DIN 7505 Type a Countersunk Head Chipboard Screw C1022 Yellow Zinc Plated

Product Description

Product Description

Product Overview

Fasto chipboard screws are manufactured to DIN 7505 (A)-1986 - countersunk head, reduced shank d2, coarse single-lead thread and sharp point - cross-checked against GB/T 846-2017 with mechanical properties per GB/T 3098.5-2016. The body is made from C1022 / 1022A low-carbon carburising steel, case-hardened so a hard surface layer works over a tough core: minimum surface hardness 450 HV0.3, core hardness 270-370 HV and case depth 0.05-0.28 mm depending on size. Nominal diameters run from d 2.5 mm to d 6 mm with lengths from 13 mm to 180 mm and a supply range up to 200 mm; pitches from 1.1 mm to 2.6 mm. Standard finish is electro-zinc with yellow chromate passivation at 5 μm minimum thickness. The countersunk head sinks flush with the board face, the reduced shank below the head lowers driving resistance and sharpens the thread start, and the coarse thread clears chips quickly to keep particle board, MDF and fibreboard panels from splitting. Typical use covers cabinet and furniture assembly, board-to-board joints on flat-pack units, and kitchen, office and interior fit-out board work.

Specifications

Item	Value
Product	Chipboard Screw, DIN 7505 Type A, Countersunk Head with Reduced Shank
Standard	DIN 7505 (A)-1986 (dimensions); cross-checked against GB/T 846-2017
Mechanical Properties	GB/T 3098.5-2016, grades ST2.9 - ST6.3
Material	C1022 / 1022A low-carbon carburising steel, case-hardened
Surface Hardness	450 HV0.3 min. (per GB/T 3098.5-2016)
Core Hardness	270 - 370 HV (HV5 / HV10 by size)
Case Depth	0.05 - 0.28 mm by size
Surface Treatment	Yellow zinc plated, Zn 5 μm min., electro-zinc + yellow chromate (GB/T 5267.1, ASTM B633)
Nominal Diameter	d 2.5 / 3 / 3.5 / 4 / 4.5 / 5 / 6 mm
Length	L 13 - 180 mm in production; supply range up to 200 mm
Head / Drive	Countersunk head (CSK); cross recess PZ1 / PZ2; PH, Square, Torx on request
Thread / Point	Coarse single-lead thread, full thread; sharp point, Type 17 on request
OEM Service	Custom sizes, head and drive types, packaging and private label

Dimensions per DIN 7505 (A)-1986 (mm) - d 2.5 to d 4

Item (mm)	d 2.5	d 3	d 3.5	d 4
d max. (= nominal)	2.5	3	3.5	4
d min.	2.25	2.75	3.2	3.7
P pitch (± 10%)	1.1	1.35	1.6	1.8
a max. (thread run-out)	2.1	2.35	2.6	2.8
dk max. (head dia.)	5	6	7	8
dk min.	4.7	5.7	6.64	7.64
k head height	1.4	1.8	2.0	2.35
d2 max. (reduced shank)	1.5	1.9	2.15	2.5
d2 min.	1.1	1.5	1.67	2.02
PZ slot no.	1	1	2	2

Dimensions per DIN 7505 (A)-1986 (mm) - d 4.5 to d 6

Item (mm)	d 4.5	d 5	d 6
d max. (= nominal)	4.5	5	6
d min.	4.2	4.7	5.7
P pitch (± 10%)	2.0	2.2	2.6
a max. (thread run-out)	3.0	3.2	3.6
dk max. (head dia.)	9	10	12
dk min.	8.64	9.64	11.57
k head height	2.55	2.85	3.35
d2 max. (reduced shank)	2.7	3.0	3.7
d2 min.	2.22	2.52	3.22
PZ slot no.	2	2	3

Mechanical properties per GB/T 3098.5-2016 (ST2.9 - ST6.3)

ST Size	Surface Hardness	Core Hardness	Case Depth	Break Torque Min.
ST2.9	450 HV0.3	270 - 370 HV5	0.05 - 0.18 mm	1.5 N·m
ST3.3	450 HV0.3	270 - 370 HV5	0.05 - 0.18 mm	2.0 N·m
ST3.5	450 HV0.3	270 - 370 HV5	0.05 - 0.18 mm	2.7 N·m
ST4.2	450 HV0.3	270 - 370 HV10	0.10 - 0.23 mm	4.4 N·m
ST4.8	450 HV0.3	270 - 370 HV10	0.10 - 0.23 mm	6.3 N·m
ST5.5	450 HV0.3	270 - 370 HV10	0.10 - 0.23 mm	10.0 N·m
ST6.3	450 HV0.3	270 - 370 HV10	0.15 - 0.28 mm	13.6 N·m

Fibreboard screw d sizes and GB/T self-tapping ST sizes are not one-to-one. Please state on the order or drawing which ST grade the acceptance values are taken from. A 5 μm minimum plating thickness applies to significant surfaces; threads, holes, deep recesses and corners are exempt under the standard and are not evidence of unplated areas.

Features & Advantages

• Countersunk head sinks flush with the board face, so hinges, drawer runners and flat-pack panels close up level.
• Reduced shank d2 under the head lowers driving resistance and sharpens the thread start for a cleaner bite.
• Coarse single-lead thread, pitch 1.1-2.6 mm, gives high chip clearance and low splitting in particle board and MDF.
• Case-hardened C1022 steel: hard surface over a ductile core, so the screw cuts board and still takes torque.
• Break torque verified to GB/T 3098.5-2016, from 1.5 N·m at ST2.9 to 13.6 N·m at ST6.3.
• Yellow zinc plating 5 μm min. (electro-zinc + yellow chromate passivation) for consistent corrosion protection.
• Full range d 2.5-6 mm, L 13-180 mm, supply up to 200 mm; drive PZ1 / PZ2 standard, PH, Square, Torx optional.
• Type 17 cutting point available on request for hard wood and boards that split easily.
• OEM / ODM: custom sizes, head and drive types, packaging and private label for distributors and brand owners.

Standards & Installation

Dimensions follow DIN 7505 (A)-1986 and are cross-checked against GB/T 846-2017; mechanical acceptance values are taken from GB/T 3098.5-2016 and plating from GB/T 5267.1 and ASTM B633. When ordering, state the standard and the ST grade so that dimensional and torque acceptance is unambiguous - fibreboard d sizes and GB/T ST sizes are not one-to-one. For installation, drive the screw with a PZ bit matching the slot number (PZ1 for d 2.5-3, PZ2 for d 3.5-5, PZ3 for d 6) and keep the driver in line with the screw axis to avoid cam-out. Chipboard screws are designed for direct driving into particle board, MDF and fibreboard; pre-drilling is recommended for hard wood, thin panels and edge-near positions. The countersunk head should finish flush with, or slightly below, the board surface.

Quality Control & Certificates

Controlled process from wire to packing: incoming C1022 wire with mill certificate, forming, carburising heat treatment, plating, then in-house inspection before shipment. Checks cover surface hardness and core hardness, case depth, dimensional and head geometry, thread and pitch, drive fit (PZ bit engagement), plating thickness and torque. The plant operates under the ISO 9001:2015 quality system (WSF issued, CNAS/IAF accredited) with IATF 16949 applied as the internal multi-process control standard, and holds an SGS Gold Plus Supplier Assessment. Material test certificates with traceability, hardness and dimensional reports, COC and packing list can accompany each shipment.

Packaging & Delivery

Export packing is arranged to the piece count and carton weight confirmed on the order: bulk carton for distributor and OEM volume orders, neutral carton without supplier branding, buyer label with shipping marks and carton print to specification, and blister trays for retail and DIY channels. Full cartons are palletized for container loading. Free samples are dispatched within 7 days; stock sizes ship in 7-10 days and production orders in 15-30 days depending on size, length and quantity. Trial orders start from 1,000 pieces or 100 kg, and mixed-size trial orders are accepted. Price terms on request: FOB, CFR, CIF, DDP or DAP.

About Fasto & Factory Strength

Fasto is a professional fastener manufacturer and exporter founded in 2005 and registered in Xi'an, China. Two production bases serve global orders: the Tianjin plant for carbon steel and stainless steel fasteners, and the Chongqing plant for bimetal screws; the sales and foreign trade team is based in Xi'an. Factory area exceeds 5,000 square meters with a monthly capacity of more than 800 tons, exporting to 128 countries with 74,000+ online transactions and 3,000+ successful project cases. Quality is controlled under the ISO 9001:2015 quality system (WSF issued, CNAS/IAF accredited), with IATF 16949 applied as the internal multi-process control standard. The in-house QC lab runs salt spray, hardness, torque, drilling and material composition checks, and technical reports covering tensile strength, torque and plating thickness can be issued with each order.

Since 2013 Fasto has exhibited at domestic and international hardware and fastener trade shows, and in 2025 established a subsidiary (LLC) in Saudi Arabia to serve Middle East customers directly. Company milestones: the second production base was built in 2008, multiple international certifications were obtained in 2015, and a new modern office building was completed in 2024. Supplier qualifications include the SGS Gold Plus Supplier Assessment and CE certification for bimetal screws (EN 14568), with SGS material traceability on every batch. A multilingual sales team (English, French, Spanish, Arabic, Russian) replies to inquiries within 12 hours and provides quotations within 24 hours.