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Stainless 316 Mbspp X Fbspp

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Description & Features

A straight stainless 316 adapter connecting a 1/4" male BSPP thread (G 1/4-19) to a 3/8" female BSPP thread (G 3/8-19), the Stainless 316 Mbspp X Fbspp is manufactured by Adaptall for use in hydraulic and industrial fluid systems requiring corrosion-resistant connections between differing BSPP port sizes.

Machined from 316 stainless steel, this fitting offers reliable resistance to corrosion in demanding environments. The straight configuration measures 34.8mm in length with a 22mm across-flats width, making it well suited for compact installation. Both sides use BSPP (parallel) thread forms, with the male and female ends allowing direct thread engagement at the respective port sizes.

SKU: SS9039-04-06

Supplier Part Number (MPN): SS9039-04-06

Specifications

Connection Size 1
1/4 in
Connection Size 2
3/8 in
Connection Type
Female BSP, Male BSP
Connection Type 1
Male BSPP 60 deg Flare
Connection Type 2
Female BSPP 60 deg Flare
Dimension Standards
BS 5200
Dimensions
33 mm L
Fitting Type
Bushing
Hex Size
22 mm
Material
Stainless Steel
Material Construction
316 Stainless Steel
Series
SS9039 Series
Thread Size
1/4-19 x 3/8-19

Product Questions & Answers (3)

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Question by: Hank G on Sep 10, 2025, 8:34 PM
got a port that’s G 1/4-19 male BSPP and i need to end up at a G 3/8-19 female BSPP. is that what this adapter does?
Answer by: Customer Support on Sep 12, 2025, 8:20 PM
For stepping between BSPP sizes, it connects a G 1/4-19 male BSPP on one end to a G 3/8-19 female BSPP on the other, in a straight adapter body.
Question by: Lance F on Apr 29, 2025, 12:10 PM
Got a port on a hydraulic manifold that's 3/8 female BSPP and the line coming into it is 1/4 male BSPP. This fitting gonna bridge that gap straight up?
Answer by: Customer Support on Apr 30, 2025, 9:49 PM
That's exactly what this adapter is built for. The male end threads into a 1/4" BSPP port (G 1/4-19) and the female end accepts a 3/8" BSPP male connection (G 3/8-19), so it steps between those two sizes in a straight configuration. Both ends use parallel BSPP thread forms, so there's no mixing of thread types. At 34.8mm long and 22mm across the flats, it's compact enough to fit into tighter installations without a lot of extra clearance needed.
Question by: Carl R on Jul 28, 2025, 7:29 PM
So this is a 1/4" male to a 3/8" female, both BSPP? Just want to make sure I'm readin' it right.
Answer by: Customer Support on Jul 30, 2025, 4:31 PM
That's correct. This adapter has a 1/4" male BSPP thread on one end and a 3/8" female BSPP thread on the other, connected by a straight body.

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