Other parts
Low Head Socket Cap Screw
Low head socket cap screw - BDT alloy steel and BSTS stainless steel low head socket cap screws in M2 to M10. Wholesale supply with OEM/ODM customization.
Specifications
- Type
- Low head socket cap screw
- Type codes
- BDT (alloy steel); BSTS (stainless steel)
- Thread sizes
- M2, M2.5, M3, M4, M5, M6, M8, M10
- Lengths
- 3 - 30 mm by size, per dimension table
- Materials
- BDT: SCM435, 32-39 HRC, black oxide, class 10.9; BSTS: SUS304
- Drive
- Hex socket
- Customization
- OEM/ODM to drawing or sample
- Brand
- SKN Fastener Co., Ltd.
- Origin
- Made in Shenzhen, China
- Quotation
- Send drawing or sample to sales@sknfastener.com
Overview
Low head socket cap screws use a reduced-height head with a hex socket drive, so they sit low in counterbored joints and tight assemblies. The BDT type is alloy steel with a black oxide finish; the BSTS type is SUS304 stainless steel. Sizes cover M2 to M10.
Available Sizes and Options
Eight thread sizes from M2 to M10, with lengths from 3 mm to 30 mm depending on size (see the tables). Custom sizes, lengths, and materials are quoted from your drawing under our OEM/ODM service.
Full specification sheet: type and material options, and the M2 to M10 dimension table (mm). A = head diameter; B = hex socket; t = head height; r = fillet radius.
Type | Material | Hardness | Surface treatment | Strength class | Head strength class |
|---|---|---|---|---|---|
BDT | SCM435 | 32 - 39 HRC | Black oxide | 10.9 | 5.8 (M10 4.8) |
BSTS | SUS304 | - | - | - | - |
M | L | M x P | A | B | t max | (e) max | r | r (BSTS) |
|---|---|---|---|---|---|---|---|---|
M2 | 3, 4, 5, 6, 8, 10, 12 | 2x0.4 | 4 | 1.3 | 1.2 | 1.2 | 0.1 min | - |
M2.5 | 3, 4, 5, 6, 8, 10, 12 | 2.5x0.45 | 5 | 1.3 | 1.5 | 1.5 | 0.1 min | 0.2 min |
M3 | 4, 5, 6, 8, 10, 12, 14, 16 | 3x0.5 | 6 | 1.5 | 2 | 1.6 | 0.1 min | 0.2 min |
M4 | 5, 6, 8, 10, 12, 14, 16, 18, 20 | 4x0.7 | 8 | 2 | 2.5 | 1.6 | 0.2 min | 0.2 min |
M5 | 6, 8, 10, 12, 14, 16, 18, 20, 25 | 5x0.8 | 9 | 3 | 3 | 2 | 0.2 min | 0.2 min |
M6 | 6, 8, 10, 12, 14, 16, 18, 20, 25, 30 | 6x1.0 | 10 | 3 | 4 | 2.5 | 0.25 min | 0.2 min |
M8 | 6, 8, 10, 12, 14, 16, 18, 20, 25, 30 | 8x1.25 | 13 | 4 | 5 | 3 | 0.4 min | 0.2 min |
M10 | 10, 12, 14, 16, 18, 20, 25, 30 | 10x1.5 | 16 (15) | 5 | 6 | 3.5 | 0.4 min | 0.2 min |
Materials and Finishes
BDT: SCM435 alloy steel, hardness 32 - 39 HRC, black oxide, strength class 10.9 (head strength class 5.8, M10 4.8). BSTS: SUS304 stainless steel. Special materials and finishes follow your drawing.
Applications
Counterbored joints and tight assemblies on machinery, fixtures, panels, and equipment where a low-profile head is needed. SKN fasteners serve six industries: manufacturing, aviation equipment, industrial equipment, medical devices, stage and entertainment, and the marine industry.
Buyer FAQs
Q: What information do you need to quote?
A: The type (BDT or BSTS), thread size, length, and quantity. A drawing or sample speeds everything up.
Q: Can you manufacture from a drawing or sample?
A: Yes. Send the drawing or sample and we manufacture to match under our OEM/ODM service.
Q: Do you supply bulk orders worldwide?
A: Yes. We supply B2B customers, wholesalers, and OEM clients worldwide from Shenzhen with export packing.
