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Specialty Fasteners › Quarter-Turn, Captive & Panel Fasteners

Reamer Hex Socket Chess Head Captive Bolt with Knurling

Updated 2026-11-04 · Markdown version

Model no. DIN/ISO/GB

US$0.036 / piece

MOQ 50 pieces · Final price confirmed in your quote

Grade: A2-70 A4-70
Head Type: Socket Head
Material: Stainless Steel
Standard: DIN, GB
Thread: Unc
Color: Silver White
Head Style: Chess
Package Size: 28.00cm * 27.00cm * 18.00cm

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Specifications are as listed for this product. Engineering Hardware & Fasteners confirms ratings, mating parts, compatibility, packing and lead time with you before you order.

Specifications

Model NO.	DIN/ISO/GB
Grade	A2-70 A4-70
Head Type	Socket Head
Material	Stainless Steel
Standard	DIN, GB
Product Name	DIN912 Screws
Drawing	Accept
Sample	Free Sample When Is in Stock
Thread	Unc
Service	Custom-Made Service
Color	Silver White
Type	Cheese Head
Groove	Hexagon
Connection	Common Bolt
Head Style	Chess
Transport Package	Plastic Bags and Cartons
Specification	M3-M30
Origin	China
HS Code	7318160000
Production Capacity	3000000 Pieces/ Month
Package Size	28.00cm * 27.00cm * 18.00cm
Package Gross Weight	18.200kg
Lead Time	7 days (1 - 1000 Pieces) To be negotiated ( > 1000 Pieces)
Customization	Available
Drive Type	Hex Socket Drive
Finish	Passivated
Shipping Cost	Contact the supplier about freight and estimated delivery time.
What is captive screw	A captive screw is designed to prevent this from occurring. It can freely rotate within the first component, with some axial movement, but it's unable to separate from it. Captive screws are used when fasteners must remain attached to equipment, such as in cover panels. They are a requirement for several machinery safety standards.
Category	Quarter-Turn, Captive & Panel Fasteners

Technical parameters

Standard	DIN 7964 (E)
Diameter	#2-1/2" & M3-M30;Customized
sample service	Free sample but freight cost is paid by customers(when sample is in stock) sample fee(when samples need to be customized)
Material	SS304,SS316,SS2205,SS2507
MOQ	1000
Surface treatment	Plain, black oxide
Package	Plastic bag, Boxes and cartons, Pallets, Customized
Price terms	EXW, FOB, CIF, etc.
Payment terms	T/T, Paypal, L/C, Western union, etc.
Certifications	ISO 9001
Note	Free Samples could be provided for standard fastener

Thread Size d	M2.5	M3	M4	M5	M6	M8	M10	M12	M16	M20	M24	M30
P	0.45	0.5	0.7	0.8	1	1.25	1.5	1.75	2	2.5	3	3.5
b1	0 ~ +2P	type K / short thread	3.2	3.8	5	6.25	7.5	10	12.5	15	20	25	30	38
type L / long thread	10	12	14	16	18	22	26	30	38	46	54	66
b2	0 ~ +2P	type K / short thread	3.75	4.5	6	7.55	8.5	11.2	14.3	17.5	23	28.5	33.5	43
type L / long thread	10.55	12.7	15	17.3	19	23.2	27.8	32.5	41	49.5	57.5	71
ds	max	1.9	2.3	3	3.9	4.6	6.2	7.7	9.2	12.7	16.2	19.2	24.2
min	1.7	2.1	2.8	3.7	4.4	6	7.5	9	12.5	16	19	24
r	min	0.1	0.1	0.2	0.2	0.25	0.4	0.4	0.6	0.6	0.8	0.8	1
dk	max	For plain head	4.5	5.5	7	8.5	10	13	16	18	24	30	36	45
For knurled heads	4.68	5.68	7.22	8.72	10.22	13.27	16.27	18.27	24.33	30.33	36.39	45.39
min	4.32	5.32	6.78	8.28	9.78	12.73	15.73	17.73	23.67	29.67	35.61	44.61
e	min	2.3	2.87	3.44	4.58	5.72	6.86	9.15	11.43	16	19.44	21.73	25.15
k	max	2.5	3	4	5	6	8	10	12	16	20	24	30
min	2.36	2.86	3.82	4.82	5.7	7.64	9.64	11.57	15.57	19.48	23.48	29.48
s	Nominal Size	2	2.5	3	4	5	6	8	10	14	17	19	22
min	2.02	2.52	3.02	4.02	5.02	6.02	8.025	10.025	14.032	17.05	19.065	22.065
max	2.06	2.58	3.08	4.095	5.14	6.14	8.175	10.175	14.212	17.23	19.275	22.275
t	min	1.1	1.3	2	2.5	3	4	5	6	8	10	12	15.5

Description

Reamer Hex Socket Chess Head Captive Bolt with Knurling is part of our quarter-turn, captive & panel fasteners range (Specialty Fasteners).

Key details

Type: Cheese Head
Standard: DIN, GB
Material: Stainless Steel
Grade: A2-70 A4-70
Thread: Unc
Head Type: Socket Head
Head Style: Chess
Groove: Hexagon

Available configurations include grade, head type, material, standard and thread. Custom sizes, threads, materials, grades, platings and packaging can be quoted on request.

Ordering through Engineering Hardware & Fasteners

Minimum order is 50 pieces at US$0.036 per piece. Send one inquiry with the part number, quantity and destination, and Engineering Hardware & Fasteners confirms size, thread, material, grade, finish, price, lead time and shipping, checks the goods before dispatch and ships them to you.

Frequently asked questions

What is the minimum order quantity (MOQ) for Reamer Hex Socket Chess Head Captive Bolt with Knurling?

The listed minimum order is 50 pieces, at US$0.036 per piece. Smaller trial quantities or samples can be requested in your inquiry; Engineering Hardware & Fasteners confirms what is possible for your size.

What are the main specifications of Reamer Hex Socket Chess Head Captive Bolt with Knurling?

Type: Cheese Head; Standard: DIN, GB; Material: Stainless Steel; Grade: A2-70 A4-70; Thread: Unc; Head Type: Socket Head. The full specification table and any technical parameter tables are listed on this page.

Can this product be customized (OEM)?

Listed configurations include grade, head type, material, standard and thread. Size, thread, length, material and grade, surface finish, head marking, packaging and labels can be quoted to your specification or drawing.

What is the lead time and how is it shipped?

Lead time depends on quantity and customization and is confirmed in your quote. Engineering Hardware & Fasteners checks the goods before dispatch and ships by express, air or sea; mixed orders can be consolidated in one shipment.

Which other quarter-turn, captive & panel fasteners are available?

The Quarter-Turn, Captive & Panel Fasteners category lists 403 products in different sizes, materials and finishes: https://engineeringhardware.com/fastener-products/specialty-fasteners/quarter-turn-captive-panel-fasteners/

How we work

Specified, checked and shipped by Engineering Hardware & Fasteners

Engineering Hardware & Fasteners supplies bolts, screws, nuts, washers, anchors, rivets and fastening hardware to equipment makers, contractors, distributors and maintenance teams. Orders go through one controlled process: size, thread, material, grade and finish confirmed, samples approved, dimensions, thread fit and plating checked before packing, then packed for export — standard or made to drawing.

DIN, ISO, ASTM, ANSI, JIS and GB standard parts
Non-standard parts made to your drawing
Dimensions, thread gauges and plating checked before packing
Export cartons and pallets, consolidated mixed orders
Samples available for approval before mass production

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