JIS BSP Male Blanking Plug

A JIS BSP male plug with a 30° flare, for blanking connections on Japanese-built machinery that uses the BSP-threaded JIS pattern.

Brand: Ayrtec – mild steel body with a plated finish, manufactured to the standards listed below.

Watch: Why You Need JIC Plugs Caps & O Ring Kit When Doing Hydraulic Repairs

Thread Standards

• JIS BSP Male (inverted BSP) – JIS B8363 – BSPP thread to ISO 228 with a 60° cone seat. It seals on the 60° cone, and although the thread matches a standard BSP the seat is not interchangeable with it.

How to Choose

• A plug is male and blocks a female port. A cap is female and covers a male end. Work out which one the open connection is before you order.
• JIS BSP uses a BSP thread with a 30° flare seat, which is not the same as a standard BSP cone.
• Check the seat angle as well as the thread before you fit it.

Technicians Advice

JIS parts catch people out because the thread screws in perfectly and the seat is wrong. If the thread feels right but it will not seal down, stop and check the seat rather than tightening harder.

Where You’ll Find It

• JIS BSP Male (inverted BSP) – Japanese-built machinery – Komatsu, Hitachi, Kobelco, Sumitomo, Kubota – where it is often just called JIS or inverted BSP.

Cross-Reference

• JIS BSP Male (inverted BSP) – JIS B8363 60° cone on a BSPP (ISO 228) thread. Also written JIS BSP or inverted BSP.

Parker, Gates, Aeroquip and Ryco all manufacture to these same standards under their own part numbering, so a fitting built to the standard above will mate with theirs.

Cross-references are given at series level as a guide to the standard, not as a part-for-part substitution. Always confirm the thread form, size and seal type against the port before ordering.

📐Dimensions & thread sizes – every size in this range

← Swipe the table sideways to see every measurement →

Part code	L	H1	Material	Finish
BJM-02	22mm	12mm	Mild steel	Plated finish
BJM-04	23mm	14mm	Mild steel	Plated finish
BJM-06	24mm	17mm	Mild steel	Plated finish
BJM-08	30mm	22mm	Mild steel	Plated finish
BJM-12	30mm	27mm	Mild steel	Plated finish
BJM-16	35mm	36mm	Mild steel	Plated finish

Key: L overall length, H1 centre to face 2. Measurements in millimetres unless shown otherwise. Thread columns show what each end mates with. Dimensions are nominal – check critical clearances against the part.

Downloads

📄 Thread Identification Chart (PDF)

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