Authorised Dealer

C-31-74 Cyl. base nut kit, hex

Fits: 36-84 Big Twin OEM: 16602-30
£26.88 SAVE £4.03 (15%)
£22.85

incl. VAT

Available to Order
Stock updated: today at 4:31 am
JOIN IRON STABLE — SAVE 15%

Chapter members save 15% · Sign in for member pricing

Estimated delivery: 3–15 working days

Part #: C-31-74

Authorised

Iron City Dealer

14-Day Returns

Easy & hassle-free

Secure Checkout

256-bit encryption

Free UK Delivery

On orders over £100

Specifications

Brand
Gardner-Westcott
Part Number
C-31-74
OEM Reference
16602-30
Pack Quantity
Each
Category
Cylinder Base Nut Kits
VAT Rate
20%

About This Product

When you're torquing down your top end, you want hardware you can trust, and this Gardner-Westcott cylinder base nut kit is up to the task. This kit features chrome-plated hex nuts that provide a clean, finished look to the base of your cylinders. It is a direct replacement for OEM 16602-30 and fits a massive range of Harley-Davidson history, covering 1936 to 1984 Big Twin models. Whether you're working on a Knucklehead, Panhead, or Shovelhead, these nuts offer the durability and precision threading required for a leak-free seal. The chrome finish is tough enough to handle a wrench without chipping, ensuring your engine looks professional for years to come.

Manufacturer part number: C-31-74.

Fitment

64 models

36-84 Big Twin

Electra Glide
18 models
Brand Year Model
Harley-Davidson 1978 Electra Glide FLH 80 FLH-80
Harley-Davidson 1975–1980 Electra Glide FLH-1200
Harley-Davidson 1979–1980 Electra Glide FLH-80
Harley-Davidson 1975 Electra Glide FLHF
Harley-Davidson 1977 Electra Glide FLHS-1200
Harley-Davidson 1980 Electra Glide FLHS-80
Harley-Davidson 1984 FLH Police 80 FLH
Harley-Davidson 1979–1980 Glide Classic FLHC-80
Harley-Davidson 1981–1984 Police Electra Glide FLH-1200
Harley-Davidson 1981–1984 Police Electra Glide FLH-80
Harley-Davidson 1983 Police FLH
Harley-Davidson 1979–1980 Police FLH-1200 FLH-1200
Harley-Davidson 1980 Touring Electra Glide Classic FHL-80
Harley-Davidson 1979 Touring Electra Glide Classic FLHC-80
Harley-Davidson 1980 Touring Electra Glide FL-80
Harley-Davidson 1978–1984 Touring Electra Glide FLH-80
Harley-Davidson 1977 Touring Electra Glide Sport FLHS-1200
Harley-Davidson 1980 Touring Electra Glide Sport FLHS-80
FXR
5 models
Brand Year Model
Harley-Davidson 1989–1990 FXR Convertible FXRS
Harley-Davidson 1982–1983 FXR Low Glide FXRS
Harley-Davidson 1987–1992 FXR Sport FXRS-SP
Harley-Davidson 1982–1983 FXR Super Glide FXR
Harley-Davidson 1983–1990 FXR Touring FXRT
FXR Police
1 model
Brand Year Model
Harley-Davidson 1984–1990 Police Low Rider FXRP
Low Rider
2 models
Brand Year Model
Harley-Davidson 1977–1979 FX Super Glide FXS-1200
Harley-Davidson 1979–1980 FX Super Glide FXS-80
Police
1 model
Brand Year Model
Harley-Davidson 1975 Glide Police FL
Police Electra Glide
1 model
Brand Year Model
Harley-Davidson 1979–1980 Police FLH 80 FLHP-80
Softail
7 models
Brand Year Model
Harley-Davidson 1983 Dyna Glide Glide Custom FXDG
Harley-Davidson 1983–1984 FX Low Rider FXSB
Harley-Davidson 1981 FX Super Glide Fat Bob FXEF
Harley-Davidson 1981–1984 FX Super Glide FXE
Harley-Davidson 1981–1982 FX Super Glide FXS
Harley-Davidson 1981–1984 FX Wide Glide FXWG
Harley-Davidson 1981–1982 Super Glide B80 FXB
Sportster
1 model
Brand Year Model
Harley-Davidson 1983–1984 Sportster XR-1000
Super Glide
6 models
Brand Year Model
Harley-Davidson 1979–1980 FX Super Glide Fat Bob FXEF-1200
Harley-Davidson 1979–1980 FX Super Glide Fat Bob FXEF-80
Harley-Davidson 1976–1980 FX Super Glide FXE-1200
Harley-Davidson 1983–1984 FX Super Glide FXS-80
Harley-Davidson 1976–1978 Super Glide 1200 FX-1200
Harley-Davidson 1980 Super Glide B80 FXB-80
Tour Glide
3 models
Brand Year Model
Harley-Davidson 1979–1980 Tour Glide FLT
Harley-Davidson 1980 Touring Tour Glide FLT
Harley-Davidson 1983 Touring Tour Glide FLTD
Touring
16 models
Brand Year Model
Harley-Davidson 1981–1983 Electra Glide FLH
Harley-Davidson 1981 Electra Glide FLHS
Harley-Davidson 1983–1984 Electra Glide FLHT
Harley-Davidson 1981 Glide Classic FLHC
Harley-Davidson 1983–1984 Glide Classic FLHT
Harley-Davidson 1981 Glide Classic FLTC
Harley-Davidson 1982–1984 Tour Glide Classic FLT
Harley-Davidson 1981–1984 Tour Glide FLT
Harley-Davidson 1981–1982 Touring Electra Glide Classic FLHC
Harley-Davidson 1983–1990 Touring Electra Glide Classic FLHTC
Harley-Davidson 1984 Touring Electra Glide FLH
Harley-Davidson 1981–1990 Touring Electra Glide Sport FLHS
Harley-Davidson 1983–1988 Touring Electra Glide Standard FLHT
Harley-Davidson 1980–1990 Touring Tour Glide Classic FLTC
Harley-Davidson 1989–1990 Touring Tour Glide Classic Ultra FLTCU
Harley-Davidson 1981–1983 Touring Tour Glide FLT
Wide Glide
1 model
Brand Year Model
Harley-Davidson 1980 FX Wide Glide FXWG-80
XR-750
1 model
Brand Year Model
Harley-Davidson 1976–1979 Sportster XR-750
74CI (1200CC) OHV Twin
1 model
Brand Year Model
Harley-Davidson 1978 Electra Glide FLH

Related Products

View all →

More from Gardner-Westcott

View all →

Who are we? Leeds Harley-Davidson - Iron City Motorcycles

Who are we? Leeds Harley-Davidson - Iron City Motorcycles

This product is fulfilled by Iron City Motorcycles, Leeds' authorised Harley-Davidson® dealer, serving the UK with a full range of Genuine Motorclothes®, dealer merchandise, and official Harley-Davidson parts & accessories — available for UK and international delivery.

From OEM Parts to retro lifestyle wear to aftermarket stockits we have what you need to keep you riding all year round.

Use our official OEM parts finder to browse our full Genuine Harley-Davidson® Parts and our associated approved aftermarket catalogues.

Free UK Delivery

On orders over £100

14-Day Returns

Easy & hassle-free

Authorised Dealer

Iron City Motorcycles

Secure Payment

256-bit encryption

It looks like you're in Europe

Would you like to view prices in €?