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Best seller Hex bolt DIN 933 — 8.8 zinc plated
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Fasteners · Hex Bolts · DIN 933

Hex Bolt DIN 933 — 8.8 Zinc Plated, M8–M20

★★★★★ 4.8 / 5 · 342 buyer reviews · 18,400+ cartons shipped
Wholesale price from
USD 24.00 / carton
Save 22% at 500+

Tier pricing (FOB Shanghai)

50 – 199 cartonsUSD 30.80 / carton
200 – 499 cartonsUSD 27.20 / carton
500 – 999 cartonsUSD 24.00 / carton
1,000+ cartonsUSD 21.60 / carton
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📦 Sample: 5–7 days via DHL/FedEx
🚚 Bulk lead time: 15 days for repeat orders
🌍 FOB Shanghai / Ningbo · DDP to 52 countries
🛡️ 24-month manufacturing warranty

Need OEM head-marking?

Custom grade, custom length, brand stamping, retail blister pack. 5–7 day sample, 30-day production.

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Industrial-grade hex bolts, graded and plated in-house.

The BoltPro DIN 933 hex head bolt is our top-selling fastener, manufactured from cold-headed medium-carbon steel, heat-treated to property class 8.8, and zinc-plated in our in-house bath. Spec'd by 410+ distributors across the EU, US and APAC.

What makes it different

  • Cold-headed, not machined. Higher tensile consistency, better grain flow, lower unit cost at scale.
  • Heat-treated in-house to ISO 898-1 property class 8.8 — min. tensile 800 MPa, yield 640 MPa.
  • Zinc plating 8–12 µm with trivalent chromate (RoHS / REACH compliant). Salt spray 96 h white rust, 240 h red rust.
  • Full traceability — every carton bar-coded with batch number, heat number and date code.
  • Dimensional inspection on a Mitutoyo UMC, AQL 1.0 on thread, AQL 0.65 on head.

Who buys it

Industrial distributors (US, UK, EU, AU), OEM machinery builders, structural steel fabricators, and Amazon FBA sellers private-labeling under their own brand. Average reorder cycle is 6–10 weeks.

SKUBP-FB-HX-933-88-M08-040-ZN
StandardDIN 933 (ISO 4017 equivalent)
Property class8.8 (ISO 898-1)
MaterialMedium-carbon steel, cold-headed
Tensile strength (Rm)≥ 800 MPa
Yield strength (Rp0.2)≥ 640 MPa
Hardness (HRC)22 – 32
Elongation at break≥ 12 %
ThreadM8 × 1.25 (6g)
Length40 mm (under head)
Head height5.3 mm
Width across flats13 mm
Surface finishZinc electroplate, trivalent chromate, 8–12 µm
Salt spray (ASTM B117)96 h white rust, 240 h red rust
Carton (inner box)200 pcs
Master carton5 inner boxes = 1,000 pcs
Pallet54 master cartons = 54,000 pcs
CertificationsISO 9001 · CE · RoHS · REACH

Packaging

  • Inner box: 200 pcs, 5-ply corrugated, batch label glued on side.
  • Master carton: 5 inner boxes = 1,000 pcs, 30 × 22 × 18 cm, 13 kg.
  • Pallet: 54 master cartons = 54,000 pcs, 120 × 100 cm, shrink-wrapped.
  • Custom retail blister packs from 1,000 pcs, 4-color print, EAN barcode applied.
  • Custom head-marking (your brand / spec) from 50,000 pcs.

Shipping

  • Samples — DHL/FedEx, 5–7 days door-to-door. Sample cost refunded against first PO.
  • Bulk — FOB Shanghai or Ningbo, 15-day production + 25–35 days transit (sea).
  • DDP — Available to US, UK, DE, FR, AU, CA. We handle customs, duties and last-mile.
  • Trade terms: T/T 30% deposit, 70% before shipment. L/C at sight for orders ≥ USD 50,000.

Common questions from B2B buyers

  • Can I mix thread sizes in one order? Yes — minimum 20 cartons per size, with a 50-carton total MOQ.
  • What's the difference between 8.8 and 10.9? 8.8 = 800 MPa tensile, 10.9 = 1,000 MPa. We recommend 10.9 for high-vibration (engine, suspension) and 8.8 for general construction.
  • Do you offer Geomet / Dacromet? Yes — 500h salt spray, MOQ 100 cartons. Lead time +10 days.
  • Is the zinc plating RoHS compliant? Yes — trivalent chromate, no hexavalent chromium. Mill cert and lab report ship with every order.
  • Can I get a fully custom head-marking? Yes. From 50,000 pcs, we can stamp your brand or a custom property class onto the head. 3D sample in 7 days.
  • What's the warranty? 24 months against manufacturing defects. We replace or refund, your call.

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