Description
1233246 Hex Socket Cap Head Screw M4x20 SS A2 ISO 4762 — BOLTON SKU 57301.
About the 1233246 Hex Socket Cap Head Screw
ISO 4762 defines the hexagon socket head cap screw: a cylindrical head driven by an internal hexagon, the profile most engineering drawings still call by its former designation DIN 912. This variant, catalogued as 1233246 screw hex socket cap, is M4 x 20 mm in A2 austenitic stainless steel. For M4 the standard sets a maximum head diameter of 7.00 mm and a maximum head height of 4.00 mm, driven by a 3 mm hexagon key. The M4 coarse thread has a pitch of 0.7 mm. A2 is the general-purpose austenitic stainless grade — non-magnetic in the annealed condition and corrosion resistant in normal atmospheric and freshwater service, though not the grade specified where chlorides or marine exposure are expected. The compact head allows the screw to be counterbored flush or fitted where a hexagon spanner could not be swung.
Key specifications
| Standard | ISO 4762 (equivalent DIN 912) |
|---|---|
| Thread | M4, 0.7 mm pitch |
| Length | 20 mm |
| Material | A2 austenitic stainless steel |
| Head diameter | 7.00 mm max |
| Head height | 4.00 mm max |
| Drive | 3 mm hexagon socket |
| Reference | 1233246 |
Typical applications
At 20 mm the shank is long enough to pass through a plate and pick up a reasonable thread engagement in a tapped boss, making this length a common choice for bracket-to-chassis and cover-to-frame joints in light structures. The A2 grade suits indoor equipment, enclosures and general workshop assembly where the joint may be broken and remade for maintenance. Counterbored fixings on machined housings are a frequent use, since the small head sits below the surface without a special washer.
Supplied by BOLTON Technical Equipment Supplies against request for quotation. Add this item to your RFQ basket to request pricing, lead time and documentation requirements (e.g. CoC, datasheets or test reports where applicable).
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