ISO 1481 ST9.5×25 Slotted Pan Tapping Screw5 combinations of material, property class and finish supplied in this size.

Standard: ISO 1481 · 2011
Thread: ST9.5 · pitch 2.1 mm
Length under head: 25 mm · 24.2–25.8 mm to ISO 1481 product grade A
Head height: 6 mm
Weight: 24.48 kg per 1 000 pieces · Theoretical, from nominal geometry — confirm before ordering40.9 pieces per kg
Also named: GB/T 5282

Supplied to ISO 1481 ST9.5×25 — the figures shown here match GB/T 5282. All 2 record the same figures in this size. Compared on the columns shown here only — product grade, tolerance class, length range, material and property-class references are set by each standard separately. We produce to whichever one your drawing calls out. Compare all sizes →

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ISO 1481 dimension tablePDF · every size

Order ST9.5×25

Set a quantity on as many rows as you need. Not listed? We make to your drawing — send it with the enquiry.

To standard

Every standard listed here records the same figures at ST9.5×25. Your choice is carried into the inquiry and the quotation.

**Stainless Steel** ST9.5 is beyond the diameter range of ISO 3506-4, which is written up to ST8. ISO 3506-4 states that fasteners outside that range may still carry its property classes, provided they meet all applicable chemical, mechanical and physical requirements. If a property class is specified for ST9.5, its order-specific evidence must demonstrate those requirements. Note: the numerical tables in ISO 3506-4 do not extend to this size, so table values are not extrapolated.
Material	Class	Finish	Quantity	Net weight
Carbon Steel	—	Plain	Quantity of ST9.5×25 · Plainpcs	—
Carbon Steel	—	Zinc Plated	Quantity of ST9.5×25 · Zinc Platedpcs	—
Carbon Steel	—	Dacromet	Quantity of ST9.5×25 · Dacrometpcs	—
Stainless Steel	—	Passivated	Quantity of ST9.5×25 · Passivatedpcs	—
Stainless Steel	—	Plain	Quantity of ST9.5×25 · Plainpcs	—

Dimensions at ST9.5×25

one row per dimension

Dimension	ISO 1481Current	GB/T 5282Current
Slot Width (nominal)n (mm)	—	2.5

12 more dimensions — identical in ISO 1481 and GB/T 5282

Thread PitchP (mm)	2.1	2.1
Thread Runout (max)a (mm)	2.1	2.1
Head Diameterdk (mm)	20	20
Head Diameter (min)dk min (mm)	19.5	19.5
Nominal Head Heightk (mm)	6	6
Head Height (min)k (mm)	5.7	5.7
Slot Width (max)n (mm)	2.81	2.81
Slot Width (min)n (mm)	2.56	2.56
Slot Depth (min)t (mm)	2.4	2.4
Radius (min)r (mm)	0.4	0.4
Point Length — C (ref.)y (mm)	8	8
Point Length — F (ref.)y (mm)	4.2	4.2

Plating adds thickness — state the finish on the order.

Other lengths in ST9.5

All sizes →

Size	kg per 1 000 pieces
ST9.5×16	19.82	open
ST9.5×25	24.48	this page
ST9.5×45	34.83	open
ST9.5×50	37.42	open

ST9.5 x 16 ST9.5 x 45 ST9.5 x 50

StandardsISO 1481 GB/T 5282 All sizes

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