the country selector at checkout to confirm coverage and delivery options for your destination.

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