Does the Hex plug with male thread, stainless steel 121H support replacement O-rings, and which part number fits the FKM 90 seal?

Yes. The Hex plug with male thread, stainless steel 121H supports replacement O-rings. For the version equipped with an O-ring seal (UNF and UN thread), the specified material is an FKM 90 O-ring; therefore the compatible replacement part is the FKM 90 O-ring specified for the Hex plug with male thread, stainless steel 121H. If you need the exact manufacturer part number, provide the supplier or catalogue reference.commonly the replacement is listed as âFKM 90 Oâringâ matched to the 121H plug in the supplierâs spareâparts list.

Is the Hex plug with male thread, stainless steel 121H compatible with other seal materials besides FKM 90?

Based on the provided description, the Hex plug with male thread, stainless steel 121H is supplied with an FKM 90 Oâring as the specified seal. While the plug body (AISI 316) and thread types (NPT, BSP, BSPT, UNF, UN) are compatible with a wide range of seal materials in principle, actual compatibility with alternatives (e.g., EPDM, NBR, PTFE, FFKM, silicone) depends on operating conditions: media (chemicals, solvents), temperature range, pressure, and regulatory requirements for the industry (pharma, nuclear, etc.). For UNF/UN versions the design accommodates an Oâring; swapping to a different elastomer of the same dimensions is usually feasible if chemical and temperature compatibility and hardness are acceptable. Recommend consulting the manufacturerâs technical data or compatibility charts and validating with pressure/chemical resistance testing before use.

Can Hex plug with male thread, stainless steel 121H be ordered with metric or BSPP thread variants?

Hex plug with male thread, stainless steel 121H can be ordered with BSPP or metric threads. Description lists available external thread types as NPT, BSP, BSPT, UNF, and UN; BSP is included (BSPP is the parallel form of BSP commonly supplied for sealing with Oârings or flat faces). Although UNF and UN variants are specifically noted as supplied with an Oâring, the product material (AISI 316) and FKM 90 Oâring seal indicate compatibility with BSPP arrangements. If you require a metric thread variant not listed, request confirmation from the supplier. metric threads are not explicitly stated in the standard description, so availability may depend on manufacturer/custom options.

Hex plug with male thread, stainless steel 121H

All products, Precision threaded fasteners/

Additional information

Material	SS – stainless steel
Standard length [m]	10

Hexagonal plug with external thread NPT, BSP, BSPT, UNF, and UN, for threaded couplings primarily intended for the chemical, petrochemical, pharmaceutical, energy, nuclear power, and process engineering industries. The plug with UNF and UN thread is equipped with an O-ring seal. Material: AISI 316 steel. Seal: FKM 90 O-ring.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
HM-P121H-01-SS	Plug GZ 1/16" NPT (hexagonal), SS	-	759	In stock	Enquiry
HM-P121H-02-SS	Plug GZ 1/8" NPT (hexagonal), SS	-	690	In stock	Enquiry
HM-P121H-04-SS	Plug GZ 1/4" NPT (hexagonal), SS	-	552	In stock	Enquiry
HM-P121H-06-SS	Cap GZ 3/8" NPT (hexagonal), SS	-	538	In stock	Enquiry
HM-P121H-08-SS	Plug GZ 1/2" NPT (hexagonal), SS	-	531	In stock	Enquiry
HM-P121H-12-SS	Cap GZ 3/4" NPT (hexagonal), SS	-	503	In stock	Enquiry
HM-P121H-16-SS	Cap GZ 1" NPT (hexagonal), SS	-	366	In stock	Enquiry
HM-P121HG-02-SS	Plug GZ 1/8" BSP (hexagonal), SS	-	690	In stock	Enquiry
HM-P121HG-04-SS	Plug GZ 1/4" BSP (hexagonal), SS	-	552	In stock	Enquiry
HM-P121HG-08-SS	Plug GZ 1/2" BSP (hexagonal), SS	-	531	In stock	Enquiry
HM-P121HG-16-SS	Cap GZ 1" BSP (hexagonal), SS	-	366	In stock	Enquiry
HM-P121HOB-05-SS	GZ plug 5/16"-24 UN (hexagonal), o-ring (Boss), SS	-	537	In stock	Enquiry
HM-P121HOB-07-SS	Plug GZ 7/16"-20 UN (hexagonal), o-ring (Boss), SS	-	531	In stock	Enquiry
HM-P121HOB-09-SS	Plug GZ 9/16"-18 UN (hexagonal), o-ring (Boss), SS	-	503	In stock	Enquiry
HM-P121HOB-12-SS	Cap GZ 3/4"-16 UN (hexagonal), o-ring (Boss), SS	-	503	In stock	Enquiry
HM-P121HOB-14-SS	Plug GZ 7/8"-14 UN (hexagonal), o-ring (Boss), SS	-	365	In stock	Enquiry
HM-P121HOB-17-SS	Plug GZ 1.1/16"-12 UN (hexagonal), o-ring (Boss), SS	-	365	In stock	Enquiry
HM-P121HOB-21-SS	Cap GZ 1.5/16"-12 UN (hexagonal), o-ring (Boss), SS	-	269	In stock	Enquiry
HM-P121HR-02-SS	Plug GZ 1/8" BSPT (hexagonal), SS	-	690	In stock	Enquiry
HM-P121HR-04-SS	Plug GZ 1/4" BSPT (hexagonal), SS	-	552	In stock	Enquiry
HM-P121HR-06-SS	Cap GZ 3/8" BSPT (hexagonal), SS	-	538	In stock	Enquiry
HM-P121HR-08-SS	Plug GZ 1/2" BSPT (hexagonal), SS	-	531	In stock	Enquiry
HM-P121HR-12-SS	Cap GZ 3/4" BSPT (hexagonal), SS	-	503	In stock	Enquiry
HM-P121HR-16-SS	Cap GZ 1" BSPT (hexagonal), SS	-	366	In stock	Enquiry

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Hexagonal plug with external thread NPT, BSP, BSPT, UNF, and UN, for threaded couplings primarily intended for the chemical, petrochemical, pharmaceutical, energy, nuclear power, and process engineering industries. The plug with UNF and UN thread is equipped with an O-ring seal. Material: AISI 316 steel. Seal: FKM 90 O-ring.