Question 1

Do your fasteners meet European Pressure Equipment Directive PED 2014/68/EU?

Accepted Answer

Yes. Grade 8.8 & 10.9 bolts, studs and nuts for pressure vessel applications satisfy PED 2014/68/EU Category I-IV. Full EN 10204 3.1 material test certificates provided for all batches, covering chemical composition & mechanical properties per ISO 898-1. Matching DIN 931 / DIN 933 flange bolts for PN10-PN400 pressure ratings.

Question 2

Can you supply ASTM A193 B7/B8M stud bolts for high-temperature pressure piping?

Accepted Answer

Yes. Full series ASTM A193 stud bolts (DIN 975): Grade B7 (Cr-Mo alloy, max 450C, paired with A194 2H nuts) and B8M (316 stainless, max 540C, matched with A194 8M nuts). Sizes M10-M56, full heat treatment records & heat-number traceable material reports per shipment.

Question 3

Do you issue REACH SVHC compliance declarations for all shipments?

Accepted Answer

100% of orders come with signed REACH SVHC declarations confirming no restricted substances exceed 0.1% w/w threshold. Updated to latest ECHA candidate list (235 substances, Jan 2026). Trivalent Cr3+ passivation used, fully eliminating Cr6+ per REACH Annex XVII.

Question 4

Are your electroplated fasteners completely hexavalent chromium (Cr6+) free?

Accepted Answer

All coating lines ban Cr6+ entirely. Standard: Zinc-nickel (12-15% Ni) + trivalent blue/black passivation. 300+ hours white rust resistance for Zn-Ni, 150+ hours for pure zinc Cr3+. Fully RoHS 3 (EU 2015/863) compliant. EN ISO 3613 Cr6+ absence test reports & XRF coating thickness records provided.

Question 5

What is the core difference between EN 15048 and EN 14399, and which standard should I select?

Accepted Answer

EN 15048 is for non-preloaded bearing-type joints (Grade 4.6/5.6/8.8 for static steel buildings, warehouses). EN 14399 is for controlled preloaded friction-grip matched kits (Grade 8.8/10.9 HV/HR for bridges, seismic buildings & dynamic-load structures). Pick EN 15048 for general construction; choose EN 14399 for wind towers, overpasses and seismic zones.

Question 6

Can you supply full matched EN 14399 HR bolt-nut-washer assembly kits?

Accepted Answer

Yes. HR bolt (EN 14399-3/7) + HR nut (EN 14399-2) + 2 HR washers (EN 14399-6). Grade 8.8/10.9, M12-M36. CE marked under CPR 305/2011 with K1 Class test certificates (Annex C). Each production lot marked with unique color coding. Also manufacture HV assemblies per DIN 6914/6915/6916.

Question 7

Do EN 15048 bolts carry valid CE marking under EU CPR 305/2011?

Accepted Answer

Yes. All EN 15048 fasteners hold legal CE marking complying with CPR 305/2011 Annex ZA. Full Declaration of Performance (DoP) documenting bearing capacity, ductility class D1/D2 and fire resistance rating. Annual Factory Production Control (FPC) audit by TUV SUD notified body.

Question 8

What fastener grade and coating do you recommend for wind turbine tower flange connections?

Accepted Answer

EN 14399 HR 10.9 matched assembly kits, M30-M48. Hot-dip galvanized or sherardized coating (min 50um). -20C Charpy V-notch impact >=27J, 100% UT ultrasonic testing per EN 10160, full lot traceability. Lead time 20-30 working days for 5,000-set bulk orders.

Question 9

Can you produce EN 13482 railway fishplate bolts?

Accepted Answer

Yes. Standardized & customized rail joint fasteners compliant with EN 13482-1. Material: 42CrMo4 quenched & tempered alloy steel, Grade 8.8/10.9. Standard sizes M22x140mm, M24x170mm; custom dimensions supported. Anti-corrosion: Phosphate or Geomet 500 zinc flake. Delivered to 50+ railway projects in Europe and Southeast Asia.

Question 10

Do you supply ECE R55 certified wheel bolts for commercial trailers?

Accepted Answer

Yes. DIN 748 automotive wheel bolts satisfying ECE R55 standards. Grade 10.9, thread M14x1.5 / M16x1.5 / M18x1.5 (6g tolerance per ISO 6411). Coating: Geomet 321 zinc flake (8-12um), 720 hours salt spray resistance. Ball seat options R25/R28. Full PPAP Level 3 documentation available for OEM clients.

Question 11

What special surface treatments do you offer for extreme corrosive and high-temperature environments?

Accepted Answer

Zinc flake (Dacromet/Geomet): 720+ hours salt spray. PTFE composite: low friction 0.06-0.12, chemical resistant. Xylan 1070: continuous service up to 315C. Sherardizing: 30-50um zinc diffusion layer, eliminates hydrogen embrittlement for bolts >=10.9. All finishes come with coating thickness inspection reports.

Question 12

Which fastener ranges are suitable for tunnel and underground construction projects?

Accepted Answer

Full solution for humid underground tunnel infrastructure: A4-80 stainless DIN 7991 countersunk screws for ventilation fan housings; HDG Grade 8.8 DIN 933 hex bolts for tunnel lining segment joints; 316 stainless DIN 975 threaded rods for cable tray suspension. All meet EN 13501-1 Class A1 non-combustible fire standards with 1000+ hours salt spray certification.

Question 13

What minimum order quantity applies to EN 14399 structural bolt kits?

Accepted Answer

Standard HR/HV assembly MOQ: M12-M24 500 sets per grade/size; M27-M48 1,000 sets; Custom coatings (sherardizing, Xylan) 2,000 sets; Engineering sample 10-20 sets at cost price + DHL freight. Volume tiered pricing: 500-2,000 / 2,001-10,000 / 10,000+ sets.

Question 14

How do you prevent mixed batches during packaging of matched structural kits?

Accepted Answer

Strict lot isolation packaging: Each matched set (1 bolt + 1 nut + 2 washers) sealed in labeled poly bag with lot number, grade, size and CE mark. Small bags packed in 25kg reinforced cartons with desiccant. Cartons on shrink-wrapped steel-strapped pallets. Unique QR code on every pallet linking to full DoP, material certificates and FPC records.

Question 15

Do you provide VMI (Vendor Managed Inventory) long-term stock service?

Accepted Answer

VMI available for clients with annual procurement above $250,000. We reserve 2-4 months forecasted inventory in Shanghai bonded warehouse. 72-hour fast dispatch against call-off orders. Monthly consumption reports, automatic reorder reminders, exclusive VMI portal. Cuts inventory holding cost by 40-60%.

Geometric properties
Nominal Ø [mm]	Drive	dk	D	d	LT	L
7.5	TX30	∅10.8~11.2	∅7.2~7.5	∅45.1~5.4	Full Thread	50~180
Material	Carbon Steel
Coating	Zinc Passivation
Point	Self-drilling with serrated

Category	Item	Parameter Value
Geometric properties	Nominal Ø [mm]	7.5
	Shaft Øs [mm]	5.8
	Inner Øi [mm]	5.2
Mechanical properties	Tensile Rm [Mpa]	≥1000
	Yield Rp0.2 [Mpa]	≥900
	Shear τ [KN]	3.5
	Surface hardness [HV]	490~750
	Core hardness [HV]	320~470
	Torque [N·m]	≥20
	Bending [°]	≥25°

CONCRETE FRAME SCREW

CONCRETE FRAME SCREW

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CONCRETE FRAME SCREW

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