High-Strength Carbon & Stainless Steel Hex Bolts – DIN 931/933 Metric Fasteners, M3–M64 for Industrial Construction

Dual standard compliance

• – Fully compliant with DIN 931 (partial thread) and DIN 933 (full thread), ensuring seamless integration into existing metric and imperial engineering projects

High load-bearing capacity

• – Available in tensile grades 8.8, 10.9, and 12.9, engineered for heavy-duty structural applications requiring maximum shear and tensile strength

Superior corrosion resistance

• – Stainless steel A2-70/A4-80 bolts and hot-dip galvanized (HDG) carbon steel variants provide exceptional protection in marine, chemical, and outdoor environments

Precision thread rolling

• – Advanced rolling technology achieves 6g/6h thread tolerance for smooth nut engagement and superior vibration resistance in dynamic load scenarios

100% batch traceability

• – Every production lot undergoes rigorous mechanical testing and dimensional verification, backed by IATF 16949 and ISO 9001:2015 certifications

Carbon steel grades

• : SCM435, 10B21, 1045, and 1018 steel for standard to high-tensile applications

Stainless steel

• : SUS304 (A2) for general food/medical use; SUS316 (A4) for high-salinity marine environments

Zinc plating (white/yellow/blue)

• : ASTM B633 compliant, 5–15 μm layer for indoor and general-purpose corrosion protection

Hot-dip galvanizing (HDG)

• : ASTM A153 / ISO 1461, 50–85 μm coating for outdoor structural use with 50+ year service life

Dacromet / Geomet

• : High-performance zinc-flake coating — preferred for automotive industry and renewable energy sectors

Plain / black oxide

• : For oiled machinery parts and internal applications

Steel structure construction

• – Critical connection points for skyscrapers, warehouses, and bridges using high-strength structural bolts

Automotive manufacturing

• – Engine assembly and chassis components requiring IATF 16949 certified quality

Oil & gas infrastructure

• – Heavy-duty stainless steel bolts for offshore platforms and piping systems

Energy sector

• – Solar panel mounting racks and wind turbine internal structural components

Industrial machinery

• – Power transmission systems, pumps, and heavy excavators

Railway & transport

• ● – Track fastening and rolling stock assembly

Pyramid Hardware Fasteners Co., Ltd. brings 15+ years of precision bolt manufacturing experience from our 6th of October City facility in Giza, Egypt. Our strategic location near the Suez Canal enables rapid global shipping to 30+ countries. ISO 9001:2015 and IATF 16949 certified production lines ensure 100% batch consistency across all 70+ product varieties. Our 50+ high-speed production machines maintain a 98.5% on-time delivery rate — and factory-direct pricing delivers 15–30% savings versus global distributor channels.

Standard packing

• : 25kg/carton, 36–48 cartons per fumigated wooden pallet (approx. 1 ton per pallet)

Bulk options

• : Woven bags or plastic buckets available on request

Port of loading

• : Alexandria / Port Said / Damietta, Egypt

Incoterms

• : FOB / CIF / CFR

Lead time

• : Samples in 10–15 days; bulk orders in 15–25 working days

Q1: What is the difference between DIN 931 and DIN 933?

DIN 933 specifies a bolt that is fully threaded from the head to the tip, whereas DIN 931 features a partial thread with a smooth shank under the head — ideal for shear-load applications.

Q2: Do you provide Material Test Certificates (MTR)?

Yes, every shipment is accompanied by a 3.1 Material Test Certificate including chemical composition and mechanical properties per EN 10204.

Q3: Can you handle third-party inspections?

Absolutely. We regularly work with SGS, Bureau Veritas, and TÜV for pre-shipment inspections as per client requirements.

Q4: What is your typical MOQ for hex bolts?

Typically 500–1,000 pieces per size, depending on whether it is a stock item or custom production run.

Q5: How do you ensure hex bolt thread quality?

We use 100% batch inspection with GO/NO-GO thread gauges and profile projectors to verify 6g/6h tolerance compliance on every production lot.